Patent US3721167A successfully refreshed from Google Patents.
US3721167A
Expired / Lapsed
US
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Exposure value controlling apparatus
Assignee: Canon Inc
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Filing: 1969-10-29
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Granted: 1973-03-20
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Expires: 1989-10-29
Abstract
Abstract TIMING CIRCUIT ARRANGEMENTS FOR CONTROL OF CAMERA APERTURE OPENING AND SHUTTER SPEED WHEREIN A SINGLE TIMING CAPACITOR CONTROLS APERTURE OPENING IN ONE TIMING OPERATION DURING CHARGING THEREOF AND THEREAFTER CONTROLS SHUTTER SPEED IN A SECOND TIMING OPERATION DURING DISCHARGE THEREOF. D R A W I N G
Inventors
- 👤 M Ogiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:25
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |