| Patents for G01H 5 - Measuring propagation velocity of ultrasonic, sonic or infrasonic waves (840) |
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| 01/09/1991 | EP0406915A1 Ultrasonic diagnostic apparatus based on variations of acoustic characteristic |
| 12/18/1990 | US4979151 Method and apparatus for investigating stand-off in a borehole |
| 11/13/1990 | US4970698 Self-calibrating sonar system |
| 10/18/1990 | WO1990012333A1 Acoustic sub-surface interrogator |
| 09/05/1990 | EP0384977A2 Apparatus for measuring propagation time of ultrasounds |
| 07/03/1990 | US4938066 Ultrasonic apparatus for measuring the speed of sound in a gaseous medium |
| 06/12/1990 | US4933911 Method for determining seismic velocities |
| 05/15/1990 | US4926395 Method and system for measuring sound velocity |
| 05/15/1990 | CA1269166A1 Method and apparatus for determining cement conditions |
| 05/08/1990 | US4924449 Acoustic sub-surface interrogator |
| 04/05/1990 | DE3833341A1 Method and device for measuring the transit time of acoustic waves |
| 04/05/1990 | DE3833340A1 Method and device for measuring the transit time of acoustic waves |
| 04/05/1990 | DE3833339A1 Method and device for measuring the transit time of acoustic waves |
| 03/28/1990 | CN2055251U Sound velocity meter |
| 01/25/1990 | WO1990000729A1 Multi-beam tracking for angle error correction in speed of sound estimations |
| 01/02/1990 | US4891587 Magnetic field sensor using variations in ultrasound to determine magnetic field |
| 12/06/1989 | EP0344933A2 Method of determining drill string velocity |
| 11/07/1989 | US4878500 Multi-beam tracking for angle error correction in speed of sound estimations |
| 10/18/1989 | CN2046209U Signal enhancement beam testing analysis instrument |
| 07/11/1989 | CA1257374A1 System and process for measuring ultrasonic velocity |
| 07/04/1989 | US4844082 Ultrasonic examination apparatus |
| 05/16/1989 | US4830015 Method and system for measuring an ultrasound tissue characterization |
| 05/09/1989 | US4829489 Method of determining drill string velocity |
| 04/18/1989 | US4821574 Method and apparatus for measuring ultrasonic velocity by crossed beam |
| 04/04/1989 | US4817615 Ultrasonic temperature measurement apparatus |
| 02/28/1989 | US4807635 Pulse centroid echo method and apparatus for enhanced sound velocity estimation in vivo |
| 01/31/1989 | US4802145 Method and apparatus for determining cement conditions |
| 01/24/1989 | US4800537 Method and apparatus for determining cement conditions |
| 12/06/1988 | US4789969 Method of measuring the anisotropy of propagation or reflection of a transverse wave, particularly a method of geophysical prospecting by measurement of the anisotropy of propagation or of reflection of shear waves in rocks |
| 11/01/1988 | US4781199 System and method for measuring sound velocity of internal tissue in an object being investigated |
| 10/18/1988 | US4777958 Method for enhancing the accuracy of in vivo sound velocity estimation |
| 08/24/1988 | EP0279314A1 Ultrasonic examination apparatus |
| 08/10/1988 | CN87103072A Audiometric method for sound of oil pumping well |
| 08/04/1988 | DE3701982A1 Method of determining average inverse sound velocity |
| 07/05/1988 | US4754839 Well borehole salinity measurement using acoustic velocity |
| 07/05/1988 | US4754760 Ultrasonic pulse temperature determination method and apparatus |
| 06/21/1988 | CA1238236A1 Printing head cassette |
| 04/06/1988 | EP0262879A2 Magnetic field sensor |
| 03/15/1988 | US4730492 Measuring the speed of ultrasound in a moving web of paper |
| 02/24/1988 | EP0256686A1 Method and apparatus for measuring ultrasonic velocity in a medium by crossed beams |
| 02/10/1988 | CN86100574B Sonic velograph for emitting ultrosonic monopulse and modulating wave using the same transistor |
| 01/05/1988 | US4716765 Ultrasonic measuring apparatus |
| 12/12/1987 | CN86210776U Sound wave transducer |
| 12/09/1987 | CN86208963U Electronic organ developed on utilizing organ ic chip |
| 11/25/1987 | CN86100574A Sound velocity meter transmitting ultrasonic monopulse and modulating wave by an identical transitor |
| 11/19/1987 | EP0245980A2 Measuring the speed of ultrasound in a moving web of paper |
| 10/20/1987 | US4700571 Ultrasonic imaging apparatus |
| 09/08/1987 | US4692908 Method and apparatus for investigating stand-off in a borehole |
| 09/08/1987 | CA1226663A1 Ultrasonic diagnostic device |
| 08/25/1987 | US4688423 System and process for measuring ultrasonic velocity |
| 08/04/1987 | US4685075 Apparatus for measuring propagation time of ultrasonic waves |
| 08/04/1987 | US4683752 For determining a property of a liquid |
| 07/28/1987 | US4682497 Ultrasonic imaging apparatus |
| 07/21/1987 | US4680966 Apparatus for examining an object by ultrasonic echography |
| 06/24/1987 | EP0226466A2 Ultrasonic diagnostic apparatus based on variations of acoustic characteristic |
| 06/02/1987 | US4669482 Pulse echo method and apparatus for sound velocity estimation in vivo |
| 05/13/1987 | EP0221409A2 Pulse centroid echo method and apparatus for enhanced sound velocity estimation in vivo |
| 03/31/1987 | US4653505 System and method for measuring sound velocity of tissue in an object being investigated |
| 03/10/1987 | US4649528 Optical pin apparatus for measuring the arrival time and velocity of shock waves and particles |
| 03/03/1987 | CA1218742A1 Method of and device for determining the time-of- flight of an ultrasonic pulse |
| 02/12/1987 | DE3528380A1 Method and device for measuring the propagation time and, if required, the amplitude of acoustic surface waves |
| 01/06/1987 | US4633883 Ultrasonic diagnostic equipment |
| 12/09/1986 | US4627290 Method and apparatus for detecting acoustic homogeneity of object |
| 11/25/1986 | US4624142 Double reference pulsed phase locked loop |
| 10/29/1986 | EP0199624A2 System and process for measuring ultrasonic velocity |
| 09/09/1986 | US4610255 Ultrasonic non-linear parameter measuring system |
| 08/26/1986 | CA1210492A1 Indirect shearwave determination |
| 06/04/1986 | EP0183062A2 Method and apparatus for examining the filling gas of insulating glass sheets |
| 05/27/1986 | US4592030 Method of seismic exploration by acoustic well logging |
| 03/11/1986 | US4575830 Indirect shearwave determination |
| 02/18/1986 | US4571693 Acoustic device for measuring fluid properties |
| 01/21/1986 | US4566084 Acoustic velocity measurements in materials using a regenerative method |
| 01/08/1986 | EP0167338A2 Ultrasonic probe |
| 12/31/1985 | US4562556 Compressional and shear velocity logging method apparatus |
| 12/18/1985 | EP0164808A1 Apparatus for the examination of meda by ultrasonic echography |
| 12/10/1985 | US4558437 Seafloor velocity and amplitude measurement apparatus and method therefor |
| 09/17/1985 | US4541279 Method of determining the time-of-flight of an ultrasonic pulse |
| 08/21/1985 | EP0152113A1 Ultrasonic diagnostic equipment |
| 08/20/1985 | CA1192296A1 Technique for investigating stand-off in a borehole |
| 08/13/1985 | CA1191935A1 Ultrasound measuring of the rate of void in an enclosure |
| 07/10/1985 | EP0147955A2 Ultrasonic non-linear parameter measuring system |
| 06/25/1985 | US4524621 Method for measurement of velocity of surface acoustic wave |
| 06/04/1985 | CA1188402A1 Method of seismic exploration by acoustic well logging |
| 04/30/1985 | US4513749 Three-dimensional temperature probe |
| 01/01/1985 | US4491008 Method of ultrasonic measurement of the ratio of the volume of gas present in an enclosure containing a liquid-gas mixture to the total volume of the enclosure |
| 12/18/1984 | CA1179762A1 Method of determining the ratio of the velocities of compressional and shear waves in subterranean formations |
| 11/21/1984 | EP0125309A1 Three-dimensional temperature probe |
| 10/30/1984 | US4480313 Method of determining sound propagation |
| 10/10/1984 | EP0120886A1 Measurement of ultrasound velocity in tissue |
| 06/05/1984 | US4452081 Measurement of velocity and tissue temperature by ultrasound |
| 06/05/1984 | CA1168747A1 Injection-molded doppler flowmeter transducer assembly |
| 05/24/1984 | WO1984001890A1 Three-dimensional temperature probe |
| 05/23/1984 | EP0109129A1 Method and apparatus for measuring the time-of-flight of an acoustic pulse |
| 05/22/1984 | US4450540 Swept energy source acoustic logging system |
| 05/01/1984 | US4445389 Long wavelength acoustic flowmeter |
| 04/12/1984 | WO1984001432A1 Measurement of ultrasound velocity in tissue |
| 04/10/1984 | US4441367 Apparatus for determining fabric tension |
| 02/07/1984 | US4429994 System for remotely determining velocity of sound in water |
| 01/24/1984 | CA1161151A1 Swept energy source acoustic logging system |
| 12/20/1983 | US4422165 Maximum likelihood estimation of the ratio of the velocities of compressional and shear waves |