Patent US3282179A successfully refreshed from Google Patents.
US3282179A
Expired / Lapsed
US
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Use of photoconductive cell as attenuator
Assignee: Eastman Kodak Co
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Filing: 1964-05-20
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Granted: 1966-11-01
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Expires: 1984-05-20
Abstract
No abstract record available.
Inventors
- 👤 Alien G Stimson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:04
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/08; G03B7/00; G03B7/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN AN APPARATUS FOR CONTROLLING THE EXPOSURE OF A CAMERA INCLUDING A PHOTOELECTRIC CIRCUIT, AN ELECTRIC MEASURING INSTRUMENT, A BATTERY FOR ENERGIZING SAID INSTRUMENT, AND A FIRST PHOTORESISTOR ILLUMINATABLE BY SCENE LIGHT AND CONNECTED IN CIRCUIT WITH SAID BATTERY FOR CONTROLLING ENERGIZATION OF SAID INSTRUMENT AS A FUNCTION OF THE ILLUMINATION OF SAID PHOTORESISTOR, MEANS FOR ADJUSTING THE SENSITIVITY OF SAID CIRCUIT, COMPRISING, IN COMBINATION: A LAMP; MEANS FOR ENERGIZING SAID LAMP; A SECOND PHOTORESISTOR, ILLUMINATABLE BY SAID LAMP AND CONNECTED IN CIRCUIT WITH SAID INSTRUMENT; AT LEAST ONE VARIABLE OPTICAL ATTENUATOR INTERPOSED BETWEEN SAID LAMP AND SAID SECOND PHOTORESISTOR; AND MEANS FOR VARYING SAID OPTICAL ATTENUATOR IN ACCORDANCE WITH CHANGES IN AN EXPOSURE FACTOR.
Claim 2
Dependent Claim
115 words
IN AN APPARATUS FOR CONTROLLING THE EXPOSURE OF A CAMERA INCLUDING A PHOTOELECTRIC CIRCUIT, AN ELECTRIC MEASURING INSTRUMENT, A BATTERY FOR ENERGIZING SAID INSTRUMENT, AND A FIRST PHOTORESISTOR ILLUMINATABLE BY SCENE LIGHT AND CONNECTED IN CIRCUIT WITH SAID BATTERY FOR CONTROLLING ENERGIZATION OF SAID INSTRUMENT AS A FUNCTION OF THE ILLUMINATION OF SAID PHOTORESISTOR, MEANS FOR ADJUSTING THE SENSITIVITY OF SAID CIRCUIT, COMPRISING, IN COMBINATION: A LAMP; MEANS FOR ENERGIZING SAID LAMP; A SECOND PHOTORESISTOR, ILLUMINATABLE BY SAID LAMP AND CONNECTED IN CIRCUIT WITH SAID INSTRUMENT; AT LEAST ONE VARIABLE OPTICAL ATTENUATOR INTERPOSED BETWEEN SAID LAMP AND SAID SECOND PHOTORESISTOR; AND MEANS FOR VARYING SAID OPTICAL ATTENUATOR IN ACCORDANCE WITH CHANGES IN AN EXPOSURE FACTOR.
References Cited (Backward Citations)
US3073220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |