Patents by Inventor Graham R. Johnson

Graham R. Johnson 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).

  • Precipitation of asphaltene
    Patent number: 4846957
    Abstract: Asphaltenes are separated from hydrocarbon oil by bringing the oil into contact with formic acid or a water-soluble organic acid consisting of carbon, hydrogen and oxygen and having at least two functional groups.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: July 11, 1989
    Assignee: The British Petroleum Company p.l.c.
    Inventors: Graham R. Johnson, Paul R. Rutter