Patents by Inventor David S. Bernzweig

David S. Bernzweig 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).

  • Metal detector audio amplifier
    Patent number: 4644290
    Abstract: An accessory device for use with a metal detector with means to amplify the low, barely audible audio output of the metal detector so that it can be easily heard with further means to dampen louder audio output signals causing those signals to be softer.
    Type: Grant
    Filed: February 14, 1986
    Date of Patent: February 17, 1987
    Inventor: David S. Bernzweig
  • Metal detector audio amplifier
    Patent number: 4594559
    Abstract: An accessory device for use with a metal detector with means to amplify the low, barely audible audio output of the metal detector so that it can be easily heard with further means to dampen louder audio output signals causing those signals to be softer.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: June 10, 1986
    Inventor: David S. Bernzweig