Patents by Inventor Hironobu Mizutani
Hironobu Mizutani 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: 10153620Abstract: A spark plug having a ceramic insulator held by a crimp portion of a metallic shell. The crimp portion satisfies a relation of A?1.7 mm and a relation of t?1.20 mm in a cross section of the crimp portion taken along a plane containing the axial line, where A is the distance between a closest point which is a point within the cross section closest to the ceramic insulator and an intersection at which a first orthogonal line passing through the closest point and orthogonal to the axial line intersects with an outer circumference of the crimp portion, and t is a thickness of the proximal end of the crimp portion.Type: GrantFiled: March 28, 2016Date of Patent: December 11, 2018Assignee: NGK SPARK PLUG CO., LTD.Inventors: Kentaro Kiuchi, Kazuhiko Mori, Hironobu Mizutani, Yuusuke Teranishi
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Patent number: 10063037Abstract: A spark plug includes a central electrode and a noble metal tip, which are joined together with a fusion portion interposed therebetween. A tip-adjoining boundary of the fusion portion has a shape that curves convexly toward the fusion portion. A central-electrode-adjoining boundary of the fusion portion has a shape that curves convexly toward the central electrode. The outline of a portion of the fusion portion exposed to the outer surface has a shape that curves concavely into the inner side of the fusion portion.Type: GrantFiled: January 6, 2017Date of Patent: August 28, 2018Assignee: NGK SPARK PLUG CO., LTD.Inventors: Masaki Tokumaru, Kazuhiko Mori, Kei Takahashi, Hironobu Mizutani
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Publication number: 20180212405Abstract: A spark plug having a ceramic insulator held by a crimp portion of a metallic shell. The crimp portion satisfies a relation of A?1.7 mm and a relation of t?1.20 mm in a cross section of the crimp portion taken along a plane containing the axial line, where A is the distance between a closest point which is a point within the cross section closest to the ceramic insulator and an intersection at which a first orthogonal line passing through the closest point and orthogonal to the axial line intersects with an outer circumference of the crimp portion, and t is a thickness of the proximal end of the crimp portion.Type: ApplicationFiled: March 28, 2016Publication date: July 26, 2018Applicant: NGK SPARK PLUG CO., LTD.Inventors: Kentaro KIUCHI, Kazuhiko MORI, Hironobu MIZUTANI, Yuusuke TERANISHI
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Publication number: 20170201074Abstract: A spark plug includes a central electrode and a noble metal tip, which are joined together with a fusion portion interposed therebetween. A tip-adjoining boundary of the fusion portion has a shape that curves convexly toward the fusion portion. A central-electrode-adjoining boundary of the fusion portion has a shape that curves convexly toward the central electrode. The outline of a portion of the fusion portion exposed to the outer surface has a shape that curves concavely into the inner side of the fusion portion.Type: ApplicationFiled: January 6, 2017Publication date: July 13, 2017Inventors: Masaki TOKUMARU, Kazuhiko MORI, Kei TAKAHASHI, Hironobu MIZUTANI
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Patent number: 9236716Abstract: An ignition plug having a center electrode, a grounding electrode, an insulator, and a metal shell. The center electrode is held by the insulator, and the insulator is held by metal shell. A cavity is formed between the grounding electrode and the center electrode. The grounding electrode is joined to the inner wall surface of the metal shell via a melting portion. In the melting portion, in a predetermined cutting surface MS including a melting deepest point DP and a central axis CX, a percentage ratio MDD of a melting depth MD of the melting portion with respect to a thickness of the grounding electrode is 5% or more, and an area Sm of a portion included in an outer circumferential side of the metal shell is 10% or more of the entire area S.Type: GrantFiled: November 25, 2014Date of Patent: January 12, 2016Assignee: NGK SPARK PLUG CO., LTD.Inventors: Hironobu Mizutani, Kei Takahashi
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Publication number: 20150145403Abstract: An ignition plug having a center electrode, a grounding electrode, an insulator, and a metal shell. The center electrode is held by the insulator, and the insulator is held by metal shell. A cavity is formed between the grounding electrode and the center electrode. The grounding electrode is joined to the inner wall surface of the metal shell via a melting portion. In the melting portion, in a predetermined cutting surface MS including a melting deepest point DP and a central axis CX, a percentage ratio MDD of a melting depth MD of the melting portion with respect to a thickness of the grounding electrode is 5% or more, and an area Sm of a portion included in an outer circumferential side of the metal shell is 10% or more of the entire area S.Type: ApplicationFiled: November 25, 2014Publication date: May 28, 2015Applicant: NGK Spark Plug Co., Ltd.Inventors: Hironobu MIZUTANI, Kei TAKAHASHI
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Patent number: 7663296Abstract: A spark plug including: a cylindrical insulator having an axial hole extending through the insulator in an axial direction; a center electrode inserted in the axial hole; a metal shell provided around an outer periphery of the insulator and having a leading end surface, from which a leading end surface of the insulator protrudes; a ground electrode having a base end bonded to the leading end surface of the metal shell; and a noble metal tip disposed on a distal end of the ground electrode, an end of the noble metal tip protruding toward the center electrode in a radial direction, wherein: the spark plug forming a spark discharge path upon application of a discharging voltage between the protruding end of the noble metal tip and an end of the center electrode, the spark discharge path including an aerial discharge gap between a part of the protruding end of the noble metal tip and a part of the end of the insulator and a surface-creeping discharge path beginning at a part of the end of the insulator and a partType: GrantFiled: March 29, 2007Date of Patent: February 16, 2010Assignee: NGK Spark Plug Co., Ltd.Inventors: Iwao Kunitomo, Yoshihiro Matsubara, Hironobu Mizutani
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Publication number: 20070228916Abstract: A spark plug including: a cylindrical insulator having an axial hole extending through the insulator in an axial direction; a center electrode inserted in the axial hole; a metal shell provided around an outer periphery of the insulator and having a leading end surface, from which a leading end surface of the insulator protrudes; a ground electrode having a base end bonded to the leading end surface of the metal shell; and a noble metal tip disposed on a distal end of the ground electrode, an end of the noble metal tip protruding toward the center electrode in a radial direction, wherein: the spark plug forming a spark discharge path upon application of a discharging voltage between the protruding end of the noble metal tip and an end of the center electrode, the spark discharge path including an aerial discharge gap between a part of the protruding end of the noble metal tip and a part of the end of the insulator and a surface-creeping discharge path beginning at a part of the end of the insulator and a partType: ApplicationFiled: March 29, 2007Publication date: October 4, 2007Applicant: NGK SPARK PLUG CO., LTD.Inventors: Iwao Kunitomo, Yoshihiro Matsubara, Hironobu Mizutani