US2637242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Condenser lens system for projectors
Assignee: American Optical Corp
•
Filing: 1949-02-08
•
Granted: 1953-05-05
•
Expires: 1969-02-08
Abstract
No abstract record available.
Inventors
- 👤 Osterberg Harold
- 👤 Robert M Muller
- 👤 Rudolf K Luneburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:01
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/208
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US934579A
Cited
US1143287A
Cited
US1174479A
Cited
US1507212A
Cited
US1615674A
Cited
US1946088A
Cited
US1923817A
Cited
US2314838A
Cited
US2100290A
Cited
US2140979A
Cited
US2284567A
Cited
US2373815A
Cited
US2482098A
Cited
US2479907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |