Patent US3821769A successfully refreshed from Google Patents.
US3821769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter release apparatus for camera
Assignee: Minolta Co Ltd
•
Filing: 1972-08-24
•
Granted: 1974-06-28
•
Expires: 1992-08-24
Abstract
Abstract AN APPARATUS COMPRISING AN EXPOSURE TIME CONTROLLING ELECTRIC CIRCUIT INCLUDING AN ELECTROMAGNET, A SHUTTER MECHANISM FOR ACTUATING A SHUTTER OPENING MEMBER UPON ENERGIZATION OF THE ELECTROMAGNET AND FOR ACTUATING A SHUTTER CLOSING MEMBER UPON DEENERGIZATION OF THE ELECTROMAGNET, A SIGNAL GENERATOR FOR PRODUCING AN ELECTRICAL SIGNAL TO RELEASE THE SHUTTER UPON CLOSING OF A SWITCH, A SIGNAL RECEIVER DETACHABLY MOUNTED ON THE CAMERA FOR RCEIVING THE ELECTRICAL SIGNAL WHEN MOUNTED ON THE CAMERA, AND A REMOTE CONTROL SWITCH TO BE CLOSED BY THE OUTPUT OF THE SIGNAL RECEIVER TO INITIATE THE EXPOSURE TIME CONTROLLING ELECTRIC CIRCUIT INTO OPERATION.
Inventors
- 👤 T Imura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:34
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |