公开(公告)号：US20220308127A1

公开(公告)日：2022-09-29

申请号：US17691504

申请日：2022-03-10

Applicant: SHOWA DENKO K.K.

Inventor： Isao Kabe ,  Hiroyuki Tomita

IPC: G01R33/06 ,  G01R33/00

Abstract: A magnetic sensor 10 includes: a non-magnetic substrate 11; a sensitive circuit 12 provided on a surface of the substrate 11 and including a sensitive part 121 sensing a magnetic field by a magnetic impedance effect; a terminal part 13a and a terminal part 13b connected to respective both end portions of the sensitive circuit 12; and a conductive returning member with one end portion being connected to the terminal part 13a, the returning member returning back toward the terminal part 13b.

公开(公告)号：US11292979B2

公开(公告)日：2022-04-05

申请号：US15999837

申请日：2017-02-20

Applicant: SHOWA DENKO K.K.

Inventor： Yuta Yamaguchi ,  Naoya Fukumoto ,  Naoko Ito ,  Hiroyuki Tomita ,  Ichiro Ota ,  Katsumi Murofushi

IPC: C10M105/54 ,  C07C43/13 ,  G11B5/725 ,  C10N40/18

Abstract: A fluorine-containing ether compound represented by a formula (1) shown below. R4—CH2—R3—CH2—R2—CH2—R1—CH2—R2—CH2—R3—CH2—R5  (1) In formula (1), R1 and R3 represent the same or different perfluoropolyether chains, R2 represents a linking group containing at least one polar group, one or both of R4 and R5 represent a terminal group containing two or more polar groups, and R4 and R5 are different.

公开(公告)号：US11514945B2

公开(公告)日：2022-11-29

申请号：US16489919

申请日：2018-02-20

Applicant: SHOWA DENKO K.K.

Inventor： Hiroyuki Tomita ,  Hiroko Hattori ,  Naoya Fukumoto ,  Ryuuta Miyasaka ,  Naoko Ito ,  Ichiro Ota ,  Katsumi Murofushi

IPC: G11B5/84 ,  G11B5/72 ,  C08G65/332 ,  C08G65/333 ,  C10M107/38 ,  G11B5/725

Abstract: A lubricant for a magnetic recording medium capable of forming a lubricant layer having excellent adhesion to a protective layer is provided. A lubricant for a magnetic recording medium contains a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one or both terminals of a perfluoroalkyl polyether chain. It is preferable that the group having the ethylenic carbon-carbon double bond is disposed at one terminal of the perfluoroalkyl polyether chain, and a hydroxyl group is disposed at other terminal. It is preferable that the lubricant for a magnetic recording medium contains a compound in which one or more functional groups selected from a hydroxyl group, an amino group, an amido group and a carboxyl group is disposed at one or both terminals of a perfluoroalkyl polyether chain.

公开(公告)号：US11011200B2

公开(公告)日：2021-05-18

申请号：US15640729

申请日：2017-07-03

Applicant: SHOWA DENKO K.K.

Inventor： Shoko Uetake ,  Naoya Fukumoto ,  Daisuke Yagyu ,  Yuta Yamaguchi ,  Naoko Ito ,  Hiroyuki Tomita ,  Ryuta Miyasaka ,  Katsumi Murofushi

IPC: G11B5/725 ,  C10M107/38 ,  C07C43/13 ,  C07C43/23 ,  C10M105/54 ,  C10N30/06 ,  C10N40/18 ,  C10N50/00 ,  C07D303/28

Abstract: This fluorine-containing ether compound is represented by Formula (1). R1—R2—CH2—R3—CH2—R4—R5  (1) (in Formula (1), R1 is an aryl group or an aralkyl group, R2 is a divalent linking group having 0 or 1 polar group, R3 is a perfluoropolyether chain, R4 is a divalent linking group having 2 or 3 polar groups, and R5 is an aryl group or an aralkyl group.)