Patent US4041305A successfully refreshed from Google Patents.
US4041305A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminaire using one-way mirror as exterior lens
Assignee: Thomas and Betts Holdings Inc
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Filing: 1976-06-28
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Granted: 1977-08-09
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Expires: 1996-06-28
Abstract
Abstract Disclosed is an outdoor luminaire employing as its external lens, panels of one-way reflecting glass. During the day, or with the interior lamp unlit, the panels provide an opaque outer surface reflective of the surroundings. With the lamp lit, the panels act merely as lenses passing the light emitted by the interior lamp. In order to make the luminaire opaque, diagonal baffles are provided to extend from each corner of the luminaire toward the lamp and lamp prismatic refractor. These baffles tend to produce four separate compartments with opaque interior walls to prevent the lamp and internal components from being visible when the lamp is unlit. By making the baffles reflective, a further enhancement of the internal masking is effected while further enhancing the optical characteristics of the luminaire when lit.
Inventors
- 👤 John Richard Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:53
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/08; F21S8/085; F21S8/088; F21V; F21V3/00; F21V3/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A luminaire having a light source enclosed by a plurality of panels for transmitting light from said source, at least one of said panels spaced from said source and reflective of light from outside said luminaire while emitting light from said source when said source is energized, a pair of baffles extending radially from said source toward respective ends of said panel to render said luminaire opaque to light passing into said panel with the light source de-energized.
Claim 2
Dependent Claim
78 words
A luminaire having a light source enclosed by a plurality of panels for transmitting light from said source, at least one of said panels spaced from said source and reflective of light from outside said luminaire while emitting light from said source when said source is energized, a pair of baffles extending radially from said source toward respective ends of said panel to render said luminaire opaque to light passing into said panel with the light source de-energized.
Claim 3
Dependent Claim
22 words
A luminaire as claimed in claim 1, wherein said baffles comprise essentially planar members having reflective surfaces adjoining ends of said panel.
Claim 4
Dependent Claim
41 words
A luminaire as claimed in claim 2 wherein each of said baffles comprises a sheet member and extends from an inner terminus adjacent said light source to a termination at a corner of said luminaire adjoining an end of said panel.
Claim 5
Dependent Claim
61 words
A luminaire as claimed in claim 1, wherein all of the panels disposed radially outwardly of said light source are reflective of outside light and emissive of light from said source, and each of said panels is spaced from source a like distance, and in which there are paired baffles adjoining each panel, with said baffles disposed radially from said source.
Claim 6
Dependent Claim
30 words
A luminaire as claimed in claim 4, in which said light source comprises a lamp mounted on a vertical axis with a frusto-conic refractor disposed concentrically outwardly of said lamp.
Claim 7
Dependent Claim
22 words
A luminaire as claimed in claim 5, wherein said luminaire has a rectangular cross section in both the horizontal and vertical planes.
Claim 8
Dependent Claim
82 words
A luminaire including a light source for transmitting light when energized through a plurality of lens panels spaced from said light source, each of said panels being reflective of light transmitted from externally of the luminaire with the source deenergized, the invention comprising a plurality of baffles of sheet material each extending radially from said light source to a location adjacent a respective end of one of said panels to render said luminaire essentially opaque to light from exterior of the luminaire.
Claim 9
Dependent Claim
82 words
A luminaire including a light source for transmitting light when energized through a plurality of lens panels spaced from said light source, each of said panels being reflective of light transmitted from externally of the luminaire with the source deenergized, the invention comprising a plurality of baffles of sheet material each extending radially from said light source to a location adjacent a respective end of one of said panels to render said luminaire essentially opaque to light from exterior of the luminaire.
Claim 10
Dependent Claim
28 words
A luminaire as claimed in claim 7, wherein there are four lens panels surrounding said light source with four baffles extending between said light source and said panels.
Claim 11
Dependent Claim
36 words
A luminaire as claimed in claim 8, wherein there are spring means on each of said baffles, each of said spring means positioned to engage the adjacent panel end and support said panel within the luminaire.
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 |