Patents by Inventor Donald W. Ertmer

Donald W. 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).

  • Patent number: 11808347
    Abstract: An automatic park lock for an off road or recreational utility vehicle includes a shift interlock solenoid with a spring biased plunger engaging and locking an operator shift lever in the park position. A cam surface on the operator shift lever slopes between a first end and a second end, and has a groove to lock the plunger to the park position. A controller energizes the shift interlock solenoid to retract the plunger when a plurality of operating parameters are satisfied.
    Type: Grant
    Filed: August 31, 2021
    Date of Patent: November 7, 2023
    Assignee: DEERE & COMPANY
    Inventors: Stephan R. Hayden, Donald W. Ertmer, Nathan L. Yolitz
  • Publication number: 20230066305
    Abstract: An automatic park lock for an off road or recreational utility vehicle includes a shift interlock solenoid with a spring biased plunger engaging and locking an operator shift lever in the park position. A cam surface on the operator shift lever slopes between a first end and a second end, and has a groove to lock the plunger to the park position. A controller energizes the shift interlock solenoid to retract the plunger when a plurality of operating parameters are satisfied.
    Type: Application
    Filed: August 31, 2021
    Publication date: March 2, 2023
    Inventors: Stephan R. Hayden, Donald W. Ertmer, Nathan L. Yolitz
  • Patent number: 5291175
    Abstract: A chip resistor whose resistive element provides a power density of at least 20 watts per square inch is provided with an air gap between the resistance element and the electrical contact junctions of the conductive strips electrically connected to the resistance element and terminals attached to the chip resistor. The air gap has a length approximately 70% of the distance between opposing edges of the planar body forming the chip to so restrict heat flow as to prevent the electrical contact junctions from exceeding a temperature of about 175.degree. C. when the resistive element is at a temperature of 350.degree. C. or more.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: March 1, 1994
    Assignee: Ohmite Manufacturing Co.
    Inventors: Donald W. Ertmer, Lawrence D. Gleason, Louis E. Roberts