Patents Assigned to Dusseldorfer Lackgrosshandlung Otto Hartung GmbH
  • 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