US3591798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fixture
Assignee: Lightolier Inc
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Filing: 1968-11-04
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Granted: 1971-07-06
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Expires: 1988-11-04
Abstract
Abstract A lighting fixture comprising a pair of parallel vertically aligned fluorescent lamps positioned midway between two elongated specular reflecting surfaces each of which is substantially parabolic in curvature. The reflecting surfaces are arranged with respect to the lamps so that the major portion of the illumination provided by the fixture will be projected therefrom at an angle greater than 30* with respect to the vertical so as to minimize the veiling reflections effect to a viewer whose working surface is illuminated by such fixture.
Inventors
- 👤 Noel S Florence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/02; F21S; F21S8/00; F21S8/02; F21S8/026; F21V7/00; F21V7/04; F21V7/06; F21S2/00; F21V7/005; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
165 words
A lighting fixture comprising an elongated inverted troughshaped housing having two opposed elongated specular reflecting surfaces, means in said housing for supporting a pair of elongated fluorescent lamps to extend longitudinally of said housing parallel to each other and in juxtaposed vertical alignment, said lamps being positioned midway between said pair of specular reflecting surfaces, each of said specular reflecting surfaces being substantially parabolic in curvature, an arcuate reflector positioned over the uppermost lamp and extending substantially the length thereof midway between the two substantially parabolic specular reflecting surfaces, the longitudinal edges of the arcuate reflector being positioned with respect to the curved surfaces of the parabolic reflectors to permit impingement of light rays from the lamps against only that portion of the curved surface of each of the parabolic reflectors which will reflect light therefrom in convergent rays, whereby the greater portion of the total illumination provided by said fixture will be emitted within a 30* to 60* zone with respect to the vertical.
Claim 2
Dependent Claim
165 words
A lighting fixture comprising an elongated inverted troughshaped housing having two opposed elongated specular reflecting surfaces, means in said housing for supporting a pair of elongated fluorescent lamps to extend longitudinally of said housing parallel to each other and in juxtaposed vertical alignment, said lamps being positioned midway between said pair of specular reflecting surfaces, each of said specular reflecting surfaces being substantially parabolic in curvature, an arcuate reflector positioned over the uppermost lamp and extending substantially the length thereof midway between the two substantially parabolic specular reflecting surfaces, the longitudinal edges of the arcuate reflector being positioned with respect to the curved surfaces of the parabolic reflectors to permit impingement of light rays from the lamps against only that portion of the curved surface of each of the parabolic reflectors which will reflect light therefrom in convergent rays, whereby the greater portion of the total illumination provided by said fixture will be emitted within a 30* to 60* zone with respect to the vertical.
Claim 3
Dependent Claim
55 words
The combination set forth in claim 1 in which each of said opposed specular reflecting surfaces has an optical curve that lies between two parabolic curves having axis of 25* and 45* respectively with respect to the vertical, each of said parabolic curves having its focus at a point positioned substantially midway between said lamps.
Claim 4
Dependent Claim
41 words
The combination set forth in claim 2 in which each focal point is positioned substantially midway between a line tangent to the outer surface of both of said vertically disposed lamps and a line extending through the axes of said lamps.
Claim 5
Dependent Claim
26 words
The combination set forth in claim 1 in which said arcuate reflector has as its focus the longitudinal axis of the lowermost lamp of said pair.
Claim 6
Dependent Claim
27 words
The combination set forth in claim 1 in which each of said opposed specular reflecting surfaces has an axIs of substantially 35* with respect to the vertical.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |