Title of Invention

A METHOD OF CONTROLLING AN ELECTRIC KETTLE

Abstract

A controlling method comprises the following steps: (1) detecting a temperature inside the electric kettle and determining a system preset value by a microprocessor after a power-up and initialization process; (2) detecting an ON/OFF state of a heating circuit; (3) detecting whether a process of temperature maintenance is performed; (4) performing a detection and control process of dry boiling protection; (5) detecting whether there is a request for heating or temperature maintenance; and (6) sending a "heating" or "temperature maintenance" signal to a control circuit, and then performing a control process of heating or temperature maintenance.

Full Text

FIELD OF THE INVENTION This invention relates to a method for controlling electric kettles. BACKGROUND OF THE INVENTION Electric kettles are convenient for human in living and working. However, a simple process applied for conventional kettles in controlling a water-boiling, temperature maintenance, and a dry boiling prevention renders the control is not accurate. SUMMARY OF THE INVENTION The purpose of this invention is to provide a method of controlling electric kettles, and the technical problem to be solved by the invention is to associate each of controlling processes so as to control the working process of the electric kettles accurately. According to the present invention, there is provided a method of controlling an electric kettle comprising the following steps: (1) detecting a temperature inside the electric kettle and determining a system preset value by a microprocessor after a power-up and initialization process; (2) detecting an ON/OFF state of a heating circuit; (3) detecting whether a process of temperature maintenance is performed; (4) performing a detection and control process of dry boiling protection; (5) detecting whether there is a request for heating or temperature maintenance; and (6) sending a "heating" or "temperature maintenance" signal to a control circuit, and then performing a control process of heating or temperature maintenance. After the process of heating or temperature maintenance is finished, the routine returns to an initialization state. The step of detecting the temperature inside the kettle by the microprocessor according to the invention is preformed by detecting a temperature at two points inside the kettle five times per second, and calculating an average temperature of the two points within one second. The system preset value is a value preset selected form calculation cycles, maximum heating periods, and a status parameter of whether the temperature maintenance process should be preformed after the water boils. The system preset value may be a group of set values obtained according to the volume and heating power of the electric kettle. When the microprocessor in the present invention detects the ON/OFF state of the heating circuit, the period of continuous heating is timed when the heating power supply is ON, and the stored heating period is reset to zero when the heating power supply is OFF. The microprocessor in the present invention detects whether the process of temperature maintenance is performed. When the heating circuit is in the state of the temperature maintenance, the microprocessor compares the average temperature with a preset lower limit temperature value of the temperature maintenance state. If the average temperature is higher, the microprocessor times the heating period of the temperature maintenance and then detects whether temperature-sensing components at the two measuring points work normally, and on the contrary, it directly detects whether the temperature-sensing components at the two points work normally. When the heating circuit is not in the state of the temperature maintenance, the microprocessor detects whether the temperature-sensing components at the two measuring points work normally. If the temperature-sensing components work abnormally, the microprocessor sends out an alert and switches off the heating power supply, and on the contrary, it enters the detection and control process of dry boiling protection. In detecting whether there is a request for heating or for temperature maintenance, the microprocessor according to the present invention detects whether there is a request for heating at first. If the request for heating is detected, the microprocessor sends a "heating" signal to the control circuit and controls the heating of the water inside the electric kettle. When the water boils, the microprocessor sends out a "stopping heating" signal. In detecting whether there is a request for heating, if no request for heating is detected, the microprocessor according to the present invention detects whether there is a request for temperature maintenance. If no request for temperature maintenance is detected, the routine returns to the initialization state. On the contrary, if the request for temperature maintenance is detected, the microprocessor detects whether there is a request of "the temperature maintenance process should be preformed after the water boils". In detecting whether there is a request of "the temperature maintenance process should be preformed after the water boils", if the request is detected, the microprocessor according to the present invention sends a "heating" signal to the control circuit and controls the heating of the water inside the electric kettle, and then performs a control process of temperature maintenance after the water boils. On the contrary, if no request is detected, the microprocessor sends a "heating for temperature maintenance" signal to the control circuit and performs the control process of temperature maintenance. In performing the detection and control process of dry boiling protection, the microprocessor according to the present invention calculates a rate of change of the temperature according to the average temperature, and compares the rate with its preset value. If the rate of change of the temperature is higher than the preset value, the microprocessor sends a "stopping heating" signal to the control circuit and sends out an alert. On the contrary, if the rate of change of the temperature is lower than its preset value, the microprocessor calculates an acceleration of change of the temperature, i.e., the rate of the temperature variation changing with time, and compares it with its preset value. If the acceleration is higher than its preset value, the microprocessor sends a "stopping heating" signal to the control circuit and sends out an alert. In addition, the microprocessor sends a "stopping heating" signal to the control circuit and sends out an alert if the continuous heating period is longer than the preset maximum heating period. In performing the control process of heating, the microprocessor calculates the rate of change of the temperature and compares it with that of a cycle ahead of the present cycle. If the rate of change of the temperature decreases and reaches a minimum value, the microprocessor sends a "stopping heating" signal to the control circuit. In performing the control process of temperature maintenance, the microprocessor sends a "heating" signal to the control circuit if the average temperature of the water is lower than a preset lower limit to drink, and if the average temperature of the water is higher than or equal to a preset upper limit to drink, the microprocessor sends a "stopping heating" signal to the control circuit. After sending the "heating" signal to the control circuit, the microprocessor compares the actual temperature of the water with a preset temperature. If the actual temperature of the water is higher than the preset temperature, the microprocessor sends a "stopping heating" signal to the control circuit. On the contrary, if the actual temperature of the water is lower than the preset temperature, the microprocessor calculates the rate of change of the temperature, and compares it with a preset rate of change of the temperature. If the calculated rate is higher than the preset rate, the microprocessor sends a "stopping heating" signal to the control circuit, and on the contrary, sends a "stopping heating after a delay time" signal to the control circuit. Compared with the prior art, the present invention adopts a microprocessor to associate the process of detecting the temperature inside the electric kettle, the process of determining a system preset value, the process of detecting the ON/OFF state of the heating circuit, the process of detecting whether a process of temperature maintenance is performed, the process of performing a detection and control process of dry boiling protection, the process of heating, and the process of temperature maintenance together in a system. With the continuous refreshment of the microprocessor, the present invention realizes the accurate control of each of the working processes of the electric kettle, which is convenient for use. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS Figure 1 is a first flowchart exemplarily showing a method for controlling an electric kettle according to the present invention. Figure 2-1 is a second flowchart exemplarily showing the method for controlling the electric kettle according to the present invention. Figure 2-2 is a continuing chart of figure 2-1. Figure 3 is a flowchart exemplarily showing a process of dry boiling prevention of the method for controlling the electric kettle according to the present invention. Figure 4-1 is a flowchart exemplarily showing a process of temperature maintenance of the method for controlling the electric kettle according to the present invention. Figure 4-2 is a continuing chart of figure 4-1. DESCRIPTION OF THE PREFERRED EMBODIMENTS The objects, features and advantages of the invention will be more readily apparent from the following detailed description with reference to the accompanying drawings. As shown in Figure 1, a controlling method of an electric kettle according to the present invention comprises the following steps: (1) arranging temperature sensors, a microprocessor and a control circuit inside the electric kettle; (2) detecting a real-time temperature of water inside the electric kettle by the temperature sensors after a power-up and initialization process, and then transmitting the detected signal to the microprocessor; (3) determining a system preset value by the microprocessor; (4) detecting an ON/OFF state of a heating circuit, and timing a period of continuous heating; (5) detecting whether a process of temperature maintenance is performed, counting cycles of the heating for the temperature maintenance and timing a heating period for the temperature maintenance by the microprocessor; (6) detecting whether the temperature sensors at measuring points work normally; (7) performing a detection and control process of dry boiling protection; (8) detecting whether there is a request for heating or temperature maintenance; (9) sending a "heating" or "temperature maintenance" signal to the control circuit, and then performing a control process of heating or temperature maintenance; (10) returning to the initialization stage after the process of heating or temperature maintenance is finished. As shown in Figure 2-1 and Figure 2-2, after the power-up and initialization process, based on the temperature values detected by the temperature sensors five times per second at two measuring points (the center and edge of the electric kettle's underpan) inside the electric kettle, the microprocessor calculates the average temperature of these two points within one second. A set of inquiry codes, which represent ten groups of calculation cycles, ten groups of maximum heating periods and a status parameter of whether the temperature maintenance process should be preformed after the water boils, is preset in the microprocessor. Electric kettles with various volumes and heating power have their respective calculation cycles and maximum heating periods. With a conversion performed through an A/D conversion input interface of the microprocessor, the inquiry codes will be obtained. According to the inquiry codes, the microprocessor determines the preset calculation cycle and maximum heating period that adapt to the volume and heating power of the present electric kettle, and determines whether or not the temperature maintenance process should be preformed after the water boils. Afterwards, the microprocessor detects the ON/OFF state of the heating circuit, i.e., whether a relay of the heating circuit is closed. When a heating power supply of the heating circuit is ON, the microprocessor times the period of continuous heating; and when the heating power supply is OFF, the microprocessor resets the stored heating period to zero. The microprocessor detects whether the process of temperature maintenance is performed, i.e., whether the circuit is in the state of the temperature maintenance. When the heating circuit is in the state of the temperature maintenance, the microprocessor compares the average temperature with a preset lower limit temperature value of the temperature maintenance state. If the average temperature is higher than the lower limit temperature value, the microprocessor times the heating period for the temperature maintenance, and then detects whether the temperature-sensing components, which sense the temperature of the two measuring points, work normally. On the contrary, if the average temperature is lower than the lower limit temperature value, the microprocessor detects whether the temperature-sensing components work normally. When the heating circuit is not in the state of temperature maintenance, the microprocessor detects whether the temperature-sensing components work normally. In addition, the microprocessor counts a cycle of the rate of change of the temperature, and detects whether the temperature-sensing components work normally. If the temperature-sensing components work abnormally, the microprocessor sends out an alert and switches off the heating power supply. If the temperature-sensing components work normally, the routine proceeds to the detection and control process of dry boiling protection. Subsequently, the microprocessor firstly detects whether there is a request for heating. If there is, the microprocessor sends a "heating" signal to the control circuit, and enters a control process of boiling the water, i.e., controls the process of heating the water inside the electric kettle. If there is no request for heating, the microprocessor detects whether there is a request for temperature maintenance. If there is not, the routine returns to the initialization state. If there is a request for temperature maintenance, the microprocessor further detects whether there is a request for temperature maintenance after the water boils. If there is, the microprocessor sends a "heating" signal to the control circuit, and then enters the control process of boiling the water. After the water boils, the routine proceeds to the temperature maintenance control process. If there is no request for temperature maintenance after the water boils, the microprocessor sends a "heating for temperature maintenance" signal to the control circuit, and enters the temperature maintenance control process, i.e., controls the process of temperature maintenance. When performing the heating control process to boil the water, the microprocessor calculates the rate of change of the temperature, and compares the rate with that of a cycle ahead of the present cycle. If the rate of change of the temperature decreases and reaches a minimum value, the microprocessor sends a "stopping heating" signal to the control circuit, and returns to the state of the initialization after the heating control process of boiling the water is finished. As shown in Figure 3, when the microprocessor is performing the detection and control process of dry boiling protection, the control circuit switches on the heating power supply. When the continuous heating period is longer than or equal to the preset maximum heating period, the microprocessor switches off the heating power supply, and sends out an alert. On the other hand, when the continuous heating period is shorter than the preset maximum heating period, the current temperature will be detected and compared with a preset maximum temperature. If the temperature is higher than the preset maximum temperature, the microprocessor switches off the heating power supply and sends out an alert. On the contrary, if the temperature is lower than the preset maximum temperature, the microprocessor calculates the rate of change of the temperature and compares the rate with its preset value. If the rate of change of the temperature is higher than its preset value, the microprocessor switches off the heating power supply and sends out an alert. If, on the other hand, the rate of change of the temperature is lower than its preset value, the microprocessor calculates an acceleration of change of the temperature, i.e., the rate of the temperature variation changing with time. If the acceleration is higher than its preset value, the microprocessor switches off the heating power supply and sends out an alert. On the contrary, the microprocessor records the current rate of change of the temperature. As shown in Figure 4-1 and Figure 4-2, when performing the temperature maintenance control process, the microprocessor firstly detects whether the current stage is the heating for temperature maintenance. If it is not, the microprocessor detects whether the water temperature is higher than the preset value of the temperature maintenance. If the water temperature is lower than the preset value, the microprocessor sends a "heating" signal to the control circuit, and switches on the power supply for heating. The microprocessor compares the actual temperature of the water with preset temperature levels. Firstly, the actual temperature of the water is compared with a preset lowest temperature level, if the actual temperature of the water is higher, it will be compared with a preset higher temperature levels till a preset highest temperature level. If the actual temperature of the water is still higher than the preset highest temperature level, the microprocessor sends a "stopping heating" signal to the control circuit. The preset water temperatures are divided into five levels, the values of which increase from the first level up to the fifth. When the actual temperature of the water is lower than the current preset temperature level, the microprocessor calculates the current rate of change of the temperature, adds it with a preset regulation value of current level, and stores the sum. The preset regulation values are divided into four levels, which increase from the first level up to the fourth. The stored value, i.e., the sum is compared with a highest regulation comparative value. If the stored value is lower than the highest regulation comparative value level, it will be compared with lower regulation comparative value levels till a lowest regulation comparative value level. The preset regulation