| Patents for G01H 13 - Measuring resonant frequency (1,015) |
|---|
| 11/23/1989 | DE3815800A1 Arrangement for measuring a gas density |
| 11/01/1989 | CN1005676B Meter and measurement of harmonic distortion under great power of louderspeaker |
| 09/13/1989 | EP0331671A1 Self-oscillating, optical resonant sensor |
| 09/08/1989 | WO1989008336A1 Plate-mode ultrasonic sensor |
| 08/22/1989 | US4859830 Method of determining the weldability of a part |
| 08/15/1989 | US4858130 Estimation of hydraulic fracture geometry from pumping pressure measurements |
| 07/04/1989 | US4844585 Optically excited vibratile transducer |
| 06/20/1989 | US4841256 Piezoelectric phase locked loop circuit |
| 05/16/1989 | US4829823 Apparatus for detecting defects, particularly in castings |
| 04/19/1989 | CN1032455A Method and apparatus for determining resonant frequency of turbing blade made of material not responsive to magnetic field |
| 03/28/1989 | US4816743 Measuring method |
| 02/02/1989 | DE3723933A1 Verfahren zum erfassen einer kleinflaechigen, nahezu punktfoermigen und weitgehend kraeftefreien beruehrung zwischen einer sonde und einem festen gegenstand, sowie beruehrungsdetektor A method for detecting a kleinflaechigen, almost punktfoermigen and largely kraeftefreien contact between a probe and a fixed object, and beruehrungsdetektor |
| 01/31/1989 | CA1249664A1 Apparatus and method for testing wooden poles |
| 01/31/1989 | CA1249655A1 Method and device for detecting a specific acoustic spectral feature |
| 01/26/1989 | WO1989000677A1 Self-oscillating, optical resonant sensor |
| 01/26/1989 | WO1989000672A1 Process for detecting a nearly pinpoint, essentially force-free contact of small area between a probe and a solid object, and contact detector |
| 01/24/1989 | US4799498 Apparatus for detecting the resonant frequency of a bone |
| 10/11/1988 | US4776216 Programmable jet blade excitation system |
| 10/05/1988 | EP0284678A1 A device and method for monitoring small displacements of a peak in a frequency spectrum |
| 09/07/1988 | CN88100992A Programmable jet blade excitation system |
| 08/18/1988 | DE3802138A1 Nachweissystem fuer materialfehler Detection system for material errors |
| 08/09/1988 | US4761993 Method for monitoring the operation of an internal combustion engine |
| 08/02/1988 | US4761743 Dynamic system analysis in a vibrating beam accelerometer |
| 06/22/1988 | EP0272244A2 Method and device for determining vibration characteristics and for driving a piezoelectric transducer |
| 05/11/1988 | EP0266485A2 Electromechanical horn with excitation of its acoustic diaphragm controlled electronically by sensors which measure its resonance frequency |
| 03/29/1988 | US4733561 Self-oscillating, optical resonant sensor |
| 02/24/1988 | CN85100572B Static electricity stimulator |
| 02/16/1988 | CA1232775A1 Fluid density measurement apparatus and method |
| 02/03/1988 | CN87105179A Self-oscillating optical resonant sensor |
| 01/27/1988 | EP0253829A1 Apparatus for detecting defects, particularly in castings |
| 01/20/1988 | CN87103307A Resonant piezo-ceramic sensor termitarium probe |
| 11/07/1987 | CN86210604U Mechanical laser strobovibration controlling meter |
| 10/21/1987 | EP0241781A1 Operating supervision method for a running internal-combustion engine |
| 07/28/1987 | US4682490 Impact test instrument |
| 07/16/1987 | WO1987004250A1 Apparatus for detecting defects, particularly in castings |
| 05/07/1987 | DE3539156A1 Method and device for measuring density in media by means of oscillations of high frequency stability |
| 02/03/1987 | US4640130 Method and apparatus for acoustically measuring the volume of an object |
| 12/16/1986 | US4629977 Method and apparatus for measuring the resonant frequency of a high Q resonator |
| 12/01/1986 | EP0111482A4 Apparatus for trimming of piezoelectric components. |
| 08/12/1986 | US4604896 For the Jj-69 engine |
| 07/02/1986 | CN85100572A Static electricity stimulator |
| 05/14/1986 | EP0181131A2 Apparatus for detecting the resonant frequency of a bone |
| 04/22/1986 | CA1203614A1 Sonic resonator control and method for determining component concentration in multiple component liquid |
| 03/11/1986 | US4574639 Gas density/pressure transducer |
| 02/10/1986 | CN85100620A Meter and measurement of harmonic distortion under great power of iouderspeaker |
| 11/12/1985 | CA1196706A1 Fiber optic sensor |
| 06/18/1985 | US4523467 Method and apparatus for resonant sensing device |
| 06/11/1985 | US4522620 Method and apparatus for measuring the quantity of solid material in a centrifuge cylinder |
| 06/04/1985 | US4521684 Optical measurement system with light-driven vibrating sensor element |
| 02/19/1985 | CA1182660A1 Apparatus to measure yarn tension |
| 01/02/1985 | EP0129753A1 Gas density transducer apparatus |
| 09/05/1984 | EP0117571A1 A device for controlling the feed state of a textile thread supplied to a weaving machine |
| 08/21/1984 | US4467235 Surface acoustic wave interferometer |
| 07/11/1984 | EP0113031A2 Apparatus for testing the purity of noble metal shaped bodies |
| 07/10/1984 | CA1170477A1 Method to measure yarn tension |
| 06/27/1984 | EP0111482A1 Apparatus for trimming of piezoelectric components |
| 05/08/1984 | US4447301 Immersion of resonator in electrolyte, transducer, and wave generator to detect frequencies which correspond to alumina concentration |
| 05/08/1984 | US4446733 Stress control in solid materials |
| 05/01/1984 | US4445322 Apparatus to measure yarn tension |
| 02/15/1984 | EP0100501A2 Vibration sensor |
| 02/14/1984 | CA1162276A1 Stepper motor load tuning |
| 01/05/1984 | WO1984000081A1 Apparatus for trimming of piezoelectric components |
| 11/01/1983 | US4412452 Harmonic oscillator for measuring dynamic elastic constants of rock materials |
| 10/18/1983 | US4409837 Method for measuring the resonance of rock material |
| 10/05/1983 | EP0090167A2 Fiber-optic sensor for a resonant element |
| 07/19/1983 | US4393725 Apparatus to measure yarn tension |
| 06/28/1983 | US4389891 System for measuring resonance frequencies in turbine and compressor vanes and propeller blades |
| 05/31/1983 | US4385520 Strain and phase detection for rock materials under oscillatory loading |
| 03/15/1983 | US4376368 Method to measure yarn tension |
| 02/15/1983 | CA1141195A1 Method for measuring crack propagation in samples, and a high frequency pulsator for carrying out the method |
| 12/14/1982 | US4363242 Pulsed phase locked loop strain monitor |
| 11/11/1982 | WO1982003915A1 Method and device for measuring the tension of a moving a wire |
| 09/21/1982 | US4350043 Airfoil vibration test apparatus |
| 09/08/1982 | EP0059567A1 Method to measure yarn tension |
| 08/10/1982 | US4343301 Subcutaneous neural stimulation or local tissue destruction |
| 07/28/1982 | EP0056772A1 Apparatus for monitoring resonance |
| 07/20/1982 | CA1127873A1 Crankshaft damper resonance monitor |
| 06/22/1982 | CA1126387A1 Fault detection device |
| 06/08/1982 | US4333344 System and method for testing the reaction of rare earth ions |
| 04/07/1982 | EP0048806A1 Stepper motor load tuning |
| 03/30/1982 | US4322806 Frequency response analyzer |
| 03/09/1982 | US4318625 Stepper motor load tuning |
| 02/09/1982 | CA1118089A1 Hot spot temperature sensor |
| 12/30/1981 | EP0042780A1 Apparatus for measuring the resonance frequency of turbine, compressor and propeller blades |
| 12/29/1981 | US4307610 Method for measuring crack propagation in samples, and a high frequency pulsator for carrying out the method |
| 11/17/1981 | US4300383 Crankshaft damper resonance monitor |
| 06/16/1981 | CA1103311A1 Pseudo continuous wave instrument |
| 03/24/1981 | US4257747 Monitoring machinery by detecting vibrations |
| 03/17/1981 | US4257001 Resonant circuit sensor of multiple properties of objects |
| 03/17/1981 | US4255964 Fluid monitor |
| 08/19/1980 | US4217912 Device for determination of the mechanical characteristic frequency of blood vessels, tendons, bones or similar organs in a body |
| 06/24/1980 | CA1080343A1 Coil and microphone mounting for frequency correction in mechanical resonators |
| 04/01/1980 | US4195528 Fault detection device |
| 03/11/1980 | US4193010 Sensor device using piezoelectric coating subjected to bending |
| 01/09/1980 | EP0006580A1 Measuring method for the registration of variations in a sample of a material |
| 08/21/1979 | US4165033 Identification system |
| 05/15/1979 | CA1054679A1 Automatic measurement and display of resonance frequencies of seismic detection elements |
| 03/21/1979 | EP0001127A1 Apparatus comprising a generator for mechanical vibrations of adjustable frequenz and a receptor of vibrations for determining the natural frequency of blood vessels or tendons in a live body |
| 02/13/1979 | CA1048606A1 Apparatus for automatic adjustment of frequency of mechanical resonators |
| 01/23/1979 | CA1047113A1 Apparatus for automatic adjustment of frequency of mechanical resonators |