Patents by Inventor Russell D. Currie

Russell D. Currie 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).

  • Lining or relining of tunnels
    Patent number: 4347018
    Abstract: A method of lining or relining a tunnel comprises the steps of deforming a collar for insertion into the tunnel, reforming the collar to locate it in the tunnel, overlapping the edges of a pipe having a single longitudinal split to reduce its cross-sectional area for insertion into the tunnel, re-aligning the edges and expanding the pipe in the tunnel for engagement with the sleeve, and securing the edges together to retain the pipe in its expanded form.
    Type: Grant
    Filed: August 5, 1980
    Date of Patent: August 31, 1982
    Assignees: Johnston Construction Limited, Johnston Pipes Limited
    Inventors: Noel T. Wrightson, Russell D. Currie