Patents by Inventor Frederick C. Lawrence

Frederick C. Lawrence 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).

  • Apparatus for maintaining unreacted monomer concentration in a polymerization reactor
    Patent number: 6042790
    Abstract: In a polymerization process utilizing a high pressure flash to separate polymer from unreacted monomer contained in the effluent stream from the reactor, the concentration of unreacted monomer in the reaction effluent is determined by withdrawing from the reactor an effective analyzing amount of effluent, exposing the amount to a low pressure flash and analyzing the vaporized portion to determine the concentration of monomer.
    Type: Grant
    Filed: October 24, 1994
    Date of Patent: March 28, 2000
    Assignee: Phillips Petroleum Company
    Inventors: John D. Hottovy, Frederick C. Lawrence, Nelson T. Black
  • Apparatus and method for producing ethylene polymer
    Patent number: 5565175
    Abstract: An apparatus and method for producing ethylene polymer are provided which employ a conduit in the form of a closed loop (i.e. loop reactor) for receiving a flow of a monomer which includes ethylene, a polymerization catalyst and a diluent therethrough for the polymerization of the monomer to ethylene polymer. The conduit comprises at least one pipe constructed of rolled plate around which coolant fluid passes in heat exchange relationship.
    Type: Grant
    Filed: October 1, 1990
    Date of Patent: October 15, 1996
    Assignee: Phillips Petroleum Company
    Inventors: John D. Hottovy, Frederick C. Lawrence, Barry W. Lowe, James S. Fangmeier
  • Flash gas sampling for polymerization reactions
    Patent number: 5387659
    Abstract: In a polymerization process utilizing a high pressure flash to separate polymer from unreacted monomer contained in the effluent stream from the reactor, the concentration of unreacted monomer in the reaction effluent is determined by withdrawing from the reactor an effective analyzing amount of effluent, exposing the amount to a low pressure flash and analyzing the vaporized portion to determine the concentration of monomer.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: February 7, 1995
    Assignee: Phillips Petroleum Company
    Inventors: John D. Hottovy, Frederick C. Lawrence, Nelson T. Black