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. 18, 2001
Filed:
Sep. 17, 1999
Applicant:
Inventors:
Yasuyuki Takigawa, Tokyo, JP;
Hiromi Nakaoka, Tokyo, JP;
Assignee:
ADCHEMCO Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 7/14 ;
U.S. Cl.
CPC ...
C07C 7/14 ;
Abstract
A process is provided for the preparation of high-purity indene. According to the process, impurities are eliminated by crystallization from an indene stock which is available in a concentrated form by distillation of a coal tar fraction and/or a petroleum fraction. High-purity indene having a purity of 99 wt. % or higher can be obtained.