Patents by Inventor Donald R. Marshall

Donald R. Marshall 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).

  • Free radical copolymerization of ethylene and CO with acetone
    Patent number: 5057593
    Abstract: An improvement in the process for the continuous copolymerization of ethylene with carbon monoxide and optionally certain polar comonomers having reactive double bonds, wherein a single phase is maintained in the reactor by means of acetone introduced concurrently with the reactants, whereby reactor fouling is significantly reduced or eliminated.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: October 15, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald R. Marshall, Robert J. Statz, James D. White
  • Methanol copolymerization of ethylene
    Patent number: 5028674
    Abstract: An improvement in the process for the continuous copolymerization of ethylene with certain polar comonomers having reactive double bonds, wherein a single phase is maintained in the reactor by means of methanol introduced concurrently with the reactants, whereby reactor fouling is significantly reduced or eliminated.
    Type: Grant
    Filed: June 6, 1990
    Date of Patent: July 2, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Paul B. Hatch, Donald R. Marshall