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. 19, 2005
Filed:
Apr. 09, 2001
Tadashi Fujieda, Mito, JP;
Shinzou Ikeda, Tokai, JP;
Sai Ogawa, Tokai, JP;
Teruyoshi Abe, Hitachi, JP;
Yasuhisa Aono, Hitachi, JP;
Tadashi Fujieda, Mito, JP;
Shinzou Ikeda, Tokai, JP;
Sai Ogawa, Tokai, JP;
Teruyoshi Abe, Hitachi, JP;
Yasuhisa Aono, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electromagnetic wave absorber for use in the high frequency range above 1 Ghz and a composite member are characterized by the fact that magnetic metal grains are covered with ceramic above 20 volume %. Further, a method of manufacturing the electromagnetic absorber and the composite member is characterized by the fact that composite magnetic particles, in which a plurality of magnetic metal grains and ceramic are unified, are formed through a mechanical alloying method applied to a composite powder composed of magnetic metal powder and ceramic powder. The electromagnetic wave absorber can be used in a semiconductor device, an optical sending module, an optical receiving module, an optical sending and receiving module, an automatic tollgate in which erroneous operation due to electromagnetic wave disturbance is provided by use of the electromagnetic wave absorber.