US3605600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination warning and shutter timing circuit
Assignee: OLYMPIA OPTICAL CO Ltd
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Filing: 1968-10-21
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Granted: 1971-09-20
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Expires: 1988-10-21
Abstract
Abstract A CAMER SHUTTER SYSTEM HAVING A CONTROL CIRCUIT CAPABLE OF TWO OPERATIONAL MODES. IN ONE MODE THE CONTROL CIRCUIT RESPONDS TO AN A.C. SIGNAL THAT EXCEEDS A THRESHOLD VOLTAGE REPRESENTING EXCESSIVE SUBJECT BRIGHTNESS AS DETECTED BY A PHOTOELECTRIC DEVICE. THE SIGNAL ENERGIZES A WARNING INDICATOR. IN A SECOND MODE THE CONTROL CIRCUIT SERVES AS A TIMING CIRCUIT WHICH OPERATES FROM A D.C. SOURCE FOR ELECTROMAGNETICALLY CLOSING THE CAMERA SHUTTER AFTER A TIME CONSTANT INTERVAL DEPENDENT UPON THE CIRCUIT RESISTANCE OF THE SUBJECT MONITORING PHOTOELECTRIC DEVICE.
Inventors
- 👤 Tadashi Morokuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:20
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |