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. 25, 1995
Filed:
Mar. 26, 1993
Takeshi Kakuta, Kanagawa, JP;
Shinji Saito, Kanagawa, JP;
Kazuo Kato, Kanagawa, JP;
Noburo Hibino, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium and a magnetic tape cassette are disclosed, comprising a non-magnetic support having formed on one surface only thereof at least two layers including a lower layer and an upper magnetic layer formed thereon, wherein the surface electric resistance (Rs) of the surface of the magnetic layer of said magnetic recording medium is 10.sup.9 .OMEGA./sq or less, the non-magnetic support contains at least three different kinds of particles which vary from each other in at least one property of mean particle diameter and Mohs' hardness, and the opposite surface of the magnetic recording medium comprises the rear surface of the nonmagnetic support having at least 1,000 projections having a height of from 200 nm to 400 nm per 0.1 mm.sup.2, but with the provisos that not more than 1,000 projections are present having a height of from 400 nm to 700 nm per 0.1 mm.sup.2 and not more than 50 projections are present having a height of 700 nm or more per 0.1 mm.sup.2.