Patents by Inventor Hidetoshi Juryozawa

Hidetoshi Juryozawa 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).

  • Carburization treatment method
    Patent number: 7575643
    Abstract: The invention provides a carburization treatment method in which the carburization treatment is conducted under a condition where an atmosphere within the furnace is maintained at a high carbon potential which is slightly blow a carbon solid solubility. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4, C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: August 18, 2009
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Hisashi Ebihara, Jun Takahashi, Fumitaka Abukawa, Keiji Yokose, Hidetoshi Juryozawa
  • Carburization treatment method and carburization treatment apparatus
    Publication number: 20080073002
    Abstract: The invention provides a carburization treatment method in which a carburization treatment is conducted simultaneously with an operation of supplying a hydrocarbon gas and an oxidative gas into a furnace kept under a reduced pressure. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4, C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Application
    Filed: September 10, 2007
    Publication date: March 27, 2008
    Applicant: DOWA THERMOTECH CO., LTD.
    Inventors: Fumitaka Abukawa, Hisashi Ebihara, Hidetoshi Juryozawa, Jun Takahashi, Keiji Yokose
  • Carburization treatment method and carburization treatment apparatus
    Patent number: 7276204
    Abstract: The invention provides a carburization treatment method in which a carburization treatment is conducted simultaneously with an operation of supplying a hydrocarbon gas and an oxidative gas into a furnace kept under a reduced pressure. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4, C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: October 2, 2007
    Assignee: Dowa Thermotech Co., Ltd.
    Inventors: Hisashi Ebihara, Jun Takahashi, Fumitaka Abukawa, Keiji Yokose, Hidetoshi Juryozawa
  • Vacuum heat treatment furnace and method of and apparatus for measuring carbon concentration in atmosphere having reduced pressure.
    Patent number: 7024916
    Abstract: A vacuum heat treatment furnace comprising a furnace shell, a casing arranged in an inner side of the furnace shell, a heat insulating layer consisting of a thick plate-like alumina-silica series ceramic fiber blanket and a thin plate-like alumina series ceramic material arranged in an inside of the casing, and a heater arranged in a heating room surrounded by the heat insulating layer.
    Type: Grant
    Filed: January 16, 2004
    Date of Patent: April 11, 2006
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Hidetoshi Juryozawa, Keiji Yokose, Fumitaka Abukawa, Jun Takahashi, Hisashi Ebihara
  • Vacuum heat treatment furnace and method of and apparatus for measuring carbon concentration in atmosphere having reduced pressure
    Publication number: 20040149006
    Abstract: A vacuum heat treatment furnace comprising a furnace shell, a casing arranged in an inner side of the furnace shell, a heat insulating layer consisting of a thick plate-like alumina-silica series ceramic fiber blanket and a thin plate-like alumina series ceramic material arranged in an inside of the casing, and a heater arranged in a heating room surrounded by the heat insulating layer.
    Type: Application
    Filed: January 16, 2004
    Publication date: August 5, 2004
    Applicant: Dowa Mining Co., Ltd.
    Inventors: Hidetoshi Juryozawa, Keiji Yokose, Fumitaka Abukawa, Jun Takahashi, Hisashi Ebihara
  • Vacuum heat treatment furnace
    Patent number: 6709629
    Abstract: A vacuum heat treatment furnace comprising a furnace shell, a casing arranged in an inner side of the furnace shell, a heat insulating layer consisting of a thick plate-like alumina-silica series ceramic fiber blanket and a thin plate-like alumina series ceramic material arranged in an inside of the casing, and a heater arranged in a heating room surrounded by the heat insulating layer.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: March 23, 2004
    Assignee: Dowa Mining Co., Ltd.
    Inventors: Hidetoshi Juryozawa, Keiji Yokose, Fumitaka Abukawa, Jun Takahashi, Hisashi Ebihara
  • Vacuum heat treatment furnace and method of and apparatus for measuring carbon concentration in atmosphere having reduced pressure
    Publication number: 20020189322
    Abstract: A vacuum heat treatment furnace comprising a furnace shell, a casing arranged in an inner side of the furnace shell, a heat insulating layer consisting of a thick plate-like alumina-silica series ceramic fiber blanket and a thin plate-like alumina series ceramic material arranged in an inside of the casing, and a heater arranged in a heating room surrounded by the heat insulating layer.
    Type: Application
    Filed: March 28, 2002
    Publication date: December 19, 2002
    Applicant: Dowa Mining Co., Ltd.
    Inventors: Hidetoshi Juryozawa, Keiji Yokose, Fumitaka Abukawa, Jun Takahashi, Hisashi Ebihara
  • Carburization treatment method and carburization treatment apparatus
    Publication number: 20020179187
    Abstract: The invention provides a carburization treatment method in which a carburization treatment is conducted simultaneously with an operation of supplying a hydrocarbon gas and an oxidative gas into a furnace kept under a reduced pressure. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4/C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Application
    Filed: March 28, 2002
    Publication date: December 5, 2002
    Inventors: Hisashi Ebihara, Jun Takahashi, Fumitaka Abukawa, Keiji Yokose, Hidetoshi Juryozawa
  • Carburization treatment method and carburization treatment apparatus
    Publication number: 20020179186
    Abstract: The invention provides a carburization treatment method in which the carburization treatment is conducted under a condition where an atmosphere within the furnace is maintained at a high carbon potential which is slightly blow a carbon solid solubility. Preferably, the internal pressure within the furnace is kept at 0.1 to 101 kPa, the hydrocarbon gas is one, two or more than two kinds of gases selected from the group consisting of C3H8, C3H6, C4H10, C2H2, C2H4, C2H6 and CH4, while the oxidative gas is an air, an O2 gas, or CO2 gas.
    Type: Application
    Filed: March 28, 2002
    Publication date: December 5, 2002
    Inventors: Hisashi Ebihara, Jun Takahashi, Fumitaka Abukawa, Keiji Yokose, Hidetoshi Juryozawa