Patents by Inventor Ryuji Tohyama

Ryuji Tohyama 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).

  • Flow rate-measuring device
    Patent number: 6561021
    Abstract: A flow rate-measuring device capable of measuring accurately a flow rate of fluid to be measured containing a drift or eddy as compared with a conventional device is provided. A flow rate-measuring passage 11 for measuring a flow rate of the fluid to be measured is constructed so that its opening area in an upstream region communicating to an inlet 111 gradually decreases from upstream to downstream. A flow rate-detecting element 31 is disposed near an outlet in the flow rate-measuring passage 11. The device is provided with a leak flow passage 18 allowing a part of the fluid which has flown in from the inlet 111 of the flow rate-measuring passage 11 to leak out of the flow rate-measuring passage 11 at a portion upstream from an outlet 112 of the flow rate-measuring passage 11, in particular upstream from a position where the flow rate-detecting element 31 is disposed.
    Type: Grant
    Filed: April 23, 2001
    Date of Patent: May 13, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Hiroyuki Uramachi, Fumiyoshi Yonezawa, Naruki Suetake, Ryuji Tohyama, Tomoya Yamakawa, Shingo Hamada, Takeharu Oshima
  • Flow rate-measuring device
    Publication number: 20020043103
    Abstract: A flow rate-measuring device capable of measuring accurately a flow rate of fluid to be measured containing a drift or eddy as compared with a conventional device is provided.
    Type: Application
    Filed: April 23, 2001
    Publication date: April 18, 2002
    Inventors: Hiroyuki Uramachi, Fumiyoshi Yonezawa, Naruki Suetake, Ryuji Tohyama, Tomoya Yamakawa, Shingo Hamada, Takeharu Oshima
  • Heat-sensitive type flow sensor
    Patent number: 6205854
    Abstract: A heat-sensitive type flow sensor which can be manufactured by using discrete parts at low cost in a miniature size with high accuracy and reliability includes a correcting circuitry capable of compensating for a detected current indicating a flow rate of a fluid of concern and outputted from a flow rate detecting circuit.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: March 27, 2001
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Ryuji Tohyama, Naruki Suetake
  • Constant voltage circuit comprising temperature dependent elements and a differential amplifier
    Patent number: 6181192
    Abstract: A constant voltage circuit having excellent temperature characteristics at a wide temperature range. Temperature characteristics control means constructed by connecting a voltage dividing circuit formed by connecting fixed resistors in series to a diode in parallel is provided between a fixed resistor and a Zener diode having a positive temperature coefficient of a bridge circuit, and the output of a connection point between the fixed resistors of the temperature characteristics control means is applied to the non-inversion input terminal of a differential amplifier to correct the temperature change of the Zener diode.
    Type: Grant
    Filed: November 17, 1999
    Date of Patent: January 30, 2001
    Assignee: Mitsubishi Denki Kaibushiki Kaisha
    Inventors: Ryuji Tohyama, Naruki Suetake, Minoru Abe