US2991691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light condenser
Assignee: Kamera und Kinowerke Dresden VEB
•
Filing: 1957-08-14
•
Granted: 1961-07-11
•
Expires: 1977-08-14
Abstract
No abstract record available.
Inventors
- 👤 Schering Helmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:51
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/20; G03B21/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1333304A
Cited
US1762932A
Cited
US2186123A
Cited
US2183249A
Cited
US2202061A
Cited
US2270517A
Cited
US2195184A
Cited
US2326970A
Cited
US2803163A
Cited
GB741246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |