Patent US3574444A successfully refreshed from Google Patents.
US3574444A
Expired / Lapsed
US
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Frame useful as lens support
Assignee: 3M Co
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Filing: 1968-07-09
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Granted: 1971-04-13
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Expires: 1988-07-09
Abstract
Abstract Undercut framelike members, e.g. lens holders, which are produced by casting in two-piece single-draw injection molds, have an inner undercut groove tapering from maximum depth at one centerline to zero depth at the centerline perpendicular thereto and provide for stable support and easy removal of the lens.
Inventors
- 👤 Richard D Hipp Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:55
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
The frame member of claim 1 wherein one surface of one of the V-shaped grooves is parallel with the other surface of the other of said groove at corresponding opposing points on said periphery.
Claim 2
Dependent Claim
54 words
The frame member of claim 1 wherein said inner periphery defines a circular open central area and wherein is included a narrow ledge extending around slightly less than one-half of said periphery and adjacent the plane of said undercut grooves, the ends of said ledge being located adjacent the opposing flattened inner rim surfaces.
Claim 3
Dependent Claim
55 words
A lens mount structure comprising a frame member as defined in claim 3 of cast rigid material and including a rigid lens fitting within said circular open central area and supported on said ledge, and a split ring lens-retainer removably fitting within said grooves and against said lens for urging said lens against said ledge.
Claim 4
Dependent Claim
25 words
A projection head assembly comprising two lens mount structures as defined in claim 4 disposed to place the two lenses approximately perpendicular to each other.
Claim 5
Dependent Claim
26 words
The projection head assembly of claim 5 wherein is included a plane mirror mounted within said assembly for reflecting light from one lens to the other.
References Cited (Backward Citations)
US1539830A
Cited
FR959284A
Cited
US1969852A
Cited
FR892308A
Cited
US2458817A
Cited
US2497147A
Cited
US2707418A
Cited
FR1063620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |