US3156171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic diaphragm control device for photographic camera
Assignee: Individual
•
Filing: 1962-11-14
•
Granted: 1964-11-10
•
Expires: 1982-11-14
Abstract
No abstract record available.
Inventors
- 👤 Sakaki Yoshinobu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:15
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN AN AUTOMATIC DIAPHRAGM CONTROL DEVICE FOR A PHOTOGRAPHIC CAMERA COMPRISING DIAPHRAGM MEANS, A SOURCE OF ELECTRIC CURRENT, AND A GALVANOMETER COUPLED TO SAID DIAPHRAGM AND TO SAID SOURCE OF CURRENT AND DRIVEN BY SAID SOURCE OF ELECTRIC CURRENT TO CONTROL THE DIAPHRAGM MEANS, THE COMBINATION OF A PHOTOCONDUCTIVE MEANS FOR CONTROLLING A FLOW OF CURRENT THROUGH THE GALVANOMETER IN ACCORDANCE WITH AN AMOUNT OF LIGHT FALLING UPON THE SAME, A VARIABLE RESISTANCE, AND A FIXED RESISTANCE AND A COMMON SWITCHING MEANS CONNECTED IN A CIRCUIT WITH SAID GALVANOMETER AND SAID SOURCE OF ELECTRIC CURRENT, SAID COMMON SWITCHING MEANS SELECTIVELY CONNECTING SAID VARIABLE RESISTANCE, SAID PHOTOCONDUCTIVE MEANS AND SAID FIXED RESISTANCE TO SAID GALVANOMETER, RESILIENT MEANS, AND MANUAL HOLDING MEANS COUPLED TO SAID
Claim 2
Dependent Claim
123 words
IN AN AUTOMATIC DIAPHRAGM CONTROL DEVICE FOR A PHOTOGRAPHIC CAMERA COMPRISING DIAPHRAGM MEANS, A SOURCE OF ELECTRIC CURRENT, AND A GALVANOMETER COUPLED TO SAID DIAPHRAGM AND TO SAID SOURCE OF CURRENT AND DRIVEN BY SAID SOURCE OF ELECTRIC CURRENT TO CONTROL THE DIAPHRAGM MEANS, THE COMBINATION OF A PHOTOCONDUCTIVE MEANS FOR CONTROLLING A FLOW OF CURRENT THROUGH THE GALVANOMETER IN ACCORDANCE WITH AN AMOUNT OF LIGHT FALLING UPON THE SAME, A VARIABLE RESISTANCE, AND A FIXED RESISTANCE AND A COMMON SWITCHING MEANS CONNECTED IN A CIRCUIT WITH SAID GALVANOMETER AND SAID SOURCE OF ELECTRIC CURRENT, SAID COMMON SWITCHING MEANS SELECTIVELY CONNECTING SAID VARIABLE RESISTANCE, SAID PHOTOCONDUCTIVE MEANS AND SAID FIXED RESISTANCE TO SAID GALVANOMETER, RESILIENT MEANS, AND MANUAL HOLDING MEANS COUPLED TO SAID
References Cited (Backward Citations)
DE1056470B
Cited
FR1235184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-10 | 1968-05-11 | 1968-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-10 | 1972-05-11 | 1972-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-10 | 1976-05-11 | 1976-11-10 | $7700.00 | Window Closed / Lapsed |