Patents by Inventor Yuuta KATSURAYAMA
Yuuta KATSURAYAMA 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: 11908629Abstract: The present invention provides an electret sheet that has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body. The electret sheet of the present invention has an air permeability of 10 to 1,000 sec/100 mL. Thus, the electret sheet has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body.Type: GrantFiled: August 23, 2019Date of Patent: February 20, 2024Assignee: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro Kato, Nobuto Kamiya, Yasuyuki Shirasaka, Yuuta Katsurayama, Ryousuke Takahashi
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Patent number: 11688563Abstract: The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5N or less) caused by a pulse wave or a breathing.Type: GrantFiled: April 29, 2021Date of Patent: June 27, 2023Assignee: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro Kato, Nobuto Kamiya, Masahiro Tsuchiya, Yuuta Katsurayama, Yasuyuki Shirasaka
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Publication number: 20230000394Abstract: A state determination method, a state determination device, a state determination system, and a recording medium are provided for determining a state of a living body based on electrical signal according to a detected vibration. A state determination device 2 acquires electrical signal according to a detected vibration, and operates: a rectification unit (step S2); an envelope detection unit to derive an envelope from the rectified electrical signal (step S3); and a state determination unit to determine the state of the living body based on the derived envelope (step S4). The state determination device 2 that has determined the state of the living body outputs a determination result (step S5).Type: ApplicationFiled: December 2, 2020Publication date: January 5, 2023Inventors: Yasuyuki SHIRASAKA, Tetsuhiro KATOU, Taehyung CHO, Yuuta KATSURAYAMA, Ryousuke TAKAHASHI, Yuri HIRONO
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Patent number: 11264556Abstract: The present invention provides a piezoelectric sensor that has elastic properties in a surface direction thereof, and can smoothly follow stretching of a body to be measured to accurately measure movement of the body to be measured, and detect movement in a surface direction of a surface of the body to be measured on which the piezoelectric sensor is disposed. The piezoelectric sensor of the present invention includes: a piezoelectric sheet including a porous synthetic resin sheet; a signal electrode layer that is layered on a surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties; and a ground electrode layer that is layered on another surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties.Type: GrantFiled: September 6, 2017Date of Patent: March 1, 2022Assignee: SEKISUI CHEMICAL CO., LTD.Inventors: Nobuto Kamiya, Tetsuhiro Kato, Yuuta Katsurayama, Kazuyoshi Iwane
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Publication number: 20210280770Abstract: The present invention provides a piezoelectric sensor that has elastic properties in a surface direction thereof, and can smoothly follow stretching of a body to be measured to accurately measure movement of the body to be measured, and detect movement in a surface direction of a surface of the body to be measured on which the piezoelectric sensor is disposed. The piezoelectric sensor of the present invention includes: a piezoelectric sheet including a porous synthetic resin sheet; a signal electrode layer that is layered on a surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties; and a ground electrode layer that is layered on another surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties.Type: ApplicationFiled: September 6, 2017Publication date: September 9, 2021Applicant: SEKISUI CHEMICAL CO., LTD.Inventors: Nobuto KAMIYA, Tetsuhiro KATO, Yuuta KATSURAYAMA, Kazuyoshi IWANE
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Publication number: 20210257165Abstract: The present invention provides an electret sheet that has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body. The electret sheet of the present invention has an air permeability of 10 to 1,000 sec/100 mL. Thus, the electret sheet has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body.Type: ApplicationFiled: August 23, 2019Publication date: August 19, 2021Applicant: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro KATO, Nobuto KAMIYA, Yasuyuki SHIRASAKA, Yuuta KATSURAYAMA, Ryousuke TAKAHASHI
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Publication number: 20210249195Abstract: The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5 N or less) caused by a pulse wave or a breathing.Type: ApplicationFiled: April 29, 2021Publication date: August 12, 2021Applicant: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro KATO, Nobuto KAMIYA, Masahiro TSUCHIYA, Yuuta KATSURAYAMA, Yasuyuki SHIRASAKA
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Patent number: 11024463Abstract: The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5 N or less) caused by a pulse wave or a breathing.Type: GrantFiled: February 3, 2017Date of Patent: June 1, 2021Assignee: Sekisui Chemical Co., Ltd.Inventors: Tetsuhiro Kato, Nobuto Kamiya, Masahiro Tsuchiya, Yuuta Katsurayama, Yasuyuki Shirasaka
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Patent number: 10978252Abstract: The present invention provides an electret sheet that retains high piezoelectricity under high-temperature condition. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a volume resistivity of 1.0×1015 ?·cm or more at 25° C. and a dielectric breakdown voltage of 7 kV or more at 25° C. The electret sheet preferably having a volume resistivity of 1.0×1014 ?·cm or more at 37° C. and a dielectric breakdown voltage of 7 kV or more at 37° C. retains excellent piezoelectricity even after being left under a high-temperature atmosphere over a long period.Type: GrantFiled: February 3, 2017Date of Patent: April 13, 2021Assignee: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro Kato, Nobuto Kamiya, Masahiro Tsuchiya, Yuuta Katsurayama, Yasuyuki Shirasaka
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Publication number: 20190057816Abstract: The present invention provides an electret sheet that retains high piezoelectricity under high-temperature condition. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a volume resistivity of 1.0×1015 ??cm or more at 25° C. and a dielectric breakdown voltage of 7 kV or more at 25° C. The electret sheet preferably having a volume resistivity of 1.0×1014 ??cm or more at 37° C. and a dielectric breakdown voltage of 7 kV or more at 37° C. retains excellent piezoelectricity even after being left under a high-temperature atmosphere over a long period.Type: ApplicationFiled: February 3, 2017Publication date: February 21, 2019Applicant: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro KATO, Nobuto KAMIYA, Masahiro TSUCHIYA, Yuuta KATSURAYAMA, Yasuyuki SHIRASAKA
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Publication number: 20190043672Abstract: The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5 N or less) caused by a pulse wave or a breathing.Type: ApplicationFiled: February 3, 2017Publication date: February 7, 2019Applicant: SEKISUI CHEMICAL CO., LTD.Inventors: Tetsuhiro KATO, Nobuto KAMIYA, Masahiro TSUCHIYA, Yuuta KATSURAYAMA, Yasuyuki SHIRASAKA