Patents by Inventor Hans G. Schaefer

Hans G. Schaefer 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).

  • Method and apparatus for heat sealing a plurality of sets of continuous plastic strips together by radio frequency energy
    Patent number: 4295908
    Abstract: Radio frequency heat sealing method and apparatus for simultaneously fabricating a plurality of separate items from separate sets of continuous plastic strips or sheets as these sets are indexed in unison past a heat sealing station. The technique utilizes a platen equipped with heat fusing and tear sealing dies on its opposite faces and which platen is located between separate sets of plastic strips and a pair of cooperating platens. The die equipped intermediate platen is preferably cooled to permit rapid cycling and indexing of the sets of stripping therepast.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: October 20, 1981
    Assignee: Manhattan R. F. Die Company
    Inventors: Hans G. Schaefer, Alfred Langer