Patents by Inventor Natsuki TOYOSAWA

Natsuki TOYOSAWA 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
  • 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
  • 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
  • METHOD OF PRODUCING MAGNETIC POWDER AND METHOD OF PRODUCING MAGNETIC RECORDING MEDIUM
    Publication number: 20210027807
    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: Application
    Filed: March 27, 2019
    Publication date: January 28, 2021
    Inventors: Natsuki TOYOSAWA, Norikatsu FUJISAWA, Yuta AKIMOTO, Satoru ABE, Masaru TERAKAWA, Katsunori MAESHIMA, Atsushi MURAMATU, Masashi NAKATANI