Patents by Inventor Douglas DesRoches

Douglas DesRoches 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).

  • Devolatilizer tray array
    Patent number: 5874525
    Abstract: The residual level of monomer in a polymer may be reduced by passing a melt of the polymer through a devolatilizer column which contains an array of two or more trays having voids comprising from 15 to 50% of the surface of the tray which are offset so the voids in the upper tray are spaced over the solid areas of the tray below.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: February 23, 1999
    Assignee: Nova Chemicals Inc.
    Inventors: Steven M. Krupinski, Douglas DesRoches