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:
Sep. 30, 2003
Filed:
Sep. 15, 2000
Makoto Inoue, Miyagi, JP;
Akiko Watanabe, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention provides a magnetic recording medium comprising a non-magnetic support body coated with a lower undercoat layer formed from a non-magnetic paint prepared by kneading at least a binder and a non-magnetic powder and an upper magnetic layer formed on the lower undercoat layer, from a magnetic paint prepared by kneading at least a binder and a magnetic powder, wherein the non-magnetic powder includes a non-magnetic pigment whose surface has an area coated with graphite-shaped crystal of carbon black. The lower undercoat layer arranged under the magnetic layer has a preferable surface characteristic and an excellent electric conductivity, and the magnetic layer formed as a thin film has a preferable electromagnetic conversion characteristic.