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:
Feb. 10, 1998
Filed:
Mar. 15, 1996
Applicant:
Inventors:
Henricus F Wolters, Echt, NL;
Samuel L Lane, Beaumont, TX (US);
Wim Buijs, Schinnen, NL;
Frank E Herkes, Wilmington, DE (US);
Nicolaas F Haasen, Sittard, NL;
Assignees:
DSM N.V., Heerlen, NL;
E.I. Du Pont Nemours and Company, Wilmington, DE (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
540538 ;
Abstract
Process for the preparation of .epsilon.-caprolactam starting from an aldehyde compound comprising at least one member from among 5-formylvaleric acid, ester or amide in which the aldehyde compound is allowed to react in the presence of ammonia and hydrogen and a subsequent cyclization of the reaction products thus formed (.epsilon.-caprolactam-precursors) to .epsilon.-caprolactam is performed in the presence of water, involved the combination of steps