US1531615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft sextant
Assignee: Individual
•
Filing: 1921-06-03
•
Granted: 1925-03-31
•
Expires: 1941-06-03
Abstract
No abstract record available.
Inventors
- 👤 Franklin L Hunt
- 👤 Karl H Beij
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:53
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/08; G01C1/10
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) | 1928-03-30 | 1928-09-29 | 1929-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-03-30 | 1932-09-29 | 1933-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-03-30 | 1936-09-29 | 1937-03-31 | $7700.00 | Window Closed / Lapsed |