Patent DE880893C successfully refreshed from Google Patents.
US4040725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display illuminating structure
Assignee: PRICE EDISON
•
Filing: 1976-01-22
•
Granted: 1977-08-09
•
Expires: 1996-01-22
Abstract
Abstract A structure for illuminating vertical displays such as pictures or the like includes a rectangular window in the ceiling whose front and rear edges are spaced from the display area so that lines extending between such front and rear edges, and the top and bottom edges of the display area, are approximately between 15° and 45° to the vertical. A series of spaced inclined slats registering with the window have specular front faces and light absorbing rear faces and are inclined, related and dimensioned to direct and confine the ambient exterior light traversing the window to the display area. In one form the slats lie in forwardly downwardly converging planes and have top edges terminating in rearwardly directed flanges lying in a horizontal or inclined plane and a light modulating grid plate may be provided having alternate laterally extending opaque and transparent stripes overly the flanges and the plate is transversely adjustable.
Inventors
- 👤 Isaac Goodbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:33
CPC Classifications
F; F21; F21V; F21V11/00; F21V11/02; F21S; F21S11/00; F21V14/00; F21V14/08; G; G09; G09F; G09F13/00; G09F13/02; F21V33/00; F21V33/0004; F21V33/0024; F21V33/0028; F21V33/0032; F21W; F21W2131/00; F21W2131/30; F21W2131/304
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
173 words
A display illuminating structure comprising a ceiling, a floor, a vertically extending display area disposed between said ceiling and floor and delineated by top and bottom edges, said ceiling having a light transmissive window therein with front and rear edges proximate and remote from the plane of said display area and being exposed to the exterior ambient light, the planes between the top and bottom edges of said display area and the front rear edges of said window being at angles between about 15° and 45° to the plane of said display area, and means registering with said window directing and confining the major portion of the light incident on said window to said display area, wherein the light directing means comprises a plurality of transversely spaced, laterally extending slats inclined at angles between 15° and 45° to the vertical, and said angles of inclination increase with the distance of the respective slats from the plane of the display area, and the rearwardly directed faces of said slats are of low light reflectivity.
Claim 2
Dependent Claim
173 words
A display illuminating structure comprising a ceiling, a floor, a vertically extending display area disposed between said ceiling and floor and delineated by top and bottom edges, said ceiling having a light transmissive window therein with front and rear edges proximate and remote from the plane of said display area and being exposed to the exterior ambient light, the planes between the top and bottom edges of said display area and the front rear edges of said window being at angles between about 15° and 45° to the plane of said display area, and means registering with said window directing and confining the major portion of the light incident on said window to said display area, wherein the light directing means comprises a plurality of transversely spaced, laterally extending slats inclined at angles between 15° and 45° to the vertical, and said angles of inclination increase with the distance of the respective slats from the plane of the display area, and the rearwardly directed faces of said slats are of low light reflectivity.
Claim 3
Dependent Claim
39 words
The display illuminating structure of claim 1 wherein said slats are dimensioned, shaped and inclined so that exterior ambient light incident on and reflected by said specular faces is confined by the successively forward slats to the display area.
Claim 4
Dependent Claim
34 words
The display illuminating structure of claim 1 wherein the upper edges of said slats lie in a forwardly downwardly inclined plane and terminate at their tops in rearwardly directed flanges lying in said plane.
Claim 5
Dependent Claim
36 words
The display illuminating structure of claim 3 including a forwardly rearwardly movable inclined light modulating plate including transversely spaced laterally extending parallel alternate light transmissive and light absorbing areas movable into adjustable registry with said flanges.
Claim 6
Dependent Claim
17 words
The display illuminating device of claim 1, wherein the forwardly directed faces of said slats are specular.
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) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |