Patents by Inventor Gerbertus H. DE Vries

Gerbertus H. DE Vries 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).

  • Serial flow crystallization at linearly decreasing pressures
    Patent number: 3932142
    Abstract: A process and apparatus for obtaining crystals of a particular substance from a flowing solution thereof, by supplying the seeding crystals to one n.sup.th portion of the saturated solution and supplying one n.sup.th portion of the solution to the crystalliser further downstream at each of (n-1) places. The supersaturation of the solution is maintained at the required value by keeping the static pressure so low that self-vaporisation occurs, whereas this static pressure is caused to drop gradually in the crystalliser from its inlet end toward its discharge end.
    Type: Grant
    Filed: November 1, 1972
    Date of Patent: January 13, 1976
    Assignees: Stork Werkspoor Sugar B.V., Suiker Unie Holding B.V.
    Inventors: Gerbertus H. DE Vries, Gerrit C. DE Bruyn