Patents by Inventor Otto Brunnert

Otto Brunnert 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).

  • Method and apparatus for the permanent polarization of piezoelectric bodies
    Patent number: 4088917
    Abstract: A method and apparatus for processing piezoelectric bodies to have a permanent polarization for use as electroacoustic transducers or the like are described. During the application of a constant polarizing electric field to a piezoelectric body, the surfaces of the body, which for example, might be in the shape of a disc, have applied thereto a surface pressure. A clamping device having smooth surfaces is used for this purpose.
    Type: Grant
    Filed: April 8, 1976
    Date of Patent: May 9, 1978
    Assignee: Siemens Aktiengesellschaft
    Inventors: Erwin Martin, Helmut Hoffmann, Otto Brunnert