Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Theftproof tag
 A theftproof tag which is effective regardless of the material of the article to which it is attached. There is neither a change in resonance of a resonance circuit nor a decrease in the Q value due to the material of the surface of a theft monitored article, thereby decreasing errors in the operation of a theft monitor. The theftproof tag has a resonance circuit resonating to an electric wave at a specified frequency transmitted from a transmitting antenna, and having a coil unit and a capacitor electrically connected to both ends of the coil unit. The coil unit has a magnetic core member made of a composite material composed of a powder or flakes of a soft magnetic metal, and a plastic, and a winding wound around the periphery of the magnetic core member and connected to the capacitor, a portion of the magnetic core member facing the attaching surface of the article. 
Mitsubishi Materials Corporation
G G H G G
G08B G08B H01F G08B G08B
inventional inventional inventional inventional inventional
Tomohiro Seiro Takanori Takashi Masami
Mori Yahata Endo Tsuchida Miyake