Patent US3924786A successfully refreshed from Google Patents.
US3924786A
Expired / Lapsed
US
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Photographic lens safety ring
Assignee: Individual
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Filing: 1974-02-14
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Granted: 1975-12-09
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Expires: 1994-02-14
Abstract
Abstract A photographic lens safety ring is constructed in the form of a cylindrical member which has a male thread on one end thereof and a female thread on the other end, one thread being adapted to be screwed into the filter mount threads on the front of a lens and the other thread being adapted to receive an accessory such as filters, lens hoods and the like. The member is provided with a securing means on the periphery thereof that is free to rotate about the cylindrical member and a lanyard, tether line, or other device may be attached to this securing means in such a way that it can be retained on a person''s clothing or the like.
Inventors
- 👤 Richard W Duquette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:06
CPC Classifications
A; A45; A45F; A45F5/00; A45F5/02; G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; A45F5/1533; Y; Y10; Y10S; Y10S224/00; Y10S224/908; Y10T; Y10T24/00; Y10T24/13; Y10T24/1397
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
208 words
A photographic lens safety ring for interchangeable lenses having a female threaded section adjacent the objective thereof comprising a cylindrical member having an outer wall of stepped formation defining two diameter portions and an inner wall having two diameters, a band having an anchor means thereon, said band being received about the larger diameter portion of said outer wall, groove means defined on said portion for retaining the band on said outer wall portion for rotation thereabout in slidable relation therewith, a tether line attached to said anchor means and having its other end provided with means to attach to the body of the camera user, said outer wall having a threaded surface extending inwardly from the one edge of said member on the smaller diameter portion, the inner wall of said cylindrical member having a threaded surface extending inwardly from the other edge of the member in the larger diameter, said threaded surfaces being of the same mating size of pitch and diameter, whereby an accessory normally received in the threaded section of the lens of a camera is selectively received in the inner threaded portion of the safety ring while the outer threaded portion may inturn be received in the threaded section of the camera lens.
Claim 2
Dependent Claim
208 words
A photographic lens safety ring for interchangeable lenses having a female threaded section adjacent the objective thereof comprising a cylindrical member having an outer wall of stepped formation defining two diameter portions and an inner wall having two diameters, a band having an anchor means thereon, said band being received about the larger diameter portion of said outer wall, groove means defined on said portion for retaining the band on said outer wall portion for rotation thereabout in slidable relation therewith, a tether line attached to said anchor means and having its other end provided with means to attach to the body of the camera user, said outer wall having a threaded surface extending inwardly from the one edge of said member on the smaller diameter portion, the inner wall of said cylindrical member having a threaded surface extending inwardly from the other edge of the member in the larger diameter, said threaded surfaces being of the same mating size of pitch and diameter, whereby an accessory normally received in the threaded section of the lens of a camera is selectively received in the inner threaded portion of the safety ring while the outer threaded portion may inturn be received in the threaded section of the camera lens.
Claim 3
Dependent Claim
45 words
A photographic lens safety ring as in claim 1 wherein said groove means is defined by protrusiOns extending from said outer wall, said protrusions being aligned in two spaced parallel planes, said band being received between said protrusions in slidable engagement around said outer wall.
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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |