Patents by Inventor John D. Early

John D. Early 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).

  • Ceramic furnace door and frame
    Patent number: 4429641
    Abstract: A cast ceramic hearth door and frame which provides a one-piece ceramic frame with provisions for a door to be slideably disposed within the one-piece frame.
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: February 7, 1984
    Assignee: Bethlehem Steel Corporation
    Inventor: John D. Early