Patents by Inventor Kazuma Ohkura

Kazuma Ohkura 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).

  • Controller for power bipolar transistor
    Patent number: 5818284
    Abstract: A base current controlling circuit for a power bipolar transistor comprising a first controlling device giving the base current only two states which are a "conduction" state and a "cut-off" state, and a second controlling device adjusting the condition of the power bipolar transistor to a predetermined preferable condition by controlling the base current value in response to a result of detection of a condition of the power bipolar transistor.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: October 6, 1998
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Yoshinori Murakami, Kazuma Ohkura, Yasuhiko Kitajima, Kazuhiko Tani
  • Analog-to-digital converter having decreased reference voltage to reduce display flicker
    Patent number: 5119097
    Abstract: A parallel comparison type A/D converter having a hysterisis is disclosed in which a reference voltage level for comparing with an input analog signal is switched according to a digital converted signal so that the output digital value has a hysterisis characteristic with respect to the input analog signal. Thus, no flickers or chattering in a displayed segment of a display unit occurs when the input analog signal has a value in close to one of the reference voltages to be compared.
    Type: Grant
    Filed: August 11, 1988
    Date of Patent: June 2, 1992
    Assignee: Nissan Motor Company, Limited
    Inventors: Kazuma Ohkura, Masahiro Ishikawa