Patents by Inventor Harm Mast

Harm Mast 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: 4296628
    Abstract: A sensor system for detecting sand in a gas/liquid flow passing through a pipeline comprising two sensors located in the flow. One of the sensors is covered with a layer of acoustic dampening material. By subtracting the signals generated by the sensors, a signal is obtained that is substantially free from noise generated by the gas present in the two phase flow.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: October 27, 1981
    Assignee: Shell Oil Company
    Inventor: Harm Mast
  • Patent number: 4240287
    Abstract: A method and apparatus for detecting sand particles in a flowing fluid, for example, the production from a gas or oil well. An acoustic transducer is used to detect the sand particles and the resulting signal is filtered to pass a frequency band of 50 to 500 kiloherz. A pulse height discriminating means and pulse counter is provided for counting the number of pulses that exceed a pre-set amplitude.
    Type: Grant
    Filed: November 2, 1978
    Date of Patent: December 23, 1980
    Assignee: Shell Oil Company
    Inventors: Harm Mast, Jan W. Kraayeveld, Peter B. Vriezen, Gerrit J. Wunnink