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:
Dec. 08, 1998
Filed:
Oct. 24, 1997
Applicant:
Inventors:
Isao Hashiba, Funabashi, JP;
Kenichi Tokunaga, Funabashi, JP;
Assignee:
Nissan Chemical Industries, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ; C07F / ;
U.S. Cl.
CPC ...
562-8 ; 558180 ;
Abstract
To provide 2,5-dicarboxyphenyl phosphonic acid and a process for the preparation thereof, comprising the steps of: forming a reaction liquid phase by supplying a 2,5-dialkylphenyl phosphonic acid, a solvent, a cobalt salt, a manganese salt and/or a cerium salt, and bromine or a bromine compound into a reaction zone; and supplying oxygen into the reaction liquid phase by bringing an oxygen-containing gas into contact with the reaction liquid phase by supplying an oxygen-containing gas into the above-mentioned reaction zone.