Patents by Inventor Don Austin Duggar

Don Austin Duggar 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).

  • Apparatus and method for pressurizing a propylene polymerization reactor
    Patent number: 6455010
    Abstract: A system for pressurizing a propylene polymerization reactor includes: a pressurization vessel including an internal heat exchanger; a pressure sensor for monitoring the pressure in the vessel, the pressure sensor providing a signal indicative of the pressure in the vessel; a control valve for supplying heated gas to a first region of the vessel in response to signals from the pressure sensor, the first region of the vessel being maintained above the critical temperature and pressure of propylene; a temperature sensor for monitoring the temperature in a second region of the pressurization vessel, the temperature sensor providing a signal indicative of the temperature in the second region of the vessel; and a control valve for supplying a cooling medium to the internal heat exchanger to cool propylene in the second region below the critical temperature of propylene at the pressure in the pressurization vessel.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: September 24, 2002
    Assignee: Fina Technology, Inc.
    Inventors: Thanh Nguyen, Wes Parker, Don Austin Duggar, Aron Griffith
  • Method for pressurizing a propylene polymerization reactor
    Patent number: 6214944
    Abstract: A system for pressurizing a propylene polymerization reactor includes: a pressurization vessel including an internal heat exchanger; a pressure sensor for monitoring the pressure in the vessel, the pressure sensor providing a signal indicative of the pressure in the vessel; a control valve for supplying heated gas to a first region of the vessel in response to signals from the pressure sensor, the first region of the vessel being maintained above the critical temperature and pressure of propylene; a temperature sensor for monitoring the temperature in a second region of the pressurization vessel, the temperature sensor providing a signal indicative of the temperature in the second region of the vessel; and a control valve for supplying a cooling medium to the internal heat exchanger to cool propylene in the second region below the critical temperature of propylene at the pressure in the pressurization vessel.
    Type: Grant
    Filed: February 2, 1999
    Date of Patent: April 10, 2001
    Assignee: Fina Technology, Inc.
    Inventors: Thanh Nguyen, Wes Parker, Don Austin Duggar, Aron Griffith