Patent US3681111A successfully refreshed from Google Patents.
US3681111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of a color picture tube
Assignee: Zenith Electronics LLC
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Filing: 1970-08-24
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Granted: 1972-08-01
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Expires: 1990-08-24
Abstract
Abstract THE MOSAIC IMAGE SCREEN OF A SHADOW MASK COLOR TUBE HAS A PLURALITY OF INTERLACED SETS OF ELEMENTAL SCREEN AREAS, EACH OF WHICH AREAS INCLUDES A PHOSPHOR OF A PARTICULAR COLOR AND A FILTER WHICH IS TRANSMISSIVE OF THAT COLOR BUT, OTHERWISE, IS ESSENTIALLY A VISIBLE LIGHT ATTENUATOR. THE FILTERS OF AT LEAST ONE OF THESE INTERLACED SETS OF ELEMENTAL SCREEN AREAS ARE FORMED OF DISCRETE SPHERES OF A GLASS THAT PREFERABLY HAS A LOW INDEX OF REFLECTION AND A FUSION OR SOFTENING TEMPERATURE SO HIGH IN RELATION TO THE PROCESSING TEMPERATURES OF THE TUBE THAT THE SPHERES DO NOT BECOME FUSED TO THE FACEPLATE OF THE TUBE.
Inventors
- 👤 Sam H Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:17
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |