Patents by Inventor Nobuyoshi Tsuboi

Nobuyoshi Tsuboi 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).

  • Optical information apparatus and method of recording and erasing information
    Patent number: 4718053
    Abstract: The present invention employs as a recording medium a metal or alloy which exhibits an intercrystalline transition before and after writing. In the present invention, two light beams of unequal wavelengths are used so as to write information with the light beam of the longer wavelength and to erase information with the light beam of the shorter wavelength. In changing a written content, a wavelength with which the reflection rate of the recording medium increases is used.
    Type: Grant
    Filed: November 6, 1985
    Date of Patent: January 5, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yoshio Sato, Satoshai Shimada, Hiroshi Sasaki, Norifumi Miyamoto, Nobuyoshi Tsuboi, Hideki Nihei, Ryuji Watanabe, Atsumi Watanabe, Tetsuo Ito, Hiroaki Koyanagi
  • Control apparatus for passenger conveyor
    Patent number: 4499986
    Abstract: A control apparatus for a passenger conveyor driven by a three-phase induction motor which is capable of being put selectively into a star-connection or a delta-connection mode. A load of the conveyor is detected on the basis of a current and a voltage supplied to the induction motor, so that when the load is large the motor is driven in the delta-connection mode while when the load is small the motor is driven in the star-connection mode so as to save the power consumption of the conveyor when the load is small.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: February 19, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Nobuyoshi Tsuboi, Seiya Shima, Morio Kanasaki, Hayashi Nakazawa