Patents by Inventor Lodewikus N. J. De Jong

Lodewikus N. J. De Jong 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).

  • Method of inhibiting asphalt precipitation in an oil production well
    Patent number: 5139088
    Abstract: Asphalt precipitation in the flow path of an oil production well is inhibited by splitting the produced crude oil in a separator train into a light fraction containing gaseous and oil components having a relatively low aromaticity and molar weight and a heavy fraction having a relatively high aromaticity and molar weight and subsequently reinjecting at least part of the heavy fraction to a location in the flow path of the well where asphalt precipitation is expected to occur.
    Type: Grant
    Filed: September 5, 1990
    Date of Patent: August 18, 1992
    Assignee: Shell Oil Company
    Inventors: Roelof B. De Boer, Lodewikus N. J. De Jong