US2494025A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical objectives with two-part negative component having variable central air space of zero power
Assignee: Eastman Kodak Co
•
Filing: 1948-05-28
•
Granted: 1950-01-10
•
Expires: 1968-05-28
Abstract
No abstract record available.
Inventors
- 👤 Fred E Altman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:20
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189322607A
Cited
GB191203799A
Cited
US1361207A
Cited
FR537460A
Cited
US1937168A
Cited
DE697038C
Cited
US2279384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |