US4310219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light diffusing surface structure for a light guide in an information display
Assignee: SSIH Management Services SA
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Filing: 1980-03-25
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Granted: 1982-01-12
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Expires: 2000-03-25
Abstract
Abstract A light diffusing surface structure is provided for a light guide in a passive information display wherein the surface geometry of regular texture is formed by portions of circular cylinders having their axes parallel to the general plane of the surface such cylinder portions intersecting one another at angles of 60° or 90° and producing a continuous diffusion at any angle of vision.
Inventors
- 👤 Pierre-Ernest Jaccard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:26
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/0036; F; F21; F21V; F21V5/00; G02B5/00; G02B5/02; G02B5/0205; G02B5/021; G02B5/0215; G02B5/0231; G02B5/0273; G02B5/0278
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A surface of generally planar form having a diffusing surface structure for a light guide in a passive information display, said diffusing surface structure being formed at least in part of portions of surfaces of linearly extending circular cylinders having their axes parallel to the general plane, said cylinder surfaces being arranged to belong to at least two families with axes parallel to one another among the surfaces of each family and non-parallel to the axes of the surfaces of another family.
Claim 2
Dependent Claim
82 words
A surface of generally planar form having a diffusing surface structure for a light guide in a passive information display, said diffusing surface structure being formed at least in part of portions of surfaces of linearly extending circular cylinders having their axes parallel to the general plane, said cylinder surfaces being arranged to belong to at least two families with axes parallel to one another among the surfaces of each family and non-parallel to the axes of the surfaces of another family.
Claim 3
Dependent Claim
39 words
A surface as set forth in claim 1 wherein said cylindrical surfaces are convex or concave in accordance with two families of axes regularly spaced, and the axes of each family being orthogonal to those of the other family.
Claim 4
Dependent Claim
41 words
A surface as set forth in claim 1 wherein the cylindrical surfaces are convex or concave in accordance with three families having axes parallel to one another in each family regularly spaced and cutting those of the other families at 60°.
Claim 5
Dependent Claim
22 words
A surface as set forth in claim 3 wherein within each family two out of three of the cylindrical surfaces are eliminated.
Claim 6
Dependent Claim
18 words
A surface as set forth in claim 1 wherein all cylindrical surfaces have the same radius of curvature.
Claim 7
Dependent Claim
12 words
A surface as set forth in claim 1 formed by plastic moulding.
Claim 8
Dependent Claim
13 words
A surface as set forth in claim 6 formed from polymethyl methacrylate (PMMA).
References Cited (Backward Citations)
GB118269A
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US2716919A
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GB652694A
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GB662689A
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GB851217A
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FR1285829A
Cited
FR2181010B2
Cited
US3840695A
Cited
US4043636A
Cited
FR2317720A1
Cited
FR2353920B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |