US3157602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing pyrosilicate phosphors
Assignee: GTE Sylvania Inc
•
Filing: 1961-12-28
•
Granted: 1964-11-17
•
Expires: 1981-12-28
Abstract
No abstract record available.
Inventors
- 👤 Richard C Ropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:29
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/59
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN THE PROCESS OF PREPARING PHOSPHORS OF THE CLASS M2NSI2O7, WHERE M IS AT LEAST ONE ALKALINE EARTH METAL AND N IS AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ZINC AND CADMIUM, THE STEPS WHICH COMPRISE: MIXING TOGETHER INGREDIENTS NECESSARY TO FORM A PHOSPHOR OF SAID CLASS AND INCLUDING IN SAID PHOSPHOR MIXTURE 0.01 TO 0.30 MOLE OF FLUORIDE FLUX PER MOLE OF PYROSILICATE; FIRING SAID MIXTURE IN A FIRST FIRING AND THEN ADMIXING THE PRODUCT OF SAID FIRST FIRING WITH 0.5 TO 12% BY WEIGHT CHLORIDE FLUX AND 0.5 TO 10% BY WEIGHT FLUORIDE FLUX; FIRING THE ADMIXTURE AND RECOVERING A PHOSPHOR OF SAID CLASS M2NSI2O7, SAID FLUXES HAVING AT LEAST ONE CATION SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH METALS, AMMONIA, MAGNESIUM, CADMIUM, ZINC, ALUMINUM AND LEAD.
Claim 2
Dependent Claim
134 words
IN THE PROCESS OF PREPARING PHOSPHORS OF THE CLASS M2NSI2O7, WHERE M IS AT LEAST ONE ALKALINE EARTH METAL AND N IS AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF MAGNESIUM, ZINC AND CADMIUM, THE STEPS WHICH COMPRISE: MIXING TOGETHER INGREDIENTS NECESSARY TO FORM A PHOSPHOR OF SAID CLASS AND INCLUDING IN SAID PHOSPHOR MIXTURE 0.01 TO 0.30 MOLE OF FLUORIDE FLUX PER MOLE OF PYROSILICATE; FIRING SAID MIXTURE IN A FIRST FIRING AND THEN ADMIXING THE PRODUCT OF SAID FIRST FIRING WITH 0.5 TO 12% BY WEIGHT CHLORIDE FLUX AND 0.5 TO 10% BY WEIGHT FLUORIDE FLUX; FIRING THE ADMIXTURE AND RECOVERING A PHOSPHOR OF SAID CLASS M2NSI2O7, SAID FLUXES HAVING AT LEAST ONE CATION SELECTED FROM THE GROUP CONSISTING OF ALKALINE EARTH METALS, AMMONIA, MAGNESIUM, CADMIUM, ZINC, ALUMINUM AND LEAD.
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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |