Patent US2996404A successfully refreshed from Google Patents.
US2996404A
Expired / Lapsed
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Zinc phosphate luminescent screens and method of making same
Assignee: Davohn Corp
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Filing: 1957-04-08
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Granted: 1961-08-15
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Expires: 1977-04-08
Abstract
No abstract record available.
Inventors
- 👤 Feldman Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:48
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; Y; Y10; Y10S; Y10S428/00; Y10S428/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES CONDENSING THE VAPORIZED SOLID COMPONENTS OF ZINC PHOSPHATE AND A VAPORIZED LUMINESCENCE ACTIVATOR MATERIAL WITHIN A HIGH VACUUM ON A SMOOTH SURFACE OF A REFRACTORY NON-OXIDIZING BASE TO FORM A THIN FILM ON SAID BASE CONTAINING SAID SOLID COMPONENTS IN THE CORRECT PROPORTIONS FOR FORMING ZINC PHOSPHATE THEREFROM ON BAKING SAID FILM IN THE PRESENCE OF OXYGEN, AND SUBJECTING SAID FILM AND BASE TO BAKING IN THE PRESENCE OF OXYGEN AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FORM A CRYSTALLINE METAL PHOSPHATE AND RENDER SAID FILM LUMINESCENT.
Claim 2
Independent Claim
98 words
A METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES CONDENSING THE VAPORIZED SOLID COMPONENTS OF ZINC PHOSPHATE AND A VAPORIZED LUMINESCENCE ACTIVATOR MATERIAL WITHIN A HIGH VACUUM ON A SMOOTH SURFACE OF A REFRACTORY NON-OXIDIZING BASE TO FORM A THIN FILM ON SAID BASE CONTAINING SAID SOLID COMPONENTS IN THE CORRECT PROPORTIONS FOR FORMING ZINC PHOSPHATE THEREFROM ON BAKING SAID FILM IN THE PRESENCE OF OXYGEN, AND SUBJECTING SAID FILM AND BASE TO BAKING IN THE PRESENCE OF OXYGEN AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FORM A CRYSTALLINE METAL PHOSPHATE AND RENDER SAID FILM 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 |