US2645240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control device
Assignee: MARQUARDT AIRCRAFT Co
•
Filing: 1948-10-11
•
Granted: 1953-07-14
•
Expires: 1968-10-11
Abstract
No abstract record available.
Inventors
- 👤 John A Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/04; G05D16/06; G05D16/0616; G05D16/0619; G05D16/0622; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2496; Y10T137/2514; Y10T137/2521
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US647758A
Cited
US787136A
Cited
US1112641A
Cited
US1178222A
Cited
US2082325A
Cited
US2320886A
Cited
US2374523A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |