Patents by Inventor Paul Sillem

Paul Sillem 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).

  • Pile-driving ram
    Patent number: 4427078
    Abstract: A ram for driving elongated objects into the ground including a piston jacket, an anvil disposed on the object to be driven, a mechanism located within the jacket for directly impacting with the anvil and for reciprocating at least substantially in a direction of driving the elongated object during driving operation wherein the mechanism for impacting further includes a plurality of cup springs arranged in series in the direction of driving the object and which are in contact with one another and wherein a lowermost cup spring directly impacts the anvil during driving operation.
    Type: Grant
    Filed: April 8, 1981
    Date of Patent: January 24, 1984
    Assignee: De Rotterdamsche Droogdok MIJ B.V.
    Inventors: Henk R. Wolters, Paul Sillem