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. 31, 1992
Filed:
Apr. 02, 1991
Applicant:
Inventor:
Klaus-Dieter Steffen, Hennef, DE;
Assignee:
Huels Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548537 ;
Abstract
The preparation of 3-carboxamido-5-vinyl-2-pyrrolidone from a 2-vinylcyclopropyl-1,1-dicarboxylic acid dialkyl ester and ammonia is improved with respect to yield and purity of the end product by addition of an alkali metal alcoholate and a polymerization inhibitor.