US2660977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flight instrument
Assignee: Individual
•
Filing: 1949-10-28
•
Granted: 1953-12-01
•
Expires: 1969-10-28
Abstract
No abstract record available.
Inventors
- 👤 Prince H Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:41
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)
US1415158A
Cited
US1924037A
Cited
US1942343A
Cited
US1836881A
Cited
CH180224A
Cited
FR757811A
Cited
FR46012E
Cited
US2280797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |