Patents by Inventor Masaaki Nikkuni

Masaaki Nikkuni 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).

  • Patent number: 7333901
    Abstract: The present invention intends to provide a small, low-cost, convenient transmitter system. The transmitter system detects physical quantities, converts the physical quantities into electrical signals, and allows the electrical signals to be transmitted to a load through a transmission line, comprising a main output circuit to be connected to a main instrumentation power supply and at least one subordinate output circuit to be connected to a subordinate instrumentation power supply.
    Type: Grant
    Filed: March 16, 2005
    Date of Patent: February 19, 2008
    Assignee: Yokogawa Electric Corporation
    Inventor: Masaaki Nikkuni
  • Patent number: 7124239
    Abstract: A memory updating system for a field device involves a fieldbus, one or more field devices that incorporate a nonvolatile memory and are connected to the fieldbus, a host system that is directly or indirectly connected to the fieldbus and transmits an updating instruction and updating data to one of the field devices in order to update the nonvolatile memory of the field device, and a current control circuit that controls a current provided from the fieldbus. The current control circuit increases the current provided from the fieldbus to a value greater than a normal value before the field device erases data stored in the nonvolatile memory, and returns the current provided from the fieldbus to the normal value after the field device completes the erasing of the data stored in the nonvolatile memory.
    Type: Grant
    Filed: December 8, 2004
    Date of Patent: October 17, 2006
    Assignee: Yokogawa Electric Corporation
    Inventors: Yoji Saito, Seiichiro Takahashi, Satoru Ochiai, Masaaki Nikkuni
  • Patent number: 6979995
    Abstract: A time difference signal having a pulse width corresponding to the time difference between an output of a resonant pressure sensor and a reference clock is prepared. The pulse width of the time difference signal is expanded by a given magnification. Based on a count value obtained by counting the reference clock during the expanded pulse width and a count value obtained by counting the reference clock during one cycle of the output of the resonant pressure sensor or a period which is integer times as long as the one cycle, the output frequency of the resonant pressure sensor is obtained. It is possible to obtain the fast processing and the high resolution without increasing the frequency of the reference clock.
    Type: Grant
    Filed: September 5, 2003
    Date of Patent: December 27, 2005
    Assignee: Yokogawa Electric Corporation
    Inventors: Yasuaki Horio, Masaaki Nikkuni, Masahiko Moriya, Hiroki Yoshino
  • Publication number: 20050216217
    Abstract: The present invention intends to provide a small, low-cost, convenient transmitter system. The transmitter system detects physical quantities, converts the physical quantities into electrical signals, and allows the electrical signals to be transmitted to a load through a transmission line, comprising a main output circuit to be connected to a main instrumentation power supply and at least one subordinate output circuit to be connected to a subordinate instrumentation power supply.
    Type: Application
    Filed: March 16, 2005
    Publication date: September 29, 2005
    Applicant: YOKOGAWA ELECTRIC CORPORATION
    Inventor: Masaaki Nikkuni
  • Publication number: 20050137719
    Abstract: A memory updating system for a field device involves a fieldbus, one or more field devices that incorporate a nonvolatile memory and are connected to the fieldbus, a host system that is directly or indirectly connected to the fieldbus and transmits an updating instruction and updating data to one of the field devices in order to update the nonvolatile memory of the field device, and a current control circuit that controls a current provided from the fieldbus. The current control circuit increases the current provided from the fieldbus to a value greater than a normal value before the field device erases data stored in the nonvolatile memory, and returns the current provided from the fieldbus to the normal value after the field device completes the erasing of the data stored in the nonvolatile memory.
    Type: Application
    Filed: December 8, 2004
    Publication date: June 23, 2005
    Inventors: Yoji Saito, Seiichiro Takahashi, Satoru Ochiai, Masaaki Nikkuni
  • Publication number: 20040075425
    Abstract: The present inventions overcomes a drawback that although it is necessary to increase frequency of a reference clock to perform the measurement of output frequency of a resonant pressure sensor speedily with high resolution, the increase of frequency gives rise to an increase of the power consumption and hence, the use of a two-wire differential pressure/pressure transmitter is difficult. A time difference signal having a pulse width corresponding to the time difference between an output of a resonant pressure sensor and a reference clock is prepared. The pulse width of the time difference signal is expanded by a given magnification. Based on a count value obtained by counting the reference clock during the expanded pulse width and a count value obtained by counting the reference clock during one cycle of the output of the resonant pressure sensor or a period which is integer times as long as the one cycle, the output frequency of the resonant pressure sensor is obtained.
    Type: Application
    Filed: September 5, 2003
    Publication date: April 22, 2004
    Applicant: YOKOGAWA ELECTRIC CORPORATION
    Inventors: Yasuaki Horio, Masaaki Nikkuni, Masahiko Moriya, Hiroki Yoshino