Patents by Inventor Robert A. McEwan

Robert A. McEwan 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).

  • Boosted D.C. supply circuit and luminaire employing same
    Patent number: 4752719
    Abstract: A luminaire using a tungsten-halogen lamp, includes a circuit for supplying the lamp with a boosted D.C. operating voltage. The circuit includes a full-wave rectifying circuit for receiving a standard A.C. mains supply voltage, and a low pass filter connected to the output of the rectifier. The value of the time constant of the filter is chosen to produce at the rectifier output, an average D.C. voltage of about between 135 and 146 volts, preferably about 140 volts.
    Type: Grant
    Filed: September 1, 1987
    Date of Patent: June 21, 1988
    Inventor: Robert A. McEwan