Patent US2523570A successfully refreshed from Google Patents.
US2523570A
Expired / Lapsed
US
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Spring retainer for spring actuated poppet valves
Assignee: Individual
•
Filing: 1947-03-05
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Granted: 1950-09-26
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Expires: 1967-03-05
Abstract
No abstract record available.
Inventors
- 👤 Holdsworth George Geoffrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:47
CPC Classifications
F; F01; F01L; F01L3/00; F01L3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |