US4208461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated phosphors and articles employing same
Assignee: Verizon Corporate Services Group Inc
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Filing: 1978-12-06
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Granted: 1980-06-17
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Expires: 1998-12-06
Abstract
Abstract The disposition of an array of color phosphor dots on a color cathode ray tube faceplate by conventional photo deposition techniques is facilitated by first coating the individual phosphor particles with polyvinyl alcohol modified with an amino acid such as glutamic or aspartic acid.
Inventors
- 👤 Clarence D. Vanderpool
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:26
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J29/225; C; C09; C09K; C09K11/00; C09K11/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24901; Y10T428/24926; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
An article of manufacture comprising an array of dots on a cathode ray tube faceplate, the dots comprising coated particles of a cathode ray phosphor distributed in a matrix of a photoresist, the particle coating comprising polyvinyl alcohol modified with from 30 to 80 weight percent of an amino acid selected from the group consisting of glutamic and aspartic acid.
Claim 2
Dependent Claim
60 words
An article of manufacture comprising an array of dots on a cathode ray tube faceplate, the dots comprising coated particles of a cathode ray phosphor distributed in a matrix of a photoresist, the particle coating comprising polyvinyl alcohol modified with from 30 to 80 weight percent of an amino acid selected from the group consisting of glutamic and aspartic acid.
Claim 3
Dependent Claim
17 words
The article of claim 1 wherein the coating comprises polyvinyl alcohol and at least one polymerization agent.
Claim 4
Dependent Claim
12 words
The article of claim 2 wherein the polymerization agent is tannic acid.
Claim 5
Dependent Claim
24 words
The article of claim 2 wherein the polymerization agent is present in the amount of about 125 to 200 weight percent of the coating.
Claim 6
Dependent Claim
14 words
The article of claim 1 wherein the phosphor particle is a cathode ray phosphor.
Claim 7
Dependent Claim
26 words
The article of claim 5 wherein the phosphor particle is selected from the group consisting of red, blue and green emitting color cathode ray tube phosphors.
Claim 8
Dependent Claim
25 words
The article of claim 5 wherein the red phosphor is selected from the group consisting of europium activated yttrium oxide and europium activated yttrium oxysulfide.
Claim 9
Dependent Claim
11 words
The article of claim 5 wherein the blue phosphor is ZnS:Ag.
Claim 10
Dependent Claim
19 words
The article of claim 5 wherein the green phosphor is selected from the group consisting of ZnCdS:Cu,Al and ZnS:Cu,Al.
References Cited (Backward Citations)
US3875449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-17 | 1983-12-17 | 1984-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-17 | 1987-12-17 | 1988-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-17 | 1991-12-17 | 1992-06-17 | $7700.00 | Window Closed / Lapsed |