Patent US3633169A successfully refreshed from Google Patents.
Patent US2396338A successfully refreshed from Google Patents.
US4339686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal vapor lamp having internal coating for extending condensate film
Assignee: General Electric Co
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Filing: 1979-12-26
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Granted: 1982-07-13
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Expires: 1999-12-26
Abstract
Abstract The coating on the inside of a metal halide lamp for promoting the formation of a liquid condensate film consists of particles of a refractory oxide in generally block-like or spherical or fiber-like shapes. Block-like or spherical particles should be laid down as monolayers with the distances between particles being of the order of the particle dimensions. Fiber-like particles may be also laid down as a monolayer or, alternatively, in a coating several diameters thick to form "fiber piles" having a free volume for holding liquid which is much greater than the volume of the fibers.
Inventors
- 👤 Ralph M. Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:21
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
118 words
A high intensity metal vapor discharge lamp comprising: a sealed light-transmitting envelope, a discharge-supporting filling in said envelope including metal salt substantially in excess of the quantity vaporized in operation of said lamp, the excess of said metal salt being liquid at the temperature of the walls of said envelope during operation, electrode means for supporting a discharge within said envelope, and a coating within said envelope promoting the formation of a film of said excess salt on the walls, said coating comprising particles of refractory metal oxides, oxynitrides or nitrides in generally block-like or spherical or fiber-like shapes laid down substantially in a monolayer with the distances between particles being of the order of the particle dimensions.
Claim 2
Dependent Claim
118 words
A high intensity metal vapor discharge lamp comprising: a sealed light-transmitting envelope, a discharge-supporting filling in said envelope including metal salt substantially in excess of the quantity vaporized in operation of said lamp, the excess of said metal salt being liquid at the temperature of the walls of said envelope during operation, electrode means for supporting a discharge within said envelope, and a coating within said envelope promoting the formation of a film of said excess salt on the walls, said coating comprising particles of refractory metal oxides, oxynitrides or nitrides in generally block-like or spherical or fiber-like shapes laid down substantially in a monolayer with the distances between particles being of the order of the particle dimensions.
Claim 3
Dependent Claim
20 words
A lamp as in claim 1 wherein the mean particle size is in the range from 1 to 20 microns.
Claim 4
Dependent Claim
22 words
A lamp as in claim 1 wherein the particles are short fibers with diameters in the range of 1 to 20 microns.
Claim 5
Dependent Claim
20 words
A lamp as in claim 3 wherein the fiber length averages in the range of 5 to 10 fiber diameters.
Claim 6
Dependent Claim
12 words
A lamp as in claim 1 wherein the particles are aluminum oxide.
Claim 7
Dependent Claim
86 words
A high intensity metal vapor discharge lamp comprising: a sealed light-transmitting envelope, a discharge-supporting filling in said envelope including metal salt substantially in excess of the quantity vaporized in operation of said lamp the excess of said metal salt being liquid at the temperature of the walls of said envelope during operation, electrode means for supporting a discharge within said envelope, and a coating within said envelope comprising refractory metal oxide, oxynitride or nitride fibers attached to the envelope walls and forming a relatively open structure.
Claim 8
Dependent Claim
86 words
A high intensity metal vapor discharge lamp comprising: a sealed light-transmitting envelope, a discharge-supporting filling in said envelope including metal salt substantially in excess of the quantity vaporized in operation of said lamp the excess of said metal salt being liquid at the temperature of the walls of said envelope during operation, electrode means for supporting a discharge within said envelope, and a coating within said envelope comprising refractory metal oxide, oxynitride or nitride fibers attached to the envelope walls and forming a relatively open structure.
Claim 9
Dependent Claim
35 words
A lamp as in claim 6 wherein the fibers form a structure whose free volume can take up a much greater quantity of liquid condensate than would adhere to the fibers by simple capillary action.
Claim 10
Dependent Claim
37 words
A lamp as in claim 6 wherein the fibers form a structure open to such extent that it scatters and absorbs much less light than would a coating made up of non-fibrous material of equal free volume.
Claim 11
Dependent Claim
39 words
A lamp as in claim 6 wherein the fibers are piled at random to form a fiber-pile coating having a large capacity for taking up liquid condensate and a low scattering and absorption effect on light from the arc.
Claim 12
Dependent Claim
12 words
A lamp as in claim 6 wherein the fibers are primarily alumina.
Claim 13
Dependent Claim
21 words
A lamp as in claim 6 wherein the fibers are alumina and bound together by silica where they touch one another.
Claim 14
Dependent Claim
27 words
A lamp as in claim 6 wherein the fibers have diameters in the range of 1 to 20 microns and the coating is several fiber diameters thick.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |