Patents by Inventor Takehiro Akizawa

Takehiro Akizawa 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).

  • Scroll compressor having a valved back pressure chamber and a bypass for overcompression
    Patent number: 7354259
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: April 8, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor
    Patent number: 7137796
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: November 21, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor having a back-pressure chamber control valve
    Patent number: 7118358
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Grant
    Filed: November 4, 2005
    Date of Patent: October 10, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor
    Publication number: 20060057010
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Application
    Filed: November 4, 2005
    Publication date: March 16, 2006
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor
    Publication number: 20060051226
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Application
    Filed: November 4, 2005
    Publication date: March 9, 2006
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor
    Publication number: 20040247476
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Application
    Filed: July 9, 2004
    Publication date: December 9, 2004
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor having a valved back pressure chamber and a bypass for overcompression
    Patent number: 6769888
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Grant
    Filed: April 21, 2003
    Date of Patent: August 3, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor
    Publication number: 20030190247
    Abstract: There is provided a scroll compressor having high overall adiabatic efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Application
    Filed: April 21, 2003
    Publication date: October 9, 2003
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa
  • Scroll compressor having a valved back-pressure chamber and a bypass for over-compression
    Patent number: 6589035
    Abstract: There is provided a scroll compressor having high overall efficiency and reliability in a wide pressure operating range. A backside excess-suction-pressure region is provided such that pressure higher than suction pressure by a constant value is applied to a backside of scroll members to produce an attractive force to attract both scroll members. A control bypass is also provided for communicating compression chambers with a discharge system only when pressure in the compression chambers is high.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: July 8, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Isamu Tsubono, Masahiro Takebayashi, Isao Hayase, Koichi Inaba, Koichi Sekiguchi, Kenichi Oshima, Atsushi Shimada, Takehiro Akizawa