Patents by Inventor D. L. Smith

D. L. Smith 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).

  • Rotating joint for extrusion die
    Patent number: 4203715
    Abstract: A rotating joint assembly for feeding an extrusion die with two or more thermoplastic layers of a consistent uniformity of distribution including a stationary manifold for receiving two or more thermoplastic streams and conveying the streams to discharge openings in the manifold, and a cylindrical conduit rotatably connected to the manifold, the conduit having intake openings aligned with discharge openings in the stationary base for receiving and conveying thermoplastic streams from the base to an extrusion die and an axial channel aligned with an axial channel in the stationary manifold for receiving and conveying one of the thermoplastic streams to the die.
    Type: Grant
    Filed: March 24, 1978
    Date of Patent: May 20, 1980
    Assignee: Ethyl Corporation
    Inventors: Garland E. Raley, C. W. Miller, D. L. Smith