Patents by Inventor Takao Fukuhara

Takao Fukuhara 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).

  • Intake vacuum control device for internal combustion engine
    Patent number: 4361127
    Abstract: An internal combustion engine is provided with an intake vacuum control device through which the upstream and downstream sides of an intake passageway with respect to a throttle valve are communicable with each other, so that additional air is supplied to the intake passageway downstream of the throttle valve during engine deceleration. The intake vacuum control device is composed of a valve member which is normally biased to be closed by a coil spring which is guided by a cylindrical guide member.
    Type: Grant
    Filed: August 26, 1980
    Date of Patent: November 30, 1982
    Assignee: Nissan Motor Company, Limited
    Inventors: Takao Fukuhara, Yoshio Iwasa
  • Belt drive connection malfunction sensor
    Patent number: 4263578
    Abstract: An A.C. voltage picked up from the alternator driven by an internal combustion engine is converted into a pulse train signal so that the number of the pulses is counted for a period of time defined by a reference timing signal produced in synchronization with the rotation of the crankshaft of the engine. When the number of the pulses reaches a predetermined value during the period of time, a counter produces an output signal to indicate that the slipping rate of the belt is within a tolerance. On the other hand, when the number of pulses is less than the predetermined number, the counter does not produce an output signal (indicating that the slipping rate is over the tolerance). The output of the counter may be averaged over a plurality of measuring times.
    Type: Grant
    Filed: June 4, 1979
    Date of Patent: April 21, 1981
    Assignee: Nissan Motor Company, Limited
    Inventors: Takao Fukuhara, Kunihiro Saito
  • Intake vacuum control device for internal combustion engine
    Patent number: 4237842
    Abstract: An internal combustion engine is provided with an intake vacuum control device through which the upstream and downstream sides of an intake passageway with respect to a throttle valve are communicable with each other, so that additional air is supplied to the intake passageway downstream of the throttle valve during engine deceleration. The intake vacuum control device is composed of a valve member which is normally biased to be closed by a coil spring which is guided by a cylindrical guide member.
    Type: Grant
    Filed: October 4, 1978
    Date of Patent: December 9, 1980
    Assignee: Nissan Motor Company, Limited
    Inventors: Takao Fukuhara, Yoshio Iwasa
  • Exhaust gas recirculation control device
    Patent number: 3931813
    Abstract: An orifice and a valve to maintain the ratio of recirculated exhaust gas to engine intake air at an optimum level.
    Type: Grant
    Filed: July 25, 1973
    Date of Patent: January 13, 1976
    Assignee: Nissan Motor Company Limited
    Inventors: Masakazu Horie, Takao Fukuhara, Tetsuya Harada