Patents by Inventor Madhusudan Raghavan

Madhusudan Raghavan 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).

  • 8-speed transmission
    Patent number: 7811198
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of two to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: October 12, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Scott H. Wittkopp, James M. Hart, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7811197
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting mechanisms, two fixed interconnections and two grounded members. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The five torque-transmitting mechanisms provide interconnections between various gear members, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: October 12, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission with two fixed interconnections
    Patent number: 7811196
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting devices and two fixed interconnections. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and with the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: October 12, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: James M. Hart, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7798934
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting devices, three fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The five torque-transmitting devices provide interconnections between various gear members, and with the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: September 21, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: James M. Hart, Andrew W. Phillips, Clinton E. Carey, Scott H. Wittkopp, Madhusudan Raghavan
  • 8-speed transmissions
    Patent number: 7798936
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets having six torque-transmitting mechanisms, one fixed interconnection and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: July 20, 2007
    Date of Patent: September 21, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Clinton E. Carey, James M. Hart, Andrew W. Phillips, Scott H. Wittkopp, Madhusudan Raghavan
  • Eight speed automatic transmission
    Patent number: 7789791
    Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may be either clutches or brakes.
    Type: Grant
    Filed: March 12, 2008
    Date of Patent: September 7, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
  • Multi-speed transmission
    Patent number: 7785226
    Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.
    Type: Grant
    Filed: August 7, 2007
    Date of Patent: August 31, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, Clinton E. Carey, James M. Hart, Scott H. Wittkopp, Madhusudan Raghavan
  • 8-speed transmissions
    Patent number: 7785227
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, one fixed interconnection and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: August 31, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Scott H. Wittkopp, Clinton E. Carey, James M. Hart, Andrew W. Phillips, Madhusudan Raghavan
  • Eight speed automatic transmission
    Patent number: 7785225
    Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and a brake.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: August 31, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
  • MULTI-SPEED TRANSMISSION
    Publication number: 20100197442
    Abstract: A transmission is disclosed having an input member, an output member, a plurality of planetary gear sets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. The plurality of planetary gear sets has first, second and third members. The input member is continuously interconnected with a member of the planetary gear sets. The output member is continuously interconnected with another member of the planetary gear sets. At least eight forward speeds and one reverse speed are produced by the selective engagement of the five torque-transmitting mechanisms.
    Type: Application
    Filed: March 1, 2010
    Publication date: August 5, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: James M. Hart, James B. Borgerson, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • MULTI-SPEED TRANSMISSION
    Publication number: 20100197443
    Abstract: A transmission is disclosed having an input member, an output member, a plurality of planetary gear sets, a plurality of interconnecting members and a plurality of torque-transmitting mechanisms. The plurality of planetary gear sets has first, second and third members. The input member is continuously interconnected with a member of the planetary gear sets. The output member is continuously interconnected with another member of the planetary gear sets. At least eight forward speeds and one reverse speed are produced by the selective engagement of the five torque-transmitting mechanisms.
    Type: Application
    Filed: March 1, 2010
    Publication date: August 5, 2010
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventors: James M. Hart, James B. Borgerson, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7766782
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, two fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of two to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: August 16, 2007
    Date of Patent: August 3, 2010
    Assignee: GM Global Technology Operation, Inc.
    Inventors: Scott H. Wittkopp, James M. Hart, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7766783
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting mechanisms, three fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting mechanisms provide interconnections between various gear members, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: August 3, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, James M. Hart, Madhusudan Raghavan
  • Eight speed automatic transmission
    Patent number: 7766784
    Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and a brake.
    Type: Grant
    Filed: February 18, 2008
    Date of Patent: August 3, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: James M. Hart, Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, Madhusudan Raghavan
  • Multi-speed transmission
    Patent number: 7758464
    Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: July 20, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, James M. Hart, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
  • Eight speed automatic transmission
    Patent number: 7753819
    Abstract: An automatic transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.
    Type: Grant
    Filed: March 10, 2008
    Date of Patent: July 13, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Andrew W. Phillips, Scott H. Wittkopp, James M. Hart, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7749126
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque transmitting devices, three fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The five torque transmitting devices provide interconnections between various gear members, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: July 6, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: James M. Hart, Andrew W. Phillips, Scott H. Wittkopp, Clinton E. Carey, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7749129
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes four planetary gear sets having five torque-transmitting mechanisms, three fixed interconnections and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to at least one of the planetary gear members, and an output member that is continuously connected with another one of the planetary gear members. The five torque-transmitting mechanisms provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish at least eight forward speed ratios and at least one reverse speed ratio.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: July 6, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Scott H. Wittkopp, Andrew W. Phillips, Clinton E. Carey, James M. Hart, Madhusudan Raghavan
  • Multi-speed transmission
    Patent number: 7736260
    Abstract: A transmission is provided having an input member, an output member, four planetary gear sets, a plurality of coupling members and a plurality of torque transmitting devices. Each of the planetary gear sets includes first, second and third members. The torque transmitting devices may include clutches and brakes.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: June 15, 2010
    Assignee: GM Global Technology Operations Inc.
    Inventors: James M. Hart, Clinton E. Carey, Andrew W. Phillips, Scott H. Wittkopp, Madhusudan Raghavan
  • 8-speed transmission
    Patent number: 7736258
    Abstract: The transmission has a plurality of members that can be utilized in powertrains to provide eight forward speed ratios and one reverse speed ratio. The transmission includes three planetary gear sets, six torque-transmitting devices, one fixed interconnection and a grounded member. The powertrain includes an engine and torque converter that is continuously connected to one of the planetary gear members and an output member that is continuously connected with another one of the planetary gear members. The six torque-transmitting devices provide interconnections between various gear members, and the transmission housing, and are operated in combinations of three to establish eight forward speed ratios and one reverse speed ratio.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: June 15, 2010
    Assignee: GM Global Technology Operations, Inc.
    Inventors: Scott H. Wittkopp, Andrew W. Phillips, James M. Hart, Clinton E. Carey, Madhusudan Raghavan