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:
Jan. 17, 1978
Filed:
Nov. 11, 1975
Applicant:
Inventors:
Roger Robert Gaudette, Hudson, NH (US);
John Leonard Ohlson, Bedford, MA (US);
Patricia Marie Scanlon, Arlington, MA (US);
Assignee:
W. R. Grace & Co., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
260519 ; 71-1 ; 2602 / ; 2604299 ; 2604 / ; 2604381 ; 2604 / ; 2604 / ; 2604 / ; 2604 / ; 26050111 ; 26050112 ; 2605 / ;
Abstract
A novel chelating agent having the formula ##STR1## in whichA. EACH OF X.sub.1, X.sub.2, X.sub.3, and X.sub.4 is a member selected from the group consisting of (i) hydrogen; (ii) an alkyl group having 1-4 carbon atoms; (iii) --CN; (iv) --So.sub.3 M.sub.1 ; (v) --COOM.sub.1 ; (vi) --OM.sub.3 ; (vii) --NO.sub.2 ; (viii) --OH; and (ix) ##STR2## in which each of R.sub.1 and R.sub.2 is an alkyl group having 1-4 carbon atoms;