US3149547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing plate for a photographic camera viewfinder
Assignee: Kamera und Kinowerke Dresden VEB
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Filing: 1961-01-05
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Granted: 1964-09-22
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Expires: 1981-01-05
Abstract
No abstract record available.
Inventors
- 👤 Jurenz Rolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/18; G03B13/24; G03B13/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A VIEWFINDER FOCUSING PLATE FOR A PHOTOGRAPHIC CAMERA, COMPRISING A COINCIDENCE WEDGE PAIR IN THE MIDDLE PART OF THE PLATE, A PLURALITY OF IMAGE-DISTORTING, FOCUS-INDICATING LENSES WHICH SURROUND THE WEDGE PAIR, EACH OF SAID LENSES BEING FORMED GEOMETRICALLY BY A CYLINDRICAL PORTION AND A PRISM PORTION, AND A PLURALITY OF FRESNEL RINGS SURROUNDING THE CYLINDRICAL LENSES.
Claim 2
Dependent Claim
56 words
A VIEWFINDER FOCUSING PLATE FOR A PHOTOGRAPHIC CAMERA, COMPRISING A COINCIDENCE WEDGE PAIR IN THE MIDDLE PART OF THE PLATE, A PLURALITY OF IMAGE-DISTORTING, FOCUS-INDICATING LENSES WHICH SURROUND THE WEDGE PAIR, EACH OF SAID LENSES BEING FORMED GEOMETRICALLY BY A CYLINDRICAL PORTION AND A PRISM PORTION, AND A PLURALITY OF FRESNEL RINGS SURROUNDING THE CYLINDRICAL LENSES.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |