Patents by Inventor William Isaac Hoffman

William Isaac Hoffman 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).

  • High strength SiC filter and method for the manufacture thereof
    Patent number: 6663776
    Abstract: There is provided an improved ceramic foam filter for use in filtering molten metals, metal prepared from a ceramic slurry containing silicon carbide, a colloidal silica binder and at least 10 percent of fumed silica. The filter has enhanced strength properties.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: December 16, 2003
    Assignee: Selee Corporation
    Inventors: William Isaac Hoffman, Rudolph A. Olson, III
  • High strength SiC filter and method for the manufacture thereof
    Publication number: 20030062303
    Abstract: There is provided an improved ceramic foam filter for use in filtering molten metals, metal prepared from a ceramic slurry containing silicon carbide, a colloidal silica binder and at least 10 percent of fumed silica. The filter has enhanced strength properties.
    Type: Application
    Filed: September 27, 2002
    Publication date: April 3, 2003
    Inventors: William Isaac Hoffman, Rudolf A. Olson