Patents by Inventor Masakazu Tanaka

Masakazu Tanaka 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).

  • Publication number: 20110296361
    Abstract: A maximum delay of a combinational circuit is accurately reduced in consideration of a correlation between variations in delays of devices (transistors etc.) and interconnects. Circuit modification candidate information about a circuit modification candidate for improving a delay of a circuit to be designed is generated based on circuit information about the circuit to be designed, technology information about a distribution of a characteristic of a device and/or an interconnect based on a process to be designed, delay distribution information about a distribution of the delay in the circuit to be designed, and delay correlation information about a correlation between variations in the delay in the circuit to be designed.
    Type: Application
    Filed: August 12, 2011
    Publication date: December 1, 2011
    Applicant: PANASONIC CORPORATION
    Inventor: Masakazu TANAKA
  • Patent number: 8023869
    Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.
    Type: Grant
    Filed: October 16, 2009
    Date of Patent: September 20, 2011
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Yoshihisa Mizumoto, Masakazu Tanaka, Takashi Marui, Hideyuki Okuyama, Noriaki Hitomi
  • Patent number: 7779373
    Abstract: Using layout position information as input, in a position-dependent variation amount calculation step, position-dependent variation amount information which is a variation amount of a characteristic parameter or a shape parameter variable depending on an arrangement position of each element constituting a design target semiconductor integrated circuit is calculated. Thereafter, a simulation is performed using circuit information. In the simulation, a value for the circuit information is corrected according to a position-dependent variation amount of the position-dependent variation amount information, and a result of the simulation is calculated. Accordingly, a simulation for a circuit characteristic using a variation amount depending on an arrangement position of a device and the like can be performed with layout position information for a semiconductor integrated circuit.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: August 17, 2010
    Assignee: Panasonic Corporation
    Inventor: Masakazu Tanaka
  • Publication number: 20100172675
    Abstract: The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.
    Type: Application
    Filed: October 16, 2009
    Publication date: July 8, 2010
    Inventors: Yoshihisa MIZUMOTO, Masakazu Tanaka, Takashi Marui, Hideyuki Okuyama, Noriaki Hitomi
  • Patent number: 7740778
    Abstract: A method of producing a conductive belt composed of a base resin containing polybutylene naphthalate resin at not less than 50 mass % nor more than 100 mass % and 1 to 3 mass % of carbon nano-fibers having a DBP oil absorption amount at not less than 150 ml/100 g. The method includes the steps of forming a conductive master batch by mixing the carbon nano-fibers with resin for use in a master batch containing the polybutylene naphthalate resin; mixing the obtained conductive master batch and resin for blending use containing the polybutylene naphthalate resin and not containing the carbon nano-fibers with each other in an unmelted state by setting a mixing mass ratio of the conductive master batch smaller than that of the resin for blending use; and meltingly molding an obtained mixture by an extrusion molder.
    Type: Grant
    Filed: July 11, 2007
    Date of Patent: June 22, 2010
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventor: Masakazu Tanaka
  • Patent number: 7723263
    Abstract: A ceramic support capable of supporting a catalyst comprising a ceramic body having fine pores with a diameter or width up to 1000 times the ion diameter of a catalyst component to be supported on the surface of the ceramic body, the number of the fine pores being not less than 1×1011 pores per liter, is produced by introducing oxygen vacancies or lattice defects in the cordierite crystal lattice or by applying a thermal shock to form fine cracks.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: May 25, 2010
    Assignees: Nippon Soken, Inc., Denso Corporation
    Inventors: Kazuhiko Koike, Tomohiko Nakanishi, Takeshi Ueda, Masakazu Tanaka
  • Patent number: 7713458
    Abstract: A laminated seamless belt having at least a base layer and an outer layer. The base layer contains a polyester thermoplastic elastomer as its main component. The base layer has a volume resistivity set to not less than 1.0×106(?·cm) nor more than 1.0×1011(?·cm). A volume resistivity of the outer layer is set to not less than 1.0×1011(?·cm) and not less than 10 times as large as that of the base layer. The base layer and the outer layer are formed by laminated extrusion.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: May 11, 2010
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Masakazu Tanaka, Takayuki Hattori
  • Patent number: 7641973
    Abstract: A conductive layer of a conductive member for an image-forming apparatus is composed of a conductive polymer composition containing an ionic-conductive addition salt. The conductive polymer composition has a continuous phase and one or more uncontinuous phases including at least one first uncontinuous phase. The continuous phase and the uncontinuous phase form a sea-island structure. A salt capable of dissociating into cations and anions is unevenly distributed to the first uncontinuous phase. A polymer composing the first uncontinuous phase has a higher degree of affinity for the salt capable of dissociating into cations and anions than a polymer composing the continuous phase to prevent the salt (or the cations, the anions) from shifting out of the first uncontinuous phase or out of the polymer composition. The conductive polymer composition can contain melamine cyanurate so that it is flame-retardant.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: January 5, 2010
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Takayuki Hattori, Kenichi Uesaka, Jun Ochi, Masakazu Tanaka, Katsumi Terakawa, Yogun Ki
  • Patent number: 7358210
    Abstract: A ceramic body that can support a required amount of catalyst component, without lowering the characteristics such as strength, manufactured without forming a coating layer and providing a high performance ceramic catalyst body that is excellent in practical utility and durability. This ceramic body is made by substituting at least one of the constituent elements of cordierite that constitutes the substrate ceramic, for example Al, with W that is the element having an empty orbit in d or f orbit, has high bonding strength and is less susceptible to deterioration since the catalyst component Pt is supported by means of chemical bonding.
    Type: Grant
    Filed: March 22, 2002
    Date of Patent: April 15, 2008
    Assignees: Denso Corporation, Nippon Soken, Inc.
    Inventors: Masakazu Tanaka, Tomomi Hase, Takashi Kondo, Tosiharu Kondo, Hiromi Sano, Jun Hasegawa, Miho Ito, Tomohiko Nakanishi, Kazuhiko Koike, Takumi Suzawa
  • Publication number: 20080066025
    Abstract: A circuit analyzing method of the present invention comprises the steps of (a) applying, for a characteristic having a variation width of characteristics of an element included in a circuit to be analyzed, any one of a maximum value and a minimum value of the variation width as a representative value of the characteristic of the element and (b) estimating a characteristic of the circuit to be analyzed, using the representative value.
    Type: Application
    Filed: August 28, 2007
    Publication date: March 13, 2008
    Inventor: Masakazu Tanaka
  • Publication number: 20080038658
    Abstract: A method of producing a conductive belt composed of a base resin containing polybutylene naphthalate resin at not less than 50 mass % nor more than 100 mass % and 1 to 3 mass % of carbon nano-fibers having a DBP oil absorption amount at not less than 150 ml/100 g. The method includes the steps of forming a conductive master batch by mixing the carbon nano-fibers with resin for use in a master batch containing the polybutylene naphthalate resin; mixing the obtained conductive master batch and resin for blending use containing the polybutylene naphthalate resin and not containing the carbon nano-fibers with each other in an unmelted state by setting a mixing mass ratio of the conductive master batch smaller than that of the resin for blending use; and meltingly molding an obtained mixture by an extrusion molder.
    Type: Application
    Filed: July 11, 2007
    Publication date: February 14, 2008
    Inventor: Masakazu Tanaka
  • Publication number: 20070186196
    Abstract: Using layout position information as input, in a position-dependent variation amount calculation step, position-dependent variation amount information which is a variation amount of a characteristic parameter or a shape parameter variable depending on an arrangement position of each element constituting a design target semiconductor integrated circuit is calculated. Thereafter, a simulation is performed using circuit information. In the simulation, a value for the circuit information is corrected according to a position-dependent variation amount of the position-dependent variation amount information, and a result of the simulation is calculated. Accordingly, a simulation for a circuit characteristic using a variation amount depending on an arrangement position of a device and the like can be performed with layout position information for a semiconductor integrated circuit.
    Type: Application
    Filed: January 9, 2007
    Publication date: August 9, 2007
    Inventor: Masakazu Tanaka
  • Publication number: 20070173403
    Abstract: A ceramic support capable of supporting a catalyst comprising a ceramic body having fine pores with a diameter or width up to 1000 times the ion diameter of a catalyst component to be supported on the surface of the ceramic body, the number of the fine pores being not less than 1×1011 pores per liter, is produced by introducing oxygen vacancies or lattice defects in the cordierite crystal lattice or by applying a thermal shock to form fine cracks.
    Type: Application
    Filed: December 20, 2006
    Publication date: July 26, 2007
    Applicants: Nippon Soken, Inc., Denso Corporation
    Inventors: Kazuhiko Koike, Tomohiko Nakanishi, Takeshi Ueda, Masakazu Tanaka
  • Patent number: 7223716
    Abstract: A ceramic support capable of supporting a catalyst comprising a ceramic body having fine pores with a diameter or width up to 1000 times the ion diameter of a catalyst component to be supported on the surface of the ceramic body, the number of the fine pores being not less than 1×1011 pores per liter, is produced by introducing oxygen vacancies or lattice defects in the cordierite crystal lattice or by applying a thermal shock to form fine cracks.
    Type: Grant
    Filed: April 10, 2000
    Date of Patent: May 29, 2007
    Assignees: Nippon Soken, Inc., Denso Corporation
    Inventors: Kazuhiko Koike, Tomohiko Nakanishi, Takeshi Ueda, Masakazu Tanaka
  • Publication number: 20070062635
    Abstract: A laminated seamless belt having at least a base layer and an outer layer. The base layer contains a polyester thermoplastic elastomer as its main component. The base layer has a volume resistivity set to not less than 1.0×106(?·cm) nor more than 1.0×1011(?·cm). A volume resistivity of the outer layer is set to not less than 1.0×1011(?·cm) and not less than 10 times as large as that of the base layer. The base layer and the outer layer are formed by laminated extrusion.
    Type: Application
    Filed: November 17, 2006
    Publication date: March 22, 2007
    Inventors: Masakazu Tanaka, Takayuki Hattori
  • Publication number: 20070033554
    Abstract: Delay distribution in an integrated circuit is calculated while taking into account a correlation of performance between interconnects or elements in the integrated circuit, thereby improving estimation accuracy. Circuit information, performance distribution information of the interconnects or elements in the integrated circuit, and correlation information of performance between the interconnects or elements are input. A vertex is selected for calculation, and a correlation between delay distribution at the selected vertex and delay distribution in a partial circuit including the selected vertex is calculated based on the performance distribution information and the correlation information.
    Type: Application
    Filed: October 5, 2006
    Publication date: February 8, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shuji Tsukiyama, Masakazu Tanaka, Masahiro Fukui
  • Patent number: 7153897
    Abstract: A flame-retardant seamless belt is formed by molding a thermoplastic composition containing a polyester thermoplastic elastomer as a main component thereof; at not less than 15 wt % nor more than 40 wt % of melamine cyanurate for a whole weight of the thermoplastic composition; and not less than 0.01 parts by weight nor more than three parts by weight of an anion-containing salt, shown by a chemical formula 1, for 100 parts by weight of an entire polymer component. The thermoplastic composition has a volume resistivity of not less than 1.0×106?·cm nor more than 1.0×1012?·cm. The flame-retardant seamless belt is used as an intermediate transfer belt (33) or the like for use in an image-forming apparatus such as a copying apparatus, a facsimile, a printer, and the like.
    Type: Grant
    Filed: January 2, 2004
    Date of Patent: December 26, 2006
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Masakazu Tanaka, Takayuki Hattori
  • Patent number: 7150908
    Abstract: A conductive belt having a base layer (3) electroconductive and made of a resin, an intermediate layer (5) ionic-conductive and made of an elastomer, and a surface coating layer (7). The base layer (3) has a tensile modulus of elasticity of not less than 500 Mpa and a volume electric resistance value not less than 106 ?·cm nor more than 1011 ?·cm. The intermediate layer (5) has a JIS A hardness less than 70, a thickness not less than 50 ?m nor more than 600 ?m, and a volume electric resistance value not less than 108 ?·cm nor more than 1014 ?·cm.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: December 19, 2006
    Assignee: Sumitomo Rubber Industries, Ltd
    Inventors: Katsumi Terakawa, Shunichi Yabushita, Masakazu Tanaka, Jun Ochi
  • Patent number: 7144621
    Abstract: A laminated seamless belt having at least a base layer and an outer layer. The base layer contains a polyester thermoplastic elastomer as its main component. The base layer has a volume resistivity set to not less than 1.0×106(?·cm) nor more than 1.0×1011(?·cm). A volume resistivity of the outer layer is set to not less than 1.0×1011(?·cm) and not less than 10 times as large as that of the base layer. The base layer and the outer layer are formed by laminated extrusion.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: December 5, 2006
    Assignee: Sumitomo Rubber Industries, Ltd.
    Inventors: Masakazu Tanaka, Takayuki Hattori
  • Patent number: 7131082
    Abstract: Delay distribution in an integrated circuit is calculated while taking into account a correlation of performance between interconnects or elements in the integrated circuit, thereby improving estimation accuracy. Circuit information, performance distribution information of the interconnects or elements in the integrated circuit, and correlation information of performance between the interconnects or elements are input. A vertex is selected for calculation, and a correlation between delay distribution at the selected vertex and delay distribution in a partial circuit including the selected vertex is calculated based on the performance distribution information and the correlation information.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: October 31, 2006
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shuji Tsukiyama, Masakazu Tanaka, Masahiro Fukui