Patents by Inventor Donald William Ertmer

Donald William Ertmer 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).

  • Electronic engine speed control system for grass mowing machine
    Patent number: 7669580
    Abstract: An electronic engine speed control system for a grass mowing machine powered by an internal combustion engine includes a microcontroller providing an output signal to an engine speed actuator for the engine, a pedal position sensor connected to a foot pedal and providing a voltage input signal to the microcontroller based on the position of the foot pedal, a PTO clutch switch providing a signal input to the microcontroller indicating if a PTO clutch is engaged, and a lever position sensor connected to a hand lever and having a range of positions including an Automatic mode position and a plurality of Manual mode positions.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: March 2, 2010
    Assignee: Deere & Company
    Inventors: Carl Steven Silbernagel, John Boyd Kuhn, Harlin J. Trefz, Donald William Ertmer
  • ELECTRONIC ENGINE SPEED CONTROL SYSTEM FOR GRASS MOWING MACHINE
    Publication number: 20090235627
    Abstract: An electronic engine speed control system for a grass mowing machine powered by an internal combustion engine includes a microcontroller providing an output signal to an engine speed actuator for the engine, a pedal position sensor connected to a foot pedal and providing a voltage input signal to the microcontroller based on the position of the foot pedal, a PTO clutch switch providing a signal input to the microcontroller indicating if a PTO clutch is engaged, and a lever position sensor connected to a hand lever and having a range of positions including an Automatic mode position and a plurality of Manual mode positions.
    Type: Application
    Filed: March 24, 2008
    Publication date: September 24, 2009
    Inventors: Carl Steven Silbernagel, John Boyd Kuhn, Harlin J. Trefz, Donald William Ertmer