Patent US3705303A successfully refreshed from Google Patents.
US3705303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire
Assignee: General Electric Co
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Filing: 1971-03-12
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Granted: 1972-12-05
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Expires: 1991-03-12
Abstract
Abstract Luminaire for indoor industrial use has an optical assembly having a diameter substantially greater than its height and adapted to be mounted at a relatively low height above the floor. The optical assembly comprises a reflector with fluted concave upper portion and an outwardly flaring lower skirt portion to which a large diameter dish-shaped refractor is secured. The refractor has an annular side wall formed with horizontal rows of prisms which depress part of the incident light and reflect the remaining light rays upwardly toward the ceiling. The bottom panel of the refractor is formed with radial light dispersing flutes.
Inventors
- 👤 Candler A Willis Jr
- 👤 John R Judge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:44
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/04; F21S8/06; F21V; F21V13/00; F21V13/02; F21V13/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
160 words
A luminaire comprising, in combination, an optical assembly comprising a reflector having an upper portion and a lower downwardly flaring skirt portion defining an open bottom, and a generally dish-shaped refractor having an open top and a closed bottom, said reflector and said refractor being connected to each other at their peripheries with said refractor arranged below and closing the bottom of said reflector, said optical assembly being substantially greater in overall diameter than in height, and a lamp mounted in said optical assembly and having a light center arranged above the bottom of said reflector, said refractor having a peripheral side wall formed on its outer surface with annular rows of prisms having substantially vertical refracting surfaces and substantially horizontal reflecting surfaces, said substantially vertical refracting surfaces depressing light rays incident thereon from said lamp downwardly from said optical assembly, and said substantially horizontal reflecting surfaces re-directing light rays incident thereon from said lamp upwardly from said optical assembly.
Claim 2
Dependent Claim
160 words
A luminaire comprising, in combination, an optical assembly comprising a reflector having an upper portion and a lower downwardly flaring skirt portion defining an open bottom, and a generally dish-shaped refractor having an open top and a closed bottom, said reflector and said refractor being connected to each other at their peripheries with said refractor arranged below and closing the bottom of said reflector, said optical assembly being substantially greater in overall diameter than in height, and a lamp mounted in said optical assembly and having a light center arranged above the bottom of said reflector, said refractor having a peripheral side wall formed on its outer surface with annular rows of prisms having substantially vertical refracting surfaces and substantially horizontal reflecting surfaces, said substantially vertical refracting surfaces depressing light rays incident thereon from said lamp downwardly from said optical assembly, and said substantially horizontal reflecting surfaces re-directing light rays incident thereon from said lamp upwardly from said optical assembly.
Claim 3
Dependent Claim
38 words
A luminaire as defined in claim 1, said refractor having a bottom panel formed with a plurality of elongated refracting portions radiating from the center of said bottom panel for circumferentially spreading light rays emanating from said panel.
Claim 4
Dependent Claim
25 words
A luminaire as defined in claim 2, said elongated radiating refracting portions comprising transversely convex flutes formed on the inner surface of said refractor panel.
Claim 5
Dependent Claim
18 words
A luminaire as defined in claim 3, said flutes being of substantially constant refractive power along their lengths.
Claim 6
Dependent Claim
50 words
A luminaire as defined in claim 1, a ballast housing arranged above and connected to said optical assembly for supporting the same, and an accessory reflector mounted at the bottom of said ballast housing above said upper reflector portion for reflecting light rays from said lamp downwardly through said refractor.
Claim 7
Dependent Claim
22 words
A luminaire as defined in claim 1, said reflector portions being formed with flutes for horizontally spreading lighT rays from said lamp.
Claim 8
Dependent Claim
20 words
A luminaire as defined in claim 1, the height of said reflector being about twice the height of said refractor.
Claim 9
Dependent Claim
20 words
A luminaire as defined in claim 7, the overall diameter of said optical assembly being at least twice its height.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |