Method of processing a black surround screen
Abstract
Abstract The faceplate of a color cathode-ray tube is covered with a layer of sensitized polyvinyl alcohol and is exposed through the shadow mask of the tube to establish images of the elemental areas of the screen that are to receive deposits of phosphor. These images are developed by treating the screen with water which removes the unexposed portions of the layer and then the screen is baked to render the images opaque to actinic radiation. The screen next receives a second coating of a similar photosensitive material including a pigment having lightabsorbing capabilities. Exposing the screen from the surface opposite that which has been coated and treating with the solvent of the second layer washes away the portions of that layer which overlie the opaque dot images. Thereafter, phosphor is deposited on assigned series of the dot images and a final baking step removes the polyvinyl alcohol, leaving on the screen phosphor dot deposits individually surrounded by light-absorbing pigment.
Inventors
- 👤 Sam H Kaplan
Bibliographic Details
Claims Analysis
Total Claims: 2References 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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |