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:
Aug. 31, 1999
Filed:
Sep. 05, 1997
Takahumi Yoshimura, Tukuba, JP;
Koichi Kanno, Tukuba, JP;
Yasuhiro Hirai, Tukuba, JP;
Yukio Sakai, Tukuba, JP;
Nobuyuki Koike, Tukuba, JP;
Yuzuru Takahashi, Tukuba, JP;
Hitoshi Sakamoto, Tukuba, JP;
Jitsuo Oishi, Tukuba, JP;
Takaaki Higashiizumi, Tukuba, JP;
Kyoko Shibahara, Tukuba, JP;
Abstract
A method for preparing a modified optically isotropic pitch comprising, preparing a synthetic pitch by reacting a member selected from the group consisting of a conjugated polycyclic hydrocarbon containing a low molecular weight alkyl group or a material containing such a substituted hydrocarbon in the presence of hydrofluoric acid/boron trifluoride, and treating the synthetic pitch by passing an oxidizing gas through the synthetic pitch at elevated temperatures.