US2395921A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Horizontal reference means for sextants and the like
Assignee: Individual
•
Filing: 1944-04-11
•
Granted: 1946-03-05
•
Expires: 1964-04-11
Abstract
No abstract record available.
Inventors
- 👤 Thurlow Alma Lois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:44
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/02; G02B23/10; 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) | 1949-03-04 | 1949-09-03 | 1950-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-03-04 | 1953-09-03 | 1954-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-03-04 | 1957-09-03 | 1958-03-05 | $7700.00 | Window Closed / Lapsed |