Patents by Inventor Kaoru Koyanagi

Kaoru Koyanagi 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).

  • Semiconductor defects curing method and apparatus
    Patent number: 4725558
    Abstract: An improved semiconductor defects curing method and apparatus are disclosed which is free from current leakage due to pin-holes or other defects. Also an improved method for processing a semiconductor device is shown. According to the invention, the gaps or holes in the semiconductor layer produced in the fabrication process are filled with insulator in advance of deposition of electrodes.
    Type: Grant
    Filed: November 6, 1986
    Date of Patent: February 16, 1988
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Kunio Suzuki, Mikio Kinka, Takeshi Fukada, Masayoshi Abe, Ippei Kobayashi, Katsuhiko Shibata, Masato Susukida, Susumu Nagayama, Kaoru Koyanagi
  • Liquid crystal filling device
    Patent number: 4691995
    Abstract: An improved liquid crystal filling device is shown. Prior to joining a substrate with another substrate between which the liquid crystal is to be charged, the liquid crystal is dropped on the substrate and then the other substrate is superimposed on the substrate under pressure. Sandwiched between the substrates, the liquid crystal spreads at high temperature.
    Type: Grant
    Filed: July 15, 1986
    Date of Patent: September 8, 1987
    Assignee: Semiconductor Energy Laboratory Co., Ltd.
    Inventors: Shunpei Yamazaki, Toshimitsu Konuma, Toshiji Hamatani, Akira Mase, Kaoru Koyanagi, Shinji Imato, Toshiharu Yamaguchi, Mitsunori Sakama, Takashi Inujima
  • Control apparatus for a synchronous machine
    Patent number: 4329637
    Abstract: A shaft torsional oscillation signal of a rotatable torsional system including a rotor of a synchronous machine, at least one rotatable body and a shaft coupling the synchronous machine and the rotatable body, is detected. The shaft torsional oscillation signal with a specific frequency is made to advance the phase thereof by a stabilizing control device. The field voltage of the synchronous machine is so controlled that a sub-synchronous resonance (SSR) of the rotatable torsional system caused by the specific frequency is restrictedly controlled by the shaft torsional signal of the specific frequency phase-advanced.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: May 11, 1982
    Assignees: Tokyo Denryoku Kabushiki Kaisha, Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Tosio Kotake, Katuaki Watanabe, Kaoru Koyanagi