Patents by Inventor David Keith Young

David Keith Young 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 producing polypropylene tapes
    Patent number: 6758994
    Abstract: The present invention relates to a process for making polymer tapes utilizing metallocene catalysts. An isotactic propylene polymer is prepared by polymerizing propylene in the presence of an isospecific metallocene catalyst. The resulting polypropylene is heated, extruded and withdrawn as a sheet. The sheet is then slit longitudinally into tape segments and drawn in the longitudinal direction to a draw ratio of at least about 4.5:1 to produce an oriented tape. It has been found that these polypropylene tapes have different characteristics than those polypropylene tapes produced using Ziegler-Natta catalyst drawn at the same draw ratios.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: July 6, 2004
    Assignee: Fina Technology, Inc.
    Inventors: Mohan Gownder, George R. Rowland, Jr., David Keith Young