Patents by Inventor Kornelis Joustra

Kornelis Joustra 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).

  • Penetrometer
    Patent number: 5886253
    Abstract: Penetrometer comprising a probe with a conical nose, a cylindrical friction casing, and means for measuring axial friction forces acting on the friction casing when the probe is advanced in an area of ground which is to be analysed.The probe furthermore has a conical casing and means for measuring the axial forces acting on the conical casing.The conicity of the conical casing is so minor that the conical casing causes a displacement of the surrounding ground which is directed substantially transverse to the axial direction of the probe.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: March 23, 1999
    Assignee: Verenigde Bedrijven Van den Berg Heerenveen Holding B.V.
    Inventor: Kornelis Joustra