US4117378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflective coating for external core electrodeless fluorescent lamp
Assignee: General Electric Co
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Filing: 1977-03-11
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Granted: 1978-09-26
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Expires: 1997-03-11
Abstract
Abstract The header and tunnel of an external core, solenoidal electric field, fluorescent lamp are coated with a thin ultraviolet light-reflective layer; for example, aluminum or magnesium oxide. Radiative heat transfer from the lamp plasma to the magnetic core is thus reduced to permit high operating power levels and good lumen maintenance.
Inventors
- 👤 Homer H. Glascock, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:23
CPC Classifications
H; H01; H01J; H01J65/00; H01J65/04; H01J65/042; H01J65/048
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
In a solenoidal electric field, fluorescent lamp comprising an evacuable, light-transmissive, substantially globular envelope having a channel; a gaseous medium within said envelope adapted to sustain an electric discharge due to an electric field induced therein, said ionizable medium emitting ultraviolet radiation when sustaining said discharge; a closed loop magnetic core having a central opening and being at least partially contained within said channel whereby said core links said gaseous medium; means for inducing said electric field in said gaseous medium; and luminous phosphors disposed on interior surfaces of said envelope and adapted to emit visible light when excited by said ultraviolet radiation; the improvement comprising: an ultraviolet-radiation-reflective coating disposed on inner surfaces of said envelope adjacent said magnetic core.
Claim 2
Dependent Claim
120 words
In a solenoidal electric field, fluorescent lamp comprising an evacuable, light-transmissive, substantially globular envelope having a channel; a gaseous medium within said envelope adapted to sustain an electric discharge due to an electric field induced therein, said ionizable medium emitting ultraviolet radiation when sustaining said discharge; a closed loop magnetic core having a central opening and being at least partially contained within said channel whereby said core links said gaseous medium; means for inducing said electric field in said gaseous medium; and luminous phosphors disposed on interior surfaces of said envelope and adapted to emit visible light when excited by said ultraviolet radiation; the improvement comprising: an ultraviolet-radiation-reflective coating disposed on inner surfaces of said envelope adjacent said magnetic core.
Claim 3
Dependent Claim
10 words
The lamp of claim 1 wherein said coating comprises aluminum.
Claim 4
Dependent Claim
11 words
The lamp of claim 1 wherein said coating comprises magnesium oxide.
Claim 5
Dependent Claim
10 words
The lamp of claim 1 wherein said core comprises ferrite.
Claim 6
Dependent Claim
23 words
The lamp of claim 1 wherein said core is linked by a dielectric tunnel, said coating being disposed on surfaces of said tunnel.
Claim 7
Dependent Claim
23 words
The lamp of claim 5 wherein said core is surrounded by a dielectric header, said coating being disposed on surfaces of said header.
Claim 8
Dependent Claim
112 words
A fluorescent lamp base structure comprising: a substantially rectangular member defining a cavity having approximately square front and back surfaces, said front and back surfaces each having a centrally located perforation, the bottom surface of said cavity having a substantially rectangular perforation and adapted to allow access to the interior of said cavity; a tubular dielectric member, having sectional dimensions approximately equal to the dimensions of said perforations, extending between said front surface and said back surface and sealed thereto the edges of said perforations; a closed loop magnetic core disposed on said tubular member and contained within said cavity; and an ultraviolet reflective coating disposed on surfaces of said dielectric member.
Claim 9
Dependent Claim
112 words
A fluorescent lamp base structure comprising: a substantially rectangular member defining a cavity having approximately square front and back surfaces, said front and back surfaces each having a centrally located perforation, the bottom surface of said cavity having a substantially rectangular perforation and adapted to allow access to the interior of said cavity; a tubular dielectric member, having sectional dimensions approximately equal to the dimensions of said perforations, extending between said front surface and said back surface and sealed thereto the edges of said perforations; a closed loop magnetic core disposed on said tubular member and contained within said cavity; and an ultraviolet reflective coating disposed on surfaces of said dielectric member.
Claim 10
Dependent Claim
20 words
The strucute of claim 7 wherein said reflective coating is further disposed on the outer surfaces of said rectangular member.
Claim 11
Dependent Claim
11 words
The structure of claim 8 wherein said reflective coating is aluminum.
Claim 12
Dependent Claim
12 words
The structure of claim 8 wherein said reflective coating is magnesium oxide.
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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |