Patents by Inventor Piet Kalkman

Piet Kalkman 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).

  • Patent number: 6439445
    Abstract: A tensioner, for clamping cables, flexible pipes or bars and moving them forwards in a controlled manner, includes at least two conveyors, each intended to displace one or more clamping members. The conveyors each attached to a main frame element. A selective number of the conveyors can be combined using standard connection elements.
    Type: Grant
    Filed: December 30, 1999
    Date of Patent: August 27, 2002
    Assignee: Itrec B.V.
    Inventors: Anne Klaas De Groot, Piet Kalkman
  • Patent number: 6024184
    Abstract: A transport vehicle for large, heavy loads includes a number of modules coupled one behind the other, each with a loading platform which can be moved by sets of wheels and a drive for conveying the transport vehicle. The width of the modules corresponds to half the width of an ISO container (approx. 1215 mm) and the modules can also be coupled next to one another. This has the considerable advantage that the maximum track width is no longer limited by the width of the modules. As a result, the transport vehicle for large, heavy loads can be given any desired width without the modules becoming too large to handle.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: February 15, 2000
    Assignee: Itrec B.V.
    Inventors: Piet Kalkman, Joop Roodenburg
  • Patent number: 5823712
    Abstract: A method for laying a pipeline on a surface located under water such as a deep sea bed. The pipeline is held fixedly by tensioners having tensioning elements each extending between a clamping member engaging on the pipeline and a support member connected to a vessel. Tensioning is accomplished by sets of endless clamping bands which apply a braking action to the pipeline. A set of clamping jaws is clamped fixedly to the pipeline and moves along with the pipeline from a starting position to a releasing position. As a set of clamping jaws is clamped to the pipeline, another set of clamping jaws is released from the pipeline and returned to a starting position to continually repeat the cycle of holding and releasing of the pipeline.
    Type: Grant
    Filed: March 8, 1996
    Date of Patent: October 20, 1998
    Assignee: Allseas Group S.A.
    Inventors: Piet Kalkman, Joop Roodenburg, Anne Klaas de Groot