Patents by Inventor George Greig

George Greig 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).

  • Treatment of oily sludge
    Patent number: 4260489
    Abstract: Oily sludge is treated by filtering it through a precoated surface filter, treating the filtration residue with a hydrocarbon solvent and/or steam stripping the extracted residue.The residual oil content of the treated sludge is very low and it can be used for land fill operations.
    Type: Grant
    Filed: July 19, 1979
    Date of Patent: April 7, 1981
    Assignee: The British Petroleum Company Limited
    Inventors: George Greig, Michael P. Broadribb