US4237528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire
Assignee: General Electric Co
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Filing: 1977-11-23
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Granted: 1980-12-02
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Expires: 1997-11-23
Abstract
Abstract Indoor lighting fixture providing indirect asymmetrical light distribution. The fixture, which is adapted to be positioned adjacent a wall and below a ceiling, comprises a high intensity gaseous discharge lamp and an upwardly opening asymmetric reflector which is inclined to the horizontal for projecting light forwardly and laterally toward the ceiling while restricting light below the horizontal, so as to provide ample, uniformly distributed indirect light in the work area while shielding the light source from direct view of the room occupants to avoid glare.
Inventors
- 👤 Samuel L. Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:17
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/03; F21S8/033; F21V; F21V7/00; F21V7/0008; F21V7/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
A luminaire adapted to be mounted eccentric to a work area below a ceiling or the like for indirectly lighting the work area comprising, in combination, a housing having side, front and rear walls defining an open top, said housing having a horizontal fore-and-aft axis intersecting said front and rear walls, a bowl-shaped reflector having a light center therein and a rim defining an opening, said reflector mounted within said housing with its opening facing the open top of said housing and being tilted toward the front of said housing so that the plane of said opening is at an angle to said fore-and-aft axis, and an elongated high intensity gaseous discharge lamp mounted within said reflector at said light center and extending generally parallel to the plane of said reflector opening, the light emanating upwardly from the luminaire principally forwardly and laterally therefrom with substantially no light emanating therefrom below said fore-and-aft axis.
Claim 2
Dependent Claim
154 words
A luminaire adapted to be mounted eccentric to a work area below a ceiling or the like for indirectly lighting the work area comprising, in combination, a housing having side, front and rear walls defining an open top, said housing having a horizontal fore-and-aft axis intersecting said front and rear walls, a bowl-shaped reflector having a light center therein and a rim defining an opening, said reflector mounted within said housing with its opening facing the open top of said housing and being tilted toward the front of said housing so that the plane of said opening is at an angle to said fore-and-aft axis, and an elongated high intensity gaseous discharge lamp mounted within said reflector at said light center and extending generally parallel to the plane of said reflector opening, the light emanating upwardly from the luminaire principally forwardly and laterally therefrom with substantially no light emanating therefrom below said fore-and-aft axis.
Claim 3
Dependent Claim
35 words
A luminaire as defined in claim 1, said housing having a top frame defining a top housing opening and providing a cut-off at predetermined angles for direct and reflected light rays emanating from said housing.
Claim 4
Dependent Claim
45 words
A luminaire as defined in claim 2, the sides of said reflector having upper portions of parabolic contour in vertical section with foci substantially at said light center, and having lower portions of elliptical contour in vertical section with foci substantially at said light center.
Claim 5
Dependent Claim
16 words
A luminaire as defined in claim 2, said angle to said fore-and-aft axis being about 20°-40°.
Claim 6
Dependent Claim
50 words
A luminaire as defined in claim 4, said reflector being substantially ovate and having front and rear ends, and socket means secured within said reflector to the front end thereof, said lamp having a base attached to said socket means and extending therefrom toward the rear end of said reflector.
Claim 7
Dependent Claim
26 words
A luminaire as defined in claim 1, including reflecting means extending around said reflector at said opening thereof and upwardly to the top of said housing.
Claim 8
Dependent Claim
26 words
A luminaire as defined in claim 1, the bottom of said reflector being contoured to reflect light incident thereon principally upwardly and forwardly from said housing.
Claim 9
Dependent Claim
26 words
A luminaire as defined in claim 7, the sides of said reflector being contoured to reflect light incident thereon principally upwardly and laterally from said housing.
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) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |