Hitachi Maxell Assigned Patent

Hitachi Maxell Ltd., Ibaraki-Shi, Osaka, Japan, has been assigned a patent (9,767,835) 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 10 nm and 35 nm 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 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.“

The patent application was filed on February 26, 2016 (15/054,887).