US2926577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supplementary lens structure for twin lens cameras
Assignee: Rollei Werke Franke und Heidecke GmbH and Co KG
•
Filing: 1955-05-20
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Granted: 1960-03-01
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Expires: 1975-05-20
Abstract
No abstract record available.
Inventors
- 👤 Albrecht Hermann Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:29
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR379653A
Cited
US1636736A
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US1884169A
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US1859207A
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DE600742C
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US2124297A
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US2132683A
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US2184018A
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US2482571A
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US2674932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |