Patents by Inventor William F. Schiavi

William F. Schiavi 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).

  • Refractory composition
    Patent number: 4971934
    Abstract: A refractory brick for use in rotary cement kilns has improved properties by the addition of small quantities of MnO.sub.2 to the composition used to form the brick.
    Type: Grant
    Filed: August 23, 1989
    Date of Patent: November 20, 1990
    Assignee: North American Refractories Company
    Inventors: William F. Schiavi, Robert H. Herron