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:
May. 25, 1999
Filed:
Mar. 25, 1996
Youichi Yoshimura, Shimofusa-machi, JP;
Shigeharu Watase, Saku, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magnetic recording medium includes a flexible substrate, a coating layer formed on the flexible substrate, and a magnetic layer formed on the coating layer. The coating layer contains a binder and nonmagnetic particles and has a thickness in the range of 0.05 to 0.7 .mu.m as a result of a stretching treatment performed at least once after application of the coating layer on the flexible substrate. The magnetic layer contains magnetic powder, a binder and an abrasive and has a thickness in the range of 0.05 to 1.0 .mu.m. The nonmagnetic particles contained in the coating layer has an average particle size in the range of 0.01 to 0.08 .mu.m. The abrasive contained in the magnetic layer has an average particle size in the range of 0.05 to 0.8 .mu.m and satisfies conditions defined by the following equations (1) and (2):