Patents by Inventor Jonathan J. Parkinson

Jonathan J. Parkinson 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).

  • Methods of laying underground conduits
    Patent number: 4329083
    Abstract: The invention relates to a method of laying underground conduits along a trench dug into the ground and filled with sludge designed to prevent the trench walls from collapsing.The trench is at least partly lined with hardenable grout and the conduit laying operations are carried out under the protection of this grout so that, after the same has hardened, it seals the conduit into the ground.
    Type: Grant
    Filed: November 5, 1979
    Date of Patent: May 11, 1982
    Assignee: Societe Soletanche
    Inventor: Jonathan J. Parkinson