Patent US3858042A successfully refreshed from Google Patents.
US3858042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting fixture
Assignee: General Electric Co
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Filing: 1973-07-05
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Granted: 1974-12-31
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Expires: 1993-07-05
Abstract
Abstract Rectangular lighting fixture with open bottom has a closure frame which interfits with the bottom of the fixture in a manner to prevent visible light leaks around the frame and is detachably connected to the fixture by coil springs to facilitate detachment of the closure.
Inventors
- 👤 D Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:39
CPC Classifications
F; F21; F21V; F21V17/00; F21V17/10; F21V17/16; F21V17/162; F21V23/00; F21V23/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
A luminaire comprising, in combination, a housing having side walls and a bottom rim defining and extending around an opening having an axis, lampholder means for mounting a light source within said housing so that light rays from the light source emanate through said bottom opening, said bottom rim projecting inwardly and downwardly at an oblique angle relative to said axis, and closure means removably covering said bottom opening in closed position, said closure means comprising a light transmitting panel and a frame surrounding said panel, said frame having an upper surface formed at an angle corresponding to said oblique angle of said bottom rim and being in closely adjacent, substantially parallel relation to said bottom rim in the closed position of said closure means, whereby any light leakage between said frame and said bottom rim is directed upwardly.
Claim 2
Dependent Claim
139 words
A luminaire comprising, in combination, a housing having side walls and a bottom rim defining and extending around an opening having an axis, lampholder means for mounting a light source within said housing so that light rays from the light source emanate through said bottom opening, said bottom rim projecting inwardly and downwardly at an oblique angle relative to said axis, and closure means removably covering said bottom opening in closed position, said closure means comprising a light transmitting panel and a frame surrounding said panel, said frame having an upper surface formed at an angle corresponding to said oblique angle of said bottom rim and being in closely adjacent, substantially parallel relation to said bottom rim in the closed position of said closure means, whereby any light leakage between said frame and said bottom rim is directed upwardly.
Claim 3
Dependent Claim
21 words
A luminaire as defined in claim 1, and means releasably holding said closure means in closed position covering said bottom opening.
Claim 4
Dependent Claim
46 words
A luminaire as defined in claim 2, said closure holding means comprising elongated spring means attached to said frame at one side thereof and projecting means at the opposite side of said frame engagable with said bottom rim for retaining said closure means on said housing.
Claim 5
Dependent Claim
35 words
A luminaire as defined in claim 3, said frame having an upwardly projecting flange portion extending around the same, said flange portion nesting within said bottom housing rim in closed position of said closure means.
Claim 6
Dependent Claim
71 words
A luminaire as defined in claim 4, said housing having a partition member arranged inwardly of said side walls thereof, said elongated spring meanS comprising a pair of spaced expandable coil springs connected at one end to said one side of said frame and at the other end to said partition member, said spring means urging said closure means upwardly and toward said housing at said opposite side of said frame.
Claim 7
Dependent Claim
42 words
A luminaire as defined in claim 5, said projecting means comprising a pair of spaced projections arranged spaced above said upper frame surface at said opposite side, so as to define with said surface an opening therebetween for receiving said bottom rim.
References Cited (Backward Citations)
US3281588A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |