Patents by Inventor Noriko OYANAGI

Noriko OYANAGI 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).

  • Patent number: 12057152
    Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. An anisotropic magnetic field Hk is 12 kOe or more, a center line average roughness Ra of the surface of the magnetic recording medium on the magnetic layer side is 1.2 nm or less, and a ratio ?r of a contact angle ?2 with respect to 1-bromonaphthalene, measured on a surface on the magnetic layer side after a 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion, to a contact angle ?1 with respect to 1-bromonaphthalene, measured on the surface on the magnetic layer side before the 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion is 0.95 or less.
    Type: Grant
    Filed: February 26, 2021
    Date of Patent: August 6, 2024
    Assignee: FUJIFILM Corporation
    Inventors: Noriko Oyanagi, Wataru Kikuchi
  • Patent number: 12051448
    Abstract: Provided are a magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including the magnetic tape. The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder. An amount of a fluid lubricant extracted from a surface of the magnetic layer after sliding on a magnetic head in an environment of a temperature of 60° C.±1° C. and a relative humidity of 10% is 50% or more of an amount of the fluid lubricant extracted from the surface of the magnetic layer before the sliding, on a mass basis.
    Type: Grant
    Filed: July 18, 2023
    Date of Patent: July 30, 2024
    Assignee: FUJIFILM Corporation
    Inventor: Noriko Oyanagi
  • Patent number: 11869559
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A fluorine-containing compound is included in a portion on the non-magnetic support on a magnetic layer side, and a ratio ?r of a water contact angle measured on a surface of the magnetic layer after sliding on a magnetic head to a water contact angle measured on the surface of the magnetic layer before sliding on the magnetic head is 0.70 or more.
    Type: Grant
    Filed: July 26, 2022
    Date of Patent: January 9, 2024
    Assignee: FUJIFILM Corporation
    Inventors: Noriko Oyanagi, Wataru Kikuchi, Akio Tamura
  • Publication number: 20230360671
    Abstract: Provided are a magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including the magnetic tape. The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder. An amount of a fluid lubricant extracted from a surface of the magnetic layer after sliding on a magnetic head in an environment of a temperature of 60° C.±1° C. and a relative humidity of 10% is 50% or more of an amount of the fluid lubricant extracted from the surface of the magnetic layer before the sliding, on a mass basis.
    Type: Application
    Filed: July 18, 2023
    Publication date: November 9, 2023
    Applicant: FUJIFILM Corporation
    Inventor: Noriko OYANAGI
  • Publication number: 20230317110
    Abstract: Ra measured on a surface of a magnetic layer is 2.5 nm or less, and ?(HD?HB) between a protrusion height HD with a height of a peripheral base region of 0 nm as a reference, which is measured by AFM, for a region specified as a dark region in a first binarization-processed image of a reflected electron image obtained by imaging the surface of the magnetic layer with SEM and a protrusion height HB with a height of a peripheral base region of 0 nm as a reference, which is measured by AFM, for a region specified as a bright region in a second binarization-processed image of the reflected electron image obtained by imaging the surface of the magnetic layer with SEM, the second binarization processing being performed on a higher gradation side than the first binarization processing, is 0.7 nm or more.
    Type: Application
    Filed: March 28, 2023
    Publication date: October 5, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Noriko OYANAGI, Tatsuya YAMASHITA
  • Publication number: 20230154491
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the magnetic layer includes an abrasive, the abrasive is a carbide, an average primary particle diameter of the abrasive is 10 nm or more and 100 nm or less, and in an electron microscope image of a surface of the magnetic layer, assuming that a total area occupied by the abrasive is 100%, a ratio of an area occupied by the abrasive present in an aggregated state having a maximum Feret diameter of 0.2 µm or more is 50% or more.
    Type: Application
    Filed: November 3, 2022
    Publication date: May 18, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Junya SAWADA, Noriko Oyanagi
  • Publication number: 20230101868
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A fluorine-containing compound is included in a portion on the non-magnetic support on a magnetic layer side, and a ratio ?r of a water contact angle measured on a surface of the magnetic layer after sliding on a magnetic head to a water contact angle measured on the surface of the magnetic layer before sliding on the magnetic head is 0.70 or more.
    Type: Application
    Filed: July 26, 2022
    Publication date: March 30, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Noriko OYANAGI, Wataru KIKUCHI, Akio Tamura
  • Publication number: 20210280213
    Abstract: The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. An anisotropic magnetic field Hk is 12 kOe or more, a center line average roughness Ra of the surface of the magnetic recording medium on the magnetic layer side is 1.2 nm or less, and a ratio ?r of a contact angle ?2 with respect to 1-bromonaphthalene, measured on a surface on the magnetic layer side after a 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion, to a contact angle ?1 with respect to 1-bromonaphthalene, measured on the surface on the magnetic layer side before the 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion is 0.95 or less.
    Type: Application
    Filed: February 26, 2021
    Publication date: September 9, 2021
    Applicant: FUJIFILM Corporation
    Inventors: Noriko OYANAGI, Wataru KIKUCHI