Patents by Inventor Hyok S. Lew

Hyok S. Lew 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: 5700958
    Abstract: An inertia force mass flowmeter comprises at least one conduit under a lateral reciprocating motion with its amplitude distributed along the center line of the conduit in a symmetric or antisymmetric mode about the center section of the conduit, two differential or absolute pressure sensors detecting the alternating transverse pressure gradient existing in the fluid contained in the conduit in directions parallel to the direction of the lateral reciprocating motion of the conduit respectively at two different sections of the conduit respectively included in the two opposite halves of the conduit, and data processing device that determines the mass flow rate of fluid moving through the conduit as a function of an electrical variable related to a phase angle difference between two alternating electrical signals respectively representing the alternating transverse pressure gradient detected respectively at the two different sections of the conduit by the two differential or absolute pressure sensors.
    Type: Grant
    Filed: May 13, 1996
    Date of Patent: December 23, 1997
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5675091
    Abstract: A step-wise tracking electronic filter comprises a parallel bank of a plurality of band pass filters respectively having a plurality of electronic switches and respectively having different band widths, and a command signal generating device generating a command signal from the frequency of a primary alternating electrical signal being transmitted through the step-wise tracking electronic filter and being conditioned thereby or from an auxiliary alternating electrical signal obtained for the sole purpose of generating the command signal therefrom; wherein the command signal closes one of the plurality of electronic switches belonging to one of the plurality of band pass filters having a band width substantially including the frequency of the primary alternating electrical signal and opens the electronic switch when the band width of the band pass filter substantially excludes the frequency of the primary alternating electrical signal in an operating mode wherein only one electronic switch is closed at a time,
    Type: Grant
    Filed: June 8, 1995
    Date of Patent: October 7, 1997
    Inventors: Hyok S. Lew, Yon S. Lew, Hyon S. Lew
  • Patent number: 5663509
    Abstract: An inertia force flowmeter comprises at least one conduit (1), an electromagnetic vibrator (11) generating a transverse reciprocating motion of the conduit (1) and a pair of differential pressure sensors (12 and 13) detecting the fluid pressure gradient in directions parallel to the directions of the transverse reciprocating motion of the conduit (1) respectively at two different sections of the conduit (1), wherein the mass flow rate is determined as a function of phase difference between two alternating electrical signals respectively provided by the two differential pressure sensors (12 and 13).
    Type: Grant
    Filed: September 5, 1995
    Date of Patent: September 2, 1997
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5627325
    Abstract: A position sensor comprises a pair of electrically conducting elongated members having a high ohmic resistance per unit length thereof disposed parallel to one another in a direction defined by the line of displacement of a target member, and a capacitively coupling member disposed adjacent to the pair of electrically conducting elongated members and moving with the target member in the direction of displacement, which capacitively coupling member transmits an alternating electrical signal between the pair of electrically conducting elongated members by a capacitive electrical interaction therebetween, wherein an alternating electrical signal is supplied to the two opposite extremities of one of the pair of electrically conducting elongated members and a phase angle difference between two alternating electrical signals respectively taken off from the two opposite extremities of the other of the pair of electrically conducting elongated members is measured, and the position of the target member is determined a
    Type: Grant
    Filed: June 8, 1995
    Date of Patent: May 6, 1997
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5602344
    Abstract: A inertia force flowmeter comprises a conduit under a lateral reciprocating motion in directions perpendicular to a reference plane defined by the center line of the conduit, and a pair of differential pressure sensors respectively measuring two fluctuating differential fluid pressures resulting from the lateral reciprocating motion of the conduit at two different sections of the conduit, and a motion sensor detecting an amplitude of the reciprocating velocity of the lateral reciprocating motion of the conduit, wherein the mass flow rate of fluid media moving through the conduit is determined from a product of the ratio of the amplitude of the fluctuating differential pressure to the amplitude of the lateral reciprocating velocity of the conduit and a function of the phase angle difference between the two fluctuating differential fluid pressures.
    Type: Grant
    Filed: September 1, 1994
    Date of Patent: February 11, 1997
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5598103
    Abstract: An apparatus for measuring distance between two interfaces comprises a first electrically conductive planar member defining the first of the two interfaces, a second electrically conductive planar member defining the second of the two interfaces, an alternating electrical signal generator supplying an input alternating electrical signal to the first electrically conductive planar member through a first electrical conductor having a high value of ohmic resistance, and a phase difference measuring device measuring a phase angle difference between a first output alternating electrical signal taken off from one extremity of the second electrically conductive planar member through a second electrical conductor having a high value of ohmic resistance and a second output alternating electrical signal taken off from the other extremity of the second electrically conductive planar member or from the alternating electrical signal generator; wherein the distance between the two interfaces is determined as a function of
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: January 28, 1997
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5591923
    Abstract: An electronic filter for conditioning a primary flow signal including alternating electrical signals generated in a flowmeter comprises a parallel bank of low frequency bandpass filters and high frequency bandpass filters, wherein the switching on or off of the individual low frequency bandpass filter is controlled by a command signal generated from an auxiliary flow signal provided by an accessory flowmeter supplying a crude but stable signal representing the level of fluid flow, and the switching on and off of the individual high frequency bandpass filters is controlled by a command signal generated from the frequency of the primary flow signal providing a highly accurate and extremely sensitive signal that represents the time rate of fluid flow.
    Type: Grant
    Filed: June 8, 1995
    Date of Patent: January 7, 1997
    Inventors: Hyok S. Lew, Yon S. Lew, Hyon S. Lew
  • Patent number: 5540106
    Abstract: A method for determining mass flow rate of media moving through at least one conduit under a flexural vibration comprises analyzing two alternating electrical signals respectively representing the flexural vibration of the conduit at two different sections of the conduit, and determining the mass flow rate as a function of an independent variable generated by a ratio between two groups of various combinations of the two alternating electrical signals, which method also provides a method for determining phase angle difference between two alternating electrical signals without actually measuring the lead time or lag time between the two alternating electrical signals in the time domain.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: July 30, 1996
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5509311
    Abstract: A vortex flowmeter employs a differential pressure transducer converting an oscillation in a differential pressure to an alternating electrical signal, which differential pressure transducer is dynamically isolated from a structure including a flow passage in a relationship preventing the transmission of the mechanical vibrations of the structure including the flow passage to the differential pressure transducer, and receives two fluid pressures respectively existing at the two opposite cylindrical sides of a vortex generating bluff body disposed across the flow passage respectively through two small diameter tubings having a low stiffness, wherein the velocity of fluid moving through the flow passage is determined as a function of the frequency of the alternating electrical signal generated by the differential pressure transducer.
    Type: Grant
    Filed: August 1, 1994
    Date of Patent: April 23, 1996
    Inventor: Hyok S. Lew
  • Patent number: 5504789
    Abstract: A phase angle difference between two alternating electrical signals is determined as a function of a ratio of a differential combination of two different numbers of pulse counts to an additive combination of the two different numbers of pulse counts, wherein the first of the two different numbers of pulse counts is obtained by counting a series of electric pulses generated by an electrical pulse generator in a time interval between an occurrence of zero value of the leading signal of the two alternating electrical signal and (i-1)th occurrence of zero value of the trailing signal of the two alternating electrical signals occurring after the occurrence of zero value of the leading signal, and the second of the two different numbers of pulse counts is obtained by counting the pulses in an time interval between an occurrence of zero value of the trailing signal and the (j)th occurrence of zero value of the leading signal occurring after the occurrence of zero value of the trailing signal, wherein (i) and (j) are
    Type: Grant
    Filed: July 15, 1993
    Date of Patent: April 2, 1996
    Inventors: Hyok S. Lew, Yon S. Lew, Yon K. Lew
  • Patent number: 5503021
    Abstract: An oscillatory pressure sensor providing an alternating electrical signal representing an oscillation in differential pressure comprises a piezo electric transducer contained within a cavity included in the sensor body in a compressed relationship between two opposite thin side walls of the cavity, which two opposite thin side walls are respectively connected to deflective portions of two thin deflective partitioning walls respectively constituting a planar barrier between two fluid pressures, wherein the combination of deflective motions of the two thin deflective partitioning walls produced by the differential pressure thereacross induces an alternating stress in a piezo electric disc included in the piezo electric transducer and generates an alternating electrical signal from the piezo electric transducer.
    Type: Grant
    Filed: July 25, 1994
    Date of Patent: April 2, 1996
    Inventor: Hyok S. Lew
  • Patent number: 5501106
    Abstract: A mass flowmeter comprises at least one conduit supported by a frame structure in a relationship allowing an enhanced pivotal vibration about two mutually orthogonal pivot axes, an electromagnetic vibrator generating a primary pivotal vibration of the conduit about one of the two mutually orthogonal pivot axes, and a pair of vibration sensors respectively included in two opposite halves of the conduit respectively located on two opposite sides of a plane including the other of the two mutually orthogonal pivot axes; wherein the mass flow rate of media moving through the conduit is determined as a function of an electrical variable such as the phase angle difference between two alternating electrical signals respectively generated by the pair of vibration sensors, which electrical variable represents the ratio of the amplitude of the secondary pivotal vibration to the amplitude of the primary pivotal vibration.
    Type: Grant
    Filed: November 16, 1993
    Date of Patent: March 26, 1996
    Inventors: Hyok S. Lew, Yon S. Lew, Yon K. Lew
  • Patent number: 5499544
    Abstract: A position sensor comprises a pair of electrically conducting elongated members having a high ohmic resistance per unit length thereof disposed parallel to one another in a direction defined by the line of displacement of a target member, and a capacitively coupling member disposed adjacent to the pair of electrically conducting elongated members and moving with the target member in the direction of displacement, which capacitively coupling member transmits an alternating electrical signal between the pair of electrically conducting elongated members by a capacitive electrical interaction therebetween, wherein an alternating electrical signal is supplied to the two opposite extremities of one of the pair of electrically conducting elongated members and a phase angle difference between two alternating electrical signals respectively taken off from the two opposite extremities of the other of the pair of electrically conducting elongated members is measured, and the position of the target member is determined a
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: March 19, 1996
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5485755
    Abstract: An inertia force or Coriolis force mass flowmeter comprises a pair of conduits having a substantially identical configuration disposed in a parallel and superimposing relationship with a space therebetween and flexurally vibrated relative to one another; wherein each of the pair of conduits has two end sections disposed at a close proximity to one another in a side-by-side relationship and secured to a common region of a supporting structure, and a curved midsection of a loop angle approximately equal to 360 degrees connecting the two end sections of the conduit to one another, which inertia force or Coriolis force mass flowmeter determines mass flow rate of media moving through at least one of the pair of conduits as a function of a phrase angle difference between two alternating electrical signals representing the relative flexural vibration between the pair of conduits respectively at two different sections of the combination of the pair of conduits.
    Type: Grant
    Filed: January 5, 1994
    Date of Patent: January 23, 1996
    Inventor: Hyok S. Lew
  • Patent number: 5477737
    Abstract: A transducer converting an oscillation in fluid pressure into an alternating electrical signal comprises a transducer body including a first pressure compartment disposed intermediate a second and third pressure compartment, and separated by from the second and third pressure compartments respectively by two thin partitioning walls, and a relative vibratory motion sensor detecting the relative vibratory deflection between the two thin partitioning walls, wherein the relative vibratory motion sensor generates an alternating electrical signal representing the oscillation in fluid pressure existing in at least one of two pressures respectively introduced into the first pressure compartment and into the combination of the second and third pressure compartments.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: December 26, 1995
    Inventor: Hyok S. Lew
  • Patent number: 5460053
    Abstract: An electronic data processing method for determining mass flow rate of media moving through a conduit under flexural vibration comprises measuring of a first value of the first electrical signal generated by a first motion sensor located at a section of the conduit, which measurement is made at an instant determined by a triggering device activated by a zero value of the second electrical signal generated by a second motion sensor located at another section of the conduit, and measuring of a second value of the first electrical signal at another instant determined by a triggering device activated by a peak value of the second electrical signal; and determining mass flow rate of the media as a function of ratio between the first and second values of the first electrical signal by using an empirically obtained mathematical relationship that includes a term cancelling out an error introduced by a delay between the cueing of the measurement of the first electrical signal by the second electrical signal and the me
    Type: Grant
    Filed: September 18, 1992
    Date of Patent: October 24, 1995
    Inventors: Hyok S. Lew, Yon S. Lew, Yon K. Lew
  • Patent number: 5456121
    Abstract: A pivotable vane flowmeter comprises at least one pivotable vane disposed pivotably about a pivot axis parallel to the the direction of fluid flow and experiencing a fluid dynamic torque created by the fluid flow, a bias spring or counter-weight providing a bias torque counter-acting the fluid dynamic torque, and a rotary position sensor detecting the rotary position of the pivotable vane about the pivot axis, wherein the dynamic pressure of the fluid flow is determined as a function of the rotary position of the pivotable vane about the pivot axis, and the time rate of the fluid flow is determined from a combination of the dynamic pressure of the fluid flow and the known or measured value of the fluid density, or from another combination of the dynamic pressure of the fluid flow and the frequency of rotation of a rotating turbine or propeller installed in conjunction with the pivotable vane flowmeter.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: October 10, 1995
    Inventors: Hyok S. Lew, Yon S. Lew, Yon K. Lew
  • Patent number: 5456116
    Abstract: A relative vibration sensor includes a transducer container vessel including a cavity surrounded by two parallel deflective walls on two opposite sides and rigid walls on other sides, a piezo electric disc element disposed within the cavity intermediate the two parallel deflective walls, at least two electrodes respectively belonging to two opposite halves of the piezo electric disc element respectively located on two opposite sides of a reference plane intersecting with the two parallel deflective walls of the cavity in a substantially perpendicular relationship, and a pair of elongated vibration sensing members respectively extending from the two parallel deflective walls of the cavity towards an approximately common direction perpendicular to the reference plane, wherein vibrations of two mechanical members respectively transmitted to the pair of elongated vibration sensing members generate two alternating electrical signals respectively from the two opposite halves of the piezo electric disc element, whic
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: October 10, 1995
    Inventor: Hyok S. Lew
  • Patent number: 5455588
    Abstract: A method for determining velocity of a target object comprises transmitting a propagating wave emitted from a wave transmitter and detecting a reflected wave reflected back by the target object by using a wave receiver, and determining of a phase angle difference between two alternating electrical signals respectively representing the transmitted wave departing the wave transmitter and the reflected wave arriving at the wave receiver, wherein the velocity of the target object is determined as a function of the time rate of change of the phase angle difference between the two alternating electrical signals.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: October 3, 1995
    Inventors: Hyok S. Lew, Yon S. Lew
  • Patent number: 5450760
    Abstract: A turbine flowmeter employs a capacitive rotary speed sensor comprising an electrically conductive member with a sizable surface area kinematically coupled to the rotating motion of the turbine, and a pair of stationary electrically conductive members with a sizable area disposed in a side-by-side electrically nonconducting relationship therebetween on a plane closely adjacent to a plane defined by the sizable surface area of the electrically conductive member kinematically coupled to the rotating motion of the turbine, wherein a first alternating electrical signal is supplied to one of the pair of stationary electrically conductive members and a second alternating electrical signal is taken off from the other of the pair of stationary electrically conductive members, and the flow rate of fluid is determined as a function of the frequency of fluctuation of an envelope of the second alternating electrical signal.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: September 19, 1995
    Inventors: Hyok S. Lew, Yon S. Lew, Yon K. Lew