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| Number | Title | Issue Date |
| 7400265 | Remotely readable gas meter and method of using the same A sensing device for remotely reading the position of the needles of a gas meter. The gas meter having a plurality of meter needles. The sensing device including directional magnetic field emitters each having a north and a south pole that are spaced from one anothe... | 07/15/2008 |
| 7337675 | Method for measuring average velocity pressure and system thereof A method for measuring average velocity pressure of a stack comprises the following steps. First, a total pressure measuring device is provided. The total pressure measuring device then measures the total pressure at a first location in the stack. Next, physical par... | 03/04/2008 |
| 7242182 | Position sensor and corresponding method for detecting the position of a rotating element A low-wear sensor with little structural outlay to detect a combined linear and rotational movement, such as in a print roller (10). In one embodiment, a PLCD (Permanent Magnetic Linear contactless Displacement) sensor includes a magnet (5) which can b... | 07/10/2007 |
| 6909669 | Scour detection and monitoring apparatus adapted for use in lossy soils and method of employment thereof A sensor for detecting and monitoring scour in sediment positioned beneath a body of water, which includes a probe at least partially embedded in the sediment. Sensor electronics are superimposed on the probe. Such electronics include a reflectometer, a battery supp... | 06/21/2005 |
| 6906628 | Varying field electronic tag detection system The invention concerns a system for detecting multiple tags in a detection zone. The system includes an electronic tag detection system having first and second field generators, each having a respective antenna for generating an electromagnetic field in a detection ... | 06/14/2005 |
| 6747573 | Apparatus and method for generating coded high-frequency signals An apparatus and method for generating coded high-frequency signals, having a converter, which converts non-electrical primary energy available from the surroundings into electrical energy, an element with a nonlinear characteristic curve, which is coupled to the co... | 06/08/2004 |
| 6529140 | Magnetic bi-dimensional position sensor A bi-dimensional position sensor that can be advantageously used in the turn system controlled from the steering wheel of a vehicle. The sensor includes a permanent magnet fixed to a control lever so as to move in a plane along first and second directions... | 03/04/2003 |
| 6486655 | Magnetic position sensing techniques A method of sensing the position of a first element with respect to a second element is disclosed, the first element being movable with respect to the second. The method comprises: (a) fixing a first magnetic marker to said first element; (b) fixing a sec... | 11/26/2002 |
| 6380735 | Orthogonal flux-gate type magnetic sensor A magnetic sensor of orthogonal flux-gate type is provided with a cylindrical core made of a soft magnetic material; an internal conductor that is placed inside the core; a detection coil wound up on the core; and an external conductor that is placed arou... | 04/30/2002 |
| 6218831 | Low power fluxgate circuit with current balance The present invention is a system for cyclically driving an electrical current through at least one non-linear (i.e., saturable) inductor in alternating directions so as to produce a substantially periodic current waveform, and for producing an output sig... | 04/17/2001 |
| 6181235 | Rotary apparatus A rotary apparatus in which at least one electrically controlled device is attached to a rotor. The rotor carries coils such that rotation of the rotor generates power for the device. A switch is provided for controlling the supply of power to the device ... | 01/30/2001 |
| 6118271 | Position encoder using saturable reactor interacting with magnetic fields varying with time and with position A position encoder is provided for indicating the relative position between first and second relatively movable members. One of the members carries a multi-pole magnetic scale which generates a magnetic field whose magnitude and direction vary with positi... | 09/12/2000 |
| 6084393 | Scour probe assembly A scour probe assembly comprises an elongated rigid tubular member of eleically insulative material, an anchoring structure fixed to a distal end of the tubular member, and a signal transmission device mounted on the tubular member. A pair of substantial... | 07/04/2000 |
| 5880677 | System for monitoring and controlling electrical consumption, including transceiver communicator control apparatus and alternating current control apparatus A system that monitors and controls electrical power consumption that will be retrofitted to a typical consumer electrical power arrangement (typical arrangement-electrical feed line from a provider, a meter, a circuit breaker and individual input wiring ... | 03/09/1999 |
| 5532687 | Modular magnetic scour monitoring device and method for using the same A modular scour monitoring device which employs magnets located within a weighted descending collar is designed for placement about bridge piers, abutments and the like, such that the occurrence of scour causes descent of the collar. This descent is caref... | 07/02/1996 |
| 5497147 | Differential variable reluctance transducer The novel differential variable reluctance transducer and telemetry system is comprised of a ultra miniaturized device encased in stainless steel. The system contains a free sliding, magnetically permeable, stainless core and two coils surrounding the cor... | 03/05/1996 |
| 5196845 | Antenna for tire monitoring device An antenna to be used with transponder type devices. The antenna includes an inductance and a capacitor forming a resonant circuit. To avoid any heating and to have a sufficiently broad passband or operating range, there is in parallel with the inductance... | 03/23/1993 |
| 5160886 | Permanent magnet resolver for producing a resolver-to-digital converter compatible output A simplified magnetic resolver for measurement of rotary or linear position which comprises a permanent magnet rotor and two pairs of sensing coils. The resolver produces sine and cosine outputs compatible with known resolver-to-digital converters.... | 11/03/1992 |
| 5151695 | Telemetric measuring device with high power generation A telemetric measuring device for measuring physical conditions of machinery having a periodically moving part. The device generates its own power with power generator that uses the periodic motion of the machinery to move a reciprocator slug inside a coi... | 09/29/1992 |
| 4950988 | Two region, remanently magnetized position sensor A position sensor and method for detecting and providing an indication of the position of a movable member comprising a ferromagnetic element oriented substantially parallel to the path of travel of the movable member, the element including a segment ther... | 08/21/1990 |
| 4914389 | Multiturn shaft position sensor with backlash compensation The present invention is a shaft position sensor for detection of the position of a multiturn shaft. The rotation of the multiturn shaft is converted into a linear motion via a multiturn screw and two axially spaced non-rotating nuts which are oppositely ... | 04/03/1990 |
| 4912406 | Device for determining position of a railway vehicle by measuring deviation in position of a magnet Apparatus including a magnet (10) having at least one degree of freedom w respect to a first member, tangent to the direction of measurement and cooperating with a magnetic portion associated with a second member, and a sensor (11) for picking up the pos... | 03/27/1990 |
| 4841246 | Multiturn shaft position sensor having magnet movable with nonrotating linear moving nut The present invention is a shaft position sensor for detection of the position of a multiturn shaft. The rotation of the multiturn shaft is converted into a linear motion via a multiturn screw and a nonrotating nut. A magnet is mounted on the nonrotating ... | 06/20/1989 |
| 4774465 | Position sensor for generating a voltage changing proportionally to the position of a magnet A sensor for identifying the position of a test object has a strip-shaped core of low magnetic coercivity which is magnetized with opposite polarities by two excitation coils disposed at opposite ends of the core, and a secondary coil wrapped around the c... | 09/27/1988 |
| 4717873 | Magnetic displacement transducer system having a magnet that is movable in a tube whose interior is exposed to a fluid and having at least one magnetometer outside the tube A magnetic displacement transducer system for measuring the movement of a member includes an elongated permanent magnet which is mechanically coupled to the member so that the magnet moves parallel to its axis. A magnet-position sensor assembly, which inc... | 01/05/1988 |
| 4639667 | Contactless controllers sensing displacement along two orthogonal directions by the overlap of a magnet and saturable cores A multi-directional contactless controller senses the displacement of a manipulator with respect to a reference frame along two orthogonal directions and also indicates rotation of the manipulator with respect to the reference frame. The manipulator is jo... | 01/27/1987 |
| 4619288 | Adjustable transducer and lock mechanism for monitoring valve position A lost-motion connection is provided between the armature core of a valve position sensor and the valve plunger preventing relative rotation therebetween while permitting relative axial movement by rotation of an adjuster sleeve having threaded engagement... | 10/28/1986 |
| 4529961 | Tire pressure sensor and sensing system A wheel-mounted tire pressure sensor employs a Bourdon tube which deforms in relation to tire pressure to drive a pivotal arm. Opposite ends of the arm support magnets which can close reed switches arrayed around the path of travel of the magnets. The ree... | 07/16/1985 |
| 4507601 | Lever stroke control A manual controller for producing an output signal for control of hydraulic valves and the like. The controller has a quadrant lever consisting of an inner tube connected to a shaft and an outer tube slidable thereover. The inner tube has a palm rest at i... | 03/26/1985 |
| 4455555 | Control transducer An inductive displacement transducer includes a primary and at least two secondary coils with a movable coupling member for varying the amount of mutual coupling therebetween as a function of the displacement of a movable member. The secondary coils are w... | 06/19/1984 |
| 4371116 | Variable reactance alignment detector and control An alignment system with a variable reactance element is provided for detection of the angular alignment of two variably positionable members. The variable reactance elements form two oppositely varying impedances. A preferred embodiment of the variable r... | 02/01/1983 |
| 4309702 | Displacement detecting apparatus Apparatus for detecting the displacement of a member having a magnetic scale on which are provided calibrating signals of a predetermined wavelength. First and second magnetic heads are disposed to reproduce the calibrating signals from the magnetic scale... | 01/05/1982 |
| 4266732 | Variable reactance alignment detector and control An alignment system with a variable reactance element is provided for detection of the angular alignment of two variably positionable members. The variable reactance elements form two oppositely varying impedances. A preferred embodiment of the variable r... | 05/12/1981 |
| 4193301 | Flow meter A flow-meter having a sliding lamina interposed between two chambers and movable to vary the flow therethrough in response to deviations in the pressure difference between the chambers to maintain a constant preset pressure difference for accurate measure... | 03/18/1980 |
| 4156223 | Positional transducer utilizing magnetic elements An improved positional transducer is disclosed which utilizes an elongated, hollow, cylindrical tube of a magnetically saturable material, a sense wire that runs through the tube parallel to its elongated axis and a pair of elongated, generally rectangula... | 05/22/1979 |
| 4121185 | Linear position sensor An improved linear position sensor that utilizes a pair of elongated magnetically permeable tubular sensing elements and a pair of elongated magnets positioned to move with respect to the tubular sensing elements is disclosed. The sensor is provided with ... | 10/17/1978 |
| 4099164 | Sensors for sensing a plurality of parameters Sensors, or transducers, which utilize elongated magnetically saturable tubes with sense lines that run through the tubes for simultaneous sensing of a plurality of parameters are disclosed. One version involves a single sensing element which has a first ... | 07/04/1978 |
| 4064497 | Sensors for sensing a plurality of parameters Sensors, or transducers, which utilize elongated magnetically saturable tubes with sense lines that run through the tubes for simultaneous sensing of a plurality of parameters are disclosed. One version involves a single sensing element which has a first ... | 12/20/1977 |
| 4045787 | Sensors for sensing a plurality of parameters Sensors, or transducers, which utilize elongated magnetically saturable tubes with sense lines that run through the tubes for simultaneous sensing of a plurality of parameters are disclosed. One version involves a single sensing element which has a first ... | 08/30/1977 |
| 4013945 | Rotation sensor for borehole telemetry A rotation sensor and output signal processing apparatus is presented. The rotation sensor is a ring core flux gate magnetometer whose output varies as a function of the earth's magnetic field. The phase angle of the second harmonic of the magnetometer ou... | 03/22/1977 |
