Patents by Inventor Michael L. Portass

Michael L. Portass 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).

  • Tensioning of members
    Patent number: 4213720
    Abstract: A plurality of members such as riser pipes are linked by means of a plurality of cylinders to a frame to which tension is to be applied. Each member is linked to the frame by a separate cylinder and the cylinders are interconnected so that the hydraulic fluid pressures in the cylinders are in a fixed proportion relative to one another.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: July 22, 1980
    Assignee: Vickers Limited
    Inventor: Michael L. Portass