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. 05, 1992
Filed:
Aug. 16, 1990
Applicant:
Inventors:
Jon C Thunberg, Milford, NH (US);
Steven P VanKouwenberg, Raymond, NH (US);
Walter B Begonis, Reading, MA (US);
Assignee:
W.R. Grace & Co.-Conn., New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
556148 ;
Abstract
A process of preparing iron chelates of amino and hydroxy carboxylic acids, comprising reacting an oxide of iron with an amino or hydroxy carboxylic acid and a base in the presence of ferrous ion or metallic iron as a catalyst. Additional base is added to the resulting chelant and oxidation may be carried out to convert any ferrous ion to ferric.