US3610122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter timing system
Assignee: Polaroid Corp
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Filing: 1969-03-05
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Granted: 1971-10-05
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Expires: 1989-03-05
Abstract
Abstract AN EXPOSURE CONTROL SYSTEM FOR REGULATING THE EXPOSURE INTERVAL OF A CAMERA IN COOPERATION WITH FLASH UNITS, PARTICULARLY THOSE OF THE ELECTRONIC OR STROBE VARIETY. THE SYSTEM UTILIZES TWO BATTERY POWER SOURCES, ONE TO POWER THE LIGHTING UNIT AND THE OTHER TO POWER THE SHUTTER INTERVAL TIMING CIRCUIT. THE RESPONSE OF THE TIMING CIRCUIT IS ADJUSTED BY SELECTIVELY INSERTING AN ELECTRIC SIGNAL FROM THE LIGHTING UNIT BATTEY SOURCE INTO THE SHUTTER TIMING CIRCUIT. A DIODE IS USED TO ISOLATE THE TIMING CIRCUIT FROM THE ELECTRONIC FLASH CIRCUIT WHEN THE LATTER IS NOT BEING UTILIZED.
Inventors
- 👤 Conrad H Biber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B9/00; G03B9/70
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |