US2679333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable length tank vent
Assignee: Northrop Grumman Corp
•
Filing: 1952-03-08
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Granted: 1954-05-25
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Expires: 1972-03-08
Abstract
No abstract record available.
Inventors
- 👤 Halvar G Starck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:41
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/02; B64D37/14; B64D37/20; B64D37/22; F; F01; F01M; F01M11/00; F01M11/06; F01M11/062; F01M11/065; F01M11/067; F01M13/00; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0874; Y10T137/8593; Y10T137/86236; Y10T137/86252
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1791045A
Cited
US713560A
Cited
US781939A
Cited
US1746701A
Cited
US1852558A
Cited
US1871055A
Cited
US1978529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-24 | 1957-11-23 | 1958-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-24 | 1961-11-23 | 1962-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-24 | 1965-11-23 | 1966-05-25 | $7700.00 | Window Closed / Lapsed |