US2688957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air inlet valve
Assignee: Individual
•
Filing: 1952-06-03
•
Granted: 1954-09-14
•
Expires: 1972-06-03
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Culp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:05
CPC Classifications
F; F02; F02M; F02M23/00; F02M23/04; F02M23/08; F02M23/09; F02M23/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87338; Y10T137/87362
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1375610A
Cited
US2311351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |