Patents by Inventor Namitsugu Fujii
Namitsugu Fujii 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: 9804119Abstract: An A/F sensor element includes a substrate made of an insulating ceramic having a bottomed cylindrical shape, an electrolyte part made of a solid electrolyte, and a pair of electrode portions. The electrolyte part is embedded in at least a portion of the side wall of the substrate. The A/F sensor element is used by inserting a rod-like heater in the substrate having the bottomed cylindrical shape. The substrate is formed of the insulating ceramic at a contact position to the heater within the substrate. In a manufacturing of the substrate, a molded body having a space for a forming position of the electrolyte part is formed by using substrate-forming clay, and then the molded body is molded by filling electrolyte-forming clay into the space.Type: GrantFiled: January 30, 2017Date of Patent: October 31, 2017Assignee: DENSO CORPORATIONInventors: Masami Saitou, Namitsugu Fujii, Norikazu Kajiyama
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Publication number: 20170138892Abstract: An A/F sensor element includes a substrate made of an insulating ceramic having a bottomed cylindrical shape, an electrolyte part made of a solid electrolyte, and a pair of electrode portions. The electrolyte part is embedded in at least a portion of the side wall of the substrate. The A/F sensor element is used by inserting a rod-like heater in the substrate having the bottomed cylindrical shape. The substrate is formed of the insulating ceramic at a contact position to the heater within the substrate. In a manufacturing of the substrate, a molded body having a space for a forming position of the electrolyte part is formed by using substrate-forming clay, and then the molded body is molded by filling electrolyte-forming clay into the space.Type: ApplicationFiled: January 30, 2017Publication date: May 18, 2017Inventors: Masami SAITOU, Namitsugu Fujii, Norikazu Kajiyama
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Patent number: 9594050Abstract: An A/F sensor element includes a substrate made of an insulating ceramic having a bottomed cylindrical shape, an electrolyte part made of a solid electrolyte, and a pair of electrode portions. The electrolyte part is embedded in at least a portion of the side wall of the substrate. The A/F sensor element is used by inserting a rod-like heater in the substrate having the bottomed cylindrical shape. The substrate is formed of the insulating ceramic at a contact position to the heater within the substrate. In a manufacturing of the substrate, a molded body having a space for a forming position of the electrolyte part is formed by using substrate-forming clay, and then the molded body is molded by filling electrolyte-forming clay into the space.Type: GrantFiled: April 11, 2014Date of Patent: March 14, 2017Assignee: DENSO CORPORATIONInventors: Masami Saitou, Namitsugu Fujii, Norikazu Kajiyama
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Patent number: 9540282Abstract: A gas sensor element includes a basal body, at least one solid electrolyte portion and a pair of electrodes. The basal body has a bottomed tubular shape and is made of an electrically insulative ceramic material. The basal body has a side wall and a bottom wall. The at least one solid electrolyte portion is formed in the bottom wall or the side wall of the basal body. The pair of electrodes are opposed to each other with the at least one solid electrolyte portion interposed therebetween. The difference in surface level between the basal body and the at least one solid electrolyte portion at a boundary therebetween is less than or equal to 30 ?m.Type: GrantFiled: March 15, 2013Date of Patent: January 10, 2017Assignee: DENSO CORPORATIONInventors: Masami Saitou, Namitsugu Fujii, Norikazu Kajiyama
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Patent number: 9340680Abstract: Disclosed is a spinel powder obtained by mixing a magnesia raw-material with an electrically fused alumina, followed by firing of the mixture. The particles of the spinel powder are coated with granular spinel particles. Therefore, there are provided a spinel powder and a simple method for producing the same, which is superior in thermal spraying property and has a unique particle shape. In particular, there is provided a method for producing a spinel powder which contributes to a reduction in the variation of characteristics of sensors, for example, as a thermal spraying powder for forming a protective coating of a gas sensor element.Type: GrantFiled: March 29, 2012Date of Patent: May 17, 2016Assignees: DAIICHI KIGENSO KAGAKU KOGYO CO., LTD., DENSO CORPORATIONInventors: Namitsugu Fujii, Ryo Nishizawa, Takuji Nabeta
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Publication number: 20140305798Abstract: An A/F sensor element includes a substrate made of an insulating ceramic having a bottomed cylindrical shape, an electrolyte part made of a solid electrolyte, and a pair of electrode portions. The electrolyte part is embedded in at least a portion of the side wall of the substrate. The A/F sensor element is used by inserting a rod-like heater in the substrate having the bottomed cylindrical shape. The substrate is formed of the insulating ceramic at a contact position to the heater within the substrate. In a manufacturing of the substrate, a molded body having a space for a forming position of the electrolyte part is formed by using substrate-forming clay, and then the molded body is molded by filling electrolyte-forming clay into the space.Type: ApplicationFiled: April 11, 2014Publication date: October 16, 2014Applicant: DENSO CORPORATIONInventors: Masami SAITOU, Namitsugu FUJII, Norikazu KAJIYAMA
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Publication number: 20140305797Abstract: A lambda sensor element includes a substrate made of an insulating ceramic having a bottomed cylindrical shape, an electrolyte part made of a solid electrolyte, and a pair of electrode portions. The electrolyte part is embedded in at least a portion of the side wall of the substrate. The lambda sensor element is used by inserting a rod-like heater in the substrate having the bottomed cylindrical shape. The substrate is formed of the insulating ceramic at a contact position to the heater within the substrate. In a manufacturing of the substrate, a molded body having a space for a forming position of the electrolyte part is formed by using substrate-forming clay, and then the molded body is molded by filling electrolyte-forming clay into the space.Type: ApplicationFiled: April 11, 2014Publication date: October 16, 2014Applicant: DENSO CORPORATIONInventors: Masami SAITOU, Namitsugu FUJII, Norikazu KAJIYAMA
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Patent number: 8673128Abstract: A gas sensor element includes an insulating ceramic base, a solid electrolyte body, and a heating element. The solid electrolyte body is disposed in an opening of the insulating ceramic base and has a measuring electrode affixed to one of major surfaces thereof and a reference electrode affixed to the other major surface. The measuring electrode is exposed to gas to be measured. The reference electrode is exposed to a reference gas. The heating element works to activate the solid electrolyte body and is mounted on one of opposed surfaces of the insulating ceramic base on the same side as the major surface of the solid electrolyte body on which the reference electrode is disposed. Specifically, the insulating ceramic base is located between the solid electrolyte body and the heating element, thereby ensuring a desired degree of electric insulation between the heating element and the reference electrode.Type: GrantFiled: September 27, 2012Date of Patent: March 18, 2014Assignee: Denso CorporationInventors: Masami Saitou, Namitsugu Fujii, Norikazu Kajiyama
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Publication number: 20140050842Abstract: Disclosed is a spinel powder obtained by mixing a magnesia raw-material with an electrically fused alumina, followed by firing of the mixture. The particles of the spinel powder are coated with granular spinel particles. Therefore, there are provided a spinel powder and a simple method for producing the same, which is superior in thermal spraying property and has a unique particle shape. In particular, there is provided a method for producing a spinel powder which contributes to a reduction in the variation of characteristics of sensors, for example, as a thermal spraying powder for forming a protective coating of a gas sensor element.Type: ApplicationFiled: March 29, 2012Publication date: February 20, 2014Applicants: DENSO CORPORATION, DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.Inventors: Namitsugu Fujii, Ryo Nishizawa, Takuji Nabeta
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Publication number: 20130240354Abstract: A gas sensor element includes a basal body, at least one solid electrolyte portion and a pair of electrodes. The basal body has a bottomed tubular shape and is made of an electrically insulative ceramic material. The basal body has a side wall and a bottom wall. The at least one solid electrolyte portion is formed in the bottom wall or the side wall of the basal body. The pair of electrodes are opposed to each other with the at least one solid electrolyte portion interposed therebetween. The difference in surface level between the basal body and the at least one solid electrolyte portion at a boundary therebetween is less than or equal to 30 ?m.Type: ApplicationFiled: March 15, 2013Publication date: September 19, 2013Applicant: DENSO CORPORATIONInventors: Masami SAITOU, Namitsugu FUJII, Norikazu KAJIYAMA
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Patent number: 7211222Abstract: A powder filler is stuffed in a filler space defined between a housing and a gas sensing element so as to airtightly seal a clearance between the housing and the gas sensing element. The powder filler contains grains whose diameter is in a range from 80 ?m to 5,000 ?m when measured before being stuffed into the filler space. A weight percentage of the grains having the diameter of 80 ?m to 5,000 ?m is equal to or larger than 80% with respect to an overall weight of the powder filler.Type: GrantFiled: July 24, 2002Date of Patent: May 1, 2007Assignee: Denso CorporationInventors: Motoaki Satou, Kiyomi Kobayashi, Masanobu Yamauchi, Namitsugu Fujii
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Patent number: 7160422Abstract: A multilayered gas sensing element 2 is positioned in a cylindrical housing 10 via a cylindrical insulator 3. The multilayered gas sensing element 2 includes a narrow-width portion 21 and a wide-width portion 22. The wide-width portion 22 is in a fixed relationship with respect to the insulator 3. The narrow-width portion 21 is in a floating relationship with respect to the insulator 3. The narrow-width portion 21 has a gas sensing portion for detecting the concentration of a specific gas contained in a measuring objective gas.Type: GrantFiled: April 2, 2003Date of Patent: January 9, 2007Assignee: Denso CorporationInventors: Shinichiro Imamura, Susumu Naito, Makoto Nakae, Namitsugu Fujii
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Patent number: 7156967Abstract: The present invention provides a gas sensor element and its production method, in which poisons are trapped in a porous protective layer to prevent them from reaching a measured gas side electrode, thereby making it possible to maintain a stable sensor output over a long period of time. The gas sensor element of the present invention is composed of a solid electrolyte 10, and a measured gas side electrode 12 that contacts a measured gas and a reference gas side electrode 11 that contacts a reference gas provided on said solid electrolyte 10; wherein, the above measured gas side electrode 12 is covered with a porous protective layer 14 composed of a heat-resistant metal oxide containing a getter, and the above getter is an alkaline silicate.Type: GrantFiled: December 3, 2002Date of Patent: January 2, 2007Assignee: Denso CorporationInventors: Yasumichi Hotta, Namitsugu Fujii, Xin Fu, legal representative, Gang E, deceased
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Patent number: 7045047Abstract: A gas sensor element which may be employed in measuring the concentration of gas such O2, NOx, or CO. The gas sensor element consists of an electrochemical cell made up of a solid electrolyte body formed by a partially stabilized zirconia and a pair of electrodes disposed on the solid electrolyte body. The electrochemical cell is subjected to an aging treatment in which the dc current is applied to the electrodes at a given voltage to enhance the activation of the electrochemical cell.Type: GrantFiled: December 20, 2002Date of Patent: May 16, 2006Assignee: Denso CorporationInventors: Makoto Nakae, Susumu Naito, Namitsugu Fujii, Hiromi Sano, Tomio Sugiyama, Kazuya Nakagawa
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Publication number: 20060068095Abstract: An active liquid applicator is provided which is designed to coat a surface of an electronic parts such as an oxygen sensor with an active liquid for forming an electrode. The liquid applicator includes a nozzle head and a nozzle tube. The nozzle tube has disposed therein a pearmable member which produces capillary attraction of an active liquid thereinto and feed it to the nozzle head, thereby enabling formation of a thin active film on the electronic part which has the thickness controllable with high accuracy.Type: ApplicationFiled: November 15, 2005Publication date: March 30, 2006Applicant: Denso CorporationInventors: Tsuyoshi Nishi, Tomoaki Tsujimoto, Akio Harada, Kiyomi Kobayashi, Motoaki Satou, Namitsugu Fujii
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Patent number: 6849291Abstract: A gas sensing element has a solid electrolytic body, a reference gas side electrode provided on a surface of the solid electrolytic body so as to be exposed to a reference gas, and a measured gas side electrode provided on another surface of the solid electrolytic body so as to be exposed to a measured gas. A crystal face strength ratio of the measured gas side electrode according to X-ray diffraction is 0.7?{I(200)/I(111)} or 0.6?{I(220)/I(111)}.Type: GrantFiled: October 17, 2002Date of Patent: February 1, 2005Assignee: Denso CorporationInventors: Gang E, Kiyomi Kobayashi, Yasumichi Hotta, Namitsugu Fujii
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Publication number: 20050016258Abstract: A ceramic laminate includes a first ceramic layer and a second ceramic layer which are laminated with each other via a bonding layer. The first ceramic layer has gas permeability. The second ceramic layer has gas impermeability. A method for forming this ceramic laminate includes a step of forming first and second ceramic layer forming green sheets, a step of coating a bonding layer forming paste on the second ceramic layer forming green sheet, and a step of integrally bonding the first ceramic layer forming green sheet with the bonding layer forming paste into a laminated body and then sintering the laminated body.Type: ApplicationFiled: July 26, 2004Publication date: January 27, 2005Applicant: Denso CorporationInventors: Kazunori Suzuki, Namitsugu Fujii, Shoichiro Emmei, Atsushi Iwata, Katsumi Kozaki, Yoshihiro Kinoshita
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Patent number: 6776895Abstract: A method of manufacturing a gas sensor element which includes a solid electrolyte body, a target gas electrode a reference gas electrode provided on a surface of the solid electrolyte body so as to be exposed to a reference gas and the manufacturing method includes exposing the gas sensor element to a gas atmosphere containing at least one of a hydrocarbon gas, a CO2 gas, and a H2 gas and applying an ac voltage to said target gas electrode and the reference gas electrode. Each of the target gas electrode and the reference gas electrode is made up of a plurality of crystal grains defined by grain boundaries having a total length of 1000 &mgr;m or more in a surface area of 100 &mgr;m2.Type: GrantFiled: March 20, 2003Date of Patent: August 17, 2004Assignee: Denso CorporationInventors: Tooru Katafuchi, Yasumichi Hotta, Namitsugu Fujii
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Publication number: 20040007462Abstract: The present invention provides a gas sensor element and its production method, in which poisons are trapped in a porous protective layer to prevent them from reaching a measured gas side electrode, thereby making it possible to maintain a stable sensor output over a long period of time.Type: ApplicationFiled: December 3, 2002Publication date: January 15, 2004Inventors: Yasumichi Hotta, Namitsugu Fujii, Gang E, Xin Fu
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Patent number: 6660145Abstract: An oxygen sensor element is provided which may be used in an oxygen sensor designed to measure the concentration of oxygen contained in exhaust gasses of an automotive internal combustion engine. The gas sensor element includes a solid electrolyte body, a target gas electrode, a reference gas electrode, and a catalytic layer formed over the target gas electrode. The catalytic layer is made of heat resisting ceramic grains which hold thereon catalytic metal grains whose average grain size is 0.3 to 2.0 &mgr;m, a weight of catalytic metal grains per unit area of the catalytic layer, as defined by projecting the target gas electrode on a plane, is 10 to 200 &mgr;g/cm2. This facilitates the reaction of exhaust gasses such as H2, NOx, and HC with O2 over the target gas electrode, thus resulting in improved accuracy of a sensor output over a wide temperature range.Type: GrantFiled: September 25, 2001Date of Patent: December 9, 2003Assignee: Denso CorporationInventors: Yasumichi Hotta, Hiroshi Sugino, Tooru Katafuchi, Namitsugu Fujii