Patents by Inventor Dora Maischner

Dora Maischner 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: 5486677
    Abstract: A method of machining workpieces with a laser beam wherein the machining cess, in particular the melting depth or the through-melting distance is monitored by detecting an optical and/or acoustical signal created by an unshielded laser-induced plasma or vapor. In order to receive monitoring date which as much as possible is independent of signal variations in the process the signals are subjected to a frequency analysis and the average amplitudes (Ax, Ay) of two different frequency bands (x, y) of the analyzed frequencies are used with a predetermined calculation function to determine a rating value (B).
    Type: Grant
    Filed: August 19, 1993
    Date of Patent: January 23, 1996
    Assignee: Fraunhofer-Gesellschaft zur Forderung der Angewandten Forschung E.V.
    Inventors: Dora Maischner, Alexander J. Drenker, Peter Abels, Eckhard Beyer