US3857030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflector for light fixtures
Assignee: L Eclairage Technique SA
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Filing: 1973-07-19
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Granted: 1974-12-24
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Expires: 1993-07-19
Abstract
Abstract Reflector for light fixture, characterized in that it is constituted by juxtaposition of ruled surfaces with a view to permitting the use of a light source of elongate form, which can have small or large dimensions.
Inventors
- 👤 M Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:35
CPC Classifications
F; F21; F21V; F21V7/00; F21V7/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A luminaire capable of receiving different light sources whose length along an axis may vary between two known values comprising in combination a reflector having a plurality of juxtaposed reflecting surfaces arranged so that the section of said reflector through a set of planes passing through the axis of the light source is a broken line formed by segments of straight lines, each segment forming with the adjacent segment an obtuse angle, said segments being, in each of said sets of planes chords of the arc of a parabola assuring in each plane of the set a good photometric distribution for the light source of a large dimension, the length of each of said chords being greater than the length of the smaller of the two known values and less than the length of the greater of the two known values.
Claim 2
Dependent Claim
141 words
A luminaire capable of receiving different light sources whose length along an axis may vary between two known values comprising in combination a reflector having a plurality of juxtaposed reflecting surfaces arranged so that the section of said reflector through a set of planes passing through the axis of the light source is a broken line formed by segments of straight lines, each segment forming with the adjacent segment an obtuse angle, said segments being, in each of said sets of planes chords of the arc of a parabola assuring in each plane of the set a good photometric distribution for the light source of a large dimension, the length of each of said chords being greater than the length of the smaller of the two known values and less than the length of the greater of the two known values.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |