Patents by Inventor Shota IMADA
Shota IMADA 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: 11714062Abstract: A gas sensor element for detecting a specific gas component in a measured gas, comprising: an element body in the form of a long plate having a gas detection part at an end thereof on a distal end face side in a longitudinal direction; and a porous protective layer covering an outer periphery of the end on said end face side of the element body, wherein in a cross section including two adjacent ones of the end face and side faces connected to the end face, an outer surface of the protective layer facing an element corner where the two faces meet has a shape with a corner part, and a ratio of an assumed diameter of a water droplet contained in the measured gas in a use environment to an effective length of the corner part in the cross section is equal to or larger than 1.5.Type: GrantFiled: February 10, 2020Date of Patent: August 1, 2023Assignee: DENSO CORPORATIONInventors: Tomotaka Mouri, Shota Imada, Toru Takeuchi
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Patent number: 11604160Abstract: A gas sensor includes a sensor element, and the sensor element includes a bottomed tubular solid electrolyte, a detection electrode provided on an outer surface of the solid electrolyte, a reference electrode provided on an inner surface of the solid electrolyte. The detection electrode of the sensor element includes a detection electrode section provided at a position on a tip side of an axial direction, an attachment electrode section provided at a position on a base end side of the axial direction, and a lead electrode section provided at a position where the detection electrode section is connected to the attachment electrode section. An insulating layer is provided between a tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section.Type: GrantFiled: October 18, 2019Date of Patent: March 14, 2023Assignee: DENSO CORPORATIONInventors: Makoto Nakae, Shota Imada
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Patent number: 11555463Abstract: A gas sensor element comprising a long plate-like element body and a porous protective layer protecting a surface of the element body, wherein the element body has a gas detection part at an end thereof on one end face side in a longitudinal direction, and the protective layer includes an end face part covering the one end face in laminate, side face parts covering side faces connected to the one end face in laminate, and corner parts where two adjacent ones of the end face part and the side face parts meet. An outer surface of one or more of the end face part and the side face parts has a concave shape that is smoothly continuous with the corner parts and configured such that a layer thickness increases toward the corner parts.Type: GrantFiled: February 10, 2020Date of Patent: January 17, 2023Assignee: DENSO CORPORATIONInventors: Shota Imada, Tomotaka Mouri, Toru Takeuchi
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Publication number: 20220113276Abstract: The sensor element of a gas sensor includes an element body, a surface protective layer provided at the outermost surface position of a tip portion of the element body, in the longitudinal direction of the element body, and an internal protective layer provided between the surface protective layer and the element body. The internal protective layer has a lower thermal conductivity and a higher average porosity than the surface protective layer, and is disposed between the surface protective layer and the element body. In the internal protective layer, a first protective layer portion of the internal protective layer is located on a side that faces the heater, and at least the base position is positioned closer in the longitudinal direction to the tip end of the element body than is the maximum temperature position on the element body.Type: ApplicationFiled: December 21, 2021Publication date: April 14, 2022Inventors: Shota IMADA, Satoshi SUZUKI, Takumi USHIKUBO
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Publication number: 20210270200Abstract: A gas sensor includes a sensor element body having a porous layer provided on an outer surface, and a power supply device which supplies power to a heater element that is in the sensor element body. The amount of power being applied to the heater element by the power supply device when gas detection is being performed by the gas sensor in a steady state is designated as P [W], the volume of the length range of a heating region of the heater element provided in the sensor element body as V [mm3], and the applied power density as X [W/mm3], where X is a value expressed by P/V. In that case, the following relationship is satisfied between the applied power density X and the average thickness Y [?m] of the porous layer: Y?509.32?2884.89X+5014.Type: ApplicationFiled: April 28, 2020Publication date: September 2, 2021Inventors: Toru TAKEUCHI, Tomotaka MORI, Shota IMADA, Yoshiharu MIYAKE, Hiroki NISHIJIMA, Haruki KONDO, Yasushi HIRATA
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Publication number: 20200256270Abstract: A gas sensor includes a sensor element body having a porous layer provided on an outer surface, and a power supply device which supplies power to a heater element that is in the sensor element body. The amount of power being applied to the heater element by the power supply device when gas detection is being performed by the gas sensor in a steady state is designated as P [W], the volume of the length range of a heating region of the heater element provided in the sensor element body as V [mm3], and the applied power density as X [W/mm3], where X is a value expressed by P/V. In that case, the following relationship is satisfied between the applied power density X and the average thickness Y [?m] of the porous layer: Y?509.32?2884.89X+5014.Type: ApplicationFiled: April 28, 2020Publication date: August 13, 2020Inventors: Toru TAKEUCHI, Tomotaka MORI, Shota IMADA, Yoshiharu MIYAKE, Hiroki NISHIJIMA, Haruki KONDO, Yasushi HIRATA
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Publication number: 20200182182Abstract: A gas sensor element comprising a long plate-like element body and a porous protective layer protecting a surface of the element body, wherein the element body has a gas detection part at an end thereof on one end face side in a longitudinal direction, and the protective layer includes an end face part covering the one end face in laminate, side face parts covering side faces connected to the one end face in laminate, and corner parts where two adjacent ones of the end face part and the side face parts meet. An outer surface of one or more of the end face part and the side face parts has a concave shape that is smoothly continuous with the corner parts and configured such that a layer thickness increases toward the corner parts.Type: ApplicationFiled: February 10, 2020Publication date: June 11, 2020Inventors: Shota IMADA, Tomotaka MOURI, Toru TAKEUCHI
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Publication number: 20200173957Abstract: A gas sensor element for detecting a specific gas component in a measured gas, comprising: an element body in the form of a long plate having a gas detection part at an end thereof on a distal end face side in a longitudinal direction; and a porous protective layer covering an outer periphery of the end on said end face side of the element body, wherein in a cross section including two adjacent ones of the end face and side faces connected to the end face, an outer surface of the protective layer facing an element corner where the two faces meet has a shape with a corner part, and a ratio of an assumed diameter of a water droplet contained in the measured gas in a use environment to an effective length of the corner part in the cross section is equal to or larger than 1.5.Type: ApplicationFiled: February 10, 2020Publication date: June 4, 2020Inventors: Tomotaka MOURI, Shota IMADA, Toru TAKEUCHI
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Publication number: 20200049653Abstract: A gas sensor includes a sensor element, and the sensor element includes a bottomed tubular solid electrolyte, a detection electrode provided on an outer surface of the solid electrolyte, a reference electrode provided on an inner surface of the solid electrolyte. The detection electrode of the sensor element includes a detection electrode section provided at a position on a tip side of an axial direction, an attachment electrode section provided at a position on a base end side of the axial direction, and a lead electrode section provided at a position where the detection electrode section is connected to the attachment electrode section. An insulating layer is provided between a tube of the solid electrolyte and each of the attachment electrode section and the lead electrode section.Type: ApplicationFiled: October 18, 2019Publication date: February 13, 2020Inventors: Makoto NAKAE, Shota IMADA
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Patent number: 9583916Abstract: An alumina sintered body has a main phase made of alumina crystals, a first dispersed phase made of MgAl2O4 dispersed in the main phase, and a second dispersed phase made of SiO2 and/or CaO dispersed in the main phase. A content ratio of the main phase is within a range from not less than 98% to less than 98%. The alumina sintered body satisfies a relationship of 100×I2/I1?5.5%, where I1 indicates a maximum peak height intensity derived from alumina, and I2 indicates a maximum peak height intensity derived from MgAl2O4 in a X-ray diffraction of the alumina sintered body. An area ratio of the second dispersed phase on a surface of the alumina sintered body is not more than 15.2%. A spark plug has a central electrode, a ground electrode and an insulator made of the alumina sintered body having the specific features previously described.Type: GrantFiled: February 25, 2016Date of Patent: February 28, 2017Assignee: DENSO CORPORATIONInventors: Shota Imada, Hirofumi Suzuki, Hiroshi Araki
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Publication number: 20160254651Abstract: An alumina sintered body has a main phase made of alumina crystals, a first dispersed phase made of MgAl2O4 dispersed in the main phase, and a second dispersed phase made of SiO2 and/or CaO dispersed in the main phase. A content ratio of the main phase is within a range from not less than 98% to less than 98%. The alumina sintered body satisfies a relationship of 100×I2/I1?5.5%, where I1 indicates a maximum peak height intensity derived from alumina, and I2 indicates a maximum peak height intensity derived from MgAl2O4 in a X-ray diffraction of the alumina sintered body. An area ratio of the second dispersed phase on a surface of the alumina sintered body is not more than 15.2%. A spark plug has a central electrode, a ground electrode and an insulator made of the alumina sintered body having the specific features previously described.Type: ApplicationFiled: February 25, 2016Publication date: September 1, 2016Inventors: Shota IMADA, Hirofumi SUZUKI, Hiroshi ARAKI
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Patent number: 9302942Abstract: An alumina sintered body contains a main phase consisting of alumina crystal, and crystalline phases dispersed in the main phase. The crystalline phases consist of at least one selected from a group consisting of MgAl2O4, 2MgO.2Al2O3.5SiO2, 2MgO.SiO2 and MgO.SiO2. The average grain size of the crystalline phases is 0.4 ?m to 5.3 ?m. In an arbitrary area having a size of 100 ?m×100 ?m in a cross-section of the alumina sintered body, the number of the crystalline phases having grain sizes 1 ?m to 5 ?m is 8 to 412.Type: GrantFiled: July 23, 2015Date of Patent: April 5, 2016Assignee: DENSO CORPORATIONInventor: Shota Imada
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Publication number: 20160023953Abstract: An alumina sintered body contains a main phase consisting of alumina crystal, and crystalline phases dispersed in the main phase. The crystalline phases consist of at least one selected from a group consisting of MgAl2O4, 2MgO.2Al2O3.5SiO2, 2MgO.SiO2 and MgO.SiO2. The average grain size of the crystalline phases is 0.4 ?m to 5.3 ?m. In an arbitrary area having a size of 100 ?m×100 ?m in a cross-section of the alumina sintered body,the number of the crystalline phases having grain sizes 1 ?m to 5 ?m is 8 to 412.Type: ApplicationFiled: July 23, 2015Publication date: January 28, 2016Inventor: Shota IMADA