Patents by Inventor David Hetman

David Hetman 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).

  • Small animal litter material manufacturing method
    Patent number: 5964188
    Abstract: A method of producing cat litter is disclosed including the steps of shredding sheets of paper to generate strips, filling a water permeable bag with the strips, saturating the bag and strips therein with water while simultaneously decomposing the strips by way of agitation, and drying the bag with the strips therein for a predetermined amount of time until the strips are dry.
    Type: Grant
    Filed: November 13, 1997
    Date of Patent: October 12, 1999
    Inventor: David Hetman