Patents by Inventor Dirkson D. S. Liu

Dirkson D. S. Liu 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).

  • Antifoam to achieve high conversion in hydroconversion of heavy oils
    Patent number: 4969988
    Abstract: A process for the conversion of a heavy hydrocarbon oil in the presence of hydrogen and a catalyst or additive is described. It is shown that conversion can be increased by injecting an anti-foaming agent or a solution of anti-foaming agent in light oil into the reactor. Significantly better results are obtained when the anti-foam or the solution of anti-foam is injected directly into the top section of the reactor.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: November 13, 1990
    Assignee: Petro-Canada Inc.
    Inventors: Anil K. Jain, Barry B. Pruden, Dennis Lambiris, Serge Rivard, Dirkson D. S. Liu
  • Multiple measuring control volume laser doppler anemometer
    Patent number: 4537503
    Abstract: The multiple measuring control volume laser Doppler anemometer includes a laser for providing an optical beam. The beam is transformed by an optical arrangement to produce a number V of measuring control volumes wherein each control volume has two focussed optical beams intersecting at a unique predetermined angle .phi.. A detector collects the scattered light from the measuring control volumes in order to determine the velocity at each of the control volumes.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: August 27, 1985
    Assignee: Atomic Energy of Canada Limited
    Inventor: Dirkson D. S. Liu