Patents by Inventor Nobuyuki Ishitsuka

Nobuyuki Ishitsuka 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).

  • SOLENOID VALVE DRIVE CONTROL APPARATUS AND METHOD FOR DRIVING A SOLENOID VALVE
    Publication number: 20090237856
    Abstract: A solenoid valve drive control apparatus includes a MOSFET connected in series with the drive coil of a solenoid valve, a varistor connected in parallel with the drive coil, and a diode connected in parallel with the drive coil and the MOSFET. Due to the MOSFET being turned OFF, because the varistor immediately becomes conductive when a back EMF is generated in the drive coil, an electric current caused by the back EMF flows through a closed circuit constituted by the drive coil and the varistor.
    Type: Application
    Filed: February 5, 2009
    Publication date: September 24, 2009
    Applicant: SMC Kabushiki Kaisha
    Inventors: Nobuyuki ISHITSUKA, Fumio Morikawa
  • Input-output unit for serial-parallel signal conversion
    Patent number: 6704815
    Abstract: An input-output unit for serial-parallel conversion has a simple structure and is capable of controlling various devices to be drive-controlled by a serial signal together or transmitting output signals from various sensors to a control system together by converting them into serial signals. For this purpose, the input-output unit has plural input-output blocks in series for inputting control signals into the various devices for transmitting output signals from the various devices, via an input-output connector, and a relay block having a serial terminal to be connected to the control system and a signal converter for converting between serial signals transmitted to and from the control system and parallel signals transmitted to and from the input-output blocks via a multipolar joint connector to be connected to each input-output block.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: March 9, 2004
    Assignee: SMC Corporation
    Inventors: Fumio Morikawa, Nobuyuki Ishitsuka, Shinji Miyazoe
  • Method of driving and controlling a solenoid-operated valve
    Patent number: 6636782
    Abstract: A method of driving and controlling a solenoid-operated valve is provided. The solenoid-operated valve can be centrally controlled and managed and it is possible to easily respond to any system change.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: October 21, 2003
    Assignee: SMC Kabushiki Kaisha
    Inventors: Fumio Morikawa, Nobuyuki Ishitsuka
  • Method and device for managing operation of solenoid valve
    Patent number: 6386229
    Abstract: The present invention aims to permit an easy and reliable predicting of abnormality of a solenoid valve before failure, by detecting operating times of the solenoid valve and discriminating, from the operating times, whether the changeover operation thereof is normal or abnormal.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: May 14, 2002
    Assignee: SMC Corporation
    Inventors: Fumio Morikawa, Nobuyuki Ishitsuka, Makoto Ishikawa
  • Method of driving and controlling a solenoid-operated valve
    Publication number: 20020035414
    Abstract: A method of driving and controlling a solenoid-operated valve is provided. The solenoid-operated valve can be centrally controlled and managed and it is possible to easily respond to any system change.
    Type: Application
    Filed: September 17, 2001
    Publication date: March 21, 2002
    Inventors: Fumio Morikawa, Nobuyuki Ishitsuka
  • Signal converter
    Patent number: D448344
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: September 25, 2001
    Assignee: SMC Kabushiki Kaisha
    Inventors: Nobuyuki Ishitsuka, Ken Gunji
  • Signal-input device
    Patent number: D433998
    Type: Grant
    Filed: March 23, 2000
    Date of Patent: November 21, 2000
    Assignee: SMC Kabushiki Kaisha
    Inventors: Nobuyuki Ishitsuka, Ken Gunji