US2420951A
Expired / Lapsed
US
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Optical apparatus for determining angles
Assignee: Individual
•
Filing: 1944-12-09
•
Granted: 1947-05-20
•
Expires: 1964-12-09
Abstract
No abstract record available.
Inventors
- 👤 Williams Joseph Henry
- 👤 Stenning Albert Edward
- 👤 Stenning Reginald Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:22
CPC Classifications
G; G01; G01C; G01C1/00; G01C1/02; G01B; G01B3/00; G01B3/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |