Patent US3845699A successfully refreshed from Google Patents.
US3845699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact single lens reflex viewing system for cameras
Assignee: Individual
•
Filing: 1972-05-01
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Granted: 1974-11-05
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Expires: 1992-05-01
Abstract
Abstract This invention relates to the improvements to the single lens reflex viewing system used in cameras.
Inventors
- 👤 C Feng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:45
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
A camera with compact viewing system comprising a camera body with objective lens, a one way reflector behind said lens, a shutTer curtain with reflecting surface behind said reflector, a 90* corner reflector to receive light reflected by said curtain and first reflector, and an ocular.
Claim 2
Dependent Claim
46 words
A camera with compact viewing system comprising a camera body with objective lens, a one way reflector behind said lens, a shutTer curtain with reflecting surface behind said reflector, a 90* corner reflector to receive light reflected by said curtain and first reflector, and an ocular.
Claim 3
Dependent Claim
20 words
A camera as defined in claim 1 with a one-way transparent window between the first reflector and the corner reflector.
Claim 4
Dependent Claim
26 words
A camera as defined in claim 2 further comprising means of adjustment for individual eyes, in the form of a moveable ocular and a marker flag.
Claim 5
Dependent Claim
35 words
A camera as defined in claim 3, the shutter being removable for recording systems in which the image of the object being photographed may be formed on a diffused surface for both viewing and exposure.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |