Patents by Inventor Kazutoshi Katayama
Kazutoshi Katayama 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).
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Patent number: 11869545Abstract: 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.Type: GrantFiled: February 8, 2023Date of Patent: January 9, 2024Assignee: FUJIFILM CorporationInventors: Takashi Imai, Kazutoshi Katayama
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Publication number: 20230290384Abstract: 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.Type: ApplicationFiled: February 8, 2023Publication date: September 14, 2023Applicant: FUJIFILM CorporationInventors: Takashi IMAI, Kazutoshi KATAYAMA
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Publication number: 20210056991Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a change amount of a loss tangent tan ? at a measurement temperature in a range of 50° C. to 100° C. before and after heating at 70° C. for 10 hours is 0.000 or more and 0.012 or less.Type: ApplicationFiled: August 18, 2020Publication date: February 25, 2021Applicant: FUJIFILM CorporationInventors: Takashi IMAI, Kazutoshi KATAYAMA
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Patent number: 10081701Abstract: An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.Type: GrantFiled: August 29, 2014Date of Patent: September 25, 2018Assignee: FUJIFILM CorporationInventors: Toshihide Aoshima, Kazutoshi Katayama
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Patent number: 9984711Abstract: The magnetic recording medium comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, and further comprises a compound denoted by Formula (1): wherein, in Formula (1), X denotes —O—, —S—, or NR1—; each of R and R1 independently denotes a hydrogen atom or a monovalent substituent; L denotes a divalent connecting group; Z denotes a partial structure of valence n comprising at least one group selected from the group consisting of carboxyl groups and carboxylate groups; m denotes an integer of greater than or equal to 2, and n denotes an integer of greater than or equal to 1.Type: GrantFiled: September 29, 2015Date of Patent: May 29, 2018Assignee: FUJIFILM CorporationInventors: Toshihide Aoshima, Wataru Kikuchi, Kazutoshi Katayama, Tatsuo Mikami
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Publication number: 20170349691Abstract: An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.Type: ApplicationFiled: August 24, 2017Publication date: December 7, 2017Applicant: FUJIFILM CorporationInventors: Toshihide AOSHIMA, Kazutoshi KATAYAMA
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Patent number: 9761261Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the magnetic layer further comprises a compound which has a weight average molecular weight of equal to or more than 1,000 but less than 20,000 and is denoted by formula (1): wherein, in formula (1), A1 denotes a monovalent polymer group, each of R1 and R2 independently denotes a single bond or a divalent connecting group, R11 denotes a hydrogen atom or a monovalent substituent, m denotes an integer of equal to or greater than 2, multiple instances of R1, R2, A1, and R11 that are present can be identical or different, A2 denotes a hydrogen atom or a monovalent substituent denoted by —OR3—Z, R3 denotes a single bond or a divalent connecting group, Z denotes a monovalent acid group, among multiple instances of A2 that are present, at least one denotes a monovalent group denoted by —O—R3—Z, and X denotes a connecting group ofType: GrantFiled: March 30, 2015Date of Patent: September 12, 2017Assignee: FUJIFILM CorporationInventors: Toshihide Aoshima, Wataru Kikuchi, Kazutoshi Katayama, Tatsuo Mikami
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Patent number: 9562167Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the magnetic layer further comprises a compound which has a weight average molecular weight of equal to or more than 1,000 but less than 20,000 and is denoted by formula (1): wherein, in formula (1), A denotes a monovalent substituent, R1 denotes a single bond or a divalent connecting group, and m denotes an integer ranging from 2 to 4, multiple instances of A and R1 that are present can be identical or different, at least one of the multiple instances of A that are present denotes a monovalent polymer group and X denotes a heterocyclic group of valence m.Type: GrantFiled: March 30, 2015Date of Patent: February 7, 2017Assignee: FUJIFILM CorporationInventors: Wataru Kikuchi, Toshihide Aoshima, Kazutoshi Katayama, Tatsuo Mikami
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Publication number: 20160093321Abstract: The magnetic recording medium comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, and further comprises a compound denoted by Formula (1): wherein, in Formula (1), X denotes —O—, —S—, or NR1—; each of R and R1 independently denotes a hydrogen atom or a monovalent substituent; L denotes a divalent connecting group; Z denotes a partial structure of valence n comprising at least one group selected from the group consisting of carboxyl groups and carboxylate groups; m denotes an integer of greater than or equal to 2, and n denotes an integer of greater than or equal to 1.Type: ApplicationFiled: September 29, 2015Publication date: March 31, 2016Applicant: FUJIFILM CORPORATIONInventors: Toshihide AOSHIMA, Wataru KIKUCHI, Kazutoshi KATAYAMA, Tatsuo MIKAMI
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Publication number: 20160064025Abstract: The magnetic recording medium comprises a nonmagnetic layer comprising nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer comprising ferromagnetic powder and binder on the nonmagnetic layer, wherein the magnetic layer comprises a lubricant and a 1-bromonaphthalene contact angle adjusting agent that is capable of adjusting a contact angle for 1-bromonaphthalene, the contact angle for 1-bromonaphthalene being measured on a surface of the magnetic layer, and the contact angle measured on the surface of the magnetic layer ranges from 45.0° to 55.0° for 1-bromonaphthalene, and ranges from 90.0° to 100.0° for water.Type: ApplicationFiled: August 28, 2015Publication date: March 3, 2016Applicant: FUJIFILM CORPORATIONInventors: Takuto KUROKAWA, Kazutoshi KATAYAMA
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Publication number: 20150279404Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the magnetic layer further comprises a compound which has a weight average molecular weight of equal to or more than 1,000 but less than 20,000 and is denoted by formula (1): wherein, in formula (1), A1 denotes a monovalent polymer group, each of R1 and R2 independently denotes a single bond or a divalent connecting group, R11 denotes a hydrogen atom or a monovalent substituent, m denotes an integer of equal to or greater than 2, multiple instances of R1, R2, A1, and R11 that are present can be identical or different, A2 denotes a hydrogen atom or a monovalent substituent denoted by —OR3—Z, R3 denotes a single bond or a divalent connecting group, Z denotes a monovalent acid group, among multiple instances of A2 that are present, at least one denotes a monovalent group denoted by —O—R3—Z, and X denotes a connecting group ofType: ApplicationFiled: March 30, 2015Publication date: October 1, 2015Applicant: FUJIFILM CorporationInventors: Toshihide AOSHIMA, Wataru KIKUCHI, Kazutoshi KATAYAMA, Tatsuo MIKAMI
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Publication number: 20150279403Abstract: An aspect of the present invention relates to a magnetic recording medium, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the magnetic layer further comprises a compound which has a weight average molecular weight of equal to or more than 1,000 but less than 20,000 and is denoted by formula (1): wherein, in formula (1), A denotes a monovalent substituent, R1 denotes a single bond or a divalent connecting group, and m denotes an integer ranging from 2 to 4, multiple instances of A and R1 that are present can be identical or different, at least one of the multiple instances of A that are present denotes a monovalent polymer group and X denotes a heterocyclic group of valence m.Type: ApplicationFiled: March 30, 2015Publication date: October 1, 2015Applicant: FUJIFILM CORPORATIONInventors: Wataru KIKUCHI, Toshihide AOSHIMA, Kazutoshi KATAYAMA, Tatsuo MIKAMI
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Publication number: 20150064500Abstract: An aspect of the present invention relates to a composition, which is a composition for a magnetic recording medium and comprises an isocyanate compound in the form of an adduct of a polyhydroxyl compound having one or more aromatic carbon rings and three or more hydroxyl groups per molecule with a polyisocyanate having two or more isocyanate groups per molecule.Type: ApplicationFiled: August 29, 2014Publication date: March 5, 2015Applicant: FUJIFILM CorporationInventors: Toshihide AOSHIMA, Kazutoshi KATAYAMA
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Publication number: 20140374645Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein an average particle size of the ferromagnetic powder is equal to or less than 50 nm, the magnetic layer further comprises a compound, and the compound comprises at least one polyalkyleneimine chain and at least one polyester chain, with a proportion in the compound accounted for by the polyalkyleneimine chain being less than 5.0 weight percent and a number average molecular weight of the polyalkyleneimine chain ranging from 300 to 3,000.Type: ApplicationFiled: June 23, 2014Publication date: December 25, 2014Applicant: FUJIFILM CORPORATIONInventors: Wataru KIKUCHI, Toshihide AOSHIMA, Yuushi KANEKO, Kazutoshi KATAYAMA, Katsuhiko MEGURO
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Patent number: 8394481Abstract: A WORM-type recording layer in an optical information recording medium contains at least one azo-metal complex dye derived from a metal ion and a compound represented by the following general formula (1-1) or (1-2): wherein Q represents a carbocyclic group or a heterocyclic group, and R6 to R8 independently represent a hydrogen atom or a substituent. The compound represented by the general formula (1-1) or (1-2) has a dissociative hydrogen atom in Q, and the dissociative hydrogen atom in Q and the hydrogen atom in the —NH— group marked with asterisk * are eliminated from the compound, so that the residue is bonded to the metal ion to generate the azo-metal complex dye. The azo-metal complex dye may contain a component other than the metal ion and the compound represented by the general formula (1-1) or (1-2).Type: GrantFiled: September 28, 2007Date of Patent: March 12, 2013Assignee: FUJIFILM CorporationInventors: Kousuke Watanabe, Taro Hashizume, Kazutoshi Katayama
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Patent number: 8315017Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion/?m2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion/?m2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs' hardness exceeding 7.Type: GrantFiled: March 29, 2010Date of Patent: November 20, 2012Assignee: Fujifilm CorporationInventor: Kazutoshi Katayama
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Publication number: 20100246073Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion/?m2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion/?m2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs' hardness exceeding 7.Type: ApplicationFiled: March 29, 2010Publication date: September 30, 2010Applicant: FUJIFILM CorporationInventor: Kazutoshi Katayama
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Publication number: 20100074082Abstract: A WORM-type recording layer in an optical information recording medium contains at least one azo-metal complex dye derived from a metal ion and a compound represented by the following general formula (1-1) or (1-2): wherein Q represents a carbocyclic group or a heterocyclic group, and R6 to R8 independently represent a hydrogen atom or a substituent. The compound represented by the general formula (1-1) or (1-2) has a dissociative hydrogen atom in Q, and the dissociative hydrogen atom in Q and the hydrogen atom in the —NH— group marked with asterisk * are eliminated from the compound, so that the residue is bonded to the metal ion to generate the azo-metal complex dye. The azo-metal complex dye may contain a component other than the metal ion and the compound represented by the general formula (1-1) or (1-2).Type: ApplicationFiled: September 28, 2007Publication date: March 25, 2010Applicant: Fujifilm CorporationInventors: Kousuke Watanabe, Taro Hashizume, Kazutoshi Katayama
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Publication number: 20090130366Abstract: There is provided an optical information-recording medium, comprising a recording layer capable of recording of information by irradiation of a laser beam having a wavelength of 440 nm or less on or above a substrate, the recording layer comprising a dye having two or more independent dye moieties in the molecule that are bound to each other in a manner other than by forming a conjugated bond to the dye moieties, and a method of recording information, comprising recording information by irradiating a laser beam having a wavelength of 440 nm or less on or above the optical information-recording medium according to the present invention described above.Type: ApplicationFiled: June 29, 2006Publication date: May 21, 2009Applicant: Fujifilm CorporationInventors: Keita Takahashi, Tetsuya Watanabe, Kazutoshi Katayama
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Publication number: 20090052299Abstract: There is provided an optical information recording medium including, on a substrate, a recording layer in which information can be recorded by irradiating a laser beam having a wavelength of 440 nm or less, wherein the recording layer includes an oxonol dye that has a maximum absorption wavelength longer than the wavelength of the laser beam. There is also provided an information recording method including irradiating a laser beam having a wavelength of 440 nm or less to the optical information recording medium to record information.Type: ApplicationFiled: March 5, 2007Publication date: February 26, 2009Applicant: FUJIFILM CORPORATIONInventors: Tetsuya Watanabe, Keita Takahashi, Kazutoshi Katayama