Patents by Inventor Susan L. LeVan

Susan L. LeVan 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).

  • One step process for imparting decay resistance and fire retardancy to wood products
    Patent number: 5185214
    Abstract: A one step process for imparting both decay resistance and fire retardancy to wood and cellulosic materials by impregnating the products with a treatment solution composed of a water soluble mixture of a tertiary and quaternary ammonium preservative compound and an organic phosphate fire retardant compound.
    Type: Grant
    Filed: June 12, 1991
    Date of Patent: February 9, 1993
    Inventors: Susan L. LeVan, Rodney C. DeGroot