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| Number | Title | Issue Date |
| 7694551 | Sensor A sensor for measuring a liquid viscosity includes at least one piezo-electrical element in the form of a resonator, at least one first exciting electrode, and a second exciting electrode. At least the first exciting electrode is arranged on the sensitive surface of... | 04/13/2010 |
| 7444245 | Field device for determining and/or monitoring a process variable Field device for determining and/or monitoring at least one process variable of a medium in a container. The field device includes: at least one mechanically oscillatable unit connected with the container via a process connection; and at least one driver/receiver un... | 10/28/2008 |
| 7412877 | High pressure viscometer with chamber preventing sample contamination Viscometer (80) with a rotor (51) rotatable by a coupling magnet (34) and a driving magnet (38) to shear a tested fluid thus imparting torque to a bob (30) mounted on a bob shaft (24) supported via a pair of bob shaft bearin... | 08/19/2008 |
| 7334452 | Method for characterizing materials by using a mechanical resonator Methods for monitoring a fluid composition include placing a mechanical resonator in the fluid composition and oscillating the resonator. The resonator can be a tuning fork resonator having tines oscillated in opposite directions and in opposite phases. A variable f... | 02/26/2008 |
| 7287416 | Low maintenance high pressure viscometer Viscometer (80) with a rotor (51) rotatable by a coupling magnet (34) and a driving magnet (38) to shear a tested fluid thus imparting torque to a bob (30) mounted on a bob shaft (24) supported via a pair of bob shaft bearin... | 10/30/2007 |
| 7257984 | Miniaturized sensor device for detecting characteristics of a fluid, in particular a lubricating oil A miniaturized sensor device comprises at least one pair of active projecting elements or cantilevers, which are set parallel to one another and at a micrometric or sub-micrometric distance apart and are designed to be submerged at least partially in a fluid. Each p... | 08/21/2007 |
| 7191638 | Device for determining and/or monitoring at least one physical parameter and having a piezo-drive for oscillation-excitation and -detection A device for determining and/or monitoring at least one physical parameter of a medium, having at least one mechanically oscillatable unit and at least one drive-/receive unit. The drive-/receive unit excites the oscillatable unit to oscillate, or, it receives the o... | 03/20/2007 |
| 7007546 | Measurement, compensation and control of equivalent shear rate in acoustic wave sensors A method for measuring viscosity and shear rate at which the measurement is performed is provided, by utilizing an acoustic wave sensor, and calculating the shear rate as a function of the characteristic rate of quartz movement in response to a given power transmitt... | 03/07/2006 |
| 6945094 | Viscosity measurement The present invention relates to a method and apparatus of determining the rheological properties of a polymer flowing in a conduit. The invention provides a method of characterising a polymer under test, comprising: Detecting acoustic emissions from said polymer fl... | 09/20/2005 |
| 6938462 | Device for measuring viscosity and/or density A device for measuring the viscosity and/or the density of a fluid using a resonator capable of mechanical vibrations. The resonator is capable of being brought into contact with the fluid. An oscillator circuit is also provided, wherein the oscillator circuit has a... | 09/06/2005 |
| 6904789 | Moisture detection apparatus and method A sensor to detect the presence of water or moisture in bulk materials includes a standard circuit board and a three element transmission line. The sensor electronics include an oscillator responsive to a direct current voltage supply which provides a square wave vo... | 06/14/2005 |
| 6901861 | Ink viscosity measuring device, ink viscosity adjusting method and a device therefor, and a printing apparatus A cardboard sheet printing apparatus including: a rotating body that freely rotates inside an ink circulation passage through which ink flows, and a rotation-imparting assembly which is magnetically coupled with the rotating body outside the ink circulation passage ... | 06/07/2005 |
| 6711942 | Apparatus for determining and/or monitoring the viscosity of a medium in a container The invention relates to an apparatus for determining and/or monitoring the viscosity of a medium in a container, having a unit which can oscillate, having a drive/reception unit and having a control/evaluation unit, in which case the unit which can oscillate is arr... | 03/30/2004 |
| 6691559 | Viscometer A viscometer for measuring liquid viscosities based upon rotational deflections of a suspended bob. The viscometer comprises a deflection indicator, a deflection reader located at a spaced relative position with respect to the indicator, a rotating elemen... | 02/17/2004 |
| 6688162 | Magnetoelastic sensor for characterizing properties of thin-film/coatings An apparatus for determining elasticity characteristics of a thin-film layer. The apparatus comprises a sensor element having a base magnetostrictive element at least one surface of which is at least partially coated with the thin-film layer. The thin-fil... | 02/10/2004 |
| 6668621 | Viscosity measurement by means of damped resonant vibration normal to an approximate rigid plate A brief but intense magnetic impulse generated by a coil 42 is used to excite resonant bending mode vibration in a magnetically permeable cantilevered beam 2 immersed in a fluid 22. A permanent magnet 36 and a magnetically permeable circuit 44, 38, 40, 56... | 12/30/2003 |
| 6602714 | Viscosity and mass sensor for the high-throughput synthesis, screening and characterization of combinatorial libraries Workstation, apparatuses and methods for the high-throughput synthesis, screening and/or characterization of combinatorial libraries. The invention relates to an array, which permits various high-throughput methods for synthesis, screening and/or characte... | 08/05/2003 |
| 6494079 | Method and apparatus for characterizing materials by using a mechanical resonator A method and apparatus for measuring properties of a fluid composition in a conduit includes a mechanical resonator connected to a measurement circuit. The measurement circuit provides a variable frequency input signal to the mechanical resonator, causing... | 12/17/2002 |
| 6463793 | Extended range Scanning Brookfield techniques Physical property of a liquid sample to include a viscometric and/or rheological property if not a structural property such as gelation and/or crystallization can be determined with a rotating viscometer employed in a Scanning Brookfield technique. The vi... | 10/15/2002 |
| 6397661 | Remote magneto-elastic analyte, viscosity and temperature sensing apparatus and associated methods of sensing An analyte, viscosity, or temperature sensing apparatus for operative arrangement within a time-varying magnetic field, including a sensor with an outer surface that is chemically, frictionally, or thermally responsive and adhered to a base magnetostricti... | 06/04/2002 |
| 6286361 | Method and apparatus for remotely detecting pressure, force, temperature, density, vibration, viscosity and speed of sound in a fluid An apparatus for detecting pressure in a hollow fan blade of a turbofan gas turbine engine comprises a magnetostriction transducer arranged in a sub chamber of the fan blade which is interconnected to a main chamber. A magnetic coil is arranged in the fan... | 09/11/2001 |
| 6192744 | Robust transducer for viscoelastic measurement A transducer for use in a viscoelastic analyzer of the type in which a mechanical probe member is immersed in a fluid or gel and driven to impart a desired oscillating motion to such fluid or gel whose viscoelastic properties are to be determined includin... | 02/27/2001 |
| 5895842 | Robust transducer for viscoelastic measurement A transducer for use in a viscoelastic analyzer of the type in which a mechanical probe member is immersed in a fluid or gel and driven to impart a desired oscillating motion to such fluid or gel whose viscoelastic properties are to be determined includin... | 04/20/1999 |
| 5837885 | Method and device for measuring the characteristics of an oscillating system A resonator (1) is vibrating close to its resonance frequency. The vibration is excited by one or a first transducer (2) connected to an oscillator (11). The vibration is measured by the transducer (2) or a second transducer (3) and stabilized by a phase-... | 11/17/1998 |
| 5710374 | Electronic viscometer An electronic viscometer having a vibrating drive in a hollow probe which oscillates along its longitudinal axis and is damped by a sample into which the probe is inserted. The viscometer has a piezoelectric crystal having a feedback electrode, a phase lo... | 01/20/1998 |
| 5571952 | Electronic viscometer An electronic viscometer having a vibrating drive and a hollow probe. The hollow probe oscillates along its longitudinal axis, and is damped by a sample into which it is inserted.... | 11/05/1996 |
| 5565620 | Method for measuring rheological properties and rheometer for carrying out the method In a method of measuring rheological properties of a sample, an oscillation system containing the sample is caused to perform free oscillations, and the damping caused by the sample is determined, the rheological properties of the sample being possible to... | 10/15/1996 |
| 5533381 | Conversion of liquid volume, density, and viscosity to frequency signals Volume of a working liquid in a sensing chamber is measured via a first mechanical resonance frequency. A second resonance may be measured to discriminate interacting volume and density effects, yielding corrected volume, density, and liquid mass. A proba... | 07/09/1996 |
| 5349848 | Consistency measuring apparatus including elastomeric member for improved reliability An elastomeric member is disposed in the enlarged opening of an on-line consistency measuring apparatus through which the blade carrier support shaft extends, and the elastomeric member is operative to prevent the solid-liquid slurry of a pulp stock slurr... | 09/27/1994 |
| 5317908 | High viscosity transducer for vibratory viscometer A transducer for inline process control of highly viscous fluids at high pressure and high temperature having a torsionally oscillating sensor tip supported by a pressure resistant threaded body portion. The sensor tip, which includes a thermocouple to me... | 06/07/1994 |
| 5301540 | Probe for measuring the viscosity of liquids A probe for measuring the viscosity of small quantities of liquids is described. The probe for measuring the viscosity of liquids, including a housing having a surface, a first end point, and a second end point, the housing having a first, a second, and a... | 04/12/1994 |
| 4811593 | Viscosity detector A viscosity detector includes an electromechanical vibrator having a central axis and capable of vibrating about the central axis, a transmission shaft having one end thereof connected coaxially to the vibrator, and a detector member connected coaxially t... | 03/14/1989 |
| 4679427 | Apparatus for measuring viscosity An apparatus for measuring the viscosity of a viscous substance as a sample to be measured has a tuning fork type vibrator having two vibrating plates opposing to each other at a distance. These vibrating plates are vibrated at equal frequencies in invers... | 07/14/1987 |
| 4668911 | Apparatus for making non-contact angular deflection measurements An angular displacement indicating apparatus includes internal and external magnets disposed so that the external magnet tracks the internal magnet when a shaft to which the internal magnet is connected rotates. The external magnet is connected to a rotar... | 05/26/1987 |
| 4602505 | Apparatus for measuring viscosity An apparatus for measuring the viscosity of a viscous substance as a sample to be measured has a tuning fork type vibrator having two vibrating plates opposing to each other at a distance. These vibrating plates are vibrated at equal frequencies in invers... | 07/29/1986 |
| 4488427 | Rotational vibratory viscometer transducer and circuit A torsional mode rotational vibratory viscometer having an elastic hollow metal sheath extending below a support plate and secured to the plate by a weld. A rigid rod is disposed within the sheath and welded to the lower end of the sheath. An immersible t... | 12/18/1984 |
| 4328701 | Apparatus for determining the behavior of a liquid during coagulation and the like An apparatus for measuring or observing parameters representative of the coagulation and/or the lysis of a coagulable liquid, such as blood, comprises a torsion thread, a driving body supported by the torsion thread to be dipped in the liquid, a vessel co... | 05/11/1982 |
| 4177434 | Constant amplitude control of electromechanical oscillators Method and system for the constant amplitude control of an electromechanical oscillator utilizing a phase locked oscillator to generate a secondary a-c setpoint which is compared to the oscillator output to provide a difference signal which is passed as a... | 12/04/1979 |
| 4148216 | Apparatus for determining the viscous behavior of a liquid during coagulation thereof A thromboelastographic apparatus comprises a body suspended to a resilient tape and immersed in operation in a liquid to be studied. The liquid is received in a receptacle which is oscillated about the axis of the tape with a predetermined frequency and a... | 04/10/1979 |
