Patent US4575783A successfully refreshed from Google Patents.
US4575783A
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Reflector for illuminating signs
Assignee: ABL IP Holding LLC
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Filing: 1983-09-16
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Granted: 1986-03-11
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Expires: 2003-09-16
Abstract
Abstract In a luminaire for illuminating signs, a reflector having segments for redirecting light to various areas of the sign so as to create a uniformly illuminated sign.
Inventors
- 👤 Douglas S. Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:59
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/0008; G; G09; G09F; G09F13/00; G09F13/04; G09F13/0418; G09F13/0422; G09F13/14; G09F2013/145; Y; Y10; Y10S; Y10S362/00; Y10S362/812
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
A luminaire in combination with a sign, the sign being of the type having its vertical length longer than its horizontal comprising, a lamp providing luminance flux positioned below and away from, yet parallel to the sign and parallel to the horizontal center of the area to be illuminated so as to provide a maximum amount of luminance directly to the vertical sign and reflector means for redirecting luminance flux which does not directly illuminate the sign to areas where desired luminance is lacking said reflector means including a reference plane along the centerline with left and right segments intersecting thereat, said segments redirecting more intense flux to the corners and edges of the sign.
Claim 2
Dependent Claim
115 words
A luminaire in combination with a sign, the sign being of the type having its vertical length longer than its horizontal comprising, a lamp providing luminance flux positioned below and away from, yet parallel to the sign and parallel to the horizontal center of the area to be illuminated so as to provide a maximum amount of luminance directly to the vertical sign and reflector means for redirecting luminance flux which does not directly illuminate the sign to areas where desired luminance is lacking said reflector means including a reference plane along the centerline with left and right segments intersecting thereat, said segments redirecting more intense flux to the corners and edges of the sign.
Claim 3
Dependent Claim
59 words
A luminaire as defined in claim 1 wherein a front area of said reflector redirects flux to the top of the sign while a back area of the reflector redirects flux to the bottom of the sign with the areas of the reflector between these front and back areas redirecting flux between the top and bottom of the sign.
Claim 4
Dependent Claim
49 words
A luminaire as defined in claim 2 wherein said reflector is divided into lateral segments with each segment redirecting flux laterally across the sign, the more intense flux being redirected to corners and edges of the sign and less intensive flux being redirected to the center of the sign.
Claim 5
Dependent Claim
56 words
A luminaire as defined in claim 3 wherein the front and center segments of the reflector intersect at common points providing a smooth contour while the segments in the back area of the reflector due to the severity of the angular changes between segments in the back area of the reflector are joined by intermediate surfaces.
Claim 6
Dependent Claim
16 words
A luminaire as defined in claim 1 wherein said reflector means comprises a specular aluminum reflector.
References Cited (Backward Citations)
US2447923A
Cited
US4451875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |