Patents by Inventor John N. Yeates

John N. Yeates 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).

  • Separation of polymer from hydrocarbon solvent in the manufacture of polymers of ethylene
    Patent number: 4673768
    Abstract: An improved method for the separation of polymer from hydrocarbon solvent in a process for the manufacture of poly-.alpha.-olefins is disclosed. A solution of polymer and solvent at a temperature above 130.degree. C. and a pressure above atmospheric pressure is passed through pressure reduction means into a vessel. Solvent is flashed off and the polymer forms a pool of molten polymer. The temperature of the walls of the vessel above the pressure reduction means is maintained at least 10.degree. C., and especially at least 30.degree. C., above the temperature of the walls of the remainder of the vessel. The improved method is less susceptible to the formation of gel in the polymer.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: June 16, 1987
    Assignee: Du Pont Canada Inc.
    Inventor: John N. Yeates