Patent US2773577A successfully refreshed from Google Patents.
US2773577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air valve with ring-type piston
Assignee: Individual
•
Filing: 1953-05-12
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Granted: 1956-12-11
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Expires: 1973-05-12
Abstract
No abstract record available.
Inventors
- 👤 Kapenkin Vladimir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:02
CPC Classifications
F; F16; F16D; F16D67/00; F16D67/02; F16D67/04; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1414; F15B15/1419; F16D25/00; F16D25/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2603327A
Cited
US1864126A
Cited
US2205989A
Cited
US2342880A
Cited
US2489258A
Cited
US2578308A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |