Patent US3407817A successfully refreshed from Google Patents.
US3085555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic hammer rock drill
Assignee: Ingersoll Rand Co
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Filing: 1960-05-31
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Granted: 1963-04-16
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Expires: 1980-05-31
Abstract
No abstract record available.
Inventors
- 👤 Mary B Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:17
CPC Classifications
E; E21; E21B; E21B4/00; E21B4/06; E21B4/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PNEUMATIC HAMMER ROCK DRILL COMPRISING A CYLINDER, A RECIPROCATORY HAMMER PISTON IN SAID CYLINDER, A DRILL IMPLEMENT EXTENDING INTO SAID CYLINDER IN POSITION TO BE STRUCK BY SAID PISTON, MEANS ALTERNATELY TO ADMIT COMPRESSED AIR TO THE OPPOSED ENDS OF THE CYLINDER TO ACTUATE SAID PISTON, SAID MEANS ACTUATED RESPONSIVE TO PISTON TERMINAL STROKE POSITION, SAID PISTON BEING PROVIDED WITH A CENTRAL AXIAL PASSAGE, SAID IMPLEMENT HAVING AN EXHAUST PASSAGE TO CONDUCT EXHAUST AIR FROM SAID CYLINDER ABOVE AND BELOW SAID PISTON AND A SEPARATE NONMETALLIC TUBE SECURED IN SAID EXHAUST PASSAGE IN SAID IMPLEMENT AND EXTENDING UPWARDLY INTO SAID CYLINDER IN ALIGNMENT WITH THE CENTRAL PASSAGE OF SAID PISTON, SAID TUBE COOPERATING WITH SAID CENTRAL AXIAL PASSAGE OF SAID PISTON TO CONDUCT EXHAUST FLUID FROM SAID CYLINDER BELOW THE PISTON DURING THE INITIAL PART OF SAID PISTON MOVEMENT IN A DIRECTION
Claim 2
Dependent Claim
143 words
A PNEUMATIC HAMMER ROCK DRILL COMPRISING A CYLINDER, A RECIPROCATORY HAMMER PISTON IN SAID CYLINDER, A DRILL IMPLEMENT EXTENDING INTO SAID CYLINDER IN POSITION TO BE STRUCK BY SAID PISTON, MEANS ALTERNATELY TO ADMIT COMPRESSED AIR TO THE OPPOSED ENDS OF THE CYLINDER TO ACTUATE SAID PISTON, SAID MEANS ACTUATED RESPONSIVE TO PISTON TERMINAL STROKE POSITION, SAID PISTON BEING PROVIDED WITH A CENTRAL AXIAL PASSAGE, SAID IMPLEMENT HAVING AN EXHAUST PASSAGE TO CONDUCT EXHAUST AIR FROM SAID CYLINDER ABOVE AND BELOW SAID PISTON AND A SEPARATE NONMETALLIC TUBE SECURED IN SAID EXHAUST PASSAGE IN SAID IMPLEMENT AND EXTENDING UPWARDLY INTO SAID CYLINDER IN ALIGNMENT WITH THE CENTRAL PASSAGE OF SAID PISTON, SAID TUBE COOPERATING WITH SAID CENTRAL AXIAL PASSAGE OF SAID PISTON TO CONDUCT EXHAUST FLUID FROM SAID CYLINDER BELOW THE PISTON DURING THE INITIAL PART OF SAID PISTON MOVEMENT IN A DIRECTION
References Cited (Backward Citations)
US458291A
Cited
US3012540A
Cited
US1648877A
Cited
US1657317A
Cited
US1892517A
Cited
US2725214A
Cited
US2790624A
Cited
US2853973A
Cited
US2859733A
Cited
US2937619A
Cited
US2947519A
Cited
US2979033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-15 | 1966-10-15 | 1967-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-15 | 1970-10-15 | 1971-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-15 | 1974-10-15 | 1975-04-16 | $7700.00 | Window Closed / Lapsed |