Patents by Inventor Michael Jon Grichnik

Michael Jon Grichnik 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).

  • Hydrostatic drive system with variable charge pump
    Publication number: 20080238187
    Abstract: A hydraulic system is provided having a reservoir configured to hold a supply of fluid. The hydraulic system also has a variable displacement pump configured to supply charge fluid and pilot control fluid to the hydraulic system. In addition, the hydraulic system has a closed-loop portion configured to receive charge fluid from the variable displacement pump and drive a mechanism. The hydraulic system further has a pilot fluid supply portion configured to direct pilot control fluid from the variable displacement pump to closed-loop portion.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Inventors: Stephen Carl Garnett, Michael Jon Grichnik, Randall Alan Harlow, David Jason McIntyre, Eric David Stemler, Timothy Lynn Hand, Adam Hendzel, Ryan Raymond Harken, Nathanael Garnet McRostie