Patents by Inventor Otto Chwalkowski

Otto Chwalkowski 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).

  • Picture tube demagnetizing coil arrangement
    Patent number: 4359707
    Abstract: A demagnetizing coil is situated in an aperture frame removably mounted around the picture screen of a picture tube.
    Type: Grant
    Filed: September 8, 1980
    Date of Patent: November 16, 1982
    Assignee: Robert Bosch GmbH
    Inventors: Dieter Spannhake, Otto Chwalkowski