comparative values are divided into six levels, which decrease from the sixth level down to the first. If the stored value is higher than the regulation comparative value, a preset heating period corresponding to the regulation comparative value of current level is selected. The preset heating periods are divided into seven levels, the length of which increases from zero to the seventh level. If the actual temperature of the water is lower than the first preset temperature level, a value stored in storage is zero. If the actual temperature of the water is lower than the second preset temperature level, the microprocessor calculates the current rate of change of the temperature, adds it with the first preset regulation value level, and stores the sum. If the actual temperature of the water is lower than the third preset temperature level, the microprocessor calculates the current rate of change of the temperature, adds it with the second preset regulation value level, and stores the sum. If the actual temperature of the water is lower than the fourth preset temperature level, the microprocessor calculates the rate of change of the temperature, adds it with the third preset regulation value level, and stores the sum. If the actual temperature of the water is lower than the fifth preset temperature level, the microprocessor calculates the current rate of change of the temperature, adds it with the fourth preset regulation value level, and stores the sum. If the stored value, i.e., the sum is higher than the sixth regulation comparative value level, the heating period is set to zero. If the stored value is higher than the fifth regulation comparative value level, the heating period is set to the first preset heating period level. If the stored value is higher than the fourth regulation comparative value level, the heating period is set to the second preset heating period level. If the stored value is higher than the third regulation comparative value level, the heating period is set to the third preset heating period level. If the stored value is higher than the second regulation comparative value level, the heating period is set to the fourth preset heating period level. If the stored value is higher than the first regulation comparative value level, the heating period is set to the fifth preset heating period level. If the stored value is lower than the first regulation comparative value level, the heating period is set to the sixth preset heating period level. The purpose of presetting the temperature limits into different levels is to add the rate of change of the temperature with different regulation values, so as to compare with the regulation comparative value of the same level. An alternative method is comparing the actual temperature of the water with the preset temperature. If the actual temperature of the water is lower than the preset temperature, the microprocessor calculates the rate of change of the temperature and compares it with the preset rate of change of the temperature. On the contrary, if the actual temperature of the water is higher than the preset temperature, the microprocessor sends a "stopping heating" signal to the control circuit. If the calculated rate of change of the temperature is lower than the preset rate of change of the temperature, the microprocessor sends a "stopping heating after a delay time" signal to the control circuit. According to the temperatures of different levels, different preset regulation values are selected, so as to obtain different preset heating periods. The higher the temperature, the larger the preset regulation value and the shorter the preset heating period, which illustrates the negative relationship between the heating period for the temperature maintenance and the temperature. The maximum heating period within the current calculation cycle is preset in the microprocessor. If the heating period is higher than or equal to the preset maximum heating period, the microprocessor sends a "stopping heating within one cycle" signal to the control circuit, and detects whether one cycle is completed. On the contrary, if the heating period is lower than the preset maximum heating period, the heating process continues and the microprocessor detects whether one cycle is completed. If it is, the microprocessor calculates the rate of change of the temperature, stores the current temperature of the water, and compares the current temperature of the water with the first preset temperature level after resetting the heating period to zero. If one cycle is not completed, the microprocessor compares the current temperature of the water with the fifth preset temperature level. If the current temperature of the water is higher, the microprocessor sends a "stopping heating" signal to the control circuit. On the contrary, the microprocessor continues comparing the heating period within the cycle with the preset heating period. After the temperature maintenance control process is finished, the routine returns to the initialization state. WE CLAIM : 1. A method of controlling an electric kettle, comprising the following steps: a) detecting a temperature inside the electric kettle and determining a system preset value by a microprocessor after a power-up and initialization process; b) detecting an ON/OFF state of a heating circuit; c) determining a temperature maintenance state; d) performing a detection and control process of dry boiling protection; e) detecting whether there is a request for heating or temperature maintenance; and f) sending a "heating" or "temperature maintenance" signal to a control circuit, and then performing a control process of heating or temperature maintenance. 2. The method according to claim 1, wherein the routine returns to the initialization state after the process of heating or temperature maintenance is finished. 3. The method according to claim 2, wherein the step of detecting the temperature inside the electric kettle by the microprocessor includes: detecting a temperature five times per second at two measuring points inside the electric kettle, and calculating an average temperature of the two measuring points within one second. 