Patents by Inventor Ingrid Sorum Melaaen

Ingrid Sorum Melaaen 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).

  • Method of catalyst transitions in olefin polymerizations
    Patent number: 6284849
    Abstract: A method for transitioning between two different catalysts in olefin polymerizations, a first catalyst and a second catalyst, comprising the steps of: discontinuing the feed of the first catalyst into the polymerization reactor, and introducing the second catalyst into the reactor, wherein the transition is performed between a chromium-based catalyst and a metallocene catalyst.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: September 4, 2001
    Assignee: Borealis A/S
    Inventors: Vidar Almquist, Tone Aastad, Ingrid Sorum Melaaen, Harri Hokkanen, Kalle Kallio