Toyo Kohan Assigned Patent

Toyo Kohan Co., Ltd., Tokyo, Japan, has been assigned a patent (11,205,453) developed by Takimoto, Ayaka, and Mukai, Nobuaki, Kudamatsu, Japan, for “hard disk substrate and hard disk device including the hard disk substrate.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided are a thin hard disk substrate that is scratch-resistant on the disk surface and wobbles less during rotation and a hard disk device including such a hard disk substrate. The hard disk substrate 1 includes an aluminum alloy substrate 2 having NiP plating films 3 on the surfaces. The aluminum alloy substrate 2 has the Vickers hardness of 60 Hv or more, the ratio between the thickness of the NiP plating films 3 and the thickness of the Al alloy substrate 2 is 3.8% or more, the Young’s modulus of the hard disk substrate 1 is 74.6 GPa or more, and the Vickers hardness of the hard disk substrate 1 is 293 Hv or more.”

The patent application was filed on December 28, 2017 (16/473,662).