Patent US2548569A successfully refreshed from Google Patents.
US2548569A
Expired / Lapsed
US
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Reversed telephoto objective having a high-index positive front lens element
Assignee: Eastman Kodak Co
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Filing: 1949-11-04
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Granted: 1951-04-10
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Expires: 1969-11-04
Abstract
No abstract record available.
Inventors
- 👤 Tolle Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:21
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/12; G02B13/00; G02B13/04; G02B9/34; G02B9/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1085868A
Cited
US1862950A
Cited
US1955590A
Cited
GB388215A
Cited
US1996054A
Cited
US2126126A
Cited
US2247068A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-09 | 1954-10-09 | 1955-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-09 | 1958-10-09 | 1959-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-09 | 1962-10-09 | 1963-04-10 | $7700.00 | Window Closed / Lapsed |