US2640529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic low pressure venting and signaling check valve for fuel tank pressurizing systems
Assignee: United States Department of the Army
•
Filing: 1950-08-01
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Granted: 1953-06-02
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Expires: 1970-08-01
Abstract
No abstract record available.
Inventors
- 👤 Jr William F Macglashan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:07
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/42; F02K9/44; F02K9/50; F02K9/56; F02K9/566; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1692; Y10T137/1714; Y10T137/2496; Y10T137/2703; Y10T137/2705; Y10T137/7722; Y10T137/7723; Y10T137/7725; Y10T137/7837; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7931; Y10T137/7932; Y10T137/8158; Y10T137/8326
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1675849A
Cited
US1900229A
Cited
US2093015A
Cited
US2204757A
Cited
US2307949A
Cited
US2402826A
Cited
US2554390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |