Patents by Inventor John D. Hedengren

John D. Hedengren 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).

  • Patent number: 9296833
    Abstract: Disclosed herein are methods for controlling bubble formation in a polymerization reactor. The method includes: (a) determining a concentration of at least one component at a location in the reactor using a mathematical model; (b) determining a vapor pressure of the composition based at least in part upon the concentration of the component; (c) determining an operating pressure of the reactor at the location; (d) determining a pressure difference as ?P=PX?PV, wherein PX is the operating pressure and PV is the vapor pressure; (e) comparing the ?P to a threshold value; and (f) implementing an effect when the ?P is less than the threshold value.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: March 29, 2016
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Kevin W. Lawson, John D. Hedengren, Lawrence C. Smith
  • Publication number: 20130203946
    Abstract: Disclosed herein are methods for controlling bubble formation in a polymerization reactor. The method includes: (a) determining a concentration of at least one component at a location in the reactor using a mathematical model; (b) determining a vapor pressure of the composition based at least in part upon the concentration of the component; (c) determining an operating pressure of the reactor at the location; (d) determining a pressure difference as ?P =PX-PV, wherein PX is the operating pressure and PV is the vapor pressure; (e) comparing the ?P to a threshold value; and (f) implementing an effect when the ?P is less than the threshold value.
    Type: Application
    Filed: July 16, 2010
    Publication date: August 8, 2013
    Inventors: Kevin W. Lawson, John D. Hedengren, Lawrence C. Smith