Patents by Inventor Robert J. Erdbrink

Robert J. Erdbrink 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).

  • Semi-submersible crane vessel
    Patent number: 4898288
    Abstract: A semi-submersible crane vessel has a chamber (3) which is open to the sea at the bottom. A piston (4) is movable up and down in the chamber by means of hydraulic jacks (5 and 6) acting on piston rod (7). The part (10) of the chamber above the piston contains air, which may be pressurized via air valve (13) to balance the pressure on both sides of the piston. To stabilize the vessel during movement of a load on the crane (2), the piston is moved in the chamber. This alters the underwater volume of the vessel and therefore its buoyancy.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: February 6, 1990
    Assignee: Heerema Engineering Service BV
    Inventor: Robert J. Erdbrink