US4924141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum oxide reflector layer for fluorescent lamps
Assignee: Osram Sylvania Inc
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Filing: 1986-11-12
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Granted: 1990-05-08
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Expires: 2006-11-12
Abstract
Abstract An improved fluorescent lamp is disclosed. The lamp of the present invention includes an envelope containing an ionizable medium including mercury and having electrodes located within the envelope; an aluminum oxide reflector layer on the inner surface of the envelope, and a phosphor layer disposed on the reflector layer. The aluminum oxide reflector layer comprises particles of high purity aluminum oxide having an average particle size greater than 0.5 micrometer and less than or equal to about 1 micrometer and having a surface area of about 4 to 6 meter 2 /gram. The aluminum oxide reflector layer preferably includes at least 95 weight percent alpha-alumina. Preferred coating weights for the reflector layer are from about 8.8 to about 11.1 milligram/square centimeter.
Inventors
- 👤 Fred R. Taubner
- 👤 Richard L. Doucette
- 👤 Gerald B. Fredrickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:39
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
83 words
A fluorescent lamp comprising: an envelope containing an ionizable medium including mercury and having electrodes located therein; an aluminum oxide reflector layer on the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; and a phosphor layer disposed upon said reflector layer within said envelope.
Claim 2
Dependent Claim
83 words
A fluorescent lamp comprising: an envelope containing an ionizable medium including mercury and having electrodes located therein; an aluminum oxide reflector layer on the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; and a phosphor layer disposed upon said reflector layer within said envelope.
Claim 3
Dependent Claim
26 words
A fluorescent lamp in accordance with claim 1 wherein said aluminum oxide reflector layer has a coating weight of about 8.8 to about 11.1 milligrams/square centimeter.
Claim 4
Dependent Claim
21 words
A fluorescent lamp in accordance with claim 1 wherein said aluminum oxide reflector comprises at least 99% by weight aluminum oxide.
Claim 5
Dependent Claim
21 words
A fluorescent lamp in accordance with claim 1 wherein the aluminum oxide reflector layer comprises at least 95 weight percent alpha-alumina.
Claim 6
Dependent Claim
22 words
A fluorescent lamp in accordance with claim 4 wherein the aluminum oxide particles have an average particle size of about 0.85 micrometer.
Claim 7
Dependent Claim
127 words
An aperture fluorescent reprographic lamp comprising: an elongated vitreous glass envelope containing an ionizable medium including mercury and having electrodes at each end of said envelope; an aluminum oxide reflector layer on the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; a protective coating comprising submicron particle aluminum oxide disposed on the reflector layer and upon the portion of the inner surface of said envelope not covered with said reflector layer; and a phosphor layer disposed on that portion of said protective coating disposed on the reflector layer.
Claim 8
Dependent Claim
127 words
An aperture fluorescent reprographic lamp comprising: an elongated vitreous glass envelope containing an ionizable medium including mercury and having electrodes at each end of said envelope; an aluminum oxide reflector layer on the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; a protective coating comprising submicron particle aluminum oxide disposed on the reflector layer and upon the portion of the inner surface of said envelope not covered with said reflector layer; and a phosphor layer disposed on that portion of said protective coating disposed on the reflector layer.
Claim 9
Dependent Claim
28 words
An aperture fluorescent reprographic lamp in accordance with claim 6 wherein said aluminum oxide reflector layer has a coating weight of about 8.8 to about 11.1 milligrams/square centimeter.
Claim 10
Dependent Claim
24 words
An aperture fluorescent reprographic lamp in accordance with claim 6 wherein said aluminum oxide reflector layer comprises at least 99% by weight aluminum oxide.
Claim 11
Dependent Claim
24 words
An aperture fluorescent reprographic lamp in accordance with claim 7 wherein the aluminum oxide particles have a medium particle size of about 0.85 micrometers.
Claim 12
Dependent Claim
23 words
An aperture fluorescent reprographic lamp in accordance with claim 9 wherein the aluminum oxide reflector layer comprises at least 95 weight percent alpha-alumina.
Claim 13
Dependent Claim
27 words
An aperture fluorescent reprographic lamp in accordance with claim 10 wherein said aluminum oxide reflector layer comprises greater than or equal to 99.95 weight percent aluminum oxide.
Claim 14
Dependent Claim
25 words
A fluorescent lamp in accordance with claim 5 wherein said aluminum oxide reflector layer comprises greater than or equal to 99.95 weight percent aluminum oxide.
Claim 15
Dependent Claim
26 words
A fluorescent lamp in accordance with claim 1 wherein said aluminum oxide reflector layer has a coating weight of about 6.9 to about 11.1 milligrams/square centimeter.
Claim 16
Dependent Claim
27 words
An aperture fluorescent lamp in accordance with claim 6 wherein said aluminum oxide reflector layer has a coating weight of about 6.9 to about 11.1 milligrams/square centimeter.
Claim 17
Dependent Claim
38 words
An aperture fluorescent lamp in accordance with claim 14 wherein said protective coating is not disposed over said reflector layer and covers only that portion of the inner surface of said envelope not covered with said reflector layer.
Claim 18
Dependent Claim
109 words
An aperture fluorescent reprographic lamp comprising: an elongated vitreous glass envelope containing an ionizable medium including mercury and having electrodes at each end of said envelope; an aluminum oxide reflector layer on a portion of the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; a transparent protective coating disposed on the entire inner surface of said envelope beneath said reflector layer; and a phosphor layer disposed on said reflector layer.
Claim 19
Dependent Claim
109 words
An aperture fluorescent reprographic lamp comprising: an elongated vitreous glass envelope containing an ionizable medium including mercury and having electrodes at each end of said envelope; an aluminum oxide reflector layer on a portion of the inner surface of said envelope, said aluminum oxide reflector layer comprising particles of aluminum oxide having an average particle size greater than 0.5 micrometers and less than or equal to about 1 micrometer and having a surface area of about 4 to about 6 meter 2 /gram; a transparent protective coating disposed on the entire inner surface of said envelope beneath said reflector layer; and a phosphor layer disposed on said reflector layer.
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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |