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:
Apr. 06, 2021
Filed:
Sep. 14, 2018
Applicant:
Covestro Deutschland Ag, Leverkusen, DE;
Inventors:
Dorota Greszta-Franz, Solingen, DE;
Christian Drumm, Frohnhofen, DE;
Jan Morbach, Cologne, DE;
Reiner Witkowski, Bottrop, DE;
Assignee:
Covestro Deutschland AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 227/40 (2006.01); C07C 229/24 (2006.01); C07C 227/06 (2006.01);
U.S. Cl.
CPC ...
C07C 227/40 (2013.01); C07C 227/06 (2013.01); C07C 229/24 (2013.01);
Abstract
The present invention relates to a method for purifying polyaspartic acid ester compositions and to the provision of polyaspartic acid ester compositions that contain 0.01 to <2% by weight fumaric acid dialkyl esters.