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US3198188A
Expired / Lapsed
US
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Valve stem seal
Assignee: Perfect Circle Corp
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Filing: 1961-03-29
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Granted: 1965-08-03
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Expires: 1981-03-29
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert W Heid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:47
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN COMBINATION WITH A VALVE STEM GUIDE FOR A RECIPROCATING VALVE STEM, SAID VALVE STEM GUIDE HAVING A PORTION OF REDUCED EXTERNAL DIAMETER AT ITS END, A SEAL COMPRISING A PAIR OF COLLARS ADAPTED RESPECTIVELY TO HUG SAID STEM AND TO GRIP SAID REDUCED DIAMETER PROTION, SAID COLLARS BEING INTEGRALLY AND RELATIVELY RIGIDLY CONNECTED TO EACH OTHER IN END-TO-END RELATION, THE ONE OF SAID COLLARS WHICH GRIPS SAID REDUCED DIAMETER PORTION BEING THE SOLE MEANS FOR HOLDING THE OTHER OF SAID COLLARS AGAINST MOVEMENT AND A PAIR OF CONTRACTILE SPRINGS COILED ABOUT THE RESPECTIVE COLLARS TO INCREASE THE HUGGING AND GRIPPING ACTIONS THEREOF, THE MAXIMUM OUTSIDE DIAMETER OF SAID SEAL BEING LESS THAN THE DIAMETER OF SAID GUIDE BEYOND SAID REDUCED PORTION.
Claim 2
Dependent Claim
122 words
IN COMBINATION WITH A VALVE STEM GUIDE FOR A RECIPROCATING VALVE STEM, SAID VALVE STEM GUIDE HAVING A PORTION OF REDUCED EXTERNAL DIAMETER AT ITS END, A SEAL COMPRISING A PAIR OF COLLARS ADAPTED RESPECTIVELY TO HUG SAID STEM AND TO GRIP SAID REDUCED DIAMETER PROTION, SAID COLLARS BEING INTEGRALLY AND RELATIVELY RIGIDLY CONNECTED TO EACH OTHER IN END-TO-END RELATION, THE ONE OF SAID COLLARS WHICH GRIPS SAID REDUCED DIAMETER PORTION BEING THE SOLE MEANS FOR HOLDING THE OTHER OF SAID COLLARS AGAINST MOVEMENT AND A PAIR OF CONTRACTILE SPRINGS COILED ABOUT THE RESPECTIVE COLLARS TO INCREASE THE HUGGING AND GRIPPING ACTIONS THEREOF, THE MAXIMUM OUTSIDE DIAMETER OF SAID SEAL BEING LESS THAN THE DIAMETER OF SAID GUIDE BEYOND SAID REDUCED PORTION.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |