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. 08, 1980
Filed:
Mar. 19, 1979
Applicant:
Inventors:
Hobe Schroeder, Warrenville, IL (US);
Delbert H Meyer, Naperville, IL (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
2603467 ; 2603464 ;
Abstract
Bromine-substituted oxygen-containing impurities in phthalic anhydride which cannot be removed therefrom by distillation or a combination of heat treatment in the presence of a metal or a combination of catalytic hydrogenation and fractional distillation are removed by treating a mixture of vapors of such impure phthalic anhydride and water with a palladium catalyst prior to taking phthalic anhydride as a product fraction of fractional distillation.
Schroeder, Hobe. (1980). Removal of bromine from phthalic anhydride (U.S. Patent No. 4197247). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4197247
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile