Patents by Inventor Blair G. W. Syme

Blair G. W. Syme 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 polyproplene films
    Patent number: 5246659
    Abstract: This invention concerns biaxially oriented polypropylene films containing from 1 to 40 percent by weight of a hydrocarbon resin, the resin being substantially miscible with the polypropylene, and the film having a crease retention of at least 50% as measured by ASTM D920-49. The hydrocarbon resin is preferably a terpene resin, a hydrogenated synthetic resin or a compatible rosin. Crease retention values in excess of 70% have been achieved in particular by orienting the films at a temperature of at least 10 Centigrade degrees below the crystalline melting point of the polypropylene.
    Type: Grant
    Filed: November 18, 1991
    Date of Patent: September 21, 1993
    Assignee: Courtaulds Films & Packaging (Holdings) Ltd.
    Inventors: Allan J. Crighton, Blair G. W. Syme
  • Polypropylene films
    Patent number: 5085943
    Abstract: This invention concerns biaxially oriented polypropylene films containing from 1 to 40 percent by weight of a hydrocarbon resin, the resin being substantially miscible with the polypropylene, and the film having a crease retention of at least 50% as measured by ASTM D920-49. The hydrocarbon resin is preferably a terpene resin, a hydrogenated synthetic resin or a compatible rosin. Crease retention values in excess of 70% have been achieved in particular by orienting the films at a temperature of at least 10 Centigrade degrees below the crystalline melting point of the polypropylene.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: February 4, 1992
    Assignee: Courtaulds Films & Packaging (Holdings) Ltd.
    Inventors: Allan J. Crighton, Blair G. W. Syme