US3552818A
Expired / Lapsed
US
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Method for processing a cathode ray tube having improved life
Assignee: GTE Sylvania Inc
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Filing: 1968-07-18
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Granted: 1971-01-05
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Expires: 1988-07-18
Abstract
Abstract A METHOD FOR PROCESSING AN IMPROVED CATHODE RAY TUBE EMPLOYING AN OPEN METALLIC STRUCTURE POSITIONED RELATIVE TO THE SCREEN, FOR EXAMPLE, A SHADOW MASK COLOR TUBE WHEREIN THE MASK IS A CONTINUOUS SELECTED GASEOUS GIVING MECHANISM DURING TUBE OPERATION. DURING TUBE PROCESSING THE MASK SORBS A SELECTED INTRODUCED GAS SUCH AS HYDROGEN. ELECTRON BEAM IMPINGEMENT OF THE MASK DURING SUBSEQUENT TUBE OPERATION EFFECTS GRADUAL RELEASE OF THE OCCLUDED SELECTED GAS FROM THE MASK TO PROVIDE A REPLENISHABLE PARTIAL PRESSURE OF HYDROGEN WHICH IN RELATION TO THE TOTAL TUBE PRESSURE IS CONSISTENT FOR THE PROMOTION OF ENHANCED EMISSION AND EXTENDED TUBE LIFE.
Inventors
- 👤 David Benda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:38
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/38; H01J9/395; H01J29/00; H01J29/94
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |