US3147680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic light measuring device
Assignee: Eastman Kodak Co
•
Filing: 1963-05-07
•
Granted: 1964-09-08
•
Expires: 1983-05-07
Abstract
No abstract record available.
Inventors
- 👤 Allen G Stimson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
IN A PHOTOGRAPHIC LIGHT MEASURING DEVICE HAVING (A) AN ELECTRIC-TO-MECHANICAL TRANSDUCER INCLUDING A MOVABLE MEMBER, (B) A VARIABLE IMPEDANCE ELECTRICALLY IN CIRCUIT WITH SAID TRANSDUCER FOR REGULATING THE SENSITIVITY OF SAID TRANSDUCER, AND (C) MEANS INCLUDING AN ILLUMINATABLE PHOTORESPONSIVE ELEMENT NORMALLY IN ELECTRIC CIRCUIT WITH SAID TRANSDUCER FOR GENERATING AN ELECTRIC SIGNAL CORRELATED TO ILLUMINATION OF SAID ELEMENT AND IN RESPONSE TO WHICH SAID MOVABLE MEMBER IS POSITIONABLE, MEANS FOR SELECTIVELY ADJUSTING SAID VARIABLE IMPEDANCE TO OBTAIN A DESIRED TRANSDUCER SENSITIVITY, SAID MEANS COMPRISING: (1) MEANS FOR GENERATING A PREDETERMINED CALIBRATING SIGNAL; (2) MEANS SELECTIVELY OPERABLE FOR ENERGIZING SAID TRANSDUCER RESPONSIVELY TO SAID CALIBRATING SIGNAL AND INDEPENDENTLY OF THE SIGNAL FROM SAID PHOTORESPONSIVE ELEMENT; (3) MEANS COOPERABLE WITH SAID MOVABLE MEMBER AND OPERATIVE UPON ENERGIZATION OF SAID TRANSDUCER BY SAID CALIBRATING SIGNAL FOR INDICATING SENSITIVITY VALUES CORRESPONDING TO POSITONS OF SAID MEMBER; AND (4) MEANS FOR VARYING SAID IMPEDANCE TO POSITION SAID MEMBER TO INDICATE A DESIRED SENSITIVITY.
Claim 2
Dependent Claim
158 words
IN A PHOTOGRAPHIC LIGHT MEASURING DEVICE HAVING (A) AN ELECTRIC-TO-MECHANICAL TRANSDUCER INCLUDING A MOVABLE MEMBER, (B) A VARIABLE IMPEDANCE ELECTRICALLY IN CIRCUIT WITH SAID TRANSDUCER FOR REGULATING THE SENSITIVITY OF SAID TRANSDUCER, AND (C) MEANS INCLUDING AN ILLUMINATABLE PHOTORESPONSIVE ELEMENT NORMALLY IN ELECTRIC CIRCUIT WITH SAID TRANSDUCER FOR GENERATING AN ELECTRIC SIGNAL CORRELATED TO ILLUMINATION OF SAID ELEMENT AND IN RESPONSE TO WHICH SAID MOVABLE MEMBER IS POSITIONABLE, MEANS FOR SELECTIVELY ADJUSTING SAID VARIABLE IMPEDANCE TO OBTAIN A DESIRED TRANSDUCER SENSITIVITY, SAID MEANS COMPRISING: (1) MEANS FOR GENERATING A PREDETERMINED CALIBRATING SIGNAL; (2) MEANS SELECTIVELY OPERABLE FOR ENERGIZING SAID TRANSDUCER RESPONSIVELY TO SAID CALIBRATING SIGNAL AND INDEPENDENTLY OF THE SIGNAL FROM SAID PHOTORESPONSIVE ELEMENT; (3) MEANS COOPERABLE WITH SAID MOVABLE MEMBER AND OPERATIVE UPON ENERGIZATION OF SAID TRANSDUCER BY SAID CALIBRATING SIGNAL FOR INDICATING SENSITIVITY VALUES CORRESPONDING TO POSITONS OF SAID MEMBER; AND (4) MEANS FOR VARYING SAID IMPEDANCE TO POSITION SAID MEMBER TO INDICATE A DESIRED SENSITIVITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |