Patents by Inventor David A. Yahn

David A. Yahn 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: 8148481
    Abstract: A method for preparing a reactor for performance of a polymerization reaction, the method including providing at least one seed bed into the reactor; wherein the at least one seed bed includes at least one organometallic compound and polymer particles.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: April 3, 2012
    Assignee: Univation Technologies, LLC
    Inventors: F. David Hussein, Mark G. Goode, Michael E Muhle, David A. Yahn, Robert O. Hagerty
  • Publication number: 20110294973
    Abstract: A method for preparing a reactor for performance of a polymerization reaction, the method including providing at least one seed bed into the reactor; wherein the at least one seed bed includes at least one organometallic compound and polymer particles.
    Type: Application
    Filed: December 17, 2009
    Publication date: December 1, 2011
    Applicant: UNIVATION TECHNOLOGIES, LLC
    Inventors: F. David Hussein, Mark G. Goode, Michael E. Muhle, David A. Yahn, Robert O. Hagerty
  • Patent number: 7505129
    Abstract: Methods and systems for analysis of the polymerization material of solution polymerization processes are provided. In certain embodiments, the methods and systems subject the polymerization material to Raman spectroscopy analysis. The Raman spectroscopy provides analysis of reaction mixtures and/or product streams in solution polymerization processes. The Raman spectroscopy analysis may include both compositional and characterization analysis of the reaction mixtures and product streams. The spectroscopy results can be used to provide process control feedback to adjust operating parameters of the reactor operations and/or an associated polymerization product handling and finishing processes.
    Type: Grant
    Filed: June 23, 2006
    Date of Patent: March 17, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: David Geoffrey Marrow, Blu Eric Englehorn, David A. Yahn
  • Patent number: 7505127
    Abstract: Methods and systems for analysis of the polymerization material of high pressure polymerization processes are provided. In certain embodiments, the methods and systems subject the polymerization material to Raman spectroscopy analysis. The Raman spectroscopy provides analysis of reaction mixtures and/or product streams in high pressure polymerization processes. The Raman spectroscopy analysis may include both compositional and characterization analysis of the reaction mixtures and product streams. The spectroscopy results can be used to provide process control feedback to adjust operating parameters of the reactor operations and/or an associated polymerization product handling and finishing processes.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: March 17, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: David Geoffrey Marrow, David A. Yahn
  • Patent number: 7483129
    Abstract: Method and systems for online analysis of a polymeric material within a mixing device are provided. In certain embodiments, the methods and systems subject the polymeric material to Raman spectroscopy analysis. The Raman spectroscopy provides analysis of polymer properties that may include melt index, density, viscosity, molecular weight, molecular weight distribution, weight ratios of different polymers comprising the polymeric material, additive concentrations, crosslinking agent concentrations, scissoring agent concentrations, and combinations thereof. The spectroscopy results can be used to provide process control to adjust operating parameters of the mixing device and/or an associated polymerization process. The mixing device may be an extruder. The methods and systems may also include a processor for evaluating the results of the Raman analysis and automatically adjusting the mixing device and/or polymerization processes.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: January 27, 2009
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: David Geoffrey Marrow, David A. Yahn, Thomas R. Veariel