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:
Jan. 03, 1995
Filed:
Aug. 20, 1993
Harald Jachow, Worms, DE;
Ekkehard Schwab, Neustadt, DE;
Reinhard Koerner, Frankenthal, DE;
Norbert Mueller, Friedelsheim, DE;
Rudi Lehnert, Ludwigshafen, DE;
Manfred Ohlinger, Frankenthal, DE;
Helmut Auweter, Limburgerhof, DE;
Helmut Jakusch, Frankenthal, DE;
Ronald J Veitch, Maxdorf, DE;
Michael Bobrich, Boehl-Iggelheim, DE;
BASF Magnetics GmbH, Mannheim, DE;
Abstract
A magnetic recording medium comprising a nonmagnetic substrate and at least one magnetic layer applied thereon and containing an acicular chromium dioxide uniformly distributed in a polymeric binder and additives and having a coercive force of at least 60 kA/m, a mean particle length of the chromium dioxide of less than 300 nm, whose factor HD according to the formula ##EQU1## where KT is the coercive force of the magnetic layer in [kA/m], measured in an external field of 380 kA/m, L is the mean particle length and .DELTA.L is the range of the particle size distribution, determined from the numerical distribution of the particle length, both measured in [nm], is greater than 1.85, and a process for the preparation of this chromium dioxide.