4. The method according to claim 3, wherein the system preset value is a value preset selected from a calculation cycle, a maximum heating period, and a status parameter of whether the temperature maintenance process should be preformed after the water boils, which can be a group of set values obtained from the calculation cycle, the maximum heating period, and the status parameter according to the volume and heating power of the electric kettle. 5. The method according to claim 4, wherein in said detecting an ON/OFF state of a heating circuit, a period of continuous heating is timed when a heating power supply is ON; and a stored heating period is reset to zero when the heating power supply is OFF. 6. The method according to claim 5, wherein the step of detecting whether the process of temperature maintenance is performed comprising: comparing an average temperature with a preset lower limit temperature value of the temperature maintenance state when the heating circuit is in the state of the temperature maintenance, wherein the microprocessor times the heating period of the temperature maintenance and then detects whether temperature-sensing components at two measuring points work normally when the average temperature exceeds the lower limit temperature value, and, on the other hand, detects whether the temperature-sensing components at the two points work normally when the average temperature is lower than the lower limit temperature value; and detecting whether the temperature-sensing components work normally when the heating circuit is not in the state of the temperature maintenance, wherein the microprocessor sends out an alert and switches off the heating power supply when the temperature-sensing components work abnormally, and, on the other hand, enters the detection and control process of dry boiling protection when the temperature-sensing components work normally. 7. The method according to claim 6, wherein the step of detecting whether there is a request for heating or temperature maintenance includes: detecting whether there is a request for heating at first; and sending a "heating" signal to the control circuit and controlling the heating of the water inside the electric kettle when the request for heating is detected, and sending out a "stopping heating" signal when the water boils. 8. The method according to claim 7, comprising: detecting whether there is a request for temperature maintenance if no request for heating is detected; and returning to the initialization state when no request for temperature maintenance is detected, and, on the other hand, detecting whether there is a request of "the temperature maintenance process should be preformed after the water boils" if the request for temperature maintenance is detected. 9. The method according to claim 8, comprising: sending a "heating" signal to the control circuit and controlling the heating of the water inside the electric kettle if the request of "the temperature maintenance process should be preformed after the water boils" is detected, and then performing a control process of temperature maintenance after the water boils; and sending a "heating for temperature maintenance" signal to the control circuit and performing the control process of temperature maintenance if no request of the temperature maintenance process should be preformed after the water boils" is detected. 10. The method according to claim 9, wherein the step of performing the detection and control process of dry boiling protection comprising: calculating a rate of change of the temperature according to the average temperature and comparing the rate with its preset value, sending a "stopping heating" signal to the control circuit and sending out an alert if the rate of change of the temperature is higher than its preset value, and, on the other hand, calculating an acceleration of change of the temperature if the rate of change of the temperature is lower than its preset value, sending a "stopping heating" signal to the control circuit and sending out an alert if the acceleration is higher than its preset value, and sending a "stopping heating" signal to the control circuit and sending out an alert when a continuous heating period is longer than a preset maximum heating period; the step of performing the control process of heating comprising: calculating the rate of change of the temperature, and comparing the rate with that of a cycle ahead of the present cycle, and sending a "stopping heating" signal to the control circuit when the rate of change of the temperature decreases and reaches a minimum value; and the step of performing the control process of temperature maintenance comprising: sending a "heating" signal to the control circuit when the average temperature of the water is lower than a preset lower limit to drink, and, on the other hand, sending a "stopping heating" signal to the control circuit when the average temperature of the water is higher than or equal to a preset upper limit to drink, comparing the actual temperature of the water with a preset temperature after the microprocessor sends the "heating" signal to the control circuit, sending a "stopping heating" signal to the control circuit if the actual temperature of the water is higher than the preset temperature, calculating the rate of change of the temperature and comparing it with a preset rate of change of the temperature if the actual temperature of the water is lower than the preset temperature of the water, and sending a "stopping heating" signal to the control circuit if the calculated rate of change of the temperature is higher than the preset rate of change of the temperature, and, on the other hand, sending a "stopping heating after a delay time" signal to the control circuit if the calculated rate of change of the temperature is lower than the preset rate of change of the temperature. ABSTRACT A METHOD OF CONTROLLING AN ELECTRIC KETTLE A controlling method comprises the following steps: (1) detecting a temperature inside the electric kettle and determining a system preset value by a microprocessor after a power-up and initialization process; (2) detecting an ON/OFF state of a heating circuit; (3) detecting whether a process of temperature maintenance is performed; (4) performing a detection and control process of dry boiling protection; (5) detecting whether there is a request for heating or temperature maintenance; and (6) sending a "heating" or "temperature maintenance" signal to a control circuit, and then performing a control process of heating or temperature maintenance.

