Patent US3080803A successfully refreshed from Google Patents.
US3080803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light measuring system
Assignee: Pentax Corp
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Filing: 1961-09-07
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Granted: 1963-03-12
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Expires: 1981-09-07
Abstract
No abstract record available.
Inventors
- 👤 Uno Naoyuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:41
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/099; G03B7/0993; G03B7/0997; G03B7/09971; G03B7/09977
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A SINGLE LENS REFLEX CAMERA COMPRISING AN OBJECTIVE LENS, A MIRROR DISPOSED REARWARDLY OF SAID OBJECTIVE LENS AND SWINGABLE BETWEEN AN ADVANCED POSITION INTERCEPTING THE OPTICAL AXIS OF SAID OBJECTIVE LENS AT AN OBLIQUE ANGLE THERETO AND A RETRACTED POSITION, A PIVOTED LEVER HAVING A FREE END SWINGABLE BETWEEN AN ADVANCED POSITION IN THE PATH OF LIGHT REFLECTED BY SAID MIRROR IN ITS ADVANCED POSITION AND A RETRACTED POSITION, A PHOTOSENSITIVE ELEMENT MOUNTED ON SAID LEVER FREE END AND MOVABLE THEREWITH BETWEEN SAID ADVANCED AND RETRACTED POSITIONS AND DIRECTED TOWARD SAID MIRROR WHEN IN AN ADVANCED POSITION, AND A LIGHT INTERCEPTING SHIELD MOUNTED ON SAID LEVER FREE END AND BETWEEN SAID PHOTOSENSITIVE ELEMENT AND SAID OBJECTIVE LENS TO SHIELD SAID PHOTOSENSITIVE ELEMENT WHEN IN ITS ADVANCED POSITION FROM THE DIRECT RAYS PASSING THROUGH SAID OBJECTIVE LENS.
Claim 2
Dependent Claim
136 words
A SINGLE LENS REFLEX CAMERA COMPRISING AN OBJECTIVE LENS, A MIRROR DISPOSED REARWARDLY OF SAID OBJECTIVE LENS AND SWINGABLE BETWEEN AN ADVANCED POSITION INTERCEPTING THE OPTICAL AXIS OF SAID OBJECTIVE LENS AT AN OBLIQUE ANGLE THERETO AND A RETRACTED POSITION, A PIVOTED LEVER HAVING A FREE END SWINGABLE BETWEEN AN ADVANCED POSITION IN THE PATH OF LIGHT REFLECTED BY SAID MIRROR IN ITS ADVANCED POSITION AND A RETRACTED POSITION, A PHOTOSENSITIVE ELEMENT MOUNTED ON SAID LEVER FREE END AND MOVABLE THEREWITH BETWEEN SAID ADVANCED AND RETRACTED POSITIONS AND DIRECTED TOWARD SAID MIRROR WHEN IN AN ADVANCED POSITION, AND A LIGHT INTERCEPTING SHIELD MOUNTED ON SAID LEVER FREE END AND BETWEEN SAID PHOTOSENSITIVE ELEMENT AND SAID OBJECTIVE LENS TO SHIELD SAID PHOTOSENSITIVE ELEMENT WHEN IN ITS ADVANCED POSITION FROM THE DIRECT RAYS PASSING THROUGH SAID OBJECTIVE LENS.
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) | 1966-03-11 | 1966-09-10 | 1967-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-11 | 1970-09-10 | 1971-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-11 | 1974-09-10 | 1975-03-12 | $7700.00 | Window Closed / Lapsed |