US2697379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compound image-forming reflecting mirror optical system
Assignee: Individual
•
Filing: 1953-09-16
•
Granted: 1954-12-21
•
Expires: 1973-09-16
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/02; G02B17/06; G02B17/0626; G02B17/008; G02B17/08; G02B17/0804; G02B17/0816
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1053650A
Cited
US1133311A
Cited
US1156896A
Cited
US1216835A
Cited
US1552451A
Cited
US1699689A
Cited
US1945926A
Cited
US2334962A
Cited
US2532685A
Cited
US2628533A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |