Patent US4171535A successfully refreshed from Google Patents.
US4171535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire for concealed T ceiling systems
Assignee: Cooper Industries LLC
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Filing: 1977-10-28
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Granted: 1979-10-16
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Expires: 1997-10-28
Abstract
Abstract An asymmetrically mounted recessed lighting fixture which includes an integral appearance frame about the bottom edge thereof which underlies and conceals the ceiling support framework from view. The lighting fixture includes an undercut or recessed portion in one sidewall which permits mounting of the luminaire on the ceiling support framework without removal of the appearance frame which underlies and conceals the ceiling support framework.
Inventors
- 👤 Winfried N. Westermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:16
CPC Classifications
F; F21; F21V; F21V29/00; F21V29/50; F21V29/70; F21S; F21S8/00; F21S8/02; F21S8/026; F21V15/00; F21V15/01; F21V21/00; F21V21/02; F21V21/03; F21V17/00; F21V17/10; F21V17/107; F21V23/00; F21V23/02; F21V3/00; F21Y; F21Y2103/00; F21Y2113/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
An asymmetrically mounted recessed lighting fixture for concealing the ceiling support framework in a suspended ceiling system, said lighting fixture comprising: a top wall, a pair of sidewalls and a pair of end walls defining a bottom opening; an appearance frame connected to the bottom edge of each of said sidewalls and said end walls constructed and arranged to underlie and conceal, at least in part, said ceiling support framework; a framed refractor mounted within said bottom opening with the frame of said refractor being spaced a uniform distance from said appearance frame; fluorescent lamp holders mounted to each of said end walls, one of said end walls having an inwardly and horizontally directed portion defining a shelf to support one end of said recessed lighting fixture on said ceiling support framework and the other of said end walls being vertically planar; and means associated with the other of said end walls adapted to coact with said ceiling support framework to support the other end of said recessed lighting fixture.
Claim 2
Dependent Claim
170 words
An asymmetrically mounted recessed lighting fixture for concealing the ceiling support framework in a suspended ceiling system, said lighting fixture comprising: a top wall, a pair of sidewalls and a pair of end walls defining a bottom opening; an appearance frame connected to the bottom edge of each of said sidewalls and said end walls constructed and arranged to underlie and conceal, at least in part, said ceiling support framework; a framed refractor mounted within said bottom opening with the frame of said refractor being spaced a uniform distance from said appearance frame; fluorescent lamp holders mounted to each of said end walls, one of said end walls having an inwardly and horizontally directed portion defining a shelf to support one end of said recessed lighting fixture on said ceiling support framework and the other of said end walls being vertically planar; and means associated with the other of said end walls adapted to coact with said ceiling support framework to support the other end of said recessed lighting fixture.
Claim 3
Dependent Claim
29 words
The recessed lighting fixture according to claim 1 wherein said inwardly and horizontally directed portion of said one of said end walls underlies said fluorescent lamp holders mounted thereon.
Claim 4
Dependent Claim
80 words
The fluorescent lighting fixture according to claim 1 wherein said one of said end walls includes an upper vertical portion extending downwardly from the top wall to said inwardly and horizontally directed portion, an inwardly and downwardly directed portion extending from the inwardmost end of said horizontal and inwardly directed portion, and an inwardly directed notched portion and an outwardly directed flange portion including said appearance frame extending sequentially from the inwardmost end of said inwardly and downwardly directed portion.
Claim 5
Dependent Claim
186 words
An asymmetrically mounted recessed lighting fixture for concealing the ceiling support framework in a suspended ceiling system, said lighting fixture comprising: a top wall, a pair of sidewalls and a pair of end walls defining a bottom opening; an appearance frame connected to the bottom edge of each of said sidewalls and said end walls constructed and arranged to underlie and conceal, at least in part, said ceiling support framework; a framed refractor mounted within said bottom opening with the frame of said refractor being spaced a uniform distance from said appearance frame; fluorescent lamp holders mounted to each of said end walls, one of said end walls having an inwardly and horizontally directed portion defining a shelf to support one end of said recessed lighting fixture on said ceiling support framework and an inwardly directed notch-like portion permitting said fixture to be mounted around said ceiling support framework, the other of said end walls being vertically planar; and means associated with the other of said end walls adapted to coact with said ceiling support framework to support the other end of said recessed lighting fixture.
Claim 6
Dependent Claim
186 words
An asymmetrically mounted recessed lighting fixture for concealing the ceiling support framework in a suspended ceiling system, said lighting fixture comprising: a top wall, a pair of sidewalls and a pair of end walls defining a bottom opening; an appearance frame connected to the bottom edge of each of said sidewalls and said end walls constructed and arranged to underlie and conceal, at least in part, said ceiling support framework; a framed refractor mounted within said bottom opening with the frame of said refractor being spaced a uniform distance from said appearance frame; fluorescent lamp holders mounted to each of said end walls, one of said end walls having an inwardly and horizontally directed portion defining a shelf to support one end of said recessed lighting fixture on said ceiling support framework and an inwardly directed notch-like portion permitting said fixture to be mounted around said ceiling support framework, the other of said end walls being vertically planar; and means associated with the other of said end walls adapted to coact with said ceiling support framework to support the other end of said recessed lighting fixture.
Claim 7
Dependent Claim
29 words
The recessed lighting fixture according to claim 4 wherein said inwardly and horizontally directed portion of said one of said end walls underlies said fluorescent lamp holders mounted thereon.
Claim 8
Dependent Claim
75 words
The fluorescent lighting fixture according to claim 4 wherein said one of said end walls includes an upper vertical portion extending downwardly from the top wall to said inwardly and horizontally directed portion, an inwardly and downwardly directed portion extending from the inwardmost end of said horizontal and inwardly directed portion to said inwardly directed notched portion and an outwardly directed flange portion including an appearance frame extending outwardly from said inwardly directed notched portion.
References Cited (Backward Citations)
CA739315A
Cited
US2721635A
Cited
US2744716A
Cited
FR1139789A
Cited
US3058611A
Cited
US3158330A
Cited
US3281588A
Cited
US3375773A
Cited
US3555267A
Cited
US3686496A
Cited
US3796870A
Cited
US4086480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |