Patents by Inventor Grant Franklin Parrish

Grant Franklin Parrish 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).

  • Multiple-pass irradiation of polyolefin films
    Patent number: 6228314
    Abstract: The invention provides a process and apparatus for crosslinking a polymer film at a level of 500 kV or less. The distance between the emissions window of an irradiation means, e.g. a self-shielded electron beam processor, and first pass film, as well as between additional passes, is no more than 5 inches, preferably no more than 3 inches, and more preferably no more than 2 inches. The polymeric film is preferably a polyolefin, having a thickness ranging from about 0.00016 inches to about 0.007 inches. The film speed preferably ranges from about 500 ft/min to about 2000 ft/min.
    Type: Grant
    Filed: May 21, 1999
    Date of Patent: May 8, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Ricky L. Trueblood, Grant Franklin Parrish, Joseph E. Kotwis