Nova Patents
JPS542284A

Production of calcium tungstate fluorescent substance

Abstract

PURPOSE:To obtain a CaWO4 fluorescent substance having a narrow grain size distribution and a desired average grain size by mixing a reaction product, CaWO4 precipitate with a soln. of an alkali chloride in an amt. corresponding to the desired average grain size of the fluorescent substance after which the mixt. is dried, calcined, and washed to remove the alkali chloride.

Term

Term ended

Projected expiry passed 8 June 1997, 29.3 years ago.

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Citations
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US6303929B1Cited byUnited States of AmericaApplicant
US6303929B1Cited byUnited States of AmericaApplicant
US6436314B1Cited byUnited States of AmericaApplicant
US6458294B2Cited byUnited States of AmericaApplicant
US5932139ACited byUnited States of AmericaSearch report
WO9525148A1Cited byWorld Intellectual Property Organization (WIPO)International search
JPH07502578ACited byJapanSearch report
US6688789B2Cited byUnited States of AmericaApplicant
US6171443B1Cited byUnited States of AmericaApplicant
US6471887B2Cited byUnited States of AmericaApplicant