USRE27867E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation-sensitive camera shutter and aperture control systems
Assignee: —
•
Filing: 1972-05-05
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Granted: 1974-01-01
•
Expires: 1992-05-05
Abstract
Abstract A VOLTAGE THAT VARIES LINERALY WITH LIGHT INTENSITY VARIATION IS GENERATED BY AN AMPLIFIER HAVING A DIFFERENTIAL INPUT STAGE CONNECTED TO A LIGHT RESPONSIVE DIODE. TWO HIGH GAIN TANSISTORS ARE INCLUDED IN THE DIFFERENTIAL INPUT STAGE TO PROVIDE AMPLIFICATON OF THE SIGNAL CURRENTS OF THE LIGHT RESPONSIVE DIODE. IN A CAMERA SHUTTER AND APERTURE CONTROL SYSTEM, THE LINEARLY VARYING LIGHT INTENSITY VOLTAGE IS AMPLIFIED TO CONTROL TWO TRESHOLD DETECTOR CIRCUITS. AN INHIBITING CIRCUIT PREVENTS ONE OF THE THREHOLD DETECTOR CIRCUITS FROM RESPNDING TO THE LIGHT INTENSITY VOLTAGE UNTIL THE FIRST THRESHOLD CIRCUIT HAS COMPLETED ITS DESIRED OPERATION.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:20
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |