US3668381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prismatic light louver
Assignee: Individual
•
Filing: 1970-02-02
•
Granted: 1972-06-06
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Expires: 1990-02-02
Abstract
Abstract A light transmitting louver for use as a ceiling panel in a luminous ceiling or as a lens in a lighting fixture. The louver has a planar member adapted to be positioned adjacent a light source and a plurality of walls extending from the member on the side opposite the light source to define a symmetrical closed cell system. Within the peripheral extent of each cell and on a surface of the planar member are prisms which extend generally symmetrical to the cell axis and with the cell wall. The individual prisms are asymmetrical in cross-section, i.e., the angular slope of the respective surfaces of each prism is different.
Inventors
- 👤 Robert A D Schwartz
- 👤 Rodney P Osterberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:28
CPC Classifications
F; F21; F21V; F21V3/00; F21V5/00; F21V5/02; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
A light louver including a generally planar rigid membrane, wall means formed integrally with said membrane and extending normal from one surface of said membrane and defining a plurality of adjacent cells, each of said cells being generally symmetrical about the central axis thereof, a surface of said membrane being provided with a plurality of prisms disposed within the peripheral confines of the respective cells, said prismatic portion of said membrane being polished, said wall means being frosted to thereby define a lusterless surface compared to said polished prismatic surface, said prisms extending lineally symmetrically about each cell axis and symmetrically with the wall means defining the respective cell, and said prisms extending uniformly across substantially the entire peripheral extent of each cell.
Claim 2
Dependent Claim
123 words
A light louver including a generally planar rigid membrane, wall means formed integrally with said membrane and extending normal from one surface of said membrane and defining a plurality of adjacent cells, each of said cells being generally symmetrical about the central axis thereof, a surface of said membrane being provided with a plurality of prisms disposed within the peripheral confines of the respective cells, said prismatic portion of said membrane being polished, said wall means being frosted to thereby define a lusterless surface compared to said polished prismatic surface, said prisms extending lineally symmetrically about each cell axis and symmetrically with the wall means defining the respective cell, and said prisms extending uniformly across substantially the entire peripheral extent of each cell.
Claim 3
Dependent Claim
27 words
A louver as set forth in claim 1 in which each of said prisms has a pair of asymmetrical surfaces extending from a surface of said membrane.
Claim 4
Dependent Claim
16 words
A louver as set forth in claim 1 in which each of said cells is circular.
Claim 5
Dependent Claim
16 words
A louver as set forth in claim 1 in which each of said cells is square.
Claim 6
Dependent Claim
36 words
A louver as set forth in claim 1 in which said prisms are provided on the surface of said membrane from which said wall means extend, and each of said prisms has the same cross-sectional configuration.
Claim 7
Dependent Claim
37 words
A louver as set forth in claim 2 in which the prism surface facing said cell axis has a greater slope relative to said axis than the other prism surface facing said wall means defining such cell.
Claim 8
Dependent Claim
48 words
A louver as set forth in claim 3 in which a plurality of said prisms are defined in adjacent concentric relation within each cell, and each of said prisms has a pair of asymmetrical surfaces extending from the surface of said membrane from which said wall means extend.
Claim 9
Dependent Claim
54 words
A louver as set forth in claim 7 in which one of each of said prism surfaces faces the central axis of said cell and the other of each of said prism surfaces faces said wall means, each of said latter surfaces defining a lesser angle with said axis than said first mentioned surfaces.
Claim 10
Dependent Claim
30 words
A louver as set forth in claim 8 in which said lesser angle is about 10* and the first mentioned surface defines an angle of about 50* with said axis.
Claim 11
Dependent Claim
25 words
A louver as set forth in claim 2 in which the spacing between adjacent prisms is approximately the same as the thickness of said membrane.
Claim 12
Dependent Claim
33 words
A louver as set forth in claim 5 in which said cells are substantially deeper than the depth of said prisms and extend a substantially greater distance from said membrane than said prisms.
Claim 13
Dependent Claim
20 words
A louver as set forth in claim 1 in which the portions of said membrane intermediate adjacent cells are frosted.
References Cited (Backward Citations)
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Cited
US3368070A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |