Method of screening a color cathode-ray tube
Abstract
Abstract A multiplicity of dots of clear polyvinyl alcohol (PVA) are formed on the inner surface of the screen of a color cathode-ray tube, these dots covering the space separated elemental areas of the screen that are intended to receive deposits of different phosphor materials characteristics of a color tube having a mosaic or triad type of screen. A slurry of colloidal graphite is applied over the entire screen, constituting an overcoat of the PVA dots. The graphite coating is dried to fit it securely to the screen portions that surround the PVA dots. Hydrogen peroxide is applied to the screen to release the adherence of the PVA dots to the screen. A stream of water applied to the screen washes off the PVA dots with their overcoat of colloidal graphite and exposes elemental areas of the screen in which assigned ones of the various color phosphor materials are then deposited.
Inventors
- 👤 Ghulam A Khan
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |