US2679991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closure for air ducts of aircraft
Assignee: Chance Vought Aircraft Inc
•
Filing: 1951-11-15
•
Granted: 1954-06-01
•
Expires: 1971-11-15
Abstract
No abstract record available.
Inventors
- 👤 Norton D Eagon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:07
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/04; F02C7/05; Y; Y10; Y10T; Y10T74/00; Y10T74/20; Y10T74/20576; Y10T74/20636; Y10T74/20648
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1579324A
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US1820686A
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US1564261A
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US1628506A
Cited
FR779655A
Cited
US2280835A
Cited
US2212252A
Cited
FR50033E
Cited
US2428708A
Cited
US2529973A
Cited
US2575086A
Cited
US2499256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-31 | 1957-11-30 | 1958-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-31 | 1961-11-30 | 1962-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-31 | 1965-11-30 | 1966-06-01 | $7700.00 | Window Closed / Lapsed |