Patents by Inventor Katsumi Naitou

Katsumi Naitou 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: 4931807
    Abstract: Disclosed is a non-stationary antenna whose characteristics are guaranteed free of the surrounding variables, such as configuration of the land, electrically conductive condition of the earth's surface, buildings of different heights or climatic changes. The non-stationary antenna has upper and lower antenna conductors decoupled by the capacitors of a resonator arrangement. Thus, if the surrounding variables should cause an adverse effect on the upper antenna conductor, it cannot be transmitted to the lower antenna conductor. Also, the antenna can be bent, and can be held in the bending position until it is straightend with hands. Thus, no matter what posture an associated wireless may take, the antenna can be bent so as to take a vertical posture, which is most appropriate for radiating or receiving electromagnetic waves.
    Type: Grant
    Filed: June 15, 1989
    Date of Patent: June 5, 1990
    Assignee: Nippon Tsushin Densen Company Ltd.
    Inventor: Katsumi Naitou
  • Patent number: 4849767
    Abstract: A helical antenna for use with small portable wireless devices as disclosed which includes a magnetic tuner including a magnet adapted to move in a direction substantially perpendicular to the longitudinal axis of the antenna whereby the impedence of the antenna can be varied greatly by displacement of the magnet only a short distance. The antenna preferably further includes a variable capacitor for reducing any mismatching between the input impedence of the antenna and the characteristic impedence of an associated feeder which can be caused by adjusting the magnetic tuner.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: July 18, 1989
    Assignee: Nippon Tsushin Densen Company, Ltd.
    Inventor: Katsumi Naitou