US4434453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glare-eliminating task lighting fixture
Assignee: Individual
•
Filing: 1982-06-01
•
Granted: 1984-02-28
•
Expires: 2002-06-01
Abstract
Abstract A task lighting assembly having a task lighting fixture secured in overlying relationship with respect to a work station, a building wall member disposed adjacent to the lighting fixture and adjacent to the work station and the lighting fixture having an upper wall, a front wall depending from the upper wall and an inwardly projecting lower wall projecting from the front wall. At least one light source receiving recess is defined between the walls. A light discharging opening is disposed between the lower wall and the building wall member. The lower wall is of sufficient length so that no significant portion of the light emitted by a light source in the recess will travel directly downwardly to illuminate the work station. The fixture preferably has no lens. The work station is illuminated primarily through reflected radiation. The undersurface of the upper wall preferably has a reflectance of at least about 80 percent. A task lighting fixture suitable for use in the above-described assembly.
Inventors
- 👤 James Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:33
CPC Classifications
F; F21; F21S; F21S8/00; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
5 words
A task lighting fixture comprising
Claim 2
Dependent Claim
5 words
A task lighting fixture comprising
Claim 3
Dependent Claim
95 words
a substantially light opaque upper wall, a front wall depending from said upper wall, a re-entrant, lower wall projecting generally inwardly from said front wall in spaced underlying relationship with respect to said upper wall, at least one light source receiving recess defined between said walls, and said lower wall being of sufficient length that when said fixture is hung with said lower wall in a generally horizontal position, no significant portion of the light emitted by a light source disposed in said recess is projected directly downwardly to a work station underlying said fixture.
Claim 4
Dependent Claim
95 words
a substantially light opaque upper wall, a front wall depending from said upper wall, a re-entrant, lower wall projecting generally inwardly from said front wall in spaced underlying relationship with respect to said upper wall, at least one light source receiving recess defined between said walls, and said lower wall being of sufficient length that when said fixture is hung with said lower wall in a generally horizontal position, no significant portion of the light emitted by a light source disposed in said recess is projected directly downwardly to a work station underlying said fixture.
Claim 5
Dependent Claim
23 words
The task lighting fixture of claim 1 including the undersurface of said upper wall having a reflectance of at least about eighty percent.
Claim 6
Dependent Claim
26 words
The task lighting fixture of claim 2 including the innermost edge of said lower wall projecting farther inwardly than the innermost portion of said light source.
Claim 7
Dependent Claim
20 words
The task lighting fixture of claim 3 including a flange member projecting from a rear portion of said upper wall.
Claim 8
Dependent Claim
23 words
The task lighting fixture of claim 3 including said fixture adapted to receive a fluorescent light source within said light source receiving recess.
Claim 9
Dependent Claim
37 words
The task lighting fixture of claim 3 including reflector means disposed within said light source-securing recess in spaced relationship with respect to said front wall, and a wireway defined between said reflector means and said first wall.
Claim 10
Dependent Claim
14 words
The task lighting fixture of claim 3 including said lighting fixture having no lens.
Claim 11
Dependent Claim
29 words
The task lighting fixture of claim 4 including the upper surface of said upper wall adapted to function as a shelf when said flange is secured to a wall.
Claim 12
Dependent Claim
115 words
A task lighting assembly comprising a task lighting fixture secured in overlying relationship with respect to a work station, a building wall member disposed adjacent said lighting fixture and adjacent said work station, said lighting fixture having an upper wall, a front wall depending from said upper wall and an inwardly projecting lower wall projecting from said front wall, at least one light source receiving recess defind between said walls, a light discharging opening between said lower wall and said building wall member, and said lower wall being of sufficient length that no significant portion of the light emitted by a light source in said recess will project directly downwardly to illuminate said work station.
Claim 13
Dependent Claim
115 words
A task lighting assembly comprising a task lighting fixture secured in overlying relationship with respect to a work station, a building wall member disposed adjacent said lighting fixture and adjacent said work station, said lighting fixture having an upper wall, a front wall depending from said upper wall and an inwardly projecting lower wall projecting from said front wall, at least one light source receiving recess defind between said walls, a light discharging opening between said lower wall and said building wall member, and said lower wall being of sufficient length that no significant portion of the light emitted by a light source in said recess will project directly downwardly to illuminate said work station.
Claim 14
Dependent Claim
18 words
The task lighting assembly of claim 9 including said work station having a generally horizontally disposed counterlike surface.
Claim 15
Dependent Claim
14 words
The task lighting assembly of claim 10 including said lighting fixture having no lens.
Claim 16
Dependent Claim
21 words
The task lighting assembly of claim 11 including said building wall surface having a reflectance of at least about fifty percent.
Claim 17
Dependent Claim
44 words
The task lighting assembly of claim 11 including the undersurface of said upper wall having a reflectance of at least eighty percent, whereby substantially all the light impinging on said work station will be reflected from said upper wall and said building wall portion.
Claim 18
Dependent Claim
26 words
The task lighting assembly of claim 9 including the innermost edge of said lower wall projecting farther inwardly than the innermost portion of said light source.
Claim 19
Dependent Claim
20 words
The task lighting assembly of claim 4 including a flange member projecting from a rear portion of said upper wall.
Claim 20
Dependent Claim
31 words
The task lighting assembly of claim 5 including the upper surface of said upper wall adapted to function as a shelf when said flange is secured to said building wall surface.
Claim 21
Dependent Claim
23 words
The task lighting assembly of claim 6 including said fixture adapted to receive a fluorescent light source within said light source receiving recess.
Claim 22
Dependent Claim
37 words
The task lighting assembly of claim 7 including reflector means disposed within said light source receiving recess in spaced relationship with respect to said front wall, and a wireway defined between said reflector and said first wall.
Claim 23
Dependent Claim
14 words
The task lighting assembly of claim 8 including said lighting fixture having no lens.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |