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:
May. 04, 1982
Filed:
Jan. 17, 1980
Applicant:
Inventor:
Peter Hanssle, Haltern, DE;
Assignee:
Chemische Werke Huels, A.G., Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
2604 / ; 562512 ; 562606 ; 585514 ; 2524 / ; 260440 ; 260446 ; 260447 ; 568-8 ; 568 14 ;
Abstract
A process for preparing a secondary or tertiary 2-carboxyethyl- or carboxymethylphosphine or a salt thereof comprises saponifying the corresponding cyanoalkyl phosphine with an aqueous-alcoholic alkali metal hydroxide solution, to prepare the alkali metal salt of the corresponding phosphino carboxylic acid, treating an aqueous solution of the acid salt so produced with a strongly acidic ion exchanger, and neutralizing the resultant free acid with an alkali metal hydroxide, ammonia or an amine when a salt thereof is to be prepared.