Patent US4515827A successfully refreshed from Google Patents.
US4515827A
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Method of vapor coating phosphor particles
Assignee: Osram Sylvania Inc
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Filing: 1982-06-17
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Granted: 1985-05-07
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Expires: 2002-06-17
Abstract
Abstract Red cathode ray phosphors are coated with a vapor deposited layer of cadmium selenide in order to achieve controlled color shifts in the light output of the phosphors. Such coated phosphors are especially suited for color television and monitor applications.
Inventors
- 👤 Robert E. Dodds
- 👤 David J. Harrigan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:01
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A method for producing a composite article of manufacture comprising a phosphor particle and a continuous coating on the surface of the particle, the method comprising: (a) evacuating a chamber containing: phosphor particles; means to rotate the phosphor particles; a color modifying material; and heating means to vaporize the color modifying material; (b) rotating the phosphor particles while; (c) heating the color modifying material to vaporize it, whereby the color modifying material is vapor deposited on the rotating phosphor particles to form a continuous coating.
Claim 2
Independent Claim
85 words
A method for producing a composite article of manufacture comprising a phosphor particle and a continuous coating on the surface of the particle, the method comprising: (a) evacuating a chamber containing: phosphor particles; means to rotate the phosphor particles; a color modifying material; and heating means to vaporize the color modifying material; (b) rotating the phosphor particles while; (c) heating the color modifying material to vaporize it, whereby the color modifying material is vapor deposited on the rotating phosphor particles to form a continuous coating.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein the phosphor particles are rotated by mechanically vibrating the particles.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the phosphor particles are a red-emitting cathode ray phosphor selected from the group consisting of europium-activated yttrium oxide, europium-activated yttrium oxysulfide, and europium-activated yttrium orthovanadate.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the color modifying material is a red pigment.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the color modifying material is cadmium sulfoselenide.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the chamber is evacuated to a vacuum of at least 2×10 -5 torr.
Claim 8
Dependent Claim
39 words
The method of claim 5 wherein the heating is carried out within the range of about 1400° C. to 1550° C. for from 10 seconds to two minutes, resulting in a coating thickness of from 10 to 2000 angstroms.
References Cited (Backward Citations)
US4049845A
Cited
US4128674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-06 | 1988-11-05 | 1989-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-06 | 1992-11-05 | 1993-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-06 | 1996-11-05 | 1997-05-07 | $7700.00 | Window Closed / Lapsed |