US3103150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror reflex cameras
Assignee: Balda Werke Photographische Gerate und Kunststof GmbH and Co KG
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Filing: 1961-09-11
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Granted: 1963-09-10
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Lange Karl Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:12
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09976
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A MIRROR REFLEX CAMERA HAVING AN OPTICAL VIEWFINDER SYSTEM COMPRISING A VIEW-FINDER CHAMBER, A ROOFEDGE PRISM, AN IMAGE RECEIVING SURFACE, AN EYE-PIECE, A MIRROR CORRECTING THE UPRIGHT VIEW-FINDER IMAGE, MEANS LOCATING SAID MIRROR BETWEEN SAID ROOF-EDGE PRISM AND SAID IMAGE RECEIVING SURFACE, AND A LIGHT CELL INCLUDING MEANS SECURING SAID CELL ON THE INNER WALL OF SAID VIEWFINDER CHAMBER OPPOSITE SAID EYE-PIECE, SAID MIRROR BEING PARTIALLY PERMEABLE TO LIGHT REFLECTING A PORTION OF THE LIGHT IMPINGING ON IT TO SAID LIGHT CELL FOR MEASURING OF THE INTENSITY OF ILLUMINATION OF SAID VIEW-FINDER IMAGE AND THE OTHER PORTION PASSING THROUGH SAME TO SAID PRISM.
Claim 2
Dependent Claim
103 words
A MIRROR REFLEX CAMERA HAVING AN OPTICAL VIEWFINDER SYSTEM COMPRISING A VIEW-FINDER CHAMBER, A ROOFEDGE PRISM, AN IMAGE RECEIVING SURFACE, AN EYE-PIECE, A MIRROR CORRECTING THE UPRIGHT VIEW-FINDER IMAGE, MEANS LOCATING SAID MIRROR BETWEEN SAID ROOF-EDGE PRISM AND SAID IMAGE RECEIVING SURFACE, AND A LIGHT CELL INCLUDING MEANS SECURING SAID CELL ON THE INNER WALL OF SAID VIEWFINDER CHAMBER OPPOSITE SAID EYE-PIECE, SAID MIRROR BEING PARTIALLY PERMEABLE TO LIGHT REFLECTING A PORTION OF THE LIGHT IMPINGING ON IT TO SAID LIGHT CELL FOR MEASURING OF THE INTENSITY OF ILLUMINATION OF SAID VIEW-FINDER IMAGE AND THE OTHER PORTION PASSING THROUGH SAME TO SAID PRISM.
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) | 1966-09-09 | 1967-03-11 | 1967-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-09 | 1971-03-11 | 1971-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-09 | 1975-03-11 | 1975-09-10 | $7700.00 | Window Closed / Lapsed |