Patents by Inventor Lee A. Littlejohn

Lee A. Littlejohn 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).

  • Patent number: 8101086
    Abstract: A process for the separation of production fluids is provided. The production fluids comprise an oil/water emulsion stabilized with fine solids. The emulsion may further comprise asphaltenes and naphthenic acids and resins. The process includes subjecting the emulsion to a flocculating agent to flocculate solids within the emulsion, and separating water and solids from crude oil in a first separator. The process further includes subjecting the separated crude oil to a demulsifier after subjecting the emulsion to a flocculating agent, and further separating water from the crude oil in a second separator. A process for producing fluids from a hydrocarbon-bearing reservoir is also provided, using the separation processes herein.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: January 24, 2012
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Ramesh Varadaraj, Lee A. Littlejohn
  • Publication number: 20090200213
    Abstract: A process for the separation of production fluids is provided. The production fluids comprise an oil/water emulsion stabilized with fine solids. The emulsion may further comprise asphaltenes and naphthenic acids and resins. The process includes subjecting the emulsion to a flocculating agent to flocculate solids within the emulsion, and separating water and solids from crude oil in a first separator. The process further includes subjecting the separated crude oil to a demulsifier after subjecting the emulsion to a flocculating agent, and further separating water from the crude oil in a second separator. A process for producing fluids from a hydrocarbon-bearing reservoir is also provided, using the separation processes herein.
    Type: Application
    Filed: June 14, 2007
    Publication date: August 13, 2009
    Inventors: Ramesh Varadaraj, Lee A. Littlejohn
  • Patent number: 4575426
    Abstract: A method and apparatus for removing oil from the surface of a body of water, subtidal seafloor, a riverbed, a shoreline or a beach are disclosed. The method employs a sweeping action of oleophilic bristles comprising at least one brush to remove oil from such a surface and a suction means to remove oil from the bristles. The apparatus comprises one or more oleophilic bristled brushes connected to a support means. The brushes are positioned so that they have a lower portion in contact with the oil and an upper portion above the oil. A motor means moves the brushes so that the oil is drawn into the brushes. A suction means, such as an air conveyor system, removes the oil from the brushes.
    Type: Grant
    Filed: June 19, 1984
    Date of Patent: March 11, 1986
    Assignee: Exxon Production Research Co.
    Inventors: Lee A. Littlejohn, Keith F. Kruk, Robert E. Williams, Thomas F. Bailey