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Hitachi Maxell Assigned Patent

Tape magnetic recording medium

Hitachi Maxell, Ltd., Ibaraki-Shi, Osaka, Japan, has been assigned a patent (9,311,946) developed by Tanaka, Kenji, Fujita, Masao, and Kuse, Sadamu, Osaka, Japan, for a “magnetic recording medium.

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate, a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant, and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10nm and 35nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA, (Tape Spacing Analyzer,) the value of the spacing after washing is 3 to 10nm, and the value of the spacing before washing is 1 to 5nm smaller than the value of the spacing after washing.

The patent application was filed on August 16, 2011 (13/211,051).

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