Patent US3623409A successfully refreshed from Google Patents.
US3623409A
Expired / Lapsed
US
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Electrical or mechanical camera shutter
Assignee: Pentax Corp
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Filing: 1969-05-19
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Granted: 1971-11-30
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Expires: 1989-05-19
Abstract
Abstract A CAMERA SHUTTER INCLUDES AN ELECTRICAL AND A MECHANICAL TIMER. A LIGHT MEASURING NETWORK PROVIDED WITH A VISUAL INDICATOR FUNCTIONS AS A LIGHT CONTROLLED TIMING NETWORK WHICH TRIGGERS A SOLID STATE SWITCH CONTROLLING THE ELECTRICAL TIMER. A PAIR OF GAGED SWITCHES SELECTIVELY CONNECT A BATTERY TO THE MEASURING NETWORK ALONE, TO THE MEASURING AND SWITCH NETWORK, OR DEENERGIZE BOTH NETWORKS AND IS CONNECTED TO THE MECHANICAL SHUTTER SPEED CONTROL KNOB TO ENERGIZE BOTH NETWORKS WHEN THE KNOB IS AT A POSITION WHICH EITHER DISABLES THE MECHANICAL TIMER OF SETS IT AT A EXPOSURE LESS THAN THE MINIMUM ELECTRICALLY ACTUATED EXPOSURE TIME.
Inventors
- 👤 Naoyuki Uno
- 👤 Koichiro Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:17
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |