Patents by Inventor Tsutomu Shibata

Tsutomu Shibata 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).

  • Patent number: 8664842
    Abstract: A spark plug including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode, the ground electrode has an outer layer which is formed from an Ni-based alloy and a core portion which is covered by the outer layer and formed from a material having a thermal conductivity higher than that of the outer layer. Further, the melting point of the Ni-based alloy forming the outer layer is 1150° C. or more and 1350° C. or less.
    Type: Grant
    Filed: January 11, 2011
    Date of Patent: March 4, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Tomoo Tanaka, Tsutomu Shibata, Osamu Yoshimoto, Takaaki Kikai, Takehito Kuno, Kenji Nunome
  • Patent number: 8618725
    Abstract: A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle ?1 formed by a straight line L1 and a straight line L2 satisfies the relational expression ?1?72°.
    Type: Grant
    Filed: February 3, 2011
    Date of Patent: December 31, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Daisuke Sumoyama, Tsutomu Shibata, Tomoo Tanaka
  • Patent number: 8601568
    Abstract: A switching equipment stores identification information of communication established with respect to an infrastructure network system in a storage unit, and when an access request is received from a terminal device, the switching equipment adds the stored identification information to the access request and transfers the access request to a 1× Radius server. When the terminal device having requested the access is authenticated, the 1× Radius server notifies a PANA PAA of address information of the terminal device associated with the identification information added to the access request. The PANA PAA approves the same network access as the switching equipment with respect to the terminal device in the received address information.
    Type: Grant
    Filed: May 29, 2008
    Date of Patent: December 3, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshimichi Tanizawa, Naoki Esaka, Tsutomu Shibata
  • Patent number: 8583794
    Abstract: The storage unit stores therein authentication IDs that are used for authentication of users and address information in association with one another. The authentication processing unit receives from a PC an authentication message that includes an authentication ID and is used for the authentication of the user of a communication terminal, and performs authentication on the user based on the received authentication message. The SIP address acquiring unit acquires from the storage unit address information that corresponds to the authentication ID included in the authentication message when the user is authenticated. The SIP address registering unit sends the SIP location server a registration request for registering the acquired address information as the address information of the user of the IP telephone terminal associated with the PC that transmits the authentication message.
    Type: Grant
    Filed: September 2, 2008
    Date of Patent: November 12, 2013
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshimichi Tanizawa, Naoki Esaka, Tsutomu Shibata
  • Publication number: 20130264939
    Abstract: A spark plug having a connecting portion that electrically connects a center electrode with a metal terminal within an axial bore in an insulator. The connecting portion of the spark plug includes a resistor. A center electrode-side resistance, which is the resistance of a portion of the resistor that extends from the center thereof toward the center electrode in the axial direction, is larger than a metal terminal-side resistance, which is the resistance of a portion of the resistor that extends from the center thereof toward the metal terminal.
    Type: Application
    Filed: September 6, 2011
    Publication date: October 10, 2013
    Inventors: Hoju Fukushima, Takamitsu Mizuno, Tsutomu Shibata, Toshitaka Honda
  • Publication number: 20130200774
    Abstract: A spark plug includes a ceramic insulator having an axial hole formed in an axis direction of the spark plug, a center electrode inserted in a front side of the axial hole, a metal shell disposed around the ceramic insulator and a ground electrode joined to a front end portion of the metal shell, wherein the ground electrode has a cross-sectional area of 2.0 mm2 or smaller in any arbitrary cross section thereof taken in a direction perpendicular to a center line of the ground electrode; the ground electrode is made of a metal material containing 93 mass % or more of nickel; and the ground electrode has a Vickers hardness of 130 to 260 Hv.
    Type: Application
    Filed: October 6, 2011
    Publication date: August 8, 2013
    Inventors: Takaaki Kikai, Tomoo Tanaka, Tsutomu Shibata, Kaori Suzuki, Takehito Kuno
  • Patent number: 8492962
    Abstract: Provided is a spark plug which allows a predetermined resistance to be imparted to a resistor with restraint of variation in resistance of the resistor and in turn, enables enhancement of yield. The spark plug includes a ceramic insulator having an axial hole extending in the direction of an axis CL1, a center electrode, and a terminal electrode. A resistor is provided in the axial hole through sintering of a resistor composition which contains a conductive material such as carbon black, glass powder, and ceramic particles other than glass. As viewed on a section of the resistor taken along a direction orthogonal to the axis CL1, 50% or more of sintered glass powder formed through sintering of the glass powder has a circularity of 0.8 or greater.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: July 23, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Tsutomu Shibata, Keita Nakagawa
  • Publication number: 20130181597
    Abstract: A spark plug is provided having at least one of a center electrode or a ground electrode. The electrode comprises: a core formed of a composite material containing a matrix metal, the matrix metal being copper or a metal containing copper as a main component, and carbon dispersed in the matrix metal in an amount of 10 to 80 vol. %, the carbon having a thermal conductivity higher than that of the matrix metal. The electrode also contains an outer shell which surrounds the core and which is formed of nickel or a metal containing nickel as a main component. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient-between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.
    Type: Application
    Filed: August 24, 2011
    Publication date: July 18, 2013
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Tomo-o Tanaka, Tsutomu Shibata, Takaaki Kikai
  • Publication number: 20130181596
    Abstract: A spark plug includes at least one of a center electrode or a ground electrode that is produced by the steps of: mixing a matrix metal with carbon so that the carbon content of the resultant mixture is adjusted to 80 vol. % or less; subjecting the mixture to powder compacting or sintering, to thereby form a core; placing the core in a cup formed of nickel or a metal containing nickel as a main component; and subjecting the cup to cold working. The thus-produced electrode exhibits favorable thermal conductivity and good heat dissipation, by virtue of the small difference in thermal expansion coefficient between the core and an outer shell. The spark plug including the above electrode exhibits excellent durability.
    Type: Application
    Filed: August 24, 2011
    Publication date: July 18, 2013
    Applicant: NGK Spark Plug Co., Ltd.
    Inventors: Tomo-o Tanaka, Tsutomu Shibata, Takaaki Kikai
  • Publication number: 20130069516
    Abstract: A spark plug includes a ceramic insulator, a center electrode, a metallic shell, and a ground electrode. The center electrode has a shoulder portion at a forward end portion, which tapers forward with respect to the axial direction. A noble metal tip is joined to the forward end portion of the center electrode through a fusion zone. A spark discharge gap is formed between the noble metal tip and the ground electrode. The shortest distance between the fusion zone and a forward end surface of the noble metal tip is 0.8-1.2 mm. The outside diameter of the fusion zone as measured at a forward end of the fusion zone is smaller than that as measured at a rear end of the fusion zone. An acute angle ?1 formed by a straight line L1 and a straight line L2 satisfies the relational expression ?1?72°.
    Type: Application
    Filed: February 3, 2011
    Publication date: March 21, 2013
    Inventors: Daisuke Sumoyama, Tsutomu Shibata, Tomoo Tanaka
  • Publication number: 20130026903
    Abstract: An electrode tip located at an distal end of an electrode of a spark plug comprises Pd as a predominant component in an amount of 40 wt. % or more; at least one element of Ir, Ni, Co, and Fe, wherein, when the tip contains Ir, the amount of Ir is 0.5 wt. % to 20 wt. %, and when the tip contains at least one element of Ni, Co, and Fe, the amount of the at least one element is 0.5 wt. % to 40 wt. %; and at least one element of Pt, Re, Rh, and Ru in a total amount of 5 wt. % to 40 wt. %, wherein when the tip contains at least one element of Re, Rh, and Ru, the amount of the at least one element is 10 wt. % or less, and when the tip contains Pt, the amount of Pt is 16 wt. % to 40 wt. %. The electrode tip, which comprises Pd as the main component, has improved resistance to spark-caused wear and reduced occurrence of separation and cracking of the tip.
    Type: Application
    Filed: January 18, 2011
    Publication date: January 31, 2013
    Applicant: NGK Spark Plug Co., LTD.
    Inventors: Tsutomu Shibata, Tomo-o Tanaka, Daisuke Sumoyama, Takaaki Kikai
  • Patent number: 8350842
    Abstract: Designing of a coping for proper working is made possible. Based on three-dimensional data on a model of an abutment tooth to which a dental prosthesis is applied stored in RAM (Random Access Memory) and on three-dimensional position information about a margin line of the model stored in another RAM, on a face containing a reference axis of the model, three-dimensional position information about a side face of a coping is determined so that a specified angle is formed between a margin line and a surface of the model and three-dimensional position information about the side face of the coping on each of a plurality of different faces containing the reference axis over an entire circumference in a direction surrounding the reference axis is detected by a coping processing section.
    Type: Grant
    Filed: February 14, 2007
    Date of Patent: January 8, 2013
    Assignee: GC Corporation
    Inventors: Tsutomu Shibata, Yoshinori Matsuda
  • Publication number: 20120293061
    Abstract: A spark plug including a center electrode and a ground electrode having a gap between the center electrode and the ground electrode, the ground electrode has an outer layer which is formed from an Ni-based alloy and a core portion which is covered by the outer layer and formed from a material having a thermal conductivity higher than that of the outer layer. Further, the melting point of the Ni-based alloy forming the outer layer is 1150° C. or more and 1350° C. or less.
    Type: Application
    Filed: January 11, 2011
    Publication date: November 22, 2012
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Tomoo Tanaka, Tsutomu Shibata, Osamu Yoshimoto, Takaaki Kikai, Takehito Kuno, Kenji Nunome
  • Patent number: 8307200
    Abstract: An authentication apparatus includes a first storage unit that stores proxy information containing a proxy ID and capability data, an acquiring unit that acquires the proxy information from the first storage unit, a first transmitting unit that transmits a second message containing the acquired proxy information to a terminal, a receiving unit that receives a third message and authentication data, the third message containing a first proxy ID and setting data from the terminal, and an authentication unit that performs an authentication process based on the authentication data, and a second transmitting unit that transmits the setting data to a server to which a proxy of the first proxy ID relays data communication.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: November 6, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshimichi Tanizawa, Naoki Esaka, Tsutomu Shibata
  • Patent number: 8299694
    Abstract: A spark plug with excellent vibration resistance performance and resistor load life-span characteristics, and a reduced diameter which is achieved by strengthening adhesion between a resistor and a conductive glass sealing layer.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: October 30, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Akira Suzuki, Tomoaki Kato, Tsutomu Shibata, Mamoru Musasa
  • Patent number: 8294345
    Abstract: A spark plug (100) has a resistor (15) between a center electrode 3 and a metal terminal (13). The resistor (15) contains glass, ceramic powder, an electrically conductive material, and metal. An average of two or more particles of the metal are present in an arbitrary region measuring 300 (?m)×300 (?m) on an arbitrary section of the resistor (15), and the total sectional area of the metal present in the region accounts for less than 1.6% of the region.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: October 23, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Haruki Yoshida, Keita Nakagawa, Tsutomu Shibata
  • Publication number: 20120256530
    Abstract: A spark plug including a center electrode and a ground electrode having a core portion and an outer layer covering the core portion, the core portion being formed from a material having a thermal conductivity higher than that of the outer layer. At least a portion in which thickness of the outer layer is 0.5 mm or less is present at a cross-section perpendicular to a direction in which the ground electrode is extended. Further, the composition of the electrode material forming the outer layer is as follows: Ni is 96 mass % or more, total of at least one kind selected from Y and rare earth elements is 0.05 mass % or more, Al is 0.5 mass % or less, and Si is 0.5 mass % or more and 1.5 mass % or less, where the total of Ni, Y, rare earth elements, Al, Si does not exceed 100 mass %.
    Type: Application
    Filed: January 19, 2011
    Publication date: October 11, 2012
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Tsutomu Shibata, Takaaki Kikai, Kenji Nunome, Osamu Yoshimoto
  • Patent number: 8283846
    Abstract: The object of the invention is to provide a spark plug including a central electrode and/or a ground electrode with a gap, which can suppress generation of corrosion-like generated foreign substances while maintaining high thermal conductivity and high strength. The gap between the central electrode and the ground electrode with at least one of the central electrode and the ground electrode formed from an electrode material including 96% by mass or more of Ni, in which the electrode material includes a total content of from 0.05% by mass to 0.45% by mass of at least one selected from a group consisting of Y and rare earth elements, 0.05% by mass or more of Mn, and a total content of 0.01% by mass or more of at least one selected from a group consisting of Ti, V, and Nb, and the ratio (a/b) of the total content (a) of Ti, V, and Nb to the content (b) of Mn is from 0.02 to 0.40.
    Type: Grant
    Filed: October 15, 2010
    Date of Patent: October 9, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Tsutomu Shibata, Takehito Kuno, Tomoo Tanaka, Kenji Nunome, Shoichiro Nagatomo
  • Publication number: 20120217864
    Abstract: A spark plug having an insulator that can be restrained from cracking in an environment of heating and cooling cycles. The spark plug includes an insulator having an axial bore extending in the direction of the axis, and a center electrode held in one end portion of the axial bore. The center electrode has an outer layer, and a core provided within the outer layer and formed from a material higher in thermal conductivity than the outer layer. After a heat treatment, the outer layer has a high-hardness region having a hardness of 190 Hv or higher and a thickness of 30 ?m to 200 ?m, and an element supply region having a thickness of 50 ?m or more.
    Type: Application
    Filed: February 9, 2012
    Publication date: August 30, 2012
    Inventors: Daisuke Sumoyama, Tomoo Tanaka, Tsutomu Shibata
  • Patent number: 8217563
    Abstract: A spark plug having sufficient durability for an internal combustion engine can restrain a sharp increase in resistance of a resistor in spite of its reduced size. The spark plug comprises an insulator having an axial hole, a metallic shell provided on the outer circumference of the insulator, a center electrode inserted into a front end portion of the axial hole, a terminal electrode inserted into a rear end portion of the axial hole, and a ground electrode. A circular columnar resistor is disposed within the axial hole between the center electrode and the terminal electrode, thereby electrically connecting the center electrode and the terminal electrode. The resistor is composed of carbon black that serves as a conductive material, a glass powder, and ceramic particles. Each of the ceramic particles has a maximum particle size of 0.5 ?m or less.
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: July 10, 2012
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Tsutomu Shibata, Keita Nakagawa