US3657142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zinc sulfide phosphors
Assignee: STANLEY M POSS
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Filing: 1971-04-19
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Granted: 1972-04-18
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Expires: 1991-04-19
Abstract
Abstract ZINC SULFIDE PHOSPHORS ARE DISCLOSED THAT CONSIST ESSENTIALLY OF A MAJOR AMOUNT OF ZINC SULFIDE AS THE HOST, FROM ABOUT 0.001% TO ABOUT 0.05% BY WEIGHT OF COPPER AND AS A CO-ACTIVATOR AND AMOUNT OF METAL SELECTED FROM THE GROUP CONSISTING OF FROM ABOUT 0.01% TO ABOUT 0.09% BY WEIGHT OF SILVER AND FROM ABOUT 0.004% TO ABOUT 0.009% BY WEIGHT OF BISMUTH. A PROCESS FOR PRODUCING SAID PHOSPHORS IS DISCLOSED THAT COMPRISES FORMING A BLEND OF ZINC SULFIDE, COPPER SALTS AND THE FOREGOING OTHER METAL SALTS, HEAT TREATING UNDER CONTROLLED TEMPERATURE AND ATMOSPHERIC CONDITIONS AND COOLING UNDER CONTROLLED ATMOSPHERIC CONDITIONS.
Inventors
- 👤 Stanley M Poss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:56
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/74; C09K11/7407; C09K11/7414
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |