Patent US4451875A successfully refreshed from Google Patents.
US4451875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poster panel lighting fixture
Assignee: Johns Manville
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Filing: 1982-03-02
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Granted: 1984-05-29
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Expires: 2002-03-02
Abstract
Abstract A single lighting fixture for mounting in front of a large billboard having a horizontal length approximately two times as long as its vertical length is disclosed. The lighting fixture comprises a lamp housing having a lamp positioned therein with the lamp being approximately horizontally positioned in the housing. A new and novel reflector is positioned on one side of the lamp is designed to reflect the light radiating from the lamp in such a manner that the bottom surface of the reflector is utilized to light up the approximate central portion of the billboard while the sides of the reflector are used to light triangular shaped side corners of the billboard. A refractor is positioned on the lamp housing to totally enclose the lamp with the refractor comprising in part three phase light control prism elements for stray light control. The combination of the reflector and refractor is designed so as to illuminate the opposite adjacent corners of the billboard with approximately 80% of the light quantity illuminating approximately 30% of the billboard corners and approximately 20% of the light quantity illuminating 70% of the edge of the billboard.
Inventors
- 👤 Herbert A. Odle
- 👤 John D. Green
- 👤 Jan Shadwick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:17
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/0008; F21V5/00; G; G09; G09F; G09F13/00; G09F13/02; Y; Y10; Y10S; Y10S362/00; Y10S362/812
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
169 words
A lighting fixture for mounting in front of a large panel such as an advertising billboard and for illuminating the panel, the panel being of the type having a horizontal length approximately two times as long as its vertical length, comprising: (a) a lamp housing; (b) a generally horizontally positioned lamp contained within the lamp housing; (c) means, attached to the lamp, for lighting the lamp; (d) a reflector positioned on one side of the lamp and designed to reflect the light radiating from the lamp, the reflector having a first generally linear translated bottom parabolic surface and further having two side surfaces formed parabolic in one direction through a horizontal section of the side surface; and (e) a refractor, positioned on the lamp housing, to totally enclose the lamp from outside weather elements, the refractor comprising in part a combination of prism elements designed for three-phase light control of stray light and designed to refract, to reflect and finally to refract the stray light radiating from the lamp.
Claim 2
Dependent Claim
169 words
A lighting fixture for mounting in front of a large panel such as an advertising billboard and for illuminating the panel, the panel being of the type having a horizontal length approximately two times as long as its vertical length, comprising: (a) a lamp housing; (b) a generally horizontally positioned lamp contained within the lamp housing; (c) means, attached to the lamp, for lighting the lamp; (d) a reflector positioned on one side of the lamp and designed to reflect the light radiating from the lamp, the reflector having a first generally linear translated bottom parabolic surface and further having two side surfaces formed parabolic in one direction through a horizontal section of the side surface; and (e) a refractor, positioned on the lamp housing, to totally enclose the lamp from outside weather elements, the refractor comprising in part a combination of prism elements designed for three-phase light control of stray light and designed to refract, to reflect and finally to refract the stray light radiating from the lamp.
Claim 3
Dependent Claim
30 words
The lighting fixture as defined in claim 1, further comprising the lamp housing adapted to be horizontally positioned at the central portion of a billboard away from the billboard's surface.
Claim 4
Dependent Claim
33 words
A lighting fixture as defined in claim 1, further comprising a plurality of spherical protrusions being formed in the interior of the bottom reflector surface to eliminate radial streaks on a billboard surface.
Claim 5
Dependent Claim
45 words
The lighting fixture as defined in claim 1, further comprising the first bottom parabolic surface of the reflector positioned for lighting a central portion of a billboard and further comprising the two side surfaces of the reflector lighting generally triangular shaped corners of a billboard.
Claim 6
Dependent Claim
41 words
The lighting fixture as defined in claim 4, further comprising a plurality of bumps being formed on the interior of the reflector to eliminate radial streaks in a billboard between a central lighted portion and between generally triangular shaped corner portions.
Claim 7
Dependent Claim
62 words
The lighting fixture as defined in claim 5, further comprising a plurality of spherical protrusions formed in the reflector surface being formed as truncated spheres having a +10° or -10° slope giving a +20° or -20° light despersion on each side of the line between a central lighted portion of a billboard and two generally triangular shaped corner portions of the billboard.
Claim 8
Dependent Claim
33 words
A lighting fixture as defined in claim 1, further comprising the combination of prism elements on the refractor being positioned at the rear central portion and along each side of the refractor surface.
Claim 9
Dependent Claim
26 words
A lighting fixture as defined in claim 1, further comprising the outside surface of the refractor being formed as a generally smooth surface for self-cleaning purposes.
Claim 10
Dependent Claim
42 words
The lighting fixture as defined in claim 1, further comprising the lamp housing being positioned approximately three to four feet away from a billboard surface and further being positioned approximately one foot away from an elongated edge of the same billboard surface.
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) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |