US3446294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion tool
Assignee: Sullivan Machinery Co
•
Filing: 1966-03-14
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Granted: 1969-05-27
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Expires: 1986-03-14
Abstract
No abstract record available.
Inventors
- 👤 Edward A Bailey
- 👤 Richard W Beaumont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:03
CPC Classifications
B; B25; B25D; B25D17/00; B25D17/04; B25D17/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A HAND HELD PERCUSSION TOOL OF THE TYPE WHICH COMPRISES AN ELONGATED BODY PORTION WITH A THROUGH BODY CAVITY THEREIN HAVING AN ELONGATED HOLLOW CYLINDRICAL SLEEVE INSERTABLE FROM ONE END THEREOF, SAID SLEEVE FORMING A CYLINDER WHEREIN A PISTON IS SUPPORTED AND GUIDED FOR RECIPROCAL MOTION THEREIN, THE IMPROVEMENT COMPRISING: SAID SLEEVE HAVING AT LEAST THE INNER SURFACE THEREOF TREATED WITH A FRICTION REDUCING SOLID MATERIAL HAVING A LOWER COEFFICIENT OF FRICTION WITH RESPECT TO SAID PISTON THAN THE COEFFICIENT OF FRICTION OF THE MATERIAL OF SAID SLEEVE WITH RESPECT TO SAID PISTON.
Claim 2
Dependent Claim
94 words
IN A HAND HELD PERCUSSION TOOL OF THE TYPE WHICH COMPRISES AN ELONGATED BODY PORTION WITH A THROUGH BODY CAVITY THEREIN HAVING AN ELONGATED HOLLOW CYLINDRICAL SLEEVE INSERTABLE FROM ONE END THEREOF, SAID SLEEVE FORMING A CYLINDER WHEREIN A PISTON IS SUPPORTED AND GUIDED FOR RECIPROCAL MOTION THEREIN, THE IMPROVEMENT COMPRISING: SAID SLEEVE HAVING AT LEAST THE INNER SURFACE THEREOF TREATED WITH A FRICTION REDUCING SOLID MATERIAL HAVING A LOWER COEFFICIENT OF FRICTION WITH RESPECT TO SAID PISTON THAN THE COEFFICIENT OF FRICTION OF THE MATERIAL OF SAID SLEEVE WITH RESPECT TO SAID PISTON.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |