Patents by Inventor Muneharu Yamakawa

Muneharu Yamakawa 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).

  • Pump provided with diaphragms
    Patent number: 6764287
    Abstract: A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are respectively inserted into the grooves to form a plurality of pump chambers. An actuator actuates the diaphragms to compress or decompress the pump chambers.
    Type: Grant
    Filed: August 1, 2002
    Date of Patent: July 20, 2004
    Assignee: Mitsumi Electric Co., Ltd.
    Inventor: Muneharu Yamakawa
  • Pump provided with diaphragms and an eccentric rotation shaft
    Patent number: 6716005
    Abstract: In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator is formed with a first hole having a first diameter, which is arranged eccentrically from a rotation center of the rotator, and a second hole having a second diameter smaller than the first diameter, which is formed in a bottom of the first hole. A shaft member connects the rotator and the pivotable member so as to convert a rotation of the rotator into a pivotal movement of the pivotable member for sequentially deforming each diaphragm to vary a volume of each pressure chamber. One end of the shaft member is fitted into the second hole.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: April 6, 2004
    Assignee: Mitsumi Electric Co., Ltd.
    Inventor: Muneharu Yamakawa
  • Pump provided with diaphragms
    Publication number: 20030068242
    Abstract: In a pump, a plurality of pump chambers are defined by a plurality of diaphragms. A pivotable member is attached to the diaphragms. A rotator is formed with a first hole having a first diameter, which is arranged eccentrically from a rotation center of the rotator, and a second hole having a second diameter smaller than the first diameter, which is formed in a bottom of the first hole. A shaft member connects the rotator and the pivotable member so as to convert a rotation of the rotator into a pivotal movement of the pivotable member for sequentially deforming each diaphragm to vary a volume of each pressure chamber. One end of the shaft member is fitted into the second hole.
    Type: Application
    Filed: September 25, 2002
    Publication date: April 10, 2003
    Inventor: Muneharu Yamakawa
  • Pump provided with diaphragms
    Publication number: 20030031571
    Abstract: A casing body is formed with a vent hole. The casing body has an inner face formed with a plurality of grooves respectively communicated with the vent hole. A plurality of diaphragms are respectively inserted into the grooves to form a plurality of pump chambers. An actuator actuates the diaphragms to compress or decompress the pump chambers.
    Type: Application
    Filed: August 1, 2002
    Publication date: February 13, 2003
    Inventor: Muneharu Yamakawa