Patents by Inventor David E. Gledhill

David E. Gledhill 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).

  • Encoding means and method for a bag making apparatus
    Patent number: 4632667
    Abstract: A system for identifying the origin of a plastic bag made from web stock on a machine having a plurality of bag making stations wherein each station has a vacuum port for holding the web stock to the station during the bag making operation and each vacuum port has an identifying characteristic which is impressed in the web stock to identify the work station.
    Type: Grant
    Filed: November 27, 1984
    Date of Patent: December 30, 1986
    Assignee: Union Carbide Corporation
    Inventors: James A. McDonald, David E. Gledhill, Peter P. Savich