US2615821A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making scotophor screens
Assignee: National Union Radio Corp
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Filing: 1949-03-11
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Granted: 1952-10-28
•
Expires: 1969-03-11
Abstract
No abstract record available.
Inventors
- 👤 Levy Gustave
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:43
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
THE METHOD OF FORMING A SCOTOPHOR SCREEN OF ALKALI METAL HALIDE ON THE INNER WALL OF A CATHODE-RAY TUBE AND THE LIKE, WHICH COMPRISES DISCHARGING INTO THE TUBE A SATURATED SOLUTION OF AN ALKALI METAL HALIDE CRYSTAL SCOTOPHOR, ADDING TO THE SATURATED ALKALI METAL HALIDE SOLUTION AT APPROXIMATELY 20* C. A QUANTITY OF THE SAID ALKALI METAL HALIDE SCOTOPHOR, HEATING THE SOLU-
Claim 2
Independent Claim
62 words
THE METHOD OF FORMING A SCOTOPHOR SCREEN OF ALKALI METAL HALIDE ON THE INNER WALL OF A CATHODE-RAY TUBE AND THE LIKE, WHICH COMPRISES DISCHARGING INTO THE TUBE A SATURATED SOLUTION OF AN ALKALI METAL HALIDE CRYSTAL SCOTOPHOR, ADDING TO THE SATURATED ALKALI METAL HALIDE SOLUTION AT APPROXIMATELY 20* C. A QUANTITY OF THE SAID ALKALI METAL HALIDE SCOTOPHOR, HEATING THE SOLU-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |