US3618449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viewfinder mounting on single-lens reflex cameras
Assignee: Ricoh Co Ltd
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Filing: 1969-09-23
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Granted: 1971-11-09
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Expires: 1989-09-23
Abstract
Abstract A VIEWFINDER FOR SINGLE-LENS REFLEX CAMERAS UPON WHICH A PENTA-ROOF TYPE REFLECTING MIRROR MAY BE MOUNTED THROUGH A MOUNTING MEMBER HAVING PROVIDING EDGES ALONG THE SIDE WALLS OF THE MIRROR FOR MOUNTING. THE MAIN BODY OF THE MIRROR MAY BE CORRECTLY POSITIONED RELATIVE TO THE CAMERA BODY AND THE MIRROR IS SECURELY HELD IN POSITION AT THE PORTION EXTERIOR OF THE MAIN BODY OF THE MIRROR SO THAT NO FORCE IS DIRECTLY APPLIED TO THE REFLECTING MIRROR UPON MOUNTING, THEREBY ELIMINATING THE DISTORTION THEREOF.
Inventors
- 👤 Kenji Hiruma
- 👤 Sadanao Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:06
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |