Patent US2721587A successfully refreshed from Google Patents.
US3100429A
Expired / Lapsed
US
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Photoelectric exposure metering device for photographic darkslide cameras
Assignee: Individual
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Filing: 1961-07-19
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Granted: 1963-08-13
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Expires: 1981-07-19
Abstract
No abstract record available.
Inventors
- 👤 Koch Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:41
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09977
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PHOTOELECTRIC EXPOSURE METERING DEVICE FOR DARKSLIDE CAMERAS ADAPTED FOR CONTROLLING THE IMAGE BY MEANS OF A GROUNDGLASS PLATE, COMPRISING AT LEAST ONE LIGHT PROTECTING SLIDE TO PREVENT LIGHT FROM ENTERING THE BACK OF THE CAMERA, A PHOTOELECTRIC CELL ARRANGED ADJACENT AND BEHIND THE SLIDE, AN INDICATING INSTRUMENT CONNECTED TO THE CELL, AND A HOUSING FOR THE CELL AND SLIDE AS A STRUCTURAL UNIT TO BE APPLIED TO THE CAMERA.
Claim 2
Dependent Claim
69 words
PHOTOELECTRIC EXPOSURE METERING DEVICE FOR DARKSLIDE CAMERAS ADAPTED FOR CONTROLLING THE IMAGE BY MEANS OF A GROUNDGLASS PLATE, COMPRISING AT LEAST ONE LIGHT PROTECTING SLIDE TO PREVENT LIGHT FROM ENTERING THE BACK OF THE CAMERA, A PHOTOELECTRIC CELL ARRANGED ADJACENT AND BEHIND THE SLIDE, AN INDICATING INSTRUMENT CONNECTED TO THE CELL, AND A HOUSING FOR THE CELL AND SLIDE AS A STRUCTURAL UNIT TO BE APPLIED TO THE CAMERA.
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) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |