US2996402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making zinc sulfide luminescent screens
Assignee: Davohn Corp
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Filing: 1957-04-02
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Granted: 1961-08-15
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Feldman Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:53
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES THE STEPS CARRIED OUT WITHIN A HIGH VACUUM OF SLOWLY VAPORIZING ZINC SULFIDE, CONDENSING THE VAPORS ON A SMOOTH SURFACE OF A REFRACTORY BASE TO FORM A THIN FILM ON SAID BASE AND SUBJECTING SAID FILM AND BASE WITH AN ACTIVATOR OF LUMINESCENCE IN SAID FILM TO BAKING AT A TEMPERATURE BETWEEN ABOUT 750 TO 900*C. FOR A TIME SUFFICIENT TO RENDER SAID FILM CRYSTALLINE, TRANSPARENT AND LUMINESCENT.
Claim 2
Independent Claim
77 words
THE METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES THE STEPS CARRIED OUT WITHIN A HIGH VACUUM OF SLOWLY VAPORIZING ZINC SULFIDE, CONDENSING THE VAPORS ON A SMOOTH SURFACE OF A REFRACTORY BASE TO FORM A THIN FILM ON SAID BASE AND SUBJECTING SAID FILM AND BASE WITH AN ACTIVATOR OF LUMINESCENCE IN SAID FILM TO BAKING AT A TEMPERATURE BETWEEN ABOUT 750 TO 900*C. FOR A TIME SUFFICIENT TO RENDER SAID FILM CRYSTALLINE, TRANSPARENT AND LUMINESCENT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |