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:
Mar. 05, 2002
Filed:
Sep. 27, 2000
Applicant:
Inventors:
Denis Huguenin, Asnieres-sur-Seine, FR;
Pierre Macaudiere, Asnieres-sur-Seine, FR;
Rachid Mahiou, Clairmont-Ferrand, FR;
Assignee:
Rhodia Chimie, Boulogne Billancourt Cedex, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01F 1/700 ;
U.S. Cl.
CPC ...
C01F 1/700 ;
Abstract
The present invention provides a process for preparing a rare earth borate by reacting together at least one rare earth salt, boric acid and a base. The process is characterized in that the reaction is carried out using an excess of acid with respect to the stoichiometry and under conditions such that the pH of the reaction medium at the end of the reaction is in the range of 6 to 8. The precipitate formed is then recovered and calcined. The phase purity of the borate obtained is good and it can be used as a luminophore.