Patents by Inventor Robert Parrish

Robert Parrish 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).

  • Reactor product discharge system
    Publication number: 20010034422
    Abstract: A process is disclosed for removing particulate product from a fluidized bed reactor to optimize, within the constraints of the product removal cycle, conservation of gas in which the product is entrained. Data are compiled on the time required for equalizing pressure between product discharge tanks, and these data are used to determine the optimum times for various valves to be open. Product movement steps and equalization steps can be performed simultaneously.
    Type: Application
    Filed: June 22, 2001
    Publication date: October 25, 2001
    Inventors: Ivan Jeremy Hartley, Guadalupe Garcia Leal, John Roberts Parrish
  • Reactor product discharge system
    Patent number: 6255411
    Abstract: A process is disclosed for removing particulate product from a fluidized bed reactor to optimize, within the constraints of the product removal cycle, conservation of gas in which the product is entrained. Data are compiled on the time required for equalizing pressure between product discharge tanks, and these data are used to determine the optimum times for various valves to be open. Product movement steps and equalization steps can be performed simultaneously.
    Type: Grant
    Filed: April 7, 1999
    Date of Patent: July 3, 2001
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Ivan Jeremy Hartley, Guadalupe Garcia Leal, John Roberts Parrish
  • Control of gas phase polymerization reactions
    Patent number: 6063877
    Abstract: The present invention teaches a process for controlling a continuous gas phase (exothermic) process operating in condensing mode (e.g. polymerization) with a selected temperature for the reactor bed or outlet and with a temperature differential between the reactor inlet and the reactor bed or outlet by controlling the heat transfer provided by the heat exchanger in the recycle line to maintain the selected reactor bed temperature or outlet temperature while simultaneously controlling a condensable liquid feed rate to maintain the temperature differential.
    Type: Grant
    Filed: July 31, 1997
    Date of Patent: May 16, 2000
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Harvey Gene Kocian, David Merrill Rebhan, John Roberts Parrish, Thomas Walter Pilgram
  • Method of fluidized bed temperature control
    Patent number: 5990250
    Abstract: An improved method of bed temperature control is provided by the coordinated manipulation of the water flow rate in one or more heat exchangers and cycle gas flow rate to the reactor.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: November 23, 1999
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: John Roberts Parrish, August Joseph Boldt, Thomas James McNeil, Ivan Jeremy Hartley
  • Process control in the presence of chromium based catalysts
    Patent number: 5844054
    Abstract: A continuous process for the polymerization of one or more alpha-olefins in the gas phase in the presence of a chromium based catalyst, under polymerization conditions including the reaction temperature, the pressure, and the target oxygen to alpha-olefin molar ratio operating point required for desired resin properties.
    Type: Grant
    Filed: March 21, 1997
    Date of Patent: December 1, 1998
    Inventors: Paul Kevin Samples, William Albert Matthews, John Roberts Parrish, Ivan Jeremy Hartley, Kiu Hee Lee