Sony Group Assigned Patent

Sony Group Corporation, Tokyo, Japan, has been assigned a patent (11527260) developed by Yamaga, Minoru, Iwama, Takanobu, and Takahashi, Jun, Miyagi, Japan, for “magnetic recording medium, magnetic recording/reproducing device, and magnetic recording medium cartridge.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, a magnetic layer disposed on the base layer, and a back layer disposed on a side of the substrate opposite to the base layer. A surface of the back layer opposite to the substrate has a kurtosis of 2.0 or more. On a surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 10 or more and 200 or less per 1600 μm.sup.2. A surface of the magnetic layer has arithmetic average roughness Ra of 2.5 nm or less. The entire magnetic recording medium has a BET specific surface area of 3.5 m.sup.2/g or more in a where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.”

The patent application was filed on 2019-10-01 (16/651811).