公开(公告)号：US11869545B2

公开(公告)日：2024-01-09

申请号：US18166156

申请日：2023-02-08

Applicant: FUJIFILM Corporation

Inventor： Takashi Imai ,  Kazutoshi Katayama

IPC: G11B33/14

CPC classification number: G11B33/144

Abstract: A magnetic tape management device includes a processor. The processor acquires a temperature and humidity of an environment in which a magnetic tape is stored, derives a specific enthalpy using the temperature and the humidity, and performs management processing on the magnetic tape in accordance with the specific enthalpy.

公开(公告)号：US11670334B2

公开(公告)日：2023-06-06

申请号：US17394567

申请日：2021-08-05

Applicant: FUJIFILM Corporation

Inventor： Wataru Kikuchi ,  Masatoshi Yumoto ,  Takashi Imai

IPC: G11B5/706 ,  G11B5/702 ,  G11B5/714 ,  G11B5/70

CPC classification number: G11B5/70678 ,  G11B5/7013 ,  G11B5/7023 ,  G11B5/7028 ,  G11B5/714

Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer further includes a compound including a polyalkyleneimine chain and a vinyl polymer chain. The composition for a magnetic recording medium includes: ferromagnetic powder; and a compound including a polyalkyleneimine chain and a vinyl polymer chain.

公开(公告)号：US20200227080A1

公开(公告)日：2020-07-16

申请号：US16829229

申请日：2020-03-25

Applicant: FUJIFILM Corporation

Inventor： Wataru KIKUCHI ,  Masatoshi Yumoto ,  Takashi Imai

IPC: G11B5/702 ,  G11B5/706 ,  G11B5/714 ,  G11B5/735 ,  G11B5/712

Abstract: The curing agent for a magnetic recording medium includes a compound represented by General Formula 1. In General Formula 1, X represents a monovalent heterocyclic group or a monovalent group represented by General Formula 2, Z represents an m-valent organic group, and m represents an integer of 2 or more. In General Formula 2, R1 represents an alkyl group, R2 represents a hydrogen atom, an alkyl group, or an aryl group, and * represents a bonding site with an adjacent carbon atom.

公开(公告)号：US11138998B2

公开(公告)日：2021-10-05

申请号：US16360758

申请日：2019-03-21

Applicant: FUJIFILM Corporation

Inventor： Wataru Kikuchi ,  Masatoshi Yumoto ,  Takashi Imai

IPC: G11B5/70 ,  G11B5/706 ,  G11B5/702 ,  G11B5/714

Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer further includes a compound including a polyalkyleneimine chain and a vinyl polymer chain. The composition for a magnetic recording medium includes: ferromagnetic powder; and a compound including a polyalkyleneimine chain and a vinyl polymer chain.