US2839833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized celestial navigation instrument
Assignee: Individual
•
Filing: 1952-03-26
•
Granted: 1958-06-24
•
Expires: 1972-03-26
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Hagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
G; G01; G01C; G01C1/00; G03; G03B; G03B15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US20506A
Cited
US464261A
Cited
US538889A
Cited
US667785A
Cited
US686127A
Cited
GB150125A
Cited
US2064062A
Cited
US2337587A
Cited
US2403091A
Cited
US2612693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-23 | 1961-12-23 | 1962-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-23 | 1965-12-23 | 1966-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-23 | 1969-12-23 | 1970-06-24 | $7700.00 | Window Closed / Lapsed |