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:
Oct. 11, 1994
Filed:
Mar. 31, 1993
Wataru Yamashita, Kanagawa, JP;
Yoshihiro Sakata, Kanagawa, JP;
Toshiyuki Kataoka, Kanagawa, JP;
Yuichi Okawa, Kanagawa, JP;
Hideaki Oikawa, Kanagawa, JP;
Tadashi Asanuma, Kanagawa, JP;
Mitsunori Matsuo, Kanagawa, JP;
Tsutomu Ishida, Kanagawa, JP;
Keizaburo Yamaguchi, Chiba, JP;
Akihiro Yamaguchi, Kanagawa, JP;
Mitsui Toatsu Chemicals, Incorporated, Tokyo, JP;
Abstract
A polyimide comprising a requisite structural unit having one or more recurring structural units of the formula: ##STR1## such as the structural units of the formula ##STR2## The polyimide can have an extremely low dielectric constant and is colorless, transparent and excellent in processability and heat resistance, and also provides an aromatic diamine which is useful as a raw material monomer of the polyimide or a raw material of other various engineering plastics.