Patents by Inventor Keith Annett

Keith Annett 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).

  • Blocks of refractory concrete
    Patent number: 4086740
    Abstract: Refractory concrete blocks e.g. furnace wall lining blocks, have a through hole for attachment of the block to a support by a bolt. The hole has a narrow portion next the support and a wider portion more remote therefrom having a keying configuration so refractory paste inserted after installation to protect the bolt head does not drop out in use.
    Type: Grant
    Filed: October 12, 1976
    Date of Patent: May 2, 1978
    Assignee: Foseco Trading A.G.
    Inventor: Keith Annett