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| Number | Title | Issue Date |
| 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 |
| 5532527 | Level switch A level switch includes an operational amplifier, provided with positive and negative feedback, and a sensor, together forming an astable multivibrator. The oscillation onset and frequency of the multivibrator depend on the surface level of controlled mat... | 07/02/1996 |
| 5513527 | Fuel-gauging systems An ultrasonic fuel-gauging system for an aircraft with three fuel tanks has probes in each tank connected to dual-lane data concentrator circuits. The digital outputs from one lane of the data concentrator circuits are supplied to respective tank circuits... | 05/07/1996 |
| 5507178 | Liquid presence and identification sensor A sensor for determining both the presence of a liquid in a container or conduit, and identifying its type has a sensor housing body containing both a pair of piezoelectric elements used as the transmitter and receiver of ultrasonic waves directed across ... | 04/16/1996 |
| 5493922 | Liquid level sensing probe and control circuit A method and apparatus for a liquid level sensor control circuit of a bioassay apparatus for controlling a position of a sampling probe with respect to a surface of a liquid in a container. The apparatus includes a sampling probe, an oscillator circuit co... | 02/27/1996 |
| 5495130 | Point level switch A capacitance point level switch includes a probe adapted to be disposed in a material containing vessel, the material having a capacitance value dependent upon its level