Patents by Inventor Robert Vernon Wiedenhaft

Robert Vernon Wiedenhaft 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).

  • Clumping cellulosic animal litter
    Patent number: 5970916
    Abstract: Clumping cellulosic animal litter comprising a cellulosic substrate coated with a first layer of xanthan gum and a second layer of guar gum and a unique method of making such particles by applying water coatings between application of the two gum layers.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: October 26, 1999
    Assignee: Thermo Fibergen, Inc.
    Inventors: Ricky Lee Yoder, Robert Vernon Wiedenhaft