US4488208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low brightness lens for circular fluorescent lamps
Assignee: UNION-REED Corp 110 CLAY ST CAMBRIDGE 02140 A CORP OF
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Filing: 1982-08-20
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Granted: 1984-12-11
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Expires: 2002-08-20
Abstract
Abstract A transparent lighting diffuser panel is provided for circular gas discharge lamps and having an inner surface, facing the lamp, comprising a generally cylindrical toroidal fresnel lens with the optical centerline of the lens approximately equal to the lamp circle diameter and coaxial with the center of revolution of the lamp tube; and an outer surface, facing away from the lamp, comprising an overall pattern of elongated linear triangular prisms in a radial pattern coaxial with the toroidal lens and the lamp.
Inventors
- 👤 Jack V. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:00
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/04; F21S8/02; F21V; F21V5/00; F21V5/04; F21V5/045; F21Y; F21Y2103/00; F21Y2103/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A lighting diffuser for a circular gas discharge lamp comprising, a light-transmitting panel, said panel having an overall pattern on one face comprising a Fresnel lens arrangement having an optical center cylindrical ring, said lens focussing light from said lamp into a plurality of parallel rays, which ring intersecting which lamp substantially along its entire length, said panel having a pattern on its other face comprising a radial pattern of elongated, substantially triangular prisms arranged about an axis along the center of said ring.
Claim 2
Dependent Claim
84 words
A lighting diffuser for a circular gas discharge lamp comprising, a light-transmitting panel, said panel having an overall pattern on one face comprising a Fresnel lens arrangement having an optical center cylindrical ring, said lens focussing light from said lamp into a plurality of parallel rays, which ring intersecting which lamp substantially along its entire length, said panel having a pattern on its other face comprising a radial pattern of elongated, substantially triangular prisms arranged about an axis along the center of said ring.
Claim 3
Dependent Claim
44 words
A lighting diffuser for a circular gas discharge lamp according to claim 6 in which the Fresnel lens arrangement is asymmetrical in optical power, with a greater power outside the optical ring and a lesser power inside the optical ring of the lens arrangement.
Claim 4
Dependent Claim
40 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 in which the triangular prisms in the radial pattern on the surface of the panel are tapered to a point at the center of the radial pattern.
Claim 5
Dependent Claim
25 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 in which the panel is concave on the surface facing the lamp.
Claim 6
Dependent Claim
28 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 wherein the pattern of prisms is symmetrical with respect to the centerline of the panel.
Claim 7
Dependent Claim
25 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 wherein each of the prisms in said radial pattern are elongated tetrahedrons.
Claim 8
Dependent Claim
23 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 wherein the base of each tetrahedral prism faces the lamp.
Claim 9
Dependent Claim
29 words
A lighting diffuser for a circular gas discharge lamp according to claim 7 wherein the included angle between two sides of the tetrahedron opposite the base is 120 degrees.
Claim 10
Dependent Claim
51 words
A lighting diffuser for a circular gas discharge lamp according to claim 1 wherein the pattern of prisms does not extend to the edge of said panel and the pattern of prisms is bordered on its outer edge by a second pattern of elongated triangular prisms arranged in a radial pattern.
Claim 11
Dependent Claim
31 words
A lighting diffuser for a circular gas discharge lamp according to claim 9 wherein the prisms in the second pattern are tapered in a direction toward the center of said panel.
Claim 12
Dependent Claim
24 words
A lighting diffuser for a circular gas discharge lamp according to claim 9 wherein the prisms in the second pattern are truncated, elongated tetrahedrons.
Claim 13
Dependent Claim
29 words
A lighting diffuser for a circular gas discharge lamp according to claim 9 wherein the prisms in the radial pattern and in the second radial pattern form concentric rows.
References Cited (Backward Citations)
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |