Patent US2838413A successfully refreshed from Google Patents.
Patent US3218946A successfully refreshed from Google Patents.
US3218946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable prism viewfinder unit for reflex camera with reflecting means for viewing exposure meter
Assignee: WILHELM MEXNER
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Filing: 1960-11-02
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Granted: 1965-11-23
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Expires: 1980-11-02
Abstract
No abstract record available.
Inventors
- 👤 Lange Karl Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:42
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
IN A REFLEX CAMERA HAVING A FIRST HOUSING, A WINDOW IN SAID FIRST HOUSING, AN EXPOSURE METER LOCATED BENEATH SAID WINDOW IN SAID FIRST HOUSING, SAID EXPOSURE METER HAVING A MOVABLE POINTER AND A SCALE THEREON; THE COMBINATION WITH AN INVERTING PENTA-ROOF-PRISM VIEWFINDER HAVING AN EYEPIECE ENCOMPASSING THE VIEWFIELD THEREOF, SAID PRISM VIEWFINDER BEING ENCLOSED IN A SECOND HOUSING LOCATED IN SAID FIRST HOUSING, SAID SECOND HOUSING AND SAID PRISM VIEWFINDER CONSTITUTING A REMOVABLE UNIT STRUCTURE BEING ARRANGED TO BE INTERCHANGED WITH A CONVENTIONAL, OPEN LIGHT-CONDUCTING SHAFT FORMING A VIEWING HOOD, OF FIRST REFLECTING MEANS DISPOSED IN SAID SECOND HOUSING LATERALLY ADJACENT SAID VIEWFINDER BETWEEN THE REAR FACE OF SAID PENTA-ROOF-PRISM AND THE APERTURE OF SAID EYEPIECE, SAID FIRST REFLECTING MEANS OPTICALLY REPRESENTING AN INDEPENDENT NARROW ELONGATED IMAGE AREA LATERALLY ADJACENT SAID VIEWFIELD IN SAID EYEPIECE, SAID FIRST MEANS HAVING A REFLECTING SURFACE ARRANGED AT AN ANGLE OF APPROXIMATELY 45* TO SAID VIEWFINDER EYEPIECE AXIS, THE
Claim 2
Dependent Claim
156 words
IN A REFLEX CAMERA HAVING A FIRST HOUSING, A WINDOW IN SAID FIRST HOUSING, AN EXPOSURE METER LOCATED BENEATH SAID WINDOW IN SAID FIRST HOUSING, SAID EXPOSURE METER HAVING A MOVABLE POINTER AND A SCALE THEREON; THE COMBINATION WITH AN INVERTING PENTA-ROOF-PRISM VIEWFINDER HAVING AN EYEPIECE ENCOMPASSING THE VIEWFIELD THEREOF, SAID PRISM VIEWFINDER BEING ENCLOSED IN A SECOND HOUSING LOCATED IN SAID FIRST HOUSING, SAID SECOND HOUSING AND SAID PRISM VIEWFINDER CONSTITUTING A REMOVABLE UNIT STRUCTURE BEING ARRANGED TO BE INTERCHANGED WITH A CONVENTIONAL, OPEN LIGHT-CONDUCTING SHAFT FORMING A VIEWING HOOD, OF FIRST REFLECTING MEANS DISPOSED IN SAID SECOND HOUSING LATERALLY ADJACENT SAID VIEWFINDER BETWEEN THE REAR FACE OF SAID PENTA-ROOF-PRISM AND THE APERTURE OF SAID EYEPIECE, SAID FIRST REFLECTING MEANS OPTICALLY REPRESENTING AN INDEPENDENT NARROW ELONGATED IMAGE AREA LATERALLY ADJACENT SAID VIEWFIELD IN SAID EYEPIECE, SAID FIRST MEANS HAVING A REFLECTING SURFACE ARRANGED AT AN ANGLE OF APPROXIMATELY 45* TO SAID VIEWFINDER EYEPIECE AXIS, THE
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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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |