Patent US2280797A successfully refreshed from Google Patents.
US2280797A
Expired / Lapsed
US
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Aerial flight instrument
Assignee: Individual
•
Filing: 1935-03-06
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Granted: 1942-04-28
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Expires: 1955-03-06
Abstract
No abstract record available.
Inventors
- 👤 Carl J Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
G; G01; G01C; G01C23/00; Y; Y10; Y10S; Y10S116/00; Y10S116/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-04-27 | 1945-10-27 | 1946-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-27 | 1949-10-27 | 1950-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-27 | 1953-10-27 | 1954-04-28 | $7700.00 | Window Closed / Lapsed |