Patents by Inventor Frederick David Stringer

Frederick David Stringer 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).

  • Winding core for heat shrinkable film material
    Patent number: 4114756
    Abstract: A generally cylindrical core for winding a web of sheetlike material has portions with a lesser diameter than other portions such that otherwise baggy areas of the web overlie the lesser diameter area of the core. The core particularly solves the problem of elongated edges on a wound film of heat shrinkable thermoplastic material caused by differential shrinkage about a core.
    Type: Grant
    Filed: December 13, 1976
    Date of Patent: September 19, 1978
    Assignee: W. R. Grace & Co.
    Inventors: Raymond B. Dacey, Frederick David Stringer