Patent US2828670A successfully refreshed from Google Patents.
US2828670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prism-lens optical systems of variable focal length and including two anamorphotic prismatic systems
Assignee: Eastman Kodak Co
•
Filing: 1954-08-30
•
Granted: 1958-04-01
•
Expires: 1974-08-30
Abstract
No abstract record available.
Inventors
- 👤 Benjamin E Luboshez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:16
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/08; G02B13/10; G02B15/00; G02B15/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1647631A
Cited
GB189808512A
Cited
US818553A
Cited
US1758801A
Cited
US1931992A
Cited
GB338962A
Cited
US1905442A
Cited
US1898787A
Cited
US1932082A
Cited
US2023217A
Cited
US2048284A
Cited
US2375634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |