Patents by Inventor Helmut Hartung

Helmut Hartung 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 of producing a protective helmet
    Patent number: 4288268
    Abstract: In a method of producing a protective helmet the steps include applying a first layer of hardenable synthetic resin and fibrous tissue on a predetermined surface of a positive-type mold, thereafter tensioning the fibrous tissue, and subsequently repeating the layer-applying and tensioning steps a prearranged number of times, so as to obtain successive layers forming the protective helmet.
    Type: Grant
    Filed: December 19, 1979
    Date of Patent: September 8, 1981
    Assignee: Dusseldorfer Lackgrosshandlung Otto Hartung GmbH
    Inventor: Helmut Hartung