Patents by Inventor Norman Scheffer

Norman Scheffer 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).

  • Insulating material containing pitch based graphite fiber
    Patent number: 5073199
    Abstract: An asbestos-free insulating material suitable for use in molten metal casting is disclosed. The material is made from a mixture comprising lime, siliceous component, wollastonite, inorganic fiber and pitch based graphite fiber. The mixture is mixed with water to form a slurry, shaped, heated in the presence of steam, and dried to remove free water.
    Type: Grant
    Filed: November 27, 1990
    Date of Patent: December 17, 1991
    Assignee: BNZ Materials, Inc.
    Inventors: Thomas R. Krowl, Norman Scheffer