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:
Sep. 22, 1992
Filed:
Mar. 19, 1991
Applicant:
Inventors:
Hiroshi Furukawa, Kawagoe, JP;
Hiroyuki Inagaki, Saitama, JP;
Masaharu Ishii, Saitama, JP;
Hiroshi Ueno, Saitama, JP;
Assignee:
Tonen Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549237 ; 549236 ;
Abstract
Methylnorbornene dicarboxylic anhydride is produced from a C.sub.6 -C.sub.7 fraction containing 5-methylcyclopentadiene by carrying out the reaction in the presence of a maleic anhydride and a protonic acid at a temperature of 0.degree.-50.degree.C., whereby the 5-methylcyclopentadiene is isomerized to 1-MCPD and 2-MCPD which undergo a Diels-Alder reaction to form methylnorbornene dicarboxylic anhydride.