Title of Invention

"A TURBOCHARGING SYSTEM"

Abstract

The present invention relates to a structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end, said shaft having an opening therethrough from said first end to said second end, said shaft being configured so that an air compressor can be mounted on said first end of said shaft and an exhaust gas turbine can be mounted on said second end of said shaft to rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft and a stator fixed in said housing; means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone; and means for passing fluid through said opening through said shaft even when said shaft is not rotating to remove heat from said rotor of said motor.

Full Text

The present invention relates to a turbo-charging system with integral assisting electric motor. FIELD OF THE INVENTION This invention is directed to internal combustion engine exhaust gas-driven turbochargers and particularly to the use of an integral electric motor to boost output at low exhaust gas volume . BACKGROUND OF THE INVENTION In order to increase the power output of an internal combustion engine of a particular displacement volume, additional air can be supplied by compressing the air by means of a turbocharger. Additional air permits the burning of more fuel to produce increased power output. At very low engine speed such as, for example, at low idle, there is insufficient exhaust gas energy to drive the turbocharger fast enough to produce significant levels of boost. Consequently, there is an appreciable lag time between opening of the engine throttle and when the turbocharger is running fast enough to produce enough boost pressure to eliminate smoke on acceleration. Fuel control devices, such as rack limiters or aneroid controls, are employed to limit the amount of fuel delivered to the engine cylinders until the turbocharger is capable of delivering sufficient air to produce smoke-free combustion. These fuel limiting devices cause slower response to throttle opening and a sluggishness in engine and vehicle response. There is need for boosting the output of an exhaust gas-driven turbocharger during those times when an increase in engine output power is required. SUMMARY OF THE INVENTION In order to aid in understanding this invention, it can be stated in essentially summary form that it is directed to an exhaust gas-driven turbocharger which has an integral electric motor to maintain compressor speed at low exhaust gas flow rates in order to supply sufficient engine air to eliminate uncombusted hydrocarbons and exhaust smoke and to boost power early in the acceleration mode. The invention includes structure to limit the upper temperatures of the motor and to limit heat flow to the motor. It is an aspect of this invention to supply power to a turbocharger which is driven by exhaust gas expansion by including an integrated motor to supply torque to aid in rotating the shaft in the same direction as exhaust gas expansion. It is a further aspect of this invention to provide an exhaust gas-driven turbocharger with an internal electric motor with provisions to cool the motor so as to limit motor temperature during and after operation. It is a further aspect this invention to provide thermal insulation between the exhaust gas turbine and the electric motor to limit heat flow from the exhaust gas turbine to the electric motor both during operation and subsequent to operation. It is another aspect of this invention to provide an exhaust gas-driven compressor with air flow in a direction from the internal motor to the exhaust gas turbine to remove heat from the structure around the electric motor. The features of the present 'invention which are believed to be novel are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages thereof, may be best understood by reference to the following description, taken in conjunction with the accompanying drawings. Accordingly, the present invention relates to a structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end, said shaft having an opening therethrough from said first end to said second end, said shaft being configured so that an air compressor can be mounted on said first end of said shaft and an exhaust.gas turbine can be mounted on said second end of said shaft to rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft and a stator fixed in said housing; means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone; and means for passing fluid through said opening through said shaft even when said shaft is not rotating to remove heat from said rotor of said motor. Accordingly, there is also provided that a turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing, said shaft having an opening therethrough from said first end to said second end; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings and having a stator within said housing; means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed, said lubricant fluid passages being positioned with respect to said stator to cool said stator; and means for passing fluid through said opening through said shaft even when said shaft is not rotating to remove heat from said rotor of said motor. BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a longitudinal section through the gas driven turbocharger, and through the bearing and motor housing, showing the internal electric motor positioned between the bearings in the bearing housing. FIGURE 2 is an enlarged transverse section taken generally along line 2-2 of FIGURE 1. FIGURE 3 is an enlarged detail of the motor and its surrounding structure. DESCRIPTION OF THE PREFERRED EMBODIMENT The turbo-charging system of this invention is generally indicated at 10 in FIGURE 1. The gas turbine 12 and the air charging compressor 14 are mostly shown in a longitudinal section on the center line of their connecting shaft 16. The gas turbine has an inlet scroll 18 which is connected to receive the exhaust gas from an internal combustion engine, such as a diesel engine. Impeller 20 is mounted on shaft 16 and expands the exhaust gas. The waste exhaust gas is exhausted out of exhaust pipe 22. The impeller 20 imparts torgue to the shaft 16 and rotates the shaft. At the other end of the shaft, air intake 24 receives air from the outside after passing through an air filter or the like, which removes the'larger physical contaminants. The air intake 24 is part of the turbocharger, which includes scroll 26. Compressor impeller 28 is mounted on shaft 16 and rotates therewith. The rotation of the compressor impeller compresses the intake air which is delivered by the scroll, sometimes through an inter-cooling heat exchanger, to the internal combustion engine. A bearing and motor housing, indicated generally at 30, is a divided housing, as seen in FIGURE 2, for ease of assembly of the internal parts. However, housing 30 is shown in section in FIGURE 1 for clarity of illustration. Bearing 32 and bearing 34 embrace the shaft 16 substantially at the ends of the bearing housing 30. It is desirable that the bearings be spaced as far apart as possible to provide shaft stability. In addition to supporting the bearings, both the compressor scroll 26 and. WE CLAIM; 1. A structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end, said shaft having an opening therethrough from said first end to said second end, said shaft being configured so that an air compressor can be mounted on said first end of said shaft and an exhaust gas turbine can be mounted on said second end of said shaft to rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft and a stator fixed in said housing; means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone; and means for passing fluid through said opening through said shaft even when said shaft is not rotating to remove heat from said rotor of said motor. 2. The structure as claimed in claim 1 wherein said housing has fluid passages therein adjacent said stator to cool said stator. 3. The structure as claimed in claim 2 wherein said passages are oil passages and said oil passages are also connected to lubricate said bearings. 4. The structure as claimed in claim 1 wherein said motor rotor is mounted on said shaft and including thermal insulation between said rotor and said shaft. 5. The structure as claimed in claim 4 wherein said motor rotor comprises a plurality of magnets, each shaped substantially as a longitudinal segment of a cylindrical tube. 6. The structure as claimed in claim 5 wherein a collar is mounted on said shaft adjacent each end of said rotor magnets, said collar embracing said rotor magnets to hold them on said shaft. 7. The structure as claimed in claim 6 further including a collar around said magnets substantially at the center thereof. 8. The structure as claimed in claim 1 wherein there is a gas turbine rotor mounted on said second end of said shaft and further including thermal insulation positioned between said gas turbine rotor and said second end of said shaft to inhibit heat transfer from said gas turbine rotor into said shaft. 9. The structure as claimed in claim 8 wherein said means for passing fluid through said opening comprises an air pump so that air can be supplied through said shaft even when said shaft is not rotating. 10. The structure as claimed in claim 1 wherein said opening through said shaft from said first end to said second end thereof is an air passage and there is means for supplying air through said air opening to reduce the amount of heat conducted from said second end of said shaft to said rotor. 11. The structure as claimed in claim 10 wherein said means for supplying air through said air passage is an air jet adjacent one end of said opening through said shaft. 12. A structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end so that an air compressor can be mounted on said first end of said shaft and an exhaust gas turbine can be mounted on said second end of said shaft to rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft and a stator fixed in said housing, oil passages in said housing adjacent said stator to cool said stator, said oil passages also being connected to lubricate said bearings, separating means between said rotor and said bearings to inhibit bearing oil from passing to said rotor; and means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone. 13. The structure as claimed in claim 12 wherein said separating means comprises an oil slinger mounted on said shaft. 14. The structure as claimed in claim 12 wherein said separating means comprises a seal interconnecting said shaft and said housing. 15. The structure as claimed in claim 14 wherein said separating means also includes an oil slinger mounted on said shaft to rotate with said shaft. 16. A structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end so that an air compressor can be mounted on said first end of said shaft and an exhaust gas turbine can be mounted on said second end of said shaft to. rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft, said motor rotor comprising a plurality of magnets, each of said plurality of magnets shaped substantially as a longitudinal segment of a cylindrical tube, thermal insulation between said magnets and said shaft, a collar mounted on said shaft adjacent each end of said rotor magnet, said collars embracing said rotor magnets to hold them on said shaft, said collar at each end of said shaft also carrying a seal thereon, each said seal cooperating with said housing to inhibit fluid escape from said housing adjacent said seal, a stator fixed in said housing; means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone. 17. A structure for an internal combustion engine turbo-charging system comprising: a housing, said housing having first and second spaced bearings therein, a shaft extending through said housing and through said bearings from a first end to a second end so that an air compressor can be mounted on said first end of said shaft and an exhaust gas turbine can be mounted on said second end of said shaft to rotatably drive said shaft in said bearings; an electric motor mounted in said housing between said bearings, said electric motor having a rotor mounted on said shaft, said motor stator comprising a plurality of magnets, each of said magnets being shaped substantially as a longitudinal segment of a cylindrical tube,a collar mounted on said shaft adjacent each end of said rotor magnets, said collar embracing said rotor magnets to hold them on said shaft, each of said collars carrying an oil slinger thereon, a stator fixed in said housing; means for energizing said electric motor for maintaining rotation of said shaft at a preselected minimum speed, even though insufficient exhaust gas is supplied to the turbine to maintain such preselected minimum speed, such minimum speed being preselected to provide charge air to an engine over and above that amount of charge air which could be provided by the exhaust gas turbine alone. 18. A turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing, said shaft having an opening therethrough from said first end to said second end; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings and having a stator within said housing; means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed, said lubricant fluid passages being.positioned with respect to said stator to cool said stator; and means for passing fluid through said opening through said shaft even when said shaft is not rotating to remove heat from said rotor of said motor. 19. The turbo-charging system as claimed in claim 18 wherein said means for maintaining a selected minimum rotational speed is for providing enough charge air to an engine to significantly reduce uncombusted hydrocarbons and exhaust smoke. 20. The turbo-charging system as claimed in claim 18 wherein said lubricant passages include an annulus around said stator. 21. The turbo-charging system as claimed in claim 18 wherein said rotor comprises a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube. 22. The turbo-charging system as claimed in claim 21 wherein there is a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft. 23. The turbo-charging system as claimed in claim 22 wherein there is a further collar around said magnets adjacent the center thereof. 24. The turbo-charging S3^stem as claimed in claim 21 wherein there is thermal insulation positioned between said magnets and said shaft to inhibit heat in said shaft from passing to said magnets. 25. The turbo-charging system as claimed in claim 18 wherein there is a gas turbine rotor mounted on said second end of said shaft with thermal insulation between said gas turbine rotor and said shaft to inhibit heat transfer from said rotor to said motor. 26. The turbo-charging system as claimed in claim 25 wherein said rotor comprises a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube. 27. The turbo-charging system as claimed in claim 26 wherein there is a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft. 28. The turbo-charging system as claimed in claim 27 wherein there is a further collar around said magnets adjacent the center thereof. 29. The turbo-charging system as claimed in claim 26 wherein there is thermal insulation positioned between said magnets and said shaft to inhibit heat in said shaft from passing to said magnets. 30. The turbo-charging system as claimed in claim 18 wherein said opening through said shaft from said first end to said second end thereof is an air passage and there is means for supplying air through said air passage to reduce the amount of heat conducted from said second end of said shaft to said rotor. 31. The turbo-charging system as claimed in claim 30 wherein said means to supply air through said air passage is an air jet adjacent one end of said opening through said shaft. 32. The turbo-charging system as claimed in claim 31 wherein said means to supply air through said air opening comprises an air nozzle and a source of air under pressure connected to said nozzle to blow air from said nozzle through said air opening. 