Patents by Inventor Robert V. Wiedenhaft

Robert V. 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).

  • Method of making clumping cellulosic animal litter
    Patent number: 9301492
    Abstract: A method of making a clumping cellulosic animal litter with enhanced clumping rate and improved flushability when spent using cellulosic granules to about 1%-5% by weight of an inner coating of a polyacrylate is first applied and then to which about 1%-4% by weight based on the weight of the granules of an outer coating of guar gum and/or guar gum substitute is applied.
    Type: Grant
    Filed: March 11, 2014
    Date of Patent: April 5, 2016
    Assignee: KADANT GRANTEK INC.
    Inventors: Ricky L. Yoder, Robert V. Wiedenhaft
  • Clumping cellulosic animal litter
    Patent number: 6662749
    Abstract: Clumping cellulosic animal litter comprising a cellulosic substrate coated with a first coating of a dual adhesive and surface active agent, and a second coating of guar gum, and the method of making such particles.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: December 16, 2003
    Assignee: Kadant Fibergen, Inc.
    Inventors: Robert V. Wiedenhaft, Rick L. Yoder