Patents by Inventor Masafumi NAKAYA

Masafumi NAKAYA has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method of producing magnetic powder and method of producing magnetic recording medium
    Patent number: 11830533
    Abstract: [Solving Means] A method of producing a magnetic powder includes: coating a surface of each of silica-coated precursor particles with at least one type of coating agent of a metal chloride or a sulfate; and firing the precursor particles coated with the coating agent.
    Type: Grant
    Filed: March 27, 2019
    Date of Patent: November 28, 2023
    Assignee: Sony Corporation
    Inventors: Natsuki Toyosawa, Norikatsu Fujisawa, Yuta Akimoto, Satoru Abe, Masaru Terakawa, Katsunori Maeshima, Atsushi Muramatu, Masafumi Nakaya
  • CUBIC CRYSTAL ALKALI METAL MANGANATE NANOPARTICLE PRODUCTION METHOD AND CUBIC CRYSTAL LIMNO2 NANOPARTICLES PRODUCED USING SAME
    Publication number: 20230257281
    Abstract: A LiMnO2 production method includes generating cubic crystal LiMnO2 nanoparticles by adding an organic solvent, manganese oxide nanoparticles, and lithium amide in a reaction vessel and heating in an inert atmosphere. and a washing and recovering the generated particles. Wurtzite type MnO nanoparticles are preferably used as the manganese oxide. As a result, LiMnO2 nanoparticles that have a substantially similar particle size to wurtzite type MnO nanoparticles can be obtained from an Mn raw material. Nanoparticles having a hollow structure can be obtained by controlling the reaction temperature.
    Type: Application
    Filed: August 3, 2021
    Publication date: August 17, 2023
    Applicants: STANLEY ELECTRIC CO., LTD., TOHOKU UNIVERSITY
    Inventors: Masafumi NAKAYA, Takuya KAZAMA, Wataru TAMURA, Yasuyuki MIYAKE, Atsushi MURAMATSU, Kiyoshi KANIE
  • Method of producing a magnetic powder and method of producing a magnetic recording medium
    Patent number: 11521649
    Abstract: A method of producing a magnetic powder includes: performing heat treatment on first particles that contain triiron tetraoxide to prepare second particles that contain ?-iron oxide.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: December 6, 2022
    Assignee: Sony Corporation
    Inventors: Atsushi Muramatsu, Masafumi Nakaya, Masaru Terakawa, Satoru Abe, Natsuki Toyosawa, Katsunori Maeshima
  • Magnetic powder, method of producing the same, and magnetic recording medium
    Patent number: 11170813
    Abstract: A method of producing a magnetic powder includes performing heat treatment on first particles that contain ferrous oxide to prepare 5 second particles that contain ?-iron oxide.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: November 9, 2021
    Assignee: Sony Corporation
    Inventors: Atsushi Muramatsu, Masafumi Nakaya, Masaru Terakawa, Katsunori Maeshima, Minoru Yamaga
  • METHOD OF PRODUCING A MAGNETIC POWDER AND METHOD OF PRODUCING A MAGNETIC RECORDING MEDIUM
    Publication number: 20210287714
    Abstract: A method of producing a magnetic powder includes: performing heat treatment on first particles that contain triiron tetraoxide to prepare second particles that contain ?-iron oxide.
    Type: Application
    Filed: September 27, 2017
    Publication date: September 16, 2021
    Inventors: Atsushi MURAMATSU, Masafumi NAKAYA, Masaru TERAKAWA, Satoru ABE, Natsuki TOYOSAWA, Katsunori MAESHIMA
  • MAGNETIC POWDER, METHOD OF PRODUCING THE SAME, AND MAGNETIC RECORDING MEDIUM
    Publication number: 20190228800
    Abstract: A method of producing a magnetic powder includes performing heat treatment on first particles that contain ferrous oxide to prepare second particles that contain ?-iron oxide.
    Type: Application
    Filed: September 27, 2017
    Publication date: July 25, 2019
    Inventors: Atsushi MURAMATSU, Masafumi NAKAYA, Masaru TERAKAWA, Katsunori MAESHIMA, Minoru YAMAGA