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. 20, 2012
Filed:
Apr. 18, 2006
Applicants:
Oskar Axelsson, Hagan, NO;
Andreas Olsson, Malmo, SE;
Inventors:
Oskar Axelsson, Hagan, NO;
Andreas Olsson, Malmo, SE;
Assignee:
GE Healthcare AS, Oslo, NO;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 257/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
The invention relates to an improved process for preparation of protected DO3A, such as DO3A-tri-t-butyl ester (1,4,7,10-tetraazacyclododecane-1,4,7-triacetic acid tri-t-butyl ester). The compound is prepared as a salt. The process includes a work-up procedure giving DO3A-tri-t-butyl ester as a salt of excellent purity.