Patent US2794435A successfully refreshed from Google Patents.
Patent US4519019A successfully refreshed from Google Patents.
US4519019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling light fitting
Assignee: Quantum Lighting Ltd
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Filing: 1984-04-20
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Granted: 1985-05-21
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Expires: 2004-04-20
Abstract
Abstract A ceiling light fitting has three extended, constant-section reflectors which are parallel to the wall, the reflector being swingable back to enable the lamp to be changed. The lamp filament is linear and parallel to the wall. The reflectors are of part-circular section and enhance the light, as well as the reflector acting as a mask to prevent the filament being seen from behind the fitting. The reflector projects very little below ceiling level. The reflector is parabolic with the filament at its focus, the axis of the parabola being directed at the base portion of the wall. The reflector faces downwards and has at least its major part above the level of the filament and on the wall side of the filament.
Inventors
- 👤 Stephen M. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:31
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/04; F21V7/09; F21S; F21S8/00; F21S8/02; F21Y; F21Y2103/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A ceiling light fitting for lighting a wall, comprising: means for mounting the fitting in the ceiling; holding means for holding a lamp in the fitting with its light source roughly at ceiling level; an extended reflector for extending substantially parallel to the wall, the shape of the reflector surface as seen in section at right angles to the wall being substantially constant wherever the section is taken along the length of the reflector, the reflector facing generally downwards and having at least its major part positioned above the level of the light source and on the wall side of the light source, the said shape of the reflector as seen in the said section being generally concave and arranged to direct reflected light towards the base portion of the wall.
Claim 2
Dependent Claim
131 words
A ceiling light fitting for lighting a wall, comprising: means for mounting the fitting in the ceiling; holding means for holding a lamp in the fitting with its light source roughly at ceiling level; an extended reflector for extending substantially parallel to the wall, the shape of the reflector surface as seen in section at right angles to the wall being substantially constant wherever the section is taken along the length of the reflector, the reflector facing generally downwards and having at least its major part positioned above the level of the light source and on the wall side of the light source, the said shape of the reflector as seen in the said section being generally concave and arranged to direct reflected light towards the base portion of the wall.
Claim 3
Dependent Claim
21 words
The light fitting of claim 1, wherein the reflector surface is generally parabolic with the light source substantially at its focus.
Claim 4
Dependent Claim
17 words
The fitting of claim 1, wherein the said extended reflector has a non-specular surface, for diffused reflection.
Claim 5
Dependent Claim
31 words
The light fitting of claim 1, wherein the edge of the said extended reflector which is nearer the wall is arranged to be approximately at the same level as the ceiling.
Claim 6
Dependent Claim
31 words
The light fitting of claim 1, wherein the holding means is for holding a lamp with a linear light source with the light source arranged to extend parallel to the wall.
Claim 7
Dependent Claim
41 words
The light fitting of claim 1, and further comprising at least one additional extended reflector, of concave curved section, for extending substantially parallel to the wall, positioned in relation to the lamp holding means for reflecting light back through the lamp.
Claim 8
Dependent Claim
21 words
The light fitting of claim 6, wherein said additional reflector is of substantially part-circular section, centred substantially on the light source.
Claim 9
Dependent Claim
26 words
The light fitting of claim 6, wherein at least part of at least one said additional reflector can be moved aside for replacement of the lamp.
Claim 10
Dependent Claim
46 words
The light fitting of claim 6, wherein at least part of at least one said additional reflector acts as masking means for preventing the light source being seen from positions which are on the other side to the wall of the vertical through the light source.
Claim 11
Dependent Claim
114 words
The light fitting of claim 9, wherein said first-mentioned extended reflector terminates adjacent the vertical through the light source, and the or each said additional reflector has its major part on the remote side of the light source from the wall, said additional reflector or reflectors comprising an upper portion extending above the level of the light source, the adjacent edges of said upper portion and of the first-mentioned reflector being spaced apart and either substantially coinciding or overlapping as seen looking along a line passing through the light source, and a lower portion extending below the level of the light source to act as the said masking means as well as a reflector.
Claim 12
Dependent Claim
55 words
The light fitting of claim 10, wherein the said upper portion terminates above the edge of the first-mentioned reflector and is of a greater radius than the said lower portion, the difference in radii being approximately equal to the distance between the reflecting surfaces of said upper portion and said first-mentioned reflector where they overlap.
Claim 13
Dependent Claim
35 words
The light fitting of claim 10, wherein the said first-mentioned extended reflector and the said upper portion are formed as a single metal extrusion and the said lower portion is formed as another metal extrusion.
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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |