Patent US3156320A successfully refreshed from Google Patents.
US3156320A
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Lubricating device
Assignee: Stewart Warner Corp
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Filing: 1961-06-01
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Granted: 1964-11-10
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Expires: 1981-06-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Bystricky
- 👤 Frederick G Schweisthal
- 👤 Ernest G Stock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:25
CPC Classifications
B; B65; B65G; B65G45/00; B65G45/02; B65G45/08; F; F16; F16N; F16N2270/00; F16N2270/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A LUBRICATING DEVICE, A CYLINDER HAVING A SUPPLY PORT AT ONE END THEREOF, A PISTON SLIDABLE IN THE CYLINDER AND HAVING A HEAD AND A GUIDE PORTION, A SPRING OF A PREDETERMINED STRENGTH URGING THE PISTON TOWARD SAID ONE END OF THE CYLINDER, A TUBULAR MEMBER CARRIED BY THE GUIDE PORTION OF THE PISTON AND SLIDABLE RELATIVE TO THE GUIDE PORTION OF THE PISTON, A SECOND SPRING OF SUBSTANTIALLY GREATER STRENGTH THAN SAID PREDETERMINED STRENGTH AND URGING THE TUBULAR MEMBER AWAY FROM THE HEAD OF THE PISTON, A PLUNGER MEMBER FIXED RIGIDLY TO THE PISTON AND SLIDABLE IN THE TUBULAR MEMBER TO FORCE A LUBRICANT THERETHROUGH, THE TUBULAR MEMBER HAVING A LUBRICANT SUPPLY OPENING
Claim 2
Dependent Claim
115 words
IN A LUBRICATING DEVICE, A CYLINDER HAVING A SUPPLY PORT AT ONE END THEREOF, A PISTON SLIDABLE IN THE CYLINDER AND HAVING A HEAD AND A GUIDE PORTION, A SPRING OF A PREDETERMINED STRENGTH URGING THE PISTON TOWARD SAID ONE END OF THE CYLINDER, A TUBULAR MEMBER CARRIED BY THE GUIDE PORTION OF THE PISTON AND SLIDABLE RELATIVE TO THE GUIDE PORTION OF THE PISTON, A SECOND SPRING OF SUBSTANTIALLY GREATER STRENGTH THAN SAID PREDETERMINED STRENGTH AND URGING THE TUBULAR MEMBER AWAY FROM THE HEAD OF THE PISTON, A PLUNGER MEMBER FIXED RIGIDLY TO THE PISTON AND SLIDABLE IN THE TUBULAR MEMBER TO FORCE A LUBRICANT THERETHROUGH, THE TUBULAR MEMBER HAVING A LUBRICANT SUPPLY OPENING
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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) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |