US2764172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air venting valve
Assignee: Northrop Grumman Corp
•
Filing: 1951-10-22
•
Granted: 1956-09-25
•
Expires: 1971-10-22
Abstract
No abstract record available.
Inventors
- 👤 Chalmers A Strayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:07
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/005; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0874; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/309; Y10T137/3099
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US821624A
Cited
GB127939A
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US1517459A
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US1966706A
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US1923384A
Cited
US2111473A
Cited
US2194348A
Cited
US2195266A
Cited
US2182266A
Cited
US2396233A
Cited
US2510098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |