Patents Assigned to Oval Corporation
  • Patent number: 10320377
    Abstract: An instrumentation device having a pulse output function for preventing breakage of a switching element even if a wrong wire is connected. A calculation unit includes: a positive power supply terminal; a negative power supply terminal; a signal terminal; a control circuit; an NPN-type transistor; a feedback circuit; a PTC thermistor; and an N-channel type MOSFET. The NPN-type transistor has a collector terminal connected to the positive power supply terminal, an emitter terminal connected to the negative power supply terminal, and a base terminal connected to the control circuit. The PTC thermistor is a resettable protection element, and is connected in series to the signal terminal. The N-channel type MOSFET has a drain terminal connected to the signal terminal through the PTC thermistor, a source terminal connected to the negative power supply terminal on a downstream side of the feedback circuit, and a gate terminal connected to the control circuit.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: June 11, 2019
    Assignee: OVAL CORPORATION
    Inventors: Tetsushi Kitano, Noriaki Nakayama, Yoshimine Tanabu, Kenji Washio
  • Publication number: 20180262187
    Abstract: An instrumentation device having a pulse output function for preventing breakage of a switching element even if a wrong wire is connected. A calculation unit includes: a positive power supply terminal; a negative power supply terminal; a signal terminal; a control circuit; an NPN-type transistor; a feedback circuit; a PTC thermistor; and an N-channel type MOSFET. The NPN-type transistor has a collector terminal connected to the positive power supply terminal, an emitter terminal connected to the negative power supply terminal, and a base terminal connected to the control circuit. The PTC thermistor is a resettable protection element, and is connected in series to the signal terminal. The N-channel type MOSFET has a drain terminal connected to the signal terminal through the PTC thermistor, a source terminal connected to the negative power supply terminal on a downstream side of the feedback circuit, and a gate terminal connected to the control circuit.
    Type: Application
    Filed: September 14, 2016
    Publication date: September 13, 2018
    Applicant: Oval Corporation
    Inventors: Tetsushi KITANO, Noriaki NAKAYAMA, Yoshimine TANABU, Kenji WASHIO
  • Patent number: 9506793
    Abstract: Provided is a Coriolis flowmeter capable of achieving suppression of a pressure loss of a manifold and the like. A channel (15) of a manifold (8) includes a pipe-side opening portion (16), tube-side opening portions (17), and a channel branching portion (18) as shaping portions therefor, and the channel sectional area in a range of from the channel branching portion (18) toward the tube-side opening portions (17) is linearly decreased. A branching wall tip end (20) of a branching wall (19) extending from a position of the channel branching portion (18) to the other end of a manifold body (12) is arranged at the channel branching portion (18). The sectional shape of the channel (15) is a circular shape at a position of the pipe-side opening portion (16), and is changed to D-shapes at the position of the channel branching portion (18) by the branching wall tip end (20).
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: November 29, 2016
    Assignee: OVAL CORPORATION
    Inventors: Norio Sukemura, Takeshi Motomiya
  • Patent number: 9506801
    Abstract: A prover includes a measurement cylinder; a hydraulic cylinder coupled with a side of a downstream end of the measurement cylinder; a measuring piston that moves through a predetermined distance from an upstream side toward a downstream side through the measurement cylinder to eject a reference volume of fluid; and a piston rod that is movably accommodated in the hydraulic cylinder, and has the measuring piston and the piston rod separately constructed. The prover includes measurement standby position stop means, and when returning the measuring piston to a predetermined measurement standby position, the piston rod moves the measuring piston from the downstream side to the upstream side and the measurement standby position stop means stops the measuring piston at the predetermined measurement standby position, after which only the piston rod is caused to move from the upstream side to the downstream side and is accommodated in the hydraulic cylinder.
    Type: Grant
    Filed: April 18, 2014
    Date of Patent: November 29, 2016
    Assignee: OVAL Corporation
    Inventors: Masahito Yoshimoto, Hajime Iida, Koji Atsumi
  • Publication number: 20150308882
    Abstract: A prover includes a measurement cylinder; a hydraulic cylinder coupled with a side of a downstream end of the measurement cylinder; a measuring piston that moves through a predetermined distance from an upstream side toward a downstream side through the measurement cylinder to eject a reference volume of fluid; and a piston rod that is movably accommodated in the hydraulic cylinder, and has the measuring piston and the piston rod separately constructed. The prover includes measurement standby position stop means, and when returning the measuring piston to a predetermined measurement standby position, the piston rod moves the measuring piston from the downstream side to the upstream side and the measurement standby position stop means stops the measuring piston at the predetermined measurement standby position, after which only the piston rod is caused to move from the upstream side to the downstream side and is accommodated in the hydraulic cylinder.
    Type: Application
    Filed: April 18, 2014
    Publication date: October 29, 2015
    Applicant: OVAL CORPORATION
    Inventors: Masahito YOSHIMOTO, Hajime IIDA, Koji ATSUMI
  • Patent number: 8970124
    Abstract: A photoelectric sensing sensitivity adjusting device includes: an LED for emitting light by being supplied with energy (current or voltage); a regulator for LED driving for supplying the energy to the LED; a light receiving device for receiving the light emitted from the LED; a digital potentiometer for controlling increase or decrease of the energy to be supplied to the LED; a CPU for digitally controlling, according to a control program, the increase or decrease of the energy to be supplied to the LED; and a photodetection portion for detecting an optical signal, converting the optical signal to an electrical signal, and outputting the electrical signal.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: March 3, 2015
    Assignee: Oval Corporation
    Inventors: Tatsumi Kameyama, Noriaki Nakayama, Yoshifumi Endo
  • Patent number: 8915115
    Abstract: A piston prover comprises a measurement cylinder; a hydraulic cylinder coupled with a downstream end of the measurement cylinder; a measuring piston that moves a predetermined distance through the measurement cylinder during a measurement due to a fluid flow to eject a reference volume of fluid; and a piston rod that is movably in the hydraulic cylinder, wherein the measuring piston and the piston rod are separately constructed. When returning the measuring piston to a predetermined upstream measurement standby position, the piston rod moves the measuring piston to set the measuring piston at the predetermined measurement standby position, and thereafter only the piston rod is moved from upstream to downstream and is accommodated in the hydraulic cylinder.
    Type: Grant
    Filed: March 23, 2011
    Date of Patent: December 23, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kuge, Hajime Iida
  • Patent number: 8862434
    Abstract: Provided is a measuring instrument for measuring an object to be measured, including: a CPU (9) including a plurality of internal timer counters and having a function of calculating a measured value of the object to be measured based on detection values of various sensors; a power supply circuit (3) for supplying power to the CPU (9); a detector (4) for detecting a state of the object to be measured; a display unit (5) for displaying detection input data input from the various sensors and the state of the object to be measured, which is obtained through a calculation; a real-time clock IC (RTC) (11) for measuring an elapsed time; an EEPROM (12) for storing data input to the CPU (9); and an FeRAM (13) for storing input values from the various sensors, and storing a calculation result obtained through a calculation performed by the CPU (9) based on the input values from the various sensors.
    Type: Grant
    Filed: October 4, 2010
    Date of Patent: October 14, 2014
    Assignee: Oval Corporation
    Inventors: Shunji Saitoh, Tatsumi Kameyama
  • Patent number: 8725433
    Abstract: A signal processing method, a signal processing apparatus, and a Coriolis flowmeter are capable of always performing measurement with constant precision and performing phase measurement with high filtering performance and a small amount of computation even when a temperature of a fluid to be measured changes, air bubbles are mixed into the fluid to be measured, or the fluid to be measured rapidly changes from a gas to a liquid. The Coriolis flowmeter detects at least one of a phase difference and a vibration frequency proportional to a Coriolis force acting on at least one flow tube or a pair of flow tubes.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: May 13, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Hideki Shimada
  • Patent number: 8725432
    Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: May 13, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Hideki Shimada
  • Patent number: 8700343
    Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion to combine an oscillation frequency to each of two flow rate signals obtained by A/D conversion on input signals of the phase difference and/or the vibration frequency proportional to the Coriolis force acting on the at least one flow tube; measuring a frequency of a composite waveform associated with at least one of the vibration detection sensors; transmitting a control signal based on the measured frequency; controlling so that a sum frequency component or a difference frequency component of a composite component of a composite frequency signal is constant; and measuring phases from a sum signal or a difference signal of each of controlled converted composite frequencies, to thereby obtain a phase difference signal component.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: April 15, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Hideki Shimada
  • Patent number: 8676517
    Abstract: A signal processing method for a Coriolis flowmeter including: performing frequency conversion of a first digital signal, the frequency conversion performed on the first digital signal modulating the frequency of the first digital signal so that the frequency of the first digital signal after the frequency conversion is 1/Nth of the frequency of the first digital signal before the frequency conversion, where N is an integer; performing frequency conversion of a second digital signal, the frequency conversion performed on the second digital signal modulating the frequency of the second digital signal so that the frequency of the second digital signal after the frequency conversion is 1/Nth of the frequency of the second digital signal before the frequency conversion; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: March 18, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Hideki Shimada
  • Patent number: 8676518
    Abstract: A signal processing method for a Coriolis flowmeter, the signal processing method including: measuring a frequency of a first digital signal obtained by converting a first input signal from one of a pair of vibration detection sensors into the first digital signal; transmitting a modulatable frequency signal based on the measured frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of the first digital signal; performing frequency conversion to add or subtract the frequency of the modulatable frequency signal to or from the frequency of a second digital signal obtained by converting a second input signal from the other one of the pair of vibration detection sensors into the second digital signal; and measuring a phase difference between (i) the frequency converted first digital signal and (ii) the frequency converted second digital signal.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: March 18, 2014
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Hideki Shimada
  • Patent number: 8442781
    Abstract: A drive device for operating an electromagnetic oscillator includes an OP amplifier for amplifying an analog input signal from an electromagnetic pick-off and an A/D converter for converting an analog signal output from the OP amplifier into a digital signal. The drive device also includes a D/A converter for converting, after digital processing performed by a DSP on the digital signal output from the A/D converter based on phase detection, a digital signal having a processed data amount into an analog signal, and a D/A converter for converting, after the digital processing performed by the DSP on the digital signal output from the D/A converter based on the phase detection, a digital signal having a processed data amount into an analog signal.
    Type: Grant
    Filed: June 5, 2009
    Date of Patent: May 14, 2013
    Assignee: Oval Corporation
    Inventor: Hideki Shimada
  • Patent number: 8425212
    Abstract: Flowmeter with a pair of helical gears using an oval pitch curve as a reference rack tooth profile. The tooth height ratio of the reference rack tooth profile is ?/4. The reference rack tooth profile is an oval pitch curve of two or less leaves. The moving radius of the oval pitch curve is expressed by ?=a/(1?b cos n?), where ? is a moving radius which is a distance between the center of rotation and the oval pitch curve, “a” is a similarity factor, “b” is a degree of flatness, n (n?2) is the number of leaves, and ? is an argument. The tooth height ratio is h=a/(1?b)?g0, where g0 is a distance between poles of the oval pitch curve and pitch line, wherein g0=a cos ?0/(1?b cos n?0). Values for the similarity factor “a”, degree of flatness “b”, and distance g0 are determined so that the tooth height ratio may be ?m/4.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: April 23, 2013
    Assignee: Oval Corporation
    Inventors: Seigo Ono, Katsuichi Uchida
  • Publication number: 20120255367
    Abstract: Disclosed is a positive displacement gas-liquid two-phase flowmeter and a multi phase flow rate measurement system, and more specifically to a positive displacement gas-liquid two-phase flowmeter capable of measuring a flow rate of each of a gas and a liquid of a gas-liquid two-phase flow including the liquid and the gas flowing in a pipe line and a multiphase flow rate measurement system that includes the flowmeter.
    Type: Application
    Filed: June 16, 2010
    Publication date: October 11, 2012
    Applicant: OVAL Corporation
    Inventors: Hirokazu Kitami, Hiraku Kawaoto
  • Patent number: 8212769
    Abstract: A hierarchical structure display device according to the present invention includes operation condition output means for outputting operation condition information for a switch operation condition of a first switch or a second switch to cause an operator to recognize the operation. condition information, and screen transition means for operating only when a detected switch operation of the first switch or the second switch satisfies the switch operation condition related to the operation condition information output from the operation condition output means to carry out a screen transition of a display screen. Further, the operation condition information is a display image which is displayed within the display screen and repeatedly inverted at predetermined timing during a switch operation, and a necessary number of times of inversion for the switch operation condition is displayed as the display image.
    Type: Grant
    Filed: February 26, 2007
    Date of Patent: July 3, 2012
    Assignee: Oval Corporation
    Inventor: Hirokazu Kitami
  • Patent number: 8184017
    Abstract: A processing method for an operation system which performs operation processing in accordance with a detection amount detected by detection means and pulse output processing in which an operation result from the operation processing is transmitted as a pulse output, including: controlling transmission of the pulse output performed in the pulse output processing to make the transmission of the pulse output asynchronous with a timing of an end of the operation processing; and transmitting, by repeating the controlling, a pulse train having time-series continuity.
    Type: Grant
    Filed: June 21, 2007
    Date of Patent: May 22, 2012
    Assignee: Oval Corporation
    Inventors: Hirokazu Kitami, Shunji Saitoh, Hideki Shimada
  • Patent number: 8069734
    Abstract: A multi-vortex flowmeter includes a vortex type detection device including a measurement tube provided in a flow channel to allow a fluid to be measured to pass, a vortex generator provided in the measurement tube to face a flow of the fluid to be measured, and a vortex detector for detecting a change based on a Karman vortex generated by the vortex generator. The flowmeter also includes a thermal type detection device including a temperature sensor and a heating temperature sensor, each protruding into the flow channel, and a flow rate converter, in which a pressure gauge for measuring a pressure in a pipe wired together with the vortex detector and the thermal detection device is provided integrally with the flow rate converter.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: December 6, 2011
    Assignee: Oval Corporation
    Inventors: Shinji Oda, Kenichi Takai, Kohji Takahashi
  • Patent number: 8051708
    Abstract: A value of a line-to-line resistor (24) is determined by subtracting a resistance value determined as a product of a voltage ratio based on divided voltages and a value of a reference resistor in a non-conductive state between a second electric wire (26) and a third electric wire (27) from a resistance value determined as a product of a voltage ratio based on the divided voltages and the value of the reference resistor in a conductive state therebetween. Once the value of the line-to-line resistor (24) is determined, it becomes possible to determine a compensated resistance value related to temperature.
    Type: Grant
    Filed: October 15, 2008
    Date of Patent: November 8, 2011
    Assignee: Oval Corporation
    Inventor: Hideki Shimada