US2827835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Petzval type projection objective having a concavely curved image surface
Assignee: Eastman Kodak Co
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Filing: 1956-05-31
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Granted: 1958-03-25
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Expires: 1976-05-31
Abstract
No abstract record available.
Inventors
- 👤 Willy E Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:47
CPC Classifications
G; G02; G02B; G02B13/00; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |