US2941307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic compass
Assignee: Individual
•
Filing: 1955-02-04
•
Granted: 1960-06-21
•
Expires: 1975-02-04
Abstract
No abstract record available.
Inventors
- 👤 Clare L Frisbie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:13
CPC Classifications
G; G01; G01C; G01C17/00; Y; Y10; Y10S; Y10S116/00; Y10S116/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB150843A
Cited
US1397490A
Cited
US1589039A
Cited
US1968556A
Cited
US2192148A
Cited
US2513044A
Cited
US2688805A
Cited
US2738591A
Cited
US2775045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-21 | 1963-12-21 | 1964-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-21 | 1967-12-21 | 1968-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-21 | 1971-12-21 | 1972-06-21 | $7700.00 | Window Closed / Lapsed |