Patents by Inventor John G. Dobbie

John G. Dobbie 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).

  • Automatic musical tuning device
    Patent number: 4271746
    Abstract: An electronic automatic musical tuning device whereby an incoming tone from a musical instrument is picked up by a microphone, amplified and transformed to a square wave signal and compared in a phase locked loop with a progressive series of standard frequencies until matching occurs and the loop is locked to enable a display of the tone in a convenient output such as a row of lights.
    Type: Grant
    Filed: February 1, 1980
    Date of Patent: June 9, 1981
    Inventor: John G. Dobbie