Patent US3720149A successfully refreshed from Google Patents.
US3720149A
Expired / Lapsed
US
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Light shielding device for interchangeable lens camera
Assignee: Nikon Corp
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Filing: 1969-04-07
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Granted: 1973-03-13
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Expires: 1989-04-07
Abstract
Abstract A LIGHT SHIELDING DEVICE FOR CAMERAS WITH INTERCHANGEABLE LENSES WHICH PREVENTS THE LIGHT ENTERING THE CAMERA BODY THROUGH THE LENS MOUNTING OPENING FROM REACHING THE SHUTTER CURTAIN WHEN THERE IS NO LENS MOUNTED IN THE CAMERA BODY. A LIGHT SHIELDING PLATE MOUNTED WITHIN THE CAMERA BODY IS BIASED TO A POSITION INTERPOSED BETWEEN THE LENS MOUNTING OPENING AND THE SHUTTER CURTAIN. A CAM MEANS ON EACH OF THE INTERCHANGEABLE LENSES FOR THE CAMERA ACTUATES AN INTERLOCKING DEVICE WITHIN THE CAMERA TO WITHDRAW THE LIGHT SHIELDING PLATE FROM BETWEEN THE LENS AND THE SHUTTER CURTAIN AS THE LENS IS INSTALLED IN THE CAMERA BODY. D R A W I N G
Inventors
- 👤 S Ishizaka
- 👤 M Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:50
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B17/00; G03B17/02; G03B17/12; G03B17/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |