Patents by Inventor Shinji Tsujimoto

Shinji Tsujimoto 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).

  • Publication number: 20220148776
    Abstract: The magnetic tape includes a non-magnetic support, a magnetic layer that includes ferromagnetic powder having an average particle volume of 2,500 nm3 or less on one surface side of the non-magnetic support, and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal ferrite powder and ?-iron oxide powder, and a ratio (PSD5?m-PSDmag/PSD10?m-PSDbc) of the magnetic layer and the back coating layer is in a range of 0.0050 to 0.20. A magnetic tape cartridge and a magnetic recording and reproducing apparatus include the magnetic tape.
    Type: Application
    Filed: January 24, 2022
    Publication date: May 12, 2022
    Applicant: FUJIFILM Corporation
    Inventor: Shinji Tsujimoto
  • Patent number: 11270822
    Abstract: The magnetic tape includes a non-magnetic support, a magnetic layer that includes ferromagnetic powder having an average particle volume of 2,500 nm3 or less on one surface side of the non-magnetic support, and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal ferrite powder and ?-iron oxide powder, and a ratio (PSD5 ?m-PSDmag/PSD10 ?m-PSDbc) of the magnetic layer and the back coating layer is in a range of 0.0050 to 0.20. A magnetic tape cartridge and a magnetic recording and reproducing apparatus include the magnetic tape.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: March 8, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Shinji Tsujimoto
  • Patent number: 11056142
    Abstract: The magnetic recording medium includes a non-magnetic substrate, a non-magnetic layer, and a magnetic layer, wherein the magnetic layer contains a hexagonal strontium ferrite magnetic powder, Mr and t satisfy 0.0020 ?T·m?Mr·t?0.0150 ?T·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, L1 satisfies 2 nm?L1?6 nm, where L1 is the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, L2 satisfies 0.1?L2/t?0.45, where L2 is the average thickness of a second mixed layer that is formed on the surface of the magnetic layer facing the non-magnetic layer.
    Type: Grant
    Filed: April 29, 2019
    Date of Patent: July 6, 2021
    Assignee: FUJIFILM Corporation
    Inventors: Shinji Kawakami, Sadamu Kuse, Kenji Tanaka, Shinji Tsujimoto
  • Publication number: 20200279679
    Abstract: The magnetic tape includes a non-magnetic support, a magnetic layer that includes ferromagnetic powder having an average particle volume of 2,500 nm3 or less on one surface side of the non-magnetic support, and a back coating layer that includes non-magnetic powder on the other surface side of the non-magnetic support, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal ferrite powder and ?-iron oxide powder, and a ratio (PSD5 ?m-PSDmag/PSD10 ?m-PSDbc) of the magnetic layer and the back coating layer is in a range of 0.0050 to 0.20. A magnetic tape cartridge and a magnetic recording and reproducing apparatus include the magnetic tape.
    Type: Application
    Filed: February 27, 2020
    Publication date: September 3, 2020
    Applicant: FUJIFILM Corporation
    Inventor: Shinji TSUJIMOTO
  • Patent number: 10586565
    Abstract: The magnetic recording medium contains, in a magnetic layer, a fatty acid ester and a polyester resin having a number average molecular weight of greater than or equal to 1,000 but less than 20,000, and containing a structural unit derived from a polyvalent carboxylic acid and a structural unit derived from a polyol, as well as 10 mol % to 50 mol % of a structural unit, derived from a cyclic polyvalent carboxylic acid selected from the group consisting of an alicyclic polyvalent carboxylic acid and an aromatic polyvalent carboxylic acid, per 100 mol % of a combined total of the above structural units, and one or more partial structures selected from the group consisting of the following partial structures: wherein each of L1 and L2 independently denotes a divalent connecting group, and each of Z1 and Z2 independently denotes a monovalent group denoted by —OM or a monovalent group denoted by —O?A+.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: March 10, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Toshihide Aoshima, Mika Imamura, Shinji Tsujimoto
  • Publication number: 20190259416
    Abstract: The magnetic recording medium includes a non-magnetic substrate, a non-magnetic layer, and a magnetic layer, wherein the magnetic layer contains a hexagonal strontium ferrite magnetic powder, Mr and t satisfy 0.0020 ?T·m?Mr·t?0.0150 ?T·m, where Mr is the residual magnetic flux density of the magnetic layer, and t is the average thickness of the magnetic layer, L1 satisfies 2 nm?L1?6 nm, where L1 is the average thickness of a first mixed layer that is formed on the surface of the magnetic layer opposite to the non-magnetic layer, L2 satisfies 0.1?L2/t?0.45, where L2 is the average thickness of a second mixed layer that is formed on the surface of the magnetic layer facing the non-magnetic layer.
    Type: Application
    Filed: April 29, 2019
    Publication date: August 22, 2019
    Applicant: FUJIFILM Corporation
    Inventors: Shinji KAWAKAMI, Sadamu KUSE, Kenji TANAKA, Shinji TSUJIMOTO
  • Publication number: 20170287518
    Abstract: The magnetic recording medium contains, in a magnetic layer, a fatty acid ester and a polyester resin having a number average molecular weight of greater than or equal to 1,000 but less than 20,000, and containing a structural unit derived from a polyvalent carboxylic acid and a structural unit derived from a polyol, as well as 10 mol % to 50 mol % of a structural unit, derived from a cyclic polyvalent carboxylic acid selected from the group consisting of an alicyclic polyvalent carboxylic acid and an aromatic polyvalent carboxylic acid, per 100 mol % of a combined total of the above structural units, and one or more partial structures selected from the group consisting of the following partial structures: wherein each of L1 and L2 independently denotes a divalent connecting group, and each of Z1 and Z2 independently denotes a monovalent group denoted by —OM or a monovalent group denoted by —O?A+.
    Type: Application
    Filed: March 30, 2017
    Publication date: October 5, 2017
    Applicant: FUJIFILM Corporation
    Inventors: Toshihide AOSHIMA, Mika IMAMURA, Shinji TSUJIMOTO
  • Patent number: 8795858
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: August 5, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Masahide Sato, Katsumi Araki, Kazufumi Omura, Tomohiro Ichikawa, Shinji Tsujimoto, Tadahiro Ooishi
  • Patent number: 8617728
    Abstract: An aspect of the present invention relates to a magnetic tape comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition. The nonmagnetic layer has a thickness ranging from 0.5 to 1.3 ?m. The relation between the nonmagnetic powder and the binder component contained in the radiation-curable composition satisfies equation (I): 480?(BET specific surface area of the nonmagnetic powder (m2/g)×weight of the nonmagnetic powder (g))/weight of the binder component (g)?650??(I).
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: December 31, 2013
    Assignee: FUJIFILM Corporation
    Inventors: Shinji Tsujimoto, Katsumi Araki, Tomohiro Ichikawa
  • Patent number: 8409594
    Abstract: The present invention aims to provide solid compositions comprising an oil-in-water emulsion that have sufficient hardness and good feel when used, and can sufficiently exhibit the physiological functions of an electrolyte. A solid composition is obtained by preparing an oil-in-water emulsion by combining a solid oil (A), a liquid oil (B), a surfactant (C), a polyhydric alcohol (D), an electrolyte (E), and water (F).
    Type: Grant
    Filed: December 27, 2005
    Date of Patent: April 2, 2013
    Assignee: Otsuka Pharmaceutical Co., Ltd.
    Inventors: Shigeo Shinohara, Fumiki Harano, Shinji Tsujimoto, Isamu Saeki
  • Publication number: 20110229740
    Abstract: An aspect of the present invention relates to a magnetic tape comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition. The nonmagnetic layer has a thickness ranging from 0.5 to 1.3 ?m. The relation between the nonmagnetic powder and the binder component contained in the radiation-curable composition satisfies equation (I): 480?(BET specific surface area of the nonmagnetic powder (m2/g)×weight of the nonmagnetic powder (g))/weight of the binder component (g)?650??(I).
    Type: Application
    Filed: March 15, 2011
    Publication date: September 22, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Shinji TSUJIMOTO, Katsumi ARAKI, Tomohiro ICHIKAWA
  • Publication number: 20110229741
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 22, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Masahide SATO, Katsumi ARAKI, Kazufumi OMURA, Tomohiro ICHIKAWA, Shinji TSUJIMOTO, Tadahiro OOISHI
  • Publication number: 20070280979
    Abstract: The present invention aims to provide solid compositions comprising an oil-in-water emulsion that have sufficient hardness and good feel when used, and can sufficiently exhibit the physiological functions of an electrolyte. A solid composition is obtained by preparing an oil-in-water emulsion by combining a solid oil (A), a liquid oil (B), a surfactant (C), a polyhydric alcohol (D), an electrolyte (E), and water (F).
    Type: Application
    Filed: December 12, 2005
    Publication date: December 6, 2007
    Inventors: Shigeo Shinohara, Fumiki Harano, Shinji Tsujimoto, Isamu Saeki
  • Patent number: 7283320
    Abstract: A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recorded. The servo signal is magnetized and recorded on the servo band, having been magnetized in one direction of the track direction thereof, in the direction other than the one direction. The thickness of the magnetic layer ranging from 10 to 180 ?m, and variation [standard deviation of Mrt] of the product [Mrt] of the residual magnetism by the thickness of the magnetic field being not more than 30%.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: October 16, 2007
    Assignee: Fujifilm Corporation
    Inventors: Shinji Tsujimoto, Kiyomi Ejiri
  • Publication number: 20070231615
    Abstract: A magnetic recording medium including: a back coat layer; a nonmagnetic support; and coated layers including: a nonmagnetic layer containing nonmagnetic powder and a binder; and a magnetic layer containing ferromagnetic powder and a binder, so that the back coat layer, the nonmagnetic support, the nonmagnetic layer and the magnetic layer are provided in this order, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an average tabular size of less than 30 nm, and a central plane surface roughness Ra of the magnetic layer, a central plane surface roughness Ra of the back coat layer, a glass transition point of the coated layers, a glass transition point of the back coat layer and a ratio of a Young's modulus of the magnetic layer to a Young's modulus of the back coat layer are defined herein.
    Type: Application
    Filed: April 2, 2007
    Publication date: October 4, 2007
    Applicant: FUJIFILM Corporation
    Inventors: Shinji Tsujimoto, Takeshi Harasawa
  • Patent number: 7203031
    Abstract: A substrate for a thin-film magnetic head includes a ceramic base and an undercoat film of amorphous SiC, which is supported on the ceramic base.
    Type: Grant
    Filed: December 16, 2002
    Date of Patent: April 10, 2007
    Assignee: Neomax Co., Ltd.
    Inventors: Hironobu Tsubota, Shinji Tsujimoto, Taisuke Hirooka
  • Publication number: 20060063041
    Abstract: A magnetic recording medium is provided that includes a support, and at least one magnetic layer provided above the support, the magnetic layer including a ferromagnetic powder dispersed in a binder, the binder of the magnetic layer including a binder that is obtained by a reaction between a hyperbranched polyester and an isocyanate curing agent, and the magnetic layer having an indentation hardness of 392 to 981 MPa (40 to 100 kgf/mm2).
    Type: Application
    Filed: September 22, 2005
    Publication date: March 23, 2006
    Inventors: Shinji Tsujimoto, Hiroshi Hashimoto
  • Publication number: 20040265644
    Abstract: A magnetic recording medium having a magnetic layer containing magnetic powder provided on a support is disclosed. The magnetic layer possesses a servo band in which a servo signal for controlling tracking of a magnetic head, and a data band on which a data is recorded. The servo signal is magnetized and recorded on the servo band, having been magnetized in one direction of the track direction thereof, in the direction other than the one direction. The thickness of the magnetic layer ranging from 10 to 180 &mgr;m, and variation [standard deviation of Mrt] of the product [Mrt] of the residual magnetism by the thickness of the magnetic field being not more than 30%.
    Type: Application
    Filed: June 29, 2004
    Publication date: December 30, 2004
    Applicant: FUJI PHOTO FILM CO., LTD.
    Inventors: Shinji Tsujimoto, Kiyomi Ejiri
  • Publication number: 20040037003
    Abstract: A substrate for a thin-film magnetic head includes a ceramic base and an undercoat film of amorphous SiC, which is supported on the ceramic base.
    Type: Application
    Filed: June 3, 2003
    Publication date: February 26, 2004
    Inventors: Hironobu Tsubota, Shinji Tsujimoto, Taisuke Hirooka
  • Patent number: 6532132
    Abstract: A marking method for a sintered product of the invention includes forming a concave portion on the sintered product by irradiating the sintered product with laser light thereby to write identification information on the sintered product. The depth of the concave portion is adjusted in a range between 0.1 &mgr;m and 5 &mgr;m, inclusive.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: March 11, 2003
    Assignee: Sumitomo Special Metals Co., Ltd.
    Inventors: Shinji Tsujimoto, Takayuki Morikawa