33. A turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft so that said compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted-on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings, means between said first bearing and said rotor and between said second bearing and said rotor for inhibiting oil flow from said first and second bearings to said rotor, a stator within said housing; and means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed, said lubricant fluid passages being positioned with respect to said stator to cool said stator to cool said stator. 34. The turbo-charging system as claimed in claim 33 wherein said means for inhibiting oil flow to said rotor includes a seal. 35. The turbo-charging system as claimed in claim 34 wherein said means to inhibit oil flow to said rotor includes an oil slinger. 36. The turbo-charging system as claimed in claim 35 wherein said means to inhibit oil flow to said rotor includes an oil slinger. 37. A turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft rotstably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings, said rotor comprising a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube, a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft, an oil slinger on each of said collars to inhibit oil flow from said bearings to said rotor, a stator within said housing; and means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed said lubricant fluid passages being positioned with respect to said stator to cool said stator. 38. A turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing; an air compress or scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings, said rotor comprising a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube, a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft, an oil seal on each of said collars to inhibit oil flow from said bearings to said rotor, a stator within said housing; and means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhausts gas flow is insufficient to maintain such selected speed said lubricant fluid passages being positioned with respect to said stator to cool said stator. 39. A turbo-charging system comprising: a. housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearings, said shaft extending out of both said first and said second ends of said housing; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end said shaft with terminal insulation between said gas turbine rotor and said shaft to inhibit heat transfer from said rotor so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings, said rotor comprising a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube, a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft, an oil slinger on each of said collars to inhibit oil flow from said bearings to said rotor, a stator within said housing; and means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed said lubricant fluid passages being positioned with respect to said stator to cool said stator. 40. A turbo-charging system comprising: a housing, said housing having a first end and a second end, said housing having a shaft extending therethrough, first and second spaced bearings mounted in said housing, said shaft extending through said bearings so that said shaft is rotatably mounted on said bearing said shaft extending out of both said first and said second ends of said housing; an air compressor scroll mounted on said first end of said housing and an air compressor rotor mounted on said first end of said shaft with thermal insulation between said gas turbine rotor and said shaft to inhibit heat transfer from said rotor so that said air compressor scroll can be connected to supply charging air to an internal combustion engine; an exhaust gas scroll mounted on said second end of said housing and an exhaust gas turbine rotor mounted on said second end of said shaft so that said exhaust gas scroll can be connected to receive exhaust gas from an internal combustion engine and drive said shaft, said housing having passages therein for connection of a lubricant fluid supply thereto for lubricating said bearings in said housing and having connections thereto for draining lubricant from said housing; and an electric motor, said electric motor having a rotor attached to said shaft between said first and second spaced bearings, said rotor comprising a plurality of magnets on said shaft, each of said magnets being formed as a longitudinal segment of a cylindrical tube, a collar on said shaft adjacent each end of said rotor, said collar embracing said magnets to hold said magnets onto said shaft, an oil seal on each of said collars to inhibit oil flow from said bearings to said rotor, a stator within said housing; and means connected to said electric motor for maintaining a selected minimum rotational speed of said shaft even when exhaust gas flow is insufficient to maintain such selected speed, said lubricant fluid passages being positioned with respect to said stator to cool said stator. 41. A structure for an internal combustion engine turbo-charging system substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings. 42. A turbo-charging system substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

Documents:

2769-del-1996-abstract.pdf

2769-del-1996-assignment.pdf

2769-del-1996-claims.pdf

2769-del-1996-correspondence-others.pdf

2769-del-1996-correspondence-po.pdf

2769-del-1996-description (complete).pdf

2769-del-1996-drawings.pdf

2769-del-1996-form-1.pdf

2769-del-1996-form-19.pdf

2769-del-1996-form-2.pdf

2769-del-1996-form-3.pdf

2769-del-1996-form-4.pdf

2769-del-1996-form-6.pdf

2769-del-1996-gpa.pdf

2769-del-1996-petition-137.pdf

abstract.jpg