US2771810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible viewfinder for photographic cameras
Assignee: Voigtlander AG
•
Filing: 1954-09-17
•
Granted: 1956-11-27
•
Expires: 1974-09-17
Abstract
No abstract record available.
Inventors
- 👤 Sommer Richard
- 👤 Hofmeister Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:21
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1152782A
Cited
US1671588A
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GB351484A
Cited
GB368603A
Cited
US1933784A
Cited
GB417285A
Cited
US2461499A
Cited
US2552940A
Cited
US2529944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |