Patents by Inventor Herwig Schmidt

Herwig Schmidt 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 the production of frusto-pyramidal can bodies
    Patent number: 5000370
    Abstract: Circular cylindrical bodies (2) are formed from rectangular sheet-metal blanks by rounding and longitudinal seam welding. These are widened oval-conically over their whole length in a first expanding operation and then relaxed again. Then the bodies (2) are widened in a second expanding operation so that they acquire their polygon-like, particularly rectangle-like, cross-sectional shape over their whole length. As a result, the bodies are stressed at their marginal regions at the ends in such a manner that these marginal regions do not become undulatory and can therefore be satisfactorily joined with a can cover or bottom.
    Type: Grant
    Filed: October 27, 1989
    Date of Patent: March 19, 1991
    Assignee: Elpatronic AG
    Inventor: Herwig Schmidt
  • Method and apparatus for the production of frusto-pyramidal can bodies
    Patent number: 4901557
    Abstract: Circular cylindrical bodies (2) are formed from rectangular sheet-metal blanks by rounding and longitudinal seam welding. These are widened oval-conically over their whole length in a first expanding operation and then relaxed again. Then the bodies (2) are widened in a second expanding operation so that they acquire their polygon-like, particularly rectangle-like, cross-sectional shape over their whole length. As a result, the bodies are stressed at their marginal regions at the ends in such a manner that these marginal regions do not become undulatory and can therefore be satisfactorily joined with a can cover or bottom.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: February 20, 1990
    Assignee: Elpatronic AG
    Inventor: Herwig Schmidt