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. 27, 1993
Filed:
Aug. 29, 1991
Applicant:
Inventors:
Karl W Seper, Youngstown, NY (US);
Edward J Colman, Niagara Falls, NY (US);
David Y Tang, E. Amherst, NY (US);
Mary K Cocoman, Grand Island, NY (US);
Harry E Buckholtz, Lewiston, NY (US);
Assignee:
Occidental Chemical Corporation, Niagara Fails, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549246 ; 549247 ; 558415 ; 562849 ; 562853 ; 562855 ;
Abstract
A process for the preparation of a halophthalic anhydride, such as chlorophthalic anhydride, comprising the liquid phase reaction of bromine with a halogen substituted hexa- or tetra-hydrophthalic anhydride to produce halophthalic anhydride and gaseous HBr, and reacting the gaseous HBr with chlorine to regenerate bromine.