Patent US3121798A successfully refreshed from Google Patents.
US3121798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable diaphragm structure for photoelectric exposure meters
Assignee: Zeiss Ikon AG
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Filing: 1961-01-23
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Granted: 1964-02-18
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Expires: 1981-01-23
Abstract
No abstract record available.
Inventors
- 👤 Ploke Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:38
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214; G02; G02B; G02B5/00; G02B5/005; G03B7/00; G03B7/08; G03B7/099; G03B7/0993
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PHOTOELECTRIC EXPOSURE METER COMPRISING A PHOTOELECTRIC RECEIVER AND TWO VENETIAN BLIND STRUCTURES ARRANGED CONSECUTIVELY AND IN FRONT OF SAID PHOTOELECTRIC RECEIVER FOR VARYING THE AMOUNT OF LIGHT REACHING SAID RECEIVER, EACH OF SAID VENETIAN BLIND STRUCTURES INCLUDING A FRAME AND PARALLEL EXTENDING LOUVER SLATS PIVOTALLY SUPPORTED IN SAID FRAME, SAID VENETIAN BLIND STRUCTURES BEING ARRANGED WITH THEIR SLATS IN CRISS-CROSS INTERSECTING RELATION WITH THE SLATS OF ONE STRUCTURE MOUNTED IN BACK OF THE SLATS OF THE OTHER VENITIAN BLIND STRUCTURE, AND MEANS FOR ROTATABLY ADJUSTING IN EACH ONE OF SAID VENETIAN BLIND STRUCTURES ALL OF SAID SLATS THEREIN AT THE SAME TIME IN SUCH A MANNER THAT ADJACENT SLATS ARE ROTATABLY ADJUSTED IN OPPOSITE DIRECTIONS, AND THE WIDTH OF THE SLOTS FORMED BETWEEN SAID SLATS IS PROGRESSIVELY VARIED, THE PIVOT AXES
Claim 2
Dependent Claim
132 words
A PHOTOELECTRIC EXPOSURE METER COMPRISING A PHOTOELECTRIC RECEIVER AND TWO VENETIAN BLIND STRUCTURES ARRANGED CONSECUTIVELY AND IN FRONT OF SAID PHOTOELECTRIC RECEIVER FOR VARYING THE AMOUNT OF LIGHT REACHING SAID RECEIVER, EACH OF SAID VENETIAN BLIND STRUCTURES INCLUDING A FRAME AND PARALLEL EXTENDING LOUVER SLATS PIVOTALLY SUPPORTED IN SAID FRAME, SAID VENETIAN BLIND STRUCTURES BEING ARRANGED WITH THEIR SLATS IN CRISS-CROSS INTERSECTING RELATION WITH THE SLATS OF ONE STRUCTURE MOUNTED IN BACK OF THE SLATS OF THE OTHER VENITIAN BLIND STRUCTURE, AND MEANS FOR ROTATABLY ADJUSTING IN EACH ONE OF SAID VENETIAN BLIND STRUCTURES ALL OF SAID SLATS THEREIN AT THE SAME TIME IN SUCH A MANNER THAT ADJACENT SLATS ARE ROTATABLY ADJUSTED IN OPPOSITE DIRECTIONS, AND THE WIDTH OF THE SLOTS FORMED BETWEEN SAID SLATS IS PROGRESSIVELY VARIED, THE PIVOT AXES
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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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |