Patents by Inventor John W. T. Ropkins

John W. T. Ropkins 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).

  • Forming a passageway through the ground
    Patent number: 5129760
    Abstract: A method of forming a passageway (P) through the ground by inserting into the ground a structure (1) comprising a superstructure (3) and a substructure (2). The superstructure (3) is inserted into position in the ground, and the substructure (2) is urged into the ground beneath the superstructure (3), the ground being excavated as the substructure is inserted so as to form the passageway (P) bounded by the superstructure and the substructure.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: July 14, 1992
    Assignee: AEB Jacked Structures Limited
    Inventor: John W. T. Ropkins