Patent US3399307A successfully refreshed from Google Patents.
US3399307A
Expired / Lapsed
US
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Motion sensing exposure system for optical instruments
Assignee: Bell and Howell Co
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Filing: 1965-05-20
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Granted: 1968-08-27
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Expires: 1985-05-20
Abstract
No abstract record available.
Inventors
- 👤 Levin Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:53
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214; G03; G03B; G03B7/00; G03B7/003; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
IN AN AUTOMATIC LIGHT EXPOSURE SYSTEM, THE COMBINATION COMPRISING: (A) MOTION SENSING MEANS INCLUDING PHOTORESPONSIVE MEANS, FIRST OPTICAL MEANS HAVING ALTERNATELY DISPOSED AREAS OF DIFFERENT LIGHT TRANSMITTING CHARACTERISTICS WHICH IS LOCATED TO RECEIVE LIGHT FROM A SCENE AND TO TRANSMIT SAID LIGHT TO IMPINGE UPON SAID PHOTORESPONSIVE MEANS SUCH THAT RELATIVE TRANSVERSE MOVEMENT BETWEEN SAID FIRST OPTICAL MEANS AND AN OBJECT IN THE SCENE CAUSES A CYCLIC VARIATION IN THE LIGHT UPON SAID PHOTORESPONSIVE MEANS, A.C. AMPLIFIER MEANS CONNECTED TO SAID PHOTORESPONSIVE MEANS FOR PRODUCING AN A.C. SIGNAL WHOSE FREQUENCY VARIES WITH THE FREQUENCY OF SAID LIGHT CYCLIC VARIATION, PULSE FORMING MEANS RESPONSIVE TO SAID A.C. SIGNAL FOR GENERATING A TRAIN OF SUBSTANTIALLY EQUAL WIDTH-EQUAL AMPLITUDE ELECTRICAL PULSES WHOSE FREQUENCY VARIES
Claim 2
Dependent Claim
121 words
IN AN AUTOMATIC LIGHT EXPOSURE SYSTEM, THE COMBINATION COMPRISING: (A) MOTION SENSING MEANS INCLUDING PHOTORESPONSIVE MEANS, FIRST OPTICAL MEANS HAVING ALTERNATELY DISPOSED AREAS OF DIFFERENT LIGHT TRANSMITTING CHARACTERISTICS WHICH IS LOCATED TO RECEIVE LIGHT FROM A SCENE AND TO TRANSMIT SAID LIGHT TO IMPINGE UPON SAID PHOTORESPONSIVE MEANS SUCH THAT RELATIVE TRANSVERSE MOVEMENT BETWEEN SAID FIRST OPTICAL MEANS AND AN OBJECT IN THE SCENE CAUSES A CYCLIC VARIATION IN THE LIGHT UPON SAID PHOTORESPONSIVE MEANS, A.C. AMPLIFIER MEANS CONNECTED TO SAID PHOTORESPONSIVE MEANS FOR PRODUCING AN A.C. SIGNAL WHOSE FREQUENCY VARIES WITH THE FREQUENCY OF SAID LIGHT CYCLIC VARIATION, PULSE FORMING MEANS RESPONSIVE TO SAID A.C. SIGNAL FOR GENERATING A TRAIN OF SUBSTANTIALLY EQUAL WIDTH-EQUAL AMPLITUDE ELECTRICAL PULSES WHOSE FREQUENCY VARIES
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |