US2976249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing calcium halophosphate phosphors
Assignee: Westinghouse Electric Corp
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Filing: 1956-08-29
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Granted: 1961-03-21
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Expires: 1976-08-29
Abstract
No abstract record available.
Inventors
- 👤 Henry W Rimbach
- 👤 Jacob Van Broekhoven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:27
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/0855; C09K11/0861; C09K11/0866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
THE METHOD OF PREPARING A HALOPHOSPHATE PHOSPHOR MATERIAL COMPRISING: THOROUGHLY MIXING CALCIUM OXIDE, PHOSPHORUS PENTOXIDE, MANGANOUS CARBONATE, ANTIMONY TRIOXIDE, STRONTIUM CHLORIDE AND CALCIUM FLUORIDE IN SUCH PROPORTIONS THAT THE METAL TO PHOSPHORUS MOLAR RATIO IS FROM .4.65/3 TO 4.92/3, THE HALIDE TO PHOSPHORUS MOLAR RATIO IS FROM 1.02/6 TO 1.23/6, THE CHLORIDE TO FLUORIDE MOLAR RATIO IS FROM 1:6 TO 1:1, THE ANTIMONY EXPRESSED AS METAL IS FROM ABOUT 1% TO ABOUT 4% BY WEIGHT, AND THE MANGANESE EXPRESSED AS METAL IS FROM
Claim 2
Independent Claim
83 words
THE METHOD OF PREPARING A HALOPHOSPHATE PHOSPHOR MATERIAL COMPRISING: THOROUGHLY MIXING CALCIUM OXIDE, PHOSPHORUS PENTOXIDE, MANGANOUS CARBONATE, ANTIMONY TRIOXIDE, STRONTIUM CHLORIDE AND CALCIUM FLUORIDE IN SUCH PROPORTIONS THAT THE METAL TO PHOSPHORUS MOLAR RATIO IS FROM .4.65/3 TO 4.92/3, THE HALIDE TO PHOSPHORUS MOLAR RATIO IS FROM 1.02/6 TO 1.23/6, THE CHLORIDE TO FLUORIDE MOLAR RATIO IS FROM 1:6 TO 1:1, THE ANTIMONY EXPRESSED AS METAL IS FROM ABOUT 1% TO ABOUT 4% BY WEIGHT, AND THE MANGANESE EXPRESSED AS METAL IS FROM
References Cited (Backward Citations)
US2488733A
Cited
US2579900A
Cited
US2755254A
Cited
GB733145A
Cited
US2772241A
Cited
US2826553A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-20 | 1964-09-19 | 1965-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-20 | 1968-09-19 | 1969-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-20 | 1972-09-19 | 1973-03-21 | $7700.00 | Window Closed / Lapsed |