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| Number | Title | Issue Date |
| 8050010 | Method and an apparatus for controlling glow plugs in a diesel engine, particularly for motor-vehicles A method is provided that includes, but is not limited to the steps of driving in an on-off manner in a period of time an electronic switch in series with a respective glow plug between the terminals of a d.c. voltage supply, sensing the glow plug voltage and the gl... | 11/01/2011 |
| 7370528 | System for detecting the level of liquid in a tank The detecting system comprises a detecting circuit (1) made up of a transistor (T1) in current generator configuration, connected in series with a resistance (Rs) and a capacitor (13) of known capacitance (Cx), the resistance Rs representing the... | 05/13/2008 |
| 7363811 | Measurement pickup A measurement pickup is provided offering a high measure of safety and having a measurement pickup housing, a sensor element arranged in the measurement pickup, at least one connection element closing the measurement pickup housing, and an excess-pressure protection... | 04/29/2008 |
| 7337662 | Electrostatic capacity type liquid state detecting sensor An electrostatic capacity type liquid state detecting sensor includes an outer tubular electrode, and an inner electrode disposed within the outer tubular electrode and having an insulation layer at an outer surface portion to be brought into contact with liquid con... | 03/04/2008 |
| 7323886 | Linear capacitance measurement and touchless switch Capacitance measurement apparatus that enhances the sensitivity and accuracy of capacitive transducers, proximity sensors, and touchless switches. Each of two capacitors (C1, C2) under measurement has one end connected to ground and is kept at substant... | 01/29/2008 |
| 7284427 | Self-calibrating liquid level transmitter The present disclosure generally relates to a capacitance sensing apparatus equipped with self-calibrating capacity and method of use thereof. The disclosure contemplates the determination using a secondary means of precise fluid levels according to five possible em... | 10/23/2007 |
| 7281414 | Apparatus, a method, and measuring sensors for scanning states of engine oil The present invention relates to an apparatus, a method, and a sensor for scanning engine oil of a vehicle. An apparatus for scanning engine oil according to an exemplary embodiment of the present invention includes an oil property measuring part for measuring physi... | 10/16/2007 |
| 7255002 | Tank seal for guided wave radar level measurement A microwave level gauge for measuring a level of a process material in a tank includes a ceramic seal and a microwave conductor. The ceramic seal is disposed adjacent to an opening in the tank and adapted to isolate circuitry from the process material. The microwave... | 08/14/2007 |
| 7254008 | Integrated capacitive microfluidic sensors method and apparatus A microfluidic device and method for capacitive sensing. The device includes a fluid channel including an inlet at a first end and an outlet at a second end, a cavity region coupled to the fluid channel, and a polymer based membrane coupled between the fluid channel... | 08/07/2007 |
| 7162922 | Non-invasive method for detecting and measuring filling material in vessels A non-invasive method for measuring the level of filling material in a vessel and for detecting the presence of the filling material in the vessel at a predetermined set point level is based on monitoring the oscillation of the vessel's outside wall that follows an ... | 01/16/2007 |
| 7158363 | Liquid metal varactor and method A varactor includes a container forming a liquid chamber, a first electrode mounted adjacent the chamber, and a second electrode mounted adjacent the chamber. The chamber may be sized and configured, and a spacing between the electrodes and the chamber may be select... | 01/02/2007 |
| 7107837 | Capacitance fluid volume measurement A fluid volumetric pumping system has a fluid pump and capacitor plates disposed around a pump chamber of the fluid pump. The capacitance between the capacitor plates changes as the volume of fluid in the pump chamber changes. An electrical circuit measures a change... | 09/19/2006 |
| 7100441 | Method and apparatus for monitoring liquid levels within a vessel An apparatus for monitoring the level of a liquid in a vessel comprises at least one metallic probe hermetically sealed within the vessel, the probe having a sealing end and at least a portion of the probe constituting a first electrode, the sealing end of the probe... | 09/05/2006 |
| 7100856 | Thread spool and bobbin holder The invention is a combination spool and bobbin holder having essentially separate sections for the spool and the bobbin. The color of the thread is visible on both the spool and the bobbin for selection purposes and to ensure that the correct bobbin is stored with ... | 09/05/2006 |
| 7088567 | Tunable capacitors using fluid dielectrics Capacitors (10,20,40,50,70,80) having a fluid dielectric material that is transported or undergoes a phase change are disclosed. The dielectric medium change results in a change in the total dielectric constant of the material between the electrodes (12, 1... | 08/08/2006 |
| 7064560 | Liquid state detecting element and liquid state detecting sensor A liquid state detecting element comprising: a film portion made of a flexible insulating material and extending in a longitudinal direction; and a pair of detecting electrodes juxtaposed to each other on a layer of said film portion and extending in said longitudin... | 06/20/2006 |
| 7010985 | Gauge for measuring fuel level in a tank, and a system for measuring the weight of fuel in the tank The gauge comprises concentric inner and outer tubes made of insulating material, with two capacitors each constituted by a set of electrodes, each set having at least one pair of two electrodes in strip form extending along the gauge and placed facing each other on... | 03/14/2006 |
| 6904821 | Level measuring instrument and procedure for its inserting into a container A filling level measurement device and a process for its insertion into a tank. The tank has a passage opening leading from the outside of the tank through the tank wall to the inside of the tank, and the filling level measurement device is introduced into the passa... | 06/14/2005 |
| 6823730 | Capacitive fill level measurement device A capacitive fill level measurement device with a fill level sensor having a plurality of sensor fields, electrical wires for electrically connecting the plurality of sensor fields to a multipole side of a selector switch, and a power supply and evaluation circuit e... | 11/30/2004 |
| 6799458 | Oil level/condition sensor An oil level/condition sensor includes a first level sensing tube, a common tube, and a second level sensing tube. The tubes are concentric to each other around a central axis. Moreover, the tubes are separated by plastic spacers which insulate the level sensing tub... | 10/05/2004 |
| 6776900 | Level measurement for grease separators An interceptor for removing grease from an effluent stream containing grease and water may be queried remotely to check it status. An output signal indicative of the amount of grease is transmitted over a telephone line to a telephone or computer or other remote sta... | 08/17/2004 |
| 6542350 | Reservoir volume sensors Reservoir volume in a drug delivery device is sensed by providing a capacitor, the capacitance of which varies with bellows position or, alternatively, with the amount of propellant liquid absorbed in a dielectric material. In one embodiment, a capacitanc... | 04/01/2003 |
| 6490920 | Compensated capacitive liquid level sensor A fringing-field capacitive liquid level sensor comprising an electrically insulating substrate, having a first and a second pattern of conductive capacitance plates plated on the substrate. Each pattern constitutes a fringing-field capacitor having a cap... | 12/10/2002 |
| 6423213 | Continuous level measurement for grease separator An automatic draw-off grease interceptor 10 includes a separation tank 12 defining a chamber 40. An inlet 24 delivers an effluent stream of grease and water into the chamber which separates into a thicken layer of grease atop a water layer. A pump 70 is i... | 07/23/2002 |
| 6318172 | Capacitive level detector with optimized electrode geometry The subject matter of the present invention is the optimization of a capacitive liquid level sensor which is suitable, in particular, for determining the location of a boundary layer 12 between water 10 and oil 11 in a separator tank. The known sensor pri... | 11/20/2001 |
| 6295869 | Capacitive measurement probe for measuring the level of a liquid and tank equipped with such a probe Capacitive measurement probe (6) for measuring the level of a liquid in a tank (1), of the type comprising a body (7) for mounting the probe and a first plate (8) which is supported by the body and is intended, together with a second plate (41), to form a... | 10/02/2001 |
