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:
Dec. 24, 1996
Filed:
Aug. 04, 1993
Kazuyuki Hayashi, Hiroshima, JP;
Keisuke Iwasaki, Hiroshima, JP;
Yasuyuki Tanaka, Hiroshima, JP;
Minoru Ohsugi, Hiroshima, JP;
Toshiharu Harada, Hiroshima, JP;
Masaru Isoai, Hiroshima, JP;
Kazushi Takama, Hiroshima, JP;
Toda Kogyo Corporation, , JP;
Abstract
Disclosed herein are non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium, comprising acicular or spindle-shaped .alpha.-Fe.sub.2 O.sub.3 particles coated with at least one selected from the group consisting of an A1 compound, a silane coupling agent, a titanate coupling agent, an aluminate coupling agent and a zirconate coupling agent; a non-magnetic undercoating layer containing such non-magnetic particles; and magnetic recording medium having such an undercoating layer.