| Title of Invention | A DOWN -THE -HOLE PERCUSSIVE HAMMER FOR ROCK DRILLING |
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| Abstract | A down-the-hole percussive hammer for rock drilling includes a cylindrical casing and a drill bit disposed at a front end of the casing. The drill bit includes a forwardly facing cutting surface and a center longitudinal passage extending forwardly through a rearwardly facing rearwardmost end surface of the drill bit. The passage includes a rearwardly facing impact surface. A piston is mounted in the casing longitudinally behind the drill bit for reciprocation in a longitudinal direction. The piston includes a front portion sized to enter the center passage of the drill bit and strike the impact surface of the drill bit during each forward stroke of the piston. The impact surface of the drill bit is spaced forwardly from the rearwardmost end surface of the drill bit by a distance of at least ten percent of a total longitudinal length of the drill bit. |
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481-KOLNP-2003-(02-04-2012)-PETITION UNDER RULE 138.pdf
481-KOLNP-2003-(30-04-2012)-FORM-27.pdf
481-kolnp-2003-granted-abstract.pdf
481-kolnp-2003-granted-assignment.pdf
481-kolnp-2003-granted-claims.pdf
481-kolnp-2003-granted-correspondence.pdf
481-kolnp-2003-granted-description (complete).pdf
481-kolnp-2003-granted-drawings.pdf
481-kolnp-2003-granted-examination report.pdf
481-kolnp-2003-granted-form 1.pdf
481-kolnp-2003-granted-form 18.pdf
481-kolnp-2003-granted-form 2.pdf
481-kolnp-2003-granted-form 3.pdf
481-kolnp-2003-granted-form 5.pdf
481-kolnp-2003-granted-form 6.pdf
481-kolnp-2003-granted-gpa.pdf
481-kolnp-2003-granted-letter patent.pdf
481-kolnp-2003-granted-specification.pdf
481-kolnp-2003-granted-translated copy of priority document.pdf
| Patent Number | 220486 | ||||||||
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| Indian Patent Application Number | 481/KOLNP/2003 | ||||||||
| PG Journal Number | 22/2008 | ||||||||
| Publication Date | 30-May-2008 | ||||||||
| Grant Date | 28-May-2008 | ||||||||
| Date of Filing | 21-Apr-2003 | ||||||||
| Name of Patentee | SANDVIK INTELLECTUAL PROPERTY AB | ||||||||
| Applicant Address | S-811 81 SANDVIKEN | ||||||||
Inventors:
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| PCT International Classification Number | E21B 4/14 | ||||||||
| PCT International Application Number | PCT/SE01/02452 | ||||||||
| PCT International Filing date | 2001-11-07 | ||||||||
PCT Conventions:
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