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:
Aug. 17, 1993
Filed:
Jul. 30, 1992
Applicant:
Inventors:
Joseph F Englert, Jr, La Place, LA (US);
Willie Harrison, Jr, New Orleans, LA (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
570228 ; 570226 ; 570230 ; 570238 ;
Abstract
Quaternary ammonium phase transfer catalyst is removed from the dehydrochlorination product of 3,4-dichlorobutene-1 by treatment of the organic, chloroprene-containing phase with an oxy acid which combines with the catalyst to form a separate phase.