Patents by Inventor Dorothy E. Hayes

Dorothy E. Hayes 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).

  • Time-variable illuminating device
    Patent number: 4899089
    Abstract: A circuit for controlling the intensity of several illuminating device includes a pulse generator which activates a ring counter. The ring counter activates consecutively one of its outputs in response to pulses from the generator. The ring counter outputs are connected to a wave shaping circuit which activates the illuminating devices in a predetermined manner.
    Type: Grant
    Filed: October 2, 1987
    Date of Patent: February 6, 1990
    Inventor: Dorothy E. Hayes