Patents by Inventor Tetsuya Umemura

Tetsuya Umemura 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: 6202168
    Abstract: The delay time for the transfer of data signals between pluralities of logic circuits is automatically regulated to be in a desired range. In order to regulate the delay time of the data signal transfer, a common standard signal SYNC is distributed to the logic circuits from a standard signal generator source. In the sending side of one logic circuit, the standard signal is applied through a selector circuit to a flip-flop circuit and then transferred to the receiving side of another logic circuit. Specifically, the transferred standard signal passes through a variable delay circuit to a flip flop circuit on the receiving side of the other logic circuit where it is compared with the standard signal received from the standard signal generator source, which has passed through a delay circuit of a standard delay value. The result of the comparison is used to adjust the variable delay circuit that controls the delay time for the transferred standard signal.
    Type: Grant
    Filed: July 10, 1998
    Date of Patent: March 13, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Tatsuya Saito, Tetsuya Umemura, Hiroki Yamashita
  • Patent number: 4290806
    Abstract: This invention relates to a copper alloy for reliable electrical connection comprising 0.5-3.0 wt% of Co, 0.03-0.4 wt% of P and the balance being composed of Cu and impurities thereof, which is characterized by that it excels in connecting characteristics relative to connection by compression and particularly does not permit a glow discharge and growth of cuprous oxide.
    Type: Grant
    Filed: September 25, 1979
    Date of Patent: September 22, 1981
    Assignee: Furukawa Metals Company, Ltd.
    Inventors: Sadao Inoue, Tetsuya Umemura, Hiroshi Suzuki, Makoto Tago
  • Patent number: 4269623
    Abstract: This invention relates to a copper alloy for reliable electrical connection comprising 0.5-3.0 wt% of Fe, 0.3-0.8 wt% of Zn and the balance being composed of Cu and impurities thereof, which is characterized by that it excels in connecting characteristics relative to connection by compression and, particularly does not permit a glow discharge and growth of cuprous oxide.
    Type: Grant
    Filed: September 19, 1979
    Date of Patent: May 26, 1981
    Assignee: Furukawa Metals Company, Ltd.
    Inventors: Sadao Inoue, Tetsuya Umemura, Hiroshi Suzuki, Takashi Kuroyanagi