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. 28, 1981
Filed:
May. 04, 1978
Applicant:
Inventors:
Assignee:
Stamicarbon, B.V., Geleen, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ; C07D / ;
U.S. Cl.
CPC ...
2603 / ; 203 34 ; 203 35 ; 260-23 ; 528490 ; 528491 ;
Abstract
A process is described for the recovery of 2-pyrrolidone monomer from polypyrrolidone waste material by heating the latter in the presence of a small amount of strong acid, and distilling off the said monomer.