Patents by Inventor Anthony J. R. Hart

Anthony J. R. Hart 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).

  • Tunnel lining rings
    Patent number: 4452549
    Abstract: The disclosure relates to a tunnel lining ring made up of a plurality of pre-cast arcuate concrete tunnel lining segments (10,11). The segments providing the lower part of the ring are formed with a recess (17) around the inner surface thereof to receive a secondary lining (18) in the completed tunnel to enable the inner surface of the invert of the tunnel to be graded as required and hence eliminate irregularities caused during the construction of the tunnel.
    Type: Grant
    Filed: March 10, 1982
    Date of Patent: June 5, 1984
    Assignee: Charcon Tunnels Limited
    Inventor: Anthony J. R. Hart