US2970509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera viewfinder attachment for varying the field of view
Assignee: Eugen Bauer GmbH
•
Filing: 1956-04-17
•
Granted: 1961-02-07
•
Expires: 1976-04-17
Abstract
No abstract record available.
Inventors
- 👤 Barthruff Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:41
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2509833A
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US2607275A
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US2641965A
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US2653528A
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US2953981A
Cited
DE935886C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |