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:
Jul. 22, 2003
Filed:
Aug. 28, 2001
Tomohiko Yamamoto, Yamaguchi, JP;
Katsumi Kato, Yamaguchi, JP;
Toshinori Hosoma, Yamaguchi, JP;
Shuichi Hashiguchi, Tokyo, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
A polyimide film favorably employable in a method of producing a through-hole in an aromatic-polyimide film having on its surface a laminated or deposited metal film by applying laser beam onto the polyimide film, preferably is composed of a high Tg aromatic polyimide layer which has a Tg of 300° C. or higher or has no noticeable Tg and is produced from a biphenyltetracarboxylic acid compound and an aromatic diamine compound and a low Tg aromatic polyimide layer which has a Tg of lower than 375° C. but higher than 200° C., provided that the Tg of the low Tg polyimide layer is lower than the Tg of the high Tg polyimide layer and the metal film is laminated or deposited on the surface of the low Tg polyimide layer on the side not facing the high Tg polyimide layer.