Patents by Inventor Ellen Jean Hoffman

Ellen Jean Hoffman 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).

  • Dynamic control system for continuously variable transmission
    Patent number: 8352138
    Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has a first operator input device configured to transmit a first displacement signal corresponding to a displacement of the first operator input device. The continuously variable transmission further has a second operator input device configured to transmit a second displacement signal corresponding to a displacement of the second operator input device. In addition, the continuously variable transmission has a third operator input device configured to transmit a transmission operating mode request. Furthermore, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission.
    Type: Grant
    Filed: November 30, 2007
    Date of Patent: January 8, 2013
    Assignee: Caterpillar Inc.
    Inventors: Kristofor Lee Dahl, Richard George Ingram, Michael Anthony Spielman, Jr., Alberto Martinez, Jr., Yaang Zhao, Ellen Jean Hoffman
  • Dynamic control system for continuously variable transmission
    Publication number: 20090143948
    Abstract: A continuously variable transmission is provided having a driven element. The continuously variable transmission also has a first operator input device configured to transmit a first displacement signal corresponding to a displacement of the first operator input device. The continuously variable transmission further has a second operator input device configured to transmit a second displacement signal corresponding to a displacement of the second operator input device. In addition, the continuously variable transmission has a third operator input device configured to transmit a transmission operating mode request. Furthermore, the continuously variable transmission has at least one sensor configured to sense at least one parameter indicative of an operating condition of the transmission.
    Type: Application
    Filed: November 30, 2007
    Publication date: June 4, 2009
    Inventors: Kristofor Lee Dahl, Richard George Ingram, Michael Anthony Spielman, JR., Alberto Martinez, JR., Yaang Zhao, Ellen Jean Hoffman