Patents by Inventor John L. Warthen

John L. Warthen 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).

  • Multi-component polyolefin catalysts
    Patent number: 5714424
    Abstract: The present invention encompasses a monolithic multi-component composite polyolefin catalyst particle comprising at least two distinct supported catalyst components wherein each catalyst component is capable of producing a resin having a melt index different from at least one other catalyst component under constant reaction conditions. Methods of producing and using the multi-component catalyst are disclosed.
    Type: Grant
    Filed: January 9, 1995
    Date of Patent: February 3, 1998
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: John L. Warthen, Rimantas Glemza