Patents by Inventor Charles W. Williamson

Charles W. Williamson 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).

  • Process for tubular water-bath polypropylene films
    Patent number: 4203942
    Abstract: Substantial and commercially important increases in polypropylene film production rates without adversely affecting film quality are obtained in a tubular water film process. The improvements comprise modifications in the die lip, in the mandrel air (fluid) slot affecting the cooling gas velocity, and in the upper bubble pressure control. The improvements are especially useful to obtain mill rolls 60 to 80 inches wide.
    Type: Grant
    Filed: December 9, 1977
    Date of Patent: May 20, 1980
    Assignee: Exxon Research & Engineering Co.
    Inventors: J. Robert Sims, Jr., Willard N. Mitchell, Charles W. Williamson