Patents by Inventor Archie D. Kirby

Archie D. Kirby 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).

  • Patent number: 4297938
    Abstract: An electronic tuning aid with luminous digital readout adapted by structural and functional features to be operational by placement on the body of string and musical instruments such as the guitar. A shiftable photoelectric probe constituting a unitized component of the device is of an optical character uniquely sensitive to both damped and undamped string vibration of slight amplitude to activate included solid-state counting and translating components affording a numeric display of the frequency of individually selected strings. Steel strings are automatically driven in sustained vibration by an electromagnetic drive system affecting only the selected string and timed by such string in a feedback circuit with the probe.
    Type: Grant
    Filed: September 12, 1979
    Date of Patent: November 3, 1981
    Inventor: Archie D. Kirby