Patents by Inventor Leonhard Hoefter

Leonhard Hoefter 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).

  • Patent number: 6518084
    Abstract: In a method of producing a micromechanical structure for a micro-electromechanical element, a first intermediate layer, which is applied to a first main surface of a first semiconductor wafer, is structured in a first step so as to produce a recess. The first semiconductor wafer is then connected via the first intermediate layer to a second semiconductor wafer in such a way that a hermetically sealed cavity is defined by the recess. Finally, one of the wafers is thinned from a surface facing away from said first intermediate layer so as to produce a diaphragm-like structure on top of the cavity. At least one further intermediate layer is provided between the two semiconductor wavers which, prior to the connection of the two semiconductor wafers, is structured in such a way that the structure formed in said at least one further intermediate layer and the recess in said first intermediate layer define the cavity.
    Type: Grant
    Filed: September 12, 2001
    Date of Patent: February 11, 2003
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Stefan Seitz, Leonhard Hoefter, Juergen Kruckow, Karl Neumeier, Dieter Bollmann