Patents by Inventor Keiichi Murakawa

Keiichi Murakawa 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).

  • VOLTAGE DETECTION CIRCUIT, CHARGE CONTROL CIRCUIT, CHARGE AND DISCHARGE CONTROL CIRCUIT, AND SEMICONDUCTOR DEVICE
    Publication number: 20230318315
    Abstract: A voltage detection circuit, a charge control circuit, a charge and discharge control circuit, and a semiconductor device are provided. The voltage detection circuit includes: an input port; a plurality of transistors connected in series and including at least an input transistor including a gate connected to the input port, a source connected to a first power supply terminal, and a drain, and a first transistor including a drain connected to a second power supply terminal, a gate, and a source connected to the gate of the first transistor; and an output port configured to be one of connection points of the plurality of transistors.
    Type: Application
    Filed: March 17, 2023
    Publication date: October 5, 2023
    Applicant: ABLIC Inc.
    Inventors: Shinya FUKUCHI, Yasuhiro MIYAMOTO, Keiichi MURAKAWA
  • Gas dissolved water producing apparatus and method thereof and ultrasonic cleaning equipment and method thereof
    Patent number: 6921063
    Abstract: A gas dissolved water producing apparatus includes a gas dissolving section, a gas channel for guiding a gas into the dissolving section, a first water channel for guiding water into the dissolving section, a gas dissolved water discharge channel, and a second water channel for guiding the water without passing through the dissolving section. The second water channel joins the gas dissolved water discharge channel to control the solution gas dissolved in the gas dissolved water can be controlled to a prescribed level of concentration.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: July 26, 2005
    Assignee: Ebara Corporation
    Inventors: Suguru Ozawa, Ryoichi Shinjo, Minoru Harada, Takayuki Saito, Kenichi Sasaki, Keiichi Murakawa, Kazuhide Shimamura
  • Gas dissolved water producing apparatus and method thereof and ultrasonic cleaning equipment and method thereof
    Publication number: 20050150515
    Abstract: A gas dissolved water producing apparatus includes a gas dissolving section, a gas channel for guiding a gas into the dissolving section, a first water channel for guiding water into the dissolving section, a gas dissolved water discharge channel, and a second water channel for guiding the water without passing through the dissolving section. The second water channel joins the gas dissolved water discharge channel to control the solution gas dissolved in the gas dissolved water can be controlled to a prescribed level of concentration.
    Type: Application
    Filed: February 28, 2005
    Publication date: July 14, 2005
    Inventors: Suguru Ozawa, Ryoichi Shinjo, Minoru Harada, Takayuki Saito, Kenichi Sasaki, Keiichi Murakawa, Kazuhide Shimamura
  • Gas dissolved water producing apparatus and method thereof and ultrasonic cleaning equipment and method thereof
    Publication number: 20040012104
    Abstract: The object of the present invention is to provide a gas dissolved water producing apparatus which can produce a gas dissolved water 31 having a concentration of a dissolved solution gas 3 not greater than a saturated concentration rapidly and efficiently.
    Type: Application
    Filed: December 19, 2002
    Publication date: January 22, 2004
    Inventors: Suguru Ozawa, Ryoichi Shinjo, Minoru Harada, Takayuki Saito, Kenichi Sasaki, Keiichi Murakawa, Kazuhide Shimamura