Patents by Inventor Robert H. Redfield

Robert H. Redfield 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).

  • Digital stroboscope-tachometer
    Patent number: 4117395
    Abstract: A stroboscope which generates high intensity light flashes may be manually adjusted to the speed of a rotating object and provides an indication of the speed of the rotating object in revolutions per minute. Connection of an external synchronizing unit into the stroboscope automatically disables the manually-controlled oscillator and substitutes synchronizing control pulses derived from a rotating object which is to be synchronized, these control pulses occurring at a frequency which is sixty times the frequency of the rotating object.
    Type: Grant
    Filed: May 9, 1977
    Date of Patent: September 26, 1978
    Assignee: Power Instruments, Inc.
    Inventor: Robert H. Redfield