Patents by Inventor Ogden L. Presholdt

Ogden L. Presholdt 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).

  • Method and apparatus for separately controlling sky wave and ground wave radiation from a medium wave antenna
    Patent number: RE33276
    Abstract: In one embodiment, a horizontal antenna mounted electrically separated from but near the top of a vertical antenna. For a given wattage and frequency and for two stations separated a known distance apart, the proscribed angle of elevation for ionospheric reflection for each station can be computed. The current and phase of the signal applied to the horizontal antenna can be adjusted to cancel the electromagnetic field waves emitted from the vertical antenna in the selected azimuth and angle of elevation. The cancellation effects waves of a certain angular orientation at the proscribed angle of elevation for ionospheric reflection.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: July 24, 1990
    Inventor: Ogden L. Presholdt