Patents by Inventor John R. Parrish

John R. 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).

  • Control of resin properties
    Patent number: 6846884
    Abstract: A method for controlling resin properties during the production of polyolefins is provided. The method utilizes coordinated manipulation of reaction temperature in combination with a secondary process variable to control resin flow properties to rapidly respond to manufacturing upsets or specification changes to minimize off-grade or transition polymer material when moving from one polymer grade to another, or during a disturbance in a steady state production.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: January 25, 2005
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: John R. Parrish, Ivan J. Hartley, Lonnie L. Pinson
  • Use of cumulative distributions to improve reactor control
    Publication number: 20040254309
    Abstract: A method of manufacturing a polymer composition that includes initiating a polymerization reaction at an initial set of polymerization parameters, determining a distribution of the at least one property of an intermediate polymer composition, and adjusting the initial set of polymerization parameters based on the distribution of the at least one property to obtain a desired distribution of the at least one property in the polymer composition. The method is suitable for use in blending and trimming operations as well as in polymerization processes.
    Type: Application
    Filed: May 14, 2004
    Publication date: December 16, 2004
    Inventors: John R. Parrish, William H. Sachs, Mark L. Nelson
  • Control of resin properties
    Publication number: 20040063871
    Abstract: A method for controlling resin properties during the production of polyolefins is provided. The method utilizes coordinated manipulation of reaction temperature in combination with a secondary process variable to control resin flow properties to rapidly respond to manufacturing upsets or specification changes to minimize off-grade or transition polymer material when moving from one polymer grade to another, or during a disturbance in a steady state production.
    Type: Application
    Filed: September 27, 2002
    Publication date: April 1, 2004
    Inventors: John R. Parrish, Ivan J. Hartley, Lonnie L. Pinson
  • Process for controlling gas phase fluidized bed polymerization reactor
    Patent number: 5627242
    Abstract: Control of a gas phase polymerization reactor is performed with the product melt index, the reaction temperature, and the partial pressure of the controlling reactant.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: May 6, 1997
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Lance L. Jacobsen, Kiu H. Lee, John R. Parrish
  • Fast gas chromatography method, apparatus and applications
    Patent number: 5589630
    Abstract: The present invention is directed to methods and apparatus for conducting gas chromatography more rapidly than previously disclosed. By means of the present invention the time necessary to conduct a gas chromatographic analysis can be reduced by more than 50%. The methods and apparatus employed reduce system dead volumes to prevent band broadening and mixing of the sample components as the gas sample is analyzed. The present invention also relates to the apparatus described above as applied to controlling chemical, refining, and other processes.
    Type: Grant
    Filed: April 26, 1995
    Date of Patent: December 31, 1996
    Assignee: Union Carbide Chemicals & Plastics Technology Corporation
    Inventors: Patrick M. Wiegand, John F. Fisher, John R. Parrish, Elizabeth S. Ballard, Courtland P. Sears, III, George W. Schwarz, Jr., Cloid R. Smith, III