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. 11, 1993
Filed:
Jun. 17, 1992
Applicant:
Inventors:
Michael S Chen, Zionsville, PA (US);
Philip J Cook, Schnecksville, PA (US);
Harold H Gunardson, New Tripoli, PA (US);
Melinda B Ulrich, Annandale, NJ (US);
Assignee:
Air Products and Chemicals, Inc., Allentown, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549247 ; 549248 ; 549250 ;
Abstract
The present invention is an improvement to the conventional process for the production of phthalic anhydride. In particular, the present invention enables the crude phthalic anhydride product to be recovered in a more efficient manner.