Patents by Inventor Keith W. Trapp

Keith W. Trapp 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).

  • Methods and devices for polymerization
    Patent number: 8084554
    Abstract: A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall.
    Type: Grant
    Filed: February 11, 2008
    Date of Patent: December 27, 2011
    Assignee: Univation Technologies, LLC
    Inventors: Agapios K. Agapiou, David M. Glowczwski, Zerong Lin, Gary D. Mohr, Ted A. Powell, Michael E. Sieloff, Edward F. Smith, Kevin B. Stavens, Keith W. Trapp, Michael E. Muhle, F. David Hussein
  • METHODS FOR APPLYING SOLUTION CATALYSTS TO REACTOR SURFACES
    Publication number: 20100184927
    Abstract: A method for treating at least one interior surface (for example, a bed wall) of a fluidized bed polymerization reactor system, including by applying a solution catalyst (preferably at least substantially uniformly and in liquid form) to each surface, and optionally (where a catalyst component of the solution catalyst comprises at least one chromium containing compound) oxidizing at least some of the applied chromium containing compound in a controlled manner.
    Type: Application
    Filed: February 21, 2008
    Publication date: July 22, 2010
    Applicant: UNIVATION TECHNOLOGIES, LLC
    Inventors: Robert O. Hagerty, Kevin B. Stavens, Randall B. Laird, Zerong Lin, Michael E. Muhle, Agapios K. Agapiou, David M. Glowczwski, Fathi D. Hussein, Gary D. Mohr, Ted A. Powell, Michael E. Sieloff, Edward F. Smith, Keith W. Trapp
  • METHODS AND DEVICES FOR POLYMERIZATION
    Publication number: 20100076164
    Abstract: A method of treating a gas phase fluidized bed reactor and a method of polymerizing olefins in a gas phase fluidized bed reactor in the presence of a catalyst prone to cause sheeting by introducing a chromium-containing compound into the reactor and forming a high molecular weight polymer coating on the walls of the reactor. Furthermore, a device for and method of introducing the chromium-containing compound into the fluidized bed reactor at a plurality of locations in proximity to a lower section of a bed section wall of the fluidized bed reactor, and forming a high molecular weight polymer coating on the bed section wall.
    Type: Application
    Filed: February 11, 2008
    Publication date: March 25, 2010
    Applicant: Univation Technologies, LLC
    Inventors: Agapios K. Agapiou, David M. Glowczwski, Zerong Lin, Gary D. Mohr, Ted A. Powel, Michael E. Sieloff, Edward F. Smith, Kevin B. Stavens, Keith W. Trapp, Michael E. Muhle, F. David Hussein
  • Methods of producing polyolefins and films therefrom
    Patent number: 6995235
    Abstract: Films and methods of forming films comprising first combining in a reactor olefins, a catalyst composition and an activator; wherein the activator is present from less than 50 wt % in a diluent by weight of the activator and diluent; followed by isolating a polyolefin having a density of from 0.940 to 0.980 g/cm3; and finally, extruding the polyolefin into a film having a gel count of less than 200 gels/m2.
    Type: Grant
    Filed: May 2, 2005
    Date of Patent: February 7, 2006
    Assignee: Univation Technologies, LLC
    Inventors: Fred D. Ehrman, Rainer Kolb, Chi-I Kuo, Porter C. Shannon, Keith W. Trapp