Documents:

01637-kolnp-2008-abstract.pdf

01637-kolnp-2008-claims.pdf

01637-kolnp-2008-correspondence others.pdf

01637-kolnp-2008-description complete.pdf

01637-kolnp-2008-drawings.pdf

01637-kolnp-2008-form 1.pdf

01637-kolnp-2008-form 2.pdf

01637-kolnp-2008-form 3.pdf

01637-kolnp-2008-form 5.pdf

01637-kolnp-2008-gpa.pdf

01637-kolnp-2008-international publication.pdf

1637-KOLNP-2008-(01-11-2012)-CORRESPONDENCE.pdf

1637-KOLNP-2008-(05-08-2013)-CORRESPONDENCE.pdf

1637-KOLNP-2008-(06-12-2012)-ANNEXURE TO FORM 3.pdf

1637-KOLNP-2008-(06-12-2012)-CORRESPONDENCE.pdf

1637-KOLNP-2008-(06-12-2012)-OTHERS.pdf

1637-KOLNP-2008-(21-12-2012)-CORRESPONDENCE.pdf

1637-KOLNP-2008-(21-12-2012)-OTHERS.pdf

1637-KOLNP-2008-(29-11-2012)-ABSTRACT.pdf

1637-KOLNP-2008-(29-11-2012)-AMANDED PAGES OF SPECIFICATION.pdf

1637-KOLNP-2008-(29-11-2012)-CLAIMS.pdf

1637-KOLNP-2008-(29-11-2012)-CORRESPONDENCE.pdf

1637-KOLNP-2008-(29-11-2012)-DRAWINGS.pdf

1637-KOLNP-2008-(29-11-2012)-FORM-1.pdf

1637-KOLNP-2008-(29-11-2012)-FORM-2.pdf

1637-KOLNP-2008-CORRESPONDENCE 1.1.pdf

1637-KOLNP-2008-CORRESPONDENCE.pdf

1637-KOLNP-2008-EXAMINATION REPORT.pdf

1637-kolnp-2008-form 18.pdf

1637-KOLNP-2008-GRANTED-ABSTRACT.pdf

1637-KOLNP-2008-GRANTED-CLAIMS.pdf

1637-KOLNP-2008-GRANTED-DESCRIPTION (COMPLETE).pdf

1637-KOLNP-2008-GRANTED-DRAWINGS.pdf

1637-KOLNP-2008-GRANTED-FORM 1.pdf

1637-KOLNP-2008-GRANTED-FORM 2.pdf

1637-KOLNP-2008-GRANTED-FORM 3.pdf

1637-KOLNP-2008-GRANTED-FORM 5.pdf

1637-KOLNP-2008-GRANTED-SPECIFICATION-COMPLETE.pdf

1637-KOLNP-2008-INTERNATIONAL PUBLICATION.pdf

1637-KOLNP-2008-INTERNATIONAL SEARCH REPORT & OTHERS.pdf

1637-KOLNP-2008-PA.pdf

1637-KOLNP-2008-REPLY TO EXAMINATION REPORT-1.1.pdf

1637-KOLNP-2008-REPLY TO EXAMINATION REPORT.pdf

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