Patents by Inventor Karlheinz Durst

Karlheinz Durst 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).

  • Container with frangible piercing point
    Patent number: 4072233
    Abstract: A container includes a plurality of walls that define an enclosed space. One of the container walls has a frangible piercing point thereon adapted to be penetrated by an extraction device such as a drinking straw, the piercing point being defined by a depression formed in the exterior surface of the container wall, but which does not penetrate completely through the wall. The depression is surrounded by an annular ring, which marks its location, and the container walls are preferably made of a plurality of layers of laminated material.
    Type: Grant
    Filed: August 13, 1976
    Date of Patent: February 7, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Kramer, Karlheinz Durst