US1977689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system
Assignee: Individual
•
Filing: 1929-09-23
•
Granted: 1934-10-23
•
Expires: 1949-09-23
Abstract
No abstract record available.
Inventors
- 👤 Muller Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:50
CPC Classifications
B; B61; B61L; B61L5/00; B61L5/12; B61L5/18; B61L5/1809; B61L5/1845; F; F21; F21V; F21V5/00; F21V5/02; G; G02; G02B; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B19/0061; G02B3/00; G02B3/02; G02B3/08; G08; G08G; G08G1/00; G08G1/09; G08G1/095; F21V7/00; F21V7/0091; F21W; F21W2111/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
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) | 1937-10-22 | 1938-04-23 | 1938-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-22 | 1942-04-23 | 1942-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-22 | 1946-04-23 | 1946-10-23 | $7700.00 | Window Closed / Lapsed |