US2546239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing zinc sulfide phosphor
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-12-06
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Granted: 1951-03-27
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Expires: 1967-12-06
Abstract
No abstract record available.
Inventors
- 👤 Rothschild Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:16
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR THE PRODUCTION OF A PHOSPHORESCENT ZINC SULPHIDE WHICH COMPRISES THE STEPS OF MIXING ZINC OXIDE AND SULPHUR IN A PROPORTION TO FORM ZINC SULPHIDE WITH AN EXCESS OF SULPHUR, HEATING THE MIXTURE WITH AN ALKALI HALIDE TO APPROXIMATELY 800* C., MAINTAINING THE MIXTURE AT SUBSTANTIALLY 800* C. FOR AT LEAST ABOUT ONE HOUR, WASHING THE SO-HEATED MATERIAL WITH DILUTE ACID AND THEN WATER TO THEREBY REMOVE UNREACTED ZINC OXIDE FROM THE SO HEATED MATERIAL, MIXING A COPPER ACTIVATOR AND A HALIDE WITH THE SO TREATED MATERIAL, AND HEATING THE SO FORMED MIXTURE IN A NON-REDUCING ATMOSPHERE TO A TEMPERATURE GREATER THAN ABOUT 800* C.
Claim 2
Dependent Claim
107 words
A PROCESS FOR THE PRODUCTION OF A PHOSPHORESCENT ZINC SULPHIDE WHICH COMPRISES THE STEPS OF MIXING ZINC OXIDE AND SULPHUR IN A PROPORTION TO FORM ZINC SULPHIDE WITH AN EXCESS OF SULPHUR, HEATING THE MIXTURE WITH AN ALKALI HALIDE TO APPROXIMATELY 800* C., MAINTAINING THE MIXTURE AT SUBSTANTIALLY 800* C. FOR AT LEAST ABOUT ONE HOUR, WASHING THE SO-HEATED MATERIAL WITH DILUTE ACID AND THEN WATER TO THEREBY REMOVE UNREACTED ZINC OXIDE FROM THE SO HEATED MATERIAL, MIXING A COPPER ACTIVATOR AND A HALIDE WITH THE SO TREATED MATERIAL, AND HEATING THE SO FORMED MIXTURE IN A NON-REDUCING ATMOSPHERE TO A TEMPERATURE GREATER THAN ABOUT 800* C.
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) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |