US2384484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft flight indicator and system
Assignee: Sperry Gyroscope Co Ltd
•
Filing: 1941-02-08
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Granted: 1945-09-11
•
Expires: 1961-02-08
Abstract
No abstract record available.
Inventors
- 👤 Norden Elwood
- 👤 Frederick Q Gemmill
- 👤 Eric J Isbister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:33
CPC Classifications
B; B64; B64D; B64D43/00; B64D43/02; G; G01; G01C; G01C19/00; G01C21/00; G01C21/10; G01C21/12; G01C21/16
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) | 1948-09-10 | 1949-03-12 | 1949-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-09-10 | 1953-03-12 | 1953-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-09-10 | 1957-03-12 | 1957-09-11 | $7700.00 | Window Closed / Lapsed |