Patents by Inventor David L. Ashworth

David L. Ashworth 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).

  • Manufactured granular substrate and method for producing the same
    Patent number: 6231660
    Abstract: A manufactured granular substrate composition suitable for use as a carrier for active chemical agents. The composition includes about 65 wt % or more of one or more mineral components having a bulk density greater than about 70 pounds per cubic foot. The composition also contains about 5 wt % to about 25 wt % of one or more light weight additives and up to 20 wt % of one or more water soluble binders. The resulting manufactured granular substrate is readily dispersable in water and has a bulk density of less than about 55 pounds per cubic foot with a size guide number of about 100 to about 230.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: May 15, 2001
    Assignees: The National Lime and Stone Co., The Andersons, Inc.
    Inventors: James W. Welshimer, David L. Ashworth, Peter V. Cawlfield, Nadine C. Dunn, Gerald L. Gingrich, Karissa L. Fox, Kim W. Venable, Paul Weinstein, Timothy D. Birthisel