Patent US3719132A successfully refreshed from Google Patents.
US3719132A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptor for adjustment of visibility in viewfinder of a photographic camera
Assignee: Pentax Corp
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Filing: 1971-07-21
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Granted: 1973-03-06
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Expires: 1991-07-21
Abstract
Abstract An adaptor for adjustment of visibility in the viewfinder of a photographic camera. A lens provides adjustment of the visibility. The lens has a pair of locking projections on the periphery thereof disposed in opposition to each other. A slit in the lens extends adjacent to the portion of the periphery from which one of the projections projects and provides a reduced resiliency to the lens allowing the projections to be collapsed inwardly. A viewfinder eyepiece frame has an opening. A step-like portion in the opening serves to expand the opening. At least two locking grooves are formed on opposing portions of the opening such that the projections are engaged into the grooves.
Inventors
- 👤 F Urano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:13
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/02; G03B13/10; G03B13/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
121 words
An adaptor for adjustment of visibility in the view finder of a photographic camera comprising: a lens for adjustment of visibility comprising a pair of locking projections on the periphery thereof disposed in opposition to each other, a slit in said lens extending adjacent to the portion of said periphery from which one of said projections projects providing a reduced resiliency to said lens allowing said projections to be relatively inwardly collapsed; and a view finder eyepiece frame having an opening, a step-like portion in said opening serving to expand said opening and at least two locking grooves formed on opposing portions of said opening, said lens being mounted in said opening such that said projections are engaged into said grooves.
Claim 2
Dependent Claim
121 words
An adaptor for adjustment of visibility in the view finder of a photographic camera comprising: a lens for adjustment of visibility comprising a pair of locking projections on the periphery thereof disposed in opposition to each other, a slit in said lens extending adjacent to the portion of said periphery from which one of said projections projects providing a reduced resiliency to said lens allowing said projections to be relatively inwardly collapsed; and a view finder eyepiece frame having an opening, a step-like portion in said opening serving to expand said opening and at least two locking grooves formed on opposing portions of said opening, said lens being mounted in said opening such that said projections are engaged into said grooves.
Claim 3
Dependent Claim
121 words
An adaptor for adjustment of visibility in the view finder of a photographic camera comprising: a lens for adjustment of visibility comprising a pair of locking projections on the periphery thereof disposed in opposition to each other, a slit in said lens extending adjacent to the portion of said periphery from which one of said projections projects providing a reduced resiliency to said lens allowing said projections to be relatively inwardly collapsed; and a view finder eyepiece frame having an opening, a step-like portion in said opening serving to expand said opening and at least two locking grooves formed on opposing portions of said opening, said lens being mounted in said opening such that said projections are engaged into said grooves.
Claim 4
Dependent Claim
121 words
An adaptor for adjustment of visibility in the view finder of a photographic camera comprising: a lens for adjustment of visibility comprising a pair of locking projections on the periphery thereof disposed in opposition to each other, a slit in said lens extending adjacent to the portion of said periphery from which one of said projections projects providing a reduced resiliency to said lens allowing said projections to be relatively inwardly collapsed; and a view finder eyepiece frame having an opening, a step-like portion in said opening serving to expand said opening and at least two locking grooves formed on opposing portions of said opening, said lens being mounted in said opening such that said projections are engaged into said grooves.
Claim 5
Dependent Claim
15 words
An adaptor according to claim 1 wherein the lens is formed of an elastic material.
Claim 6
Dependent Claim
32 words
An adaptor according to claim 1 wherein the lens comprises a peripheral portion adjacent each projection and wherein said slit is substantially parallel to said peripheral portion adjacent one of said projections.
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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |