Patents by Inventor Steven Don Sandstrum

Steven Don Sandstrum 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: 7452954
    Abstract: The invention relates to a polymer of ethylene which has a ?o/?2 ratio of at least 13; and a high load melt index HLMI lower than 8 g /10 min, and a value of tan ? at ?/?c=0.01 of less than 1.3, where ? is G?/G?, ? is the frequency at which G? and G? are measured and we is the frequency at which G?=G?, and G and G? are respectively the elastic modulus and viscous modulus, both measured in Pa at 190° C.; a process for making the polymer using a catalyst comprising chromium supported on a silica-titania support is also described.
    Type: Grant
    Filed: November 5, 2004
    Date of Patent: November 18, 2008
    Assignee: Ineos Manufacturing Belgium NV
    Inventors: Abel Grosjean, Steven Don Sandstrum, John Mark Zimmerman