US Patent No. 9,713,581 B2; MTG Co., Ltd. of Japan has been awarded a US patent for a magnetic powder comprised of ferromagnetic ferrite, a content of particles with a particle diameter of less than 37 μm of 15% by mass or less; a content of particles with a particle diameter of 105 μm or more of 5% by mass or less; a saturation magnetization of 80 Am2/kg or more; a transmittance of 90% or more at a wavelength of 474 nm of a supernatant liquid obtained by dispersing the magnetic powder in methan...