The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 1996
Filed:
May. 30, 1995
Yuji Kimura, Fukui-ken, JP;
Shigeru Sakai, Fukui-ken, JP;
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Abstract
Proposed is a method for the preparation of a rare earth phosphate powder or, in particular, a composite rare earth phosphate powder of lanthanum, cerium and terbium having properties suitable for use as a base material of phosphors in fluorescent lamps in respect of particle size distribution of 1-10 .mu.m and globular particle configuration. The method is basically a precipitation method by mixing aqueous solutions of a water-soluble salt of the rare earth element or elements and phosphoric acid but the inventive method is characterized by completing introduction of the rare earth salt solution into the phosphoric acid solution within a limited length of time of 3 seconds to 5 minutes at a specified temperature, each of the solutions having a specified concentration.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile