Patents by Inventor Otto Marschall

Otto Marschall 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).

  • Zigzag arrangement of helical springs in devices for generating artificial reverberation
    Patent number: 3933345
    Abstract: Two consecutive portions of a single helical spring having a zig-zag arrangement are mutually interfitted with each other with their turns remaining out of contact, and with their taxes being in substantially tangential contact or, at the most, intersecting at an acute angle not in excess of 10 degrees. The ends of the two portions are firmly connected to each other directly at their deflection points, and the interconnection preferably is connected to one end of a soft spring whose opposite end is fixed to a rigid support. Consecutive helical spring portions may be wound in the same direction or in respective opposite directions.
    Type: Grant
    Filed: September 6, 1974
    Date of Patent: January 20, 1976
    Assignee: AKG-Akustische und Kino Gerate GmbH
    Inventors: Werner Fidi, Otto Marschall