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:
Feb. 06, 1979
Filed:
Jul. 11, 1977
Applicant:
Inventors:
John D Bacha, Monroeville, PA (US);
Charles M Selwitz, Monroeville, PA (US);
Assignee:
Gulf Research & Development Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603463 ; 2603464 ; 2603467 ;
Abstract
A process for the simultaneous production and purification of 4-nitro-o-phthalic anhydride which comprises subjecting an impure mixture containing 4-nitro-o-phthalic acid to azeotropic dehydration with selected azeotroping agents.