Patent US3101194A successfully refreshed from Google Patents.
US3101194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic spring
Assignee: W E HENNELLS CO Inc
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Filing: 1961-09-11
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Granted: 1963-08-20
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Sr William E Hennells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:37
CPC Classifications
B; B21; B21D; B21D24/00; B21D24/02; F; F16; F16F; F16F9/00; F16F9/02; F16F9/0209
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
158 words
A SELF-CONTAINED PNEUMATIC SPRING COMPRISING A TUBULAR MEMBER HAVING ONE CLOSED END, A PISTON SLIDABLY DISPOSED WITHIN SAID TUBULAR MEMBER, A PISTON ROD CONNECTED TO THE PISTON AND EXTENDING OUTWARDLY THROUGH THE OPEN END OF THE TUBULAR MEMBER, SAID TUBULAR MEMBER HAVING A BEARING PLATE IN THE OPEN END THEREOF FOR SLIDABLY RECEIVING THE PISTON ROD FOR GUIDING THE MOVEMENT THEREOF AND LIMITING THE OUTWARD MOVEMENT OF THE PISTON SAID PISTON ROD BEING IN THE FORM OF AN ENLARGED HOLLOW MEMBER HAVING A CLOSED END AND AN OPEN END COMMUNICATING THROUGH THE PISTON WITH THE AIR CHAMBER DEFINED BETWEEN THE PISTON AND SAID CLOSED END OF SAID TUBULAR MEMBER, ONE OF SAID CLOSED ENDS BEING AT THE BOTTOM OF SAID PNEUMATIC SPRING AND HAVING AN OUTWARDLY OPENING, SPRING-URGED PRESSURE RELIEF CHECK VALVE THEREIN COMMUNICATING WITH SAID AIR CHAMBER FOR RELIEVING PRESSURE IN EXCESS OF A PREDETERMINED VALUE THEREFROM AND ALSO DISCHARGING FOREIGN MATTER THEREFROM; AND A VALVE MOUNT-
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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) | 1966-08-19 | 1967-02-18 | 1967-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-19 | 1971-02-18 | 1971-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-19 | 1975-02-18 | 1975-08-20 | $7700.00 | Window Closed / Lapsed |