US3769503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp fixture having dichoric filter arrangement for selectively directing heat and light
Assignee: General Electric Co
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Filing: 1972-06-23
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Granted: 1973-10-30
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Expires: 1992-06-23
Abstract
Abstract A fixture for a lamp which emits both light and heat. A first dichroic filter which reflects light and transmits heat, and a second dichroic filter which reflects heat and transmits light, are movably positioned relative to each other near the lamp, so as to be capable of selectively directing both heat and light from the lamp in a given direction, or directing light only from the lamp in a given direction.
Inventors
- 👤 Chul Kim Sang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
F; F21; F21V; F21V9/00; F21V9/04; F21V7/00; F21V7/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A lamp fixture for use with a light source which emits heat in addition to light, wherein the improvement comprises a first dichroic filter member adapted to reflect light and transmit heat from said light source and fixedly positioned with respect to said source a given distance therefrom to reflect light from said source in a given direction, and a second dichroic filter member adapted to reflect heat and transmit light from said light source, and mounting means movably positioning said second filter with respect to the position of said light source whereby said second filter can be selectively rotated about said position of the light source to positions on opposite sides thereof in alignment with said given direction of light so as to reflect heat from said light source in said given direction or away from said given direction.
Claim 2
Dependent Claim
140 words
A lamp fixture for use with a light source which emits heat in addition to light, wherein the improvement comprises a first dichroic filter member adapted to reflect light and transmit heat from said light source and fixedly positioned with respect to said source a given distance therefrom to reflect light from said source in a given direction, and a second dichroic filter member adapted to reflect heat and transmit light from said light source, and mounting means movably positioning said second filter with respect to the position of said light source whereby said second filter can be selectively rotated about said position of the light source to positions on opposite sides thereof in alignment with said given direction of light so as to reflect heat from said light source in said given direction or away from said given direction.
Claim 3
Dependent Claim
84 words
A lamp fixture as claimed in claim 1, in which said first and second filter members are in the shape of hollow hemispheres with the concave surfaces thereof facing toward said position of the light source and contoured to respectively reflect said light and heat in predetermined patterns, and in which said mounting means comprises pivotal means permitting said second filter member to be swung about an axis extending substantially along a diameter thereof and through or near said position of the Light source.
Claim 4
Dependent Claim
54 words
A lamp fixture as claimed in claim 2, in which said second filter member is positioned relatively closer to said position of the light source than is said first filter member, whereby said second filter member can be rotated to a position between said first filter member and said position of the light source.
Claim 5
Dependent Claim
87 words
A lamp fixture as claimed in claim 1, in which said first and second filter members are in the shape of hollow semicylinders with the concave surfaces thereof facing toward said position of the light source and contoured to respectively reflect said light and heat in predetermined patterns, and in which said mounting means comprises pivotal means permitting said second filter member to be swung about an axis extending substantially along the axis of said second semicylinder and through or near said position of the light source.
Claim 6
Dependent Claim
54 words
A lamp fixture as claimed in claim 4, in which said second filter member is positioned relatively closer to said position of the light source than is said first filter member, whereby said second filter member can be rotated to a position between said first filter member and said position of the light source.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |