US3177762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric exposure meter capable of reading picture contrast
Assignee: Pentax Corp
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Filing: 1962-06-20
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Granted: 1965-04-13
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Expires: 1982-06-20
Abstract
No abstract record available.
Inventors
- 👤 Ito Shoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:57
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
IN AN ELECTRIC EXPOSURE METER HAVING AN OPTICAL SYSTEM WITH AN EYE-PIECE THROUGH WHICH A SUBJECT TO BE PHOTOGRAHPED CAN BE VIEWED, A PHOTOELECTRIC ELEMENT POSITIONED TO RECEIVE LIGHT THROUGH THE OPTICAL SYSTEM FROM ONLY A DESIRED SMALL AREA OF THE SUBJECT BEING VIEWED, MEANS IN THE OPTICAL SYSTEM VISIBLE THROUGH SAID EYE-PIECE TO INDICATE THE SMALL AREA OF THE SUBJECT FROM WHICH THE PHOTOELECTRIC ELEMENT RECEIVES LIGHT, MEANS CONTROLLED BY SAID PHOTOELECTRIC ELEMENT, INCLUDING AN LV SCALE, TO PROVIDE AN INDICATION ALSO VISIBLE THROUGH SAID EYE-PIECE OF THE LIGHT VALUE OF SAID SMALL AREA OF THE SUBJECT; THE IMPROVEMENT COMPRISING A CONTRAST SCALE ON A MEMBER WHICH IS JOINED TO A PART OF THE EXPOSURE METER AND RELATIVELY MOVABLE WITH RESPECT TO SAID PART IN THE DIRECTION ALONG AN ADJACENT LV SCALE, SAID CONTRAST SCALE INCLUDING AN INDEX POINT AND GRADUATIONS EXTENDING IN OPPOSITE DIRECTIONS FROM SAID INDEX POINT TO THE ENDS OF SAID CONTRAST SCALE, SAID ENDS OF THE CURRENT SCALE BEING SPACED APART ALONG SAID ADJACENT LV SCALE TO LIE OPPOSITE LIGHT
Claim 2
Dependent Claim
175 words
IN AN ELECTRIC EXPOSURE METER HAVING AN OPTICAL SYSTEM WITH AN EYE-PIECE THROUGH WHICH A SUBJECT TO BE PHOTOGRAHPED CAN BE VIEWED, A PHOTOELECTRIC ELEMENT POSITIONED TO RECEIVE LIGHT THROUGH THE OPTICAL SYSTEM FROM ONLY A DESIRED SMALL AREA OF THE SUBJECT BEING VIEWED, MEANS IN THE OPTICAL SYSTEM VISIBLE THROUGH SAID EYE-PIECE TO INDICATE THE SMALL AREA OF THE SUBJECT FROM WHICH THE PHOTOELECTRIC ELEMENT RECEIVES LIGHT, MEANS CONTROLLED BY SAID PHOTOELECTRIC ELEMENT, INCLUDING AN LV SCALE, TO PROVIDE AN INDICATION ALSO VISIBLE THROUGH SAID EYE-PIECE OF THE LIGHT VALUE OF SAID SMALL AREA OF THE SUBJECT; THE IMPROVEMENT COMPRISING A CONTRAST SCALE ON A MEMBER WHICH IS JOINED TO A PART OF THE EXPOSURE METER AND RELATIVELY MOVABLE WITH RESPECT TO SAID PART IN THE DIRECTION ALONG AN ADJACENT LV SCALE, SAID CONTRAST SCALE INCLUDING AN INDEX POINT AND GRADUATIONS EXTENDING IN OPPOSITE DIRECTIONS FROM SAID INDEX POINT TO THE ENDS OF SAID CONTRAST SCALE, SAID ENDS OF THE CURRENT SCALE BEING SPACED APART ALONG SAID ADJACENT LV SCALE TO LIE OPPOSITE LIGHT
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |