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. 10, 1979
Filed:
Jun. 15, 1978
Applicant:
Inventors:
Harry Danziger, Krefeld, DE;
Otto Immel, Krefeld, DE;
Bernd-Ulrich Kaiser, Krefeld, DE;
Guido Rampart, Ekeren, BE;
Hans-Helmut Schwarz, Krefeld, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract
A process for the purification of .epsilon.-caprolactam, wherein .epsilon.-caprolactam is treated with potassium permanganate in the presence of from 0.01 to 5% by weight of water, based on caprolactam, and subsequently crystallized from toluene, benzene, ethylbenzene or xylene.