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. 18, 1995
Filed:
Sep. 29, 1993
Yoshiki Goto, Kitakatsuragi, JP;
Yukihiro Shimasaki, Sanda, JP;
Kazuyoshi Honda, Takatsuki, JP;
Tatsuaki Ishida, Sakai, JP;
Kiyokazu Tohma, Hirakata, JP;
Ryuji Sugita, Hirakata, JP;
Yasuhiro Kawawake, Suita, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
In a magnetic recording medium with a back coat layer including polyurethane having a Tg (glass-transition temperature) below room temperature, isocyanate hardener, carbon powder and inorganic abrasive pigment are formed on a face of a non-magnetic substrate opposite a face covered by a magnetic recording film. Using this back coat layer, improved post contact characteristics and the like are obtained and smooth running conditions under small tensions are realized. Further, the magnetic recording medium causes only a small amount of head wear, and the medium has improved wear resistance.