| 6293144 | Method and device for monitoring the consumption of a product, for example a printing ink, using a low-pass filter In order to monitor the consumption of a normally electrically conductive product contained in a storage chamber of a reservoir made of electrically non-conductive material, the storage chamber is disposed in a capacitive arrangement and a measurement pro... | 09/25/2001 |
| 6278381 | Fault condition protective device for aircraft fuel gauging system A fault protective device (48) for limiting the maximum current and voltage applicable to electronic components and wiring (26, 30) located in the fuel tank (10) of an aircraft. Particularly, a fuel gauging system circuit (18) extends from a generator (20... | 08/21/2001 |
| 6250152 | Sensor arrangement A sensor arrangement determines a condition and level of a liquid in a container. A first sensor has first electrodes forming a first measuring chamber communicating with the liquid and supplies a signal for determining an impedance of the first sensor an... | 06/26/2001 |
| 6247363 | Method and device for determining a quantity of consumable product present in a reservoir and a document printing device implementing this method Determination of the quantity of consumable product present in a reservoir, for example the quantity of ink present in the reservoir of an inkjet printing device. According to the invention, the movable reservoir can be engaged in the dielectric space of ... | 06/19/2001 |
| 6178818 | Capacitive filling level sensor A capacitive filling level sensor has a first capacitive sensor element arranged close to a fluid whose filling level is to be detected, a second capacitive sensor element arranged close to a fluid whose filling level is to be detected, and a switched-cap... | 01/30/2001 |
| 5917264 | Electrostatic capacitance type transducer and method for producing the same The present invention provides an electrostatic capacitance type transducer and a method for producing the same, with the ensured sufficient connecting strength and insulation between a movable electrode and a fixed electrode and smooth production. In the... | 06/29/1999 |
| 5790422 | Method and apparatus for determining the quantity of a liquid in a container independent of its spatial orientation A sensor apparatus is described that detects and indicates the quantity of cryogenic liquid in a Dewar container independent of the spatial orientation and physical motions acting on the Dewar container. The sensor apparatus comprises a first conductor, p... | 08/04/1998 |
| 5740594 | Method for making a fluid pressure transducer A capacitive fluid pressure transducer is shown formed of a monolithic ceramic body (10) having a cavity located between a diaphragm portion (12) and a base portion (14). Opposed capacitor plates (22, 24) are disposed on opposed surfaces of the diaphragm ... | 04/21/1998 |
| 5726908 | Liquid quantity sensor and method A sensor apparatus is described that detects and indicates the quantity of cryogenic liquid in a Dewar container, independent of the spatial orientation and the physical motions acting on the container.... | 03/10/1998 |
| 5668478 | Windshield rain sensor The invention concerns rainwater sensors for windshields. In one embodiment, a first, inner, conductive film is applied to the inner surface of the windshield, and a second film, of same size and shape as the first, is applied to the outer surface. Howeve... | 09/16/1997 |
| 5546005 | Guarded capacitance probe and related measurement circuit A continuous liquid level measuring system having a guarded capacitance probe and related drive circuit for providing accurate level measurements, even when measuring the level of ionic and highly viscous fluids. The capacitance probe has two parallel ele... | 08/13/1996 |
| 5477727 | Capacitive level sensor A main sensor electrode part 3 and a reference sensor electrode part 4 are deposited in patterns over the surface of a support member 10. A lead-out part 4b of the reference sensor electrode part 4 is extended through an unplated passage 11 of the main se... | 12/26/1995 |
| 5440455 | Device for fastening a housing The innovation pertains to a device for fastening the housing of a data sensing element which encloses electronic circuits and connecting elements. Data sensing elements of this type are fastened in the wall which encloses the medium to be measured by mea... | 08/08/1995 |
| 5315872 | Liquid level sensor for electrically conductive liquid Apparatus for measuring the volume of an electrically conductive liquid held in a confined area includes a tank constructed of electrically conductive, fiber-reinforced composite material having an inside surface and an outside surface. An electrically in... | 05/31/1994 |
