Patent US2939697A successfully refreshed from Google Patents.
US2939697A
Expired / Lapsed
US
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Liquid spring
Assignee: Cleveland Pneumatic Industries Inc
•
Filing: 1956-01-23
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Granted: 1960-06-07
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Expires: 1976-01-23
Abstract
No abstract record available.
Inventors
- 👤 Walter H Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:03
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/50; F16F9/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB105053A
Cited
US2566736A
Cited
US2620182A
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US2643112A
Cited
US2648949A
Cited
US2756989A
Cited
US2785887A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |