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:
May. 03, 1977
Filed:
Aug. 01, 1975
Applicant:
Inventors:
Abraham H De Rooij, Geleen, NL;
Jan Elmendorp, Brunssum, NL;
Assignee:
Stamicarbon B.V., Geleen, NL;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2602 / ;
Abstract
In commercial processes for producing epsilon-caprolactam, the caprolactam product is in admixture with sulfuric acid. An improved process for removing sulfuric acid from the caprolactam results from treating the admixture with ammonia at superatmospheric pressure.