Patents by Inventor George S. Nash

George S. Nash 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).

  • Process for devolatilizing molten oxymethylene polymer
    Patent number: 4692290
    Abstract: A process is provided for removing volatile materials from a molten oxymethylene polymer, according to which the molten polymer is passed through a rotating disk polymer processor having at least three stages; a first devolatilization stage, then a stabilization stage and then a second devolatilization stage. The molten polymer in the first devolatilization stage is maintained at a temperature above its melting point in the temperature range of from about 160.degree. C. to about 220.degree. C. and at a vapor space pressure of from about 0.1 to about 300 Torr. The polymer in the stabilization stage is maintained in the molten state at a temperature of from 160.degree. C. to about 220.degree. C. The polymer in the second devolatilization stage is maintained in the molten state at a temperature of from about 160.degree. C. to about 190.degree. C. and at a vapor space pressure of from about 0.1 to about 100 Torr.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: September 8, 1987
    Assignee: Celanese Corporation
    Inventors: Douglas W. Steele, George S. Nash, John W. Dorsey, Ronald S. Christy, Timothy L. Burns