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:
Jun. 04, 2002
Filed:
Jun. 21, 2001
Hidenori Yasukawa, Osaka, JP;
Hiroyuki Sakamoto, Osaka, JP;
Toshinori Takano, Osaka, JP;
Tadashi Kubota, Osaka, JP;
Hiroshi Tada, Osaka, JP;
Masami Yoshimoto, Osaka, JP;
Toyo Aluminium Kabushiki Kaisha, Osaka, JP;
Abstract
An antenna coil for an IC card includes a base material of a resin film having the thickness of at least 15 &mgr;m and at most 70 &mgr;m, and a circuit pattern layer formed on a surface of the base material, having the thickness of at least 7 &mgr;m and at most 60 &mgr;m formed of an aluminum foil containing aluminum by at least 97.5 mass % and at most 99.7 mass %. On the surface of the resin film base material, an aluminum foil containing aluminum is fixed by using a polyurethane based adhesive layer containing an epoxy resin, a resist ink layer having a prescribed pattern is printed on the foil, the foil is etched using the resist ink layer as a mask to form a circuit pattern layer, and the resist ink layer is removed.