US3712815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a display screen
Assignee: Westinghouse Electric Corp
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Filing: 1970-06-30
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Granted: 1973-01-23
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Expires: 1990-06-30
Abstract
Abstract AN IMPROVED METHOD OF MANUFACTURING A DISPLAY SCREEN FOR A CATHODE RAY TUBE IN WHICH A LIGHT ABSORBING COATING IS PROIDED ON THE DISPLAY SCREEN AND SURROUNDS THE PHOSPHOR ELEMENTS POSITIONED ON THE DISPLAY SCREEN. THIS IS ACCOMPLISHED BY PROVIDING AN ARRAY OF POLYVINYL ALCOHOL (PVA) DOTS ON THE FACEPLATE CORRESPONDING TO THE DESIRED PHOSPHOR ARRAYS, PROVIDING A COATING OF LIGHT ABSORBING MATERIAL OVER THE PVA DOTS AND THE INTERVENING EXPOSED SURFACES OF THE FACEPLATE, AND THEN REMOVING THE PVA DOTS AND THE OPAQUE COATING COVERING THE DOTS BY CHEMICALLY DEVELOPING THE PVA DOTS WITH A SUITABLE OXIDIZING AGENT SUCH AS HYDROGEN PEROXIDE AND A CHELATING AGENT.
Inventors
- 👤 K Rohrer
- 👤 D Griswold
- 👤 D Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:53
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/04; H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2278
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |