Patents by Inventor Oswald Bergman

Oswald Bergman 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).

  • Heat sealing apparatus and method
    Patent number: 4419167
    Abstract: Profiled heat seals in plastic film are provided by opposed profiled heat sealing platens supported on endless chains. The platens are heated by contact with associated heating drums.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: December 6, 1983
    Assignee: The Dow Chemical Company
    Inventors: Robert A. Hay, II, Oswald Bergman
  • Extruded plastic foam shaping apparatus
    Patent number: 4292019
    Abstract: Forming plates for the extrusion of foam from a slot die are provided which are adjustable in relationship to a generally adjacent die face. A movable plate portion is disposed adjacent the die face. The movable portion has a semi-cylindrical groove disposed therein. A pivoting forming plate having half-round edges has one edge disposed within the movable plate. The opposed half-round edge of the pivoting plate rests in a semi-cylindrical groove within a fixed forming plate. A similar opposed plate arrangement is employed on the opposite side of the die slot.
    Type: Grant
    Filed: January 7, 1980
    Date of Patent: September 29, 1981
    Assignee: The Dow Chemical Company
    Inventors: Robert A. Hay, Oswald Bergman