Sony Group Assigned Patent

Sony Group Corporation, Tokyo, Japan, has been assigned a patent (11495258) developed by Yamaga, Minoru, Miyagi, Japan, for a “magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The present technology provides a tape-shaped magnetic recording medium including: a magnetic layer, an underlayer, a base layer, and a back layer, in which the number of recesses having a depth of 20% or more of the thickness of the magnetic layer is 10 or more and 200 or less per surface area of 1600 μm.sup.2, the base layer includes a polyester as a main component, a surface on a side of the back layer has a kurtosis of 2.0 or more and 4.4 or less, the magnetic recording medium has an average thickness t.sub.T of 5.6 μm or less, the magnetic recording medium includes a lubricant, the magnetic recording medium has pores, and the pores have an average diameter of 6 nm or more and 11 nm or less when the diameters of the pores are measured 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 2019-10-03 (16/649393).