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US2545935A
Expired / Lapsed
US
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Navigational instrument
Assignee: Individual
•
Filing: 1947-08-19
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Granted: 1951-03-20
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Expires: 1967-08-19
Abstract
No abstract record available.
Inventors
- 👤 Warner Louis Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:13
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1985907A
Cited
US2004951A
Cited
US2019708A
Cited
US2007986A
Cited
US2339222A
Cited
US2345020A
Cited
US2425097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-19 | 1954-09-18 | 1955-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-19 | 1958-09-18 | 1959-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-19 | 1962-09-18 | 1963-03-20 | $7700.00 | Window Closed / Lapsed |