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| Number | Title | Issue Date |
| 8111075 | Electronic circuit with capacitive switching ability Electronic circuit for the detection of a capacitive variation on two distinct contact capacitors, (C1, C2), comprising means able of squaring the signals generated by a conventional pulse generator and filtered by two filters (R1, C1-R | 02/07/2012 |
| 7834645 | Variable capacitance circuit, voltage measuring apparatus, and power measuring apparatus A variable capacitance circuit includes a capacitance changing structure constructed by connecting a first construction unit, a second construction unit, a third construction unit, and a fourth construction unit, which each include a first electric element that hind... | 11/16/2010 |
| 7372026 | System for repositioning a microfabricated cantilever A system for repositioning a microfabricated cantilever includes a microfabricated cantilever, a first device operable to detect a position of the microfabricated cantilever, and a second device. The first device is operable to determine an offset in the position of... | 05/13/2008 |
| 6776043 | Variable capacitance bridge accelerometer A bridge accelerometer system includes four capacitors, wherein two capacitors are formed on each side of a rigid member. The other two capacitors are similarly constructed, except that the rigid member is replaced by a flexured plate. The construction of the plates... | 08/17/2004 |
| 6590401 | Capacitive proximity switch for evaluating minor changes in capacitance and method therefor Invention relates to a capacitive proximity switch with an electrical bridge circuit for detecting of an electrically conducting face (15) approaching or moving away, wherein the electrically conducting face (15) is part of a capacitor (for example C1) of... | 07/08/2003 |
| 6551233 | Magnetic stimulator power and control circuit An electromagnetic stimulator circuit has a precharge power supply, a capacitor, a set of switches, and a stimulator coil. The switches, which can be implemented using a variety of devices, enable flexible control over the coil current waveform without re... | 04/22/2003 |
| 6404209 | Measuring instrument for fill level sensors A measuring instrument (11) for fill level sensors (4) having a measuring electrode (6) and a compensating electrode (9). The measuring instrument (11) has a bridge circuit whose one bridge branch (21) is formed by two series-connected test resistors (23,... | 06/11/2002 |
| 6330939 | Device and method for determining the authenticity of documents There is a large difference in frequency dependent, complex electrical permittivity between genuine and counterfeit documents, including paper currency. Genuine bills have a substantially different complex permittivity which is distinct from the permittiv... | 12/18/2001 |
| 6114863 | Method for determining the presence of water in materials An improved process for determining the presence of water in a material is disclosed. A set of electrodes is placed on the surface of a layer of the material being monitored, and an electric field is established therebetween. The phase angle for the elect... | 09/05/2000 |
| 6055846 | Method and apparatus for in situ calibration of gas flowmeters The focus of this paper is to introduce a novel method for calibrating natural gas flowmeters. This new method can accommodate very large flow rates and it avoids common problems associated with current techniques for meter proving. In this method, the am... | 05/02/2000 |
| 5899313 | Device and method for currency validation A system for the verification of the genuineness of currency. The complex electric permittivity of the currency is read by measuring its complex impedance. A particular capacitor arrangement is used to sense the complex electric permittivity of the paper ... | 05/04/1999 |
| 5311140 | Circuit for measuring variations in the capacitance of a variable capacitor using a continuously rebalanced detection bridge A circuit for measuring variations in the capacitance of a variable capacr forming part of a sensor includes an oscillator which generates an alternating signal which is supplied to two branches of a detection bridge. The first branch includes the variab... | 05/10/1994 |
| 5262730 | Apparatus and method for determining the permittivity of samples of material over a wide frequency band Measurements of the permittivity of samples over a very wide frequency range and a wide temperature range have previously involved such problems as changing parts of the measuring equipment in different regions of the frequency range, substituting one of ... | 11/16/1993 |
| 5258719 | Capacitive coagulation detecting device for mixed phase container A device for detecting a coagulation in a mixed phase container, such as a fluidized bed type olefin polymerization reactor, includes at least one coagulation detecting part mounted on an inner surface of the reactor, and a coagulation detecting circuit f... | 11/02/1993 |
| 5135113 | High-speed tablet sorting machine A device for sorting tablets by capacitive measurement, including a disk rotating between capacitor plates, a tablet fielding device for sequentially metering a series of tablets onto the disk, an arcuate guide assembly for guiding the tablets along a gui... | 08/04/1992 |
| 5031068 | Liquid level control system for refrigeration apparatus An improved capacitance bridge type liquid level control system for use in refrigeration applications is disclosed which provides improved apparatus for sealing the probe in its mounting and for insulating same against the condenser reservoir stand pipe i... | 07/09/1991 |
| 4468611 | Capacitive system for monitoring the dielectric properties of flowing fluid streams A method and instrument for comparing the dielectric properties of a flowing stream of fluid with the dielectric properties of a reference fluid in which a uniquely configured multi-capacitor sensor, formed of a first pair of capacitors having like dielec... | 08/28/1984 |
| 4431962 | Capacitor monitoring by single resistor adjustment A humidity element circuit calibration arrangement utilizing a humidity responsive capacitive element is provided for. A single signal generator arrangement provides two opposite phases of the same voltage to energize the circuit thereby allowing for simp... | 02/14/1984 |
| 4295092 | Apparatus for and method of detecting and measuring corrosion damage in pipe Apparatus for and a method of detecting and measuring the presence and degree of corrosion damage in pipe by using a probe which forms a capacitor with the wall of the pipe is disclosed. The probe is moved interior to and longitudinally of the pipe, and t... | 10/13/1981 |
| 4208625 | Capacitive measuring system with automatic calibration In a device for continuously monitoring the characteristics of a moving filament, such as the denier of an extended synthetic yarn, by passing the filament through a capacitive sensor to develop an electrical signal representing an absolute measurement of... | 06/17/1980 |
| 4086528 | Capacitive transducers Measuring apparatus for determining a linear quantity comprising a capacitance transducer having at least one capacitance variable in accordance with changes in the dimensions of the quantity being measured, and a reference capacitor of substantially cons... | 04/25/1978 |
| 4084997 | Apparatus for monitoring core charging of waterproof communication cable An apparatus is disclosed for monitoring the charging of a cable core with filling compound by continuously comparing the mutual capacitance of a twisted pair in the core with the predicted capacitance of a twisted pair known to be completely charged with... | 04/18/1978 |
