Patents by Inventor Lester M. Burkholder

Lester M. Burkholder 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).

  • Conduit making machine, and method of making an article made thereby
    Patent number: 3947947
    Abstract: A machine is provided, for continuously making drainage conduit of two pieces, with various mechanisms for performing forming, punching, joining, sawing and ejecting functions, as material is carried through the machine.
    Type: Grant
    Filed: May 17, 1973
    Date of Patent: April 6, 1976
    Assignee: Penn Berks Corporation
    Inventors: James R. Hess, Lester M. Burkholder, Richard L. Rettew