Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1975-04-30
1978-05-02
Sebastian, Leland A.
Compositions
Inorganic luminescent compositions
Tungsten containing
423490, 156624, F21V 900
Patent
active
040873749
ABSTRACT:
The improvement of the electrolytic and additive methods of coloring alkali fluoride crystals comprising the step of selecting an alkali fluoride crystal having the impurities of between 0 and 5 ppmA of OH; between 0 and 50 ppmA of one or more alkaline earth cations, of which between 0 and 10 ppmA Mg.sup.++ and between 0 and 10 ppmA Ca.sup.++ ; between 0 and 50 ppmA of non-fluorine halide anions; between 0 and 10 ppmA of SiF.sub.6.sup.= ; between 0 and 30 ppmA of other ions; and the method of preparing these crystals which comprises converting the alkali fluoride to alkali hydrofluoride, crystallizing and vacuum drying the alkali hydrofluoride crystals, regenerating the alkali fluoride by expelling hydrogen fluoride, and crystallizing the alkali fluoride.
REFERENCES:
patent: 2422907 (1947-06-01), Johnson
patent: 2550173 (1951-04-01), Swinehart et al.
patent: 3238017 (1966-03-01), Yamaguchi et al.
patent: 3282641 (1966-11-01), Sfiligoj et al.
patent: 3476690 (1966-11-01), Carnall
patent: 3565700 (1971-02-01), Root
patent: 3766080 (1973-10-01), Sweinehart et al.
patent: 3935302 (1976-01-01), Pastor et al.
Kirk-Othmer book "Encyclopedia of Chem. Technology," p. 627, vol. 9, 2nd . Ed., 1966, Interscience Pub., N. Y. Copy Scient. Lib.
Collins William C.
Imber Oscar
Klein Philipp H.
Schneider Irwin
McDonnell Thomas
Schneider Philip
Sciascia R. S.
Sebastian Leland A.
The United States of America as represented by the Secretary of
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