Patents by Inventor William F. M. J. Willems

William F. M. J. Willems 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).

  • Sealable films
    Patent number: 4921749
    Abstract: A film having superior seal strength and barrier properties comprises a base layer comprising 70 to 97 weight % of a polyolefin, e.g. polypropylene, and 3 to 30% weight of a resin of lower molecular weight than the polyolefin, e.g. a hydrogenated petroleum resin. On at least one of the surfaces of the base layer is a 1 to 20 weight % of a film of a random copolymer of 80 to 99 weight % of propylene and 1 to 20 weight % of ethylene, for example, an isotactic propylene-ethylene copolymer.
    Type: Grant
    Filed: March 17, 1988
    Date of Patent: May 1, 1990
    Assignee: Exxon Chemical Patents Inc.
    Inventors: Bernard L. L. Bossaert, Stefan B. Ohlsson, William F. M. J. Willems