Patents by Inventor Paulus A. Stuivenwold

Paulus A. Stuivenwold 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).

  • Sensor for detecting particles in a fluid flow
    Patent number: 4315428
    Abstract: A sensor for detecting sand grains in a fluid flow comprises a ring-shaped member carrying an acoustic transducer. The ring-shaped member is supported on a rod by clamping means, and material having elastic properties is arranged on the surfaces of the ring-shaped member that contact the rod or the clamping means.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: February 16, 1982
    Assignee: Shell Oil Company
    Inventors: Paulus A. Stuivenwold, Kornelis Van Timmeren
  • Measuring two-phase flow
    Patent number: 4300399
    Abstract: The individual flow rates of the phases of a flowing two-phase medium are determined by measuring the pressure differential between two locations in a pipe bend through which the flow passes.The average value of the pressure differential and the RMS value of the pressure fluctuations are determined and compared with predetermined reference data.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: November 17, 1981
    Assignee: Shell Oil Company
    Inventors: Petrus J. M. Kuijpers, Paulus A. Stuivenwold, Johannes van Arkel