US3387530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror reflex viewfinder with roof edge prism
Assignee: Zeiss Ikon AG
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Filing: 1962-11-01
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Granted: 1968-06-11
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Expires: 1982-11-01
Abstract
No abstract record available.
Inventors
- 👤 Ebertz Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:45
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/14; G01; G01J; G01J1/00; G01J1/38; G01J1/40; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
IN A MIRROR REFLEX VIEWFINDER, THE COMBINATION WITH A ROOF EDGE PRISM HAVING A REFLECTING SURFACE FOR TURNING THE VIEWFINDER IMAGE INTO AN UPRIGHT POSITION AND AN ENTRANCE SURFACE ARRANGED OPPOSITE OF TWO ROOF FACES, OF ADDITIONAL PRISM MEANS FOR PROJECTING AN INDICATING MARK INTO THE FOCUSING PLANE OF THE VIEWFINDER IMAGE, SAID PRISM MEANS COMPRISING A MIRROR SURFACE ARRANGED OUTSIDE OF SAID VIEWFINDER FOCUSING PLANE BUT WITHIN THE RANGE AND CONFINES OF SAID PRISM ENTRANCE SURFACE AND ANOTHER SURFACE EXTENDING OBLIQUELY TO SAID MIRROR SURFACE
Claim 2
Dependent Claim
86 words
IN A MIRROR REFLEX VIEWFINDER, THE COMBINATION WITH A ROOF EDGE PRISM HAVING A REFLECTING SURFACE FOR TURNING THE VIEWFINDER IMAGE INTO AN UPRIGHT POSITION AND AN ENTRANCE SURFACE ARRANGED OPPOSITE OF TWO ROOF FACES, OF ADDITIONAL PRISM MEANS FOR PROJECTING AN INDICATING MARK INTO THE FOCUSING PLANE OF THE VIEWFINDER IMAGE, SAID PRISM MEANS COMPRISING A MIRROR SURFACE ARRANGED OUTSIDE OF SAID VIEWFINDER FOCUSING PLANE BUT WITHIN THE RANGE AND CONFINES OF SAID PRISM ENTRANCE SURFACE AND ANOTHER SURFACE EXTENDING OBLIQUELY TO SAID MIRROR SURFACE
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |