US2996403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal silicate luminescent screens and method of making same
Assignee: Davohn Corp
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Filing: 1957-04-05
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Granted: 1961-08-15
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Expires: 1977-04-05
Abstract
No abstract record available.
Inventors
- 👤 Feldman Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:18
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
102 words
A METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES CONDENSING THE VAPORIZED SOLID COMPONENTS OF A METAL SILICATE PHOSPHOR 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 THE METAL SILICATE THEREFROM ON BAKING OF 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 SILICATE AND RENDER SAID FILM LIMINESCENT.
Claim 2
Independent Claim
102 words
A METHOD OF MAKING A LUMINESCENT SCREEN WHICH COMPRISES CONDENSING THE VAPORIZED SOLID COMPONENTS OF A METAL SILICATE PHOSPHOR 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 THE METAL SILICATE THEREFROM ON BAKING OF 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 SILICATE AND RENDER SAID FILM LIMINESCENT.
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 |