US3407716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure control device for photographic cameras
Assignee: Agfa Gevaert AG
•
Filing: 1966-03-10
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Granted: 1968-10-29
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Expires: 1986-03-10
Abstract
No abstract record available.
Inventors
- 👤 Wick Richard
- 👤 Bestenreiner Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:42
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A PHOTOGRAPHIC CAMERA, A SHUTTER MOVABLE BETWEEN OPEN AND CLOSED POSITIONS; BLOCKING MEANS MOVABLE INTO ENGAGEMENT WITH SAID SHUTTER TO HOLD THE LATTER IN OPEN POSITION; AND AN EXPOSURE CONTROL FOR DISENGAGING SAID BLOCKING MEANS, COMPRISING A LIGHT-SENSITIVE RESISTOR EXPOSED TO INCIDENT LIGHT, A SOURCE OF ELECTRICAL ENERGY CONNECTED IN SERIES WITH SAID RESISTOR, A CAPACITOR CONNECTED IN SERIES WITH SAID RESISTOR AND SAID SOURCE SO AS TO BE CHARGED AND DISCHARGED BY CURRENT FLOWING THROUGH SAID RESISTOR, AN ELECTROMAGNET OPERATIVE TO PERMIT DISENGAGEMENT OF SAID BLOCKING MEANS IN ONE CONDITION OF ENERGIZA-
Claim 2
Dependent Claim
94 words
IN A PHOTOGRAPHIC CAMERA, A SHUTTER MOVABLE BETWEEN OPEN AND CLOSED POSITIONS; BLOCKING MEANS MOVABLE INTO ENGAGEMENT WITH SAID SHUTTER TO HOLD THE LATTER IN OPEN POSITION; AND AN EXPOSURE CONTROL FOR DISENGAGING SAID BLOCKING MEANS, COMPRISING A LIGHT-SENSITIVE RESISTOR EXPOSED TO INCIDENT LIGHT, A SOURCE OF ELECTRICAL ENERGY CONNECTED IN SERIES WITH SAID RESISTOR, A CAPACITOR CONNECTED IN SERIES WITH SAID RESISTOR AND SAID SOURCE SO AS TO BE CHARGED AND DISCHARGED BY CURRENT FLOWING THROUGH SAID RESISTOR, AN ELECTROMAGNET OPERATIVE TO PERMIT DISENGAGEMENT OF SAID BLOCKING MEANS IN ONE CONDITION OF ENERGIZA-
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |