US4952422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A method of coating a layer of an yttrium vanadate phosphor contained in a fluorescent lamp with Y2 O3 or Al2 O3 and lamps made therefrom
Assignee: Osram Sylvania Inc
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Filing: 1988-02-29
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Granted: 1990-08-28
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Expires: 2008-02-29
Abstract
Abstract A fluorescent lamp containing a Y 2 O 3 or Al 2 O 3 coating on a layer of yttrium vanadate phosphor and a method of coating the layer of the yttrium vanadate phosphor with a continuous protective coating of Y 2 O 3 or Al 2 O 3 is described. The method comprises applying a coating of a metal, such as yttrium or aluminum, on the yttrium vanadate phosphor then lehring the metallic coating at about 500° C. to about 625° C. to form a continuous protective coating of Y 2 O 3 or Al 2 O 3 overlaying the layer of phosphor.
Inventors
- 👤 Romano G. Pappalardo
- 👤 Thomas E. Peters
- 👤 Roger B. Hunt, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:01
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/77; C09K11/7766; C09K11/7776; C09K11/7783; C09K11/7794
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A process for applying a continuous protective coating of an oxide overlying a layer of yttrium vanadate phosphor comprising the following steps: Step 1--applying a physical vapor deposition (PVD) coating of a metal of said oxide on said phosphor to form a metallic coating; and Step 2--lehring said metallic coating at about 500° C. to about 625° C. to form a continuous protective coating of said oxide overlying said layer of yttrium vanadate phosphor.
Claim 2
Dependent Claim
74 words
A process for applying a continuous protective coating of an oxide overlying a layer of yttrium vanadate phosphor comprising the following steps: Step 1--applying a physical vapor deposition (PVD) coating of a metal of said oxide on said phosphor to form a metallic coating; and Step 2--lehring said metallic coating at about 500° C. to about 625° C. to form a continuous protective coating of said oxide overlying said layer of yttrium vanadate phosphor.
Claim 3
Dependent Claim
12 words
A process in accordance with claim 1 wherein said oxide comprises yttria.
Claim 4
Dependent Claim
12 words
A process in accordance with claim 1 wherein said oxide comprises alumina.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |