Patents by Inventor Michael D. Wetzel

Michael D. Wetzel 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).

  • Variable pilot pressure control for pilot valves
    Patent number: 6305419
    Abstract: A hydraulically operated industrial machine has hydraulic work components such as a boom, bucket or the like, and also uses hydraulic motors for propelling the machine. The motors and cylinders are controlled by pilot pressure valves to provide pressure to pilot operated valves. A pressure reducing valve is utilized for providing hydraulic fluid at a pilot pressure to the pilot valves. The reducing valve regulates the pilot pressure as a function of one or more parameters indicating the consumption of hydraulic power in the system, such as drive engine speed, or other signals including oil temperature, throttle position, and, if desired, feedback signals from the system.
    Type: Grant
    Filed: July 14, 2000
    Date of Patent: October 23, 2001
    Assignee: Clark Equipment Company
    Inventors: Daniel J. Krieger, Michael D. Wetzel
  • Mini-excavator cab exterior
    Patent number: D481044
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: October 21, 2003
    Assignee: Clark Equipment Company
    Inventors: Thomas J. Tokach, Michael D. Wetzel, Henry J. Weber, Troy D. Kraft
  • Mini-excavator canopy
    Patent number: D481398
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: October 28, 2003
    Assignee: Clark Equipment Company
    Inventors: Thomas J. Tokach, Michael D. Wetzel, David W. Graf, Henry J. Weber
  • Mini-excavator canopy
    Patent number: D487100
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: February 24, 2004
    Assignee: Clark Equipment Company
    Inventors: Thomas J. Tokach, Michael D. Wetzel, David W. Graf, Henry J. Weber
  • Mini-excavator body exterior
    Patent number: D487575
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: March 16, 2004
    Assignee: Clark Equipment Company
    Inventors: Michael D. Wetzel, Henry J. Weber, Jeremy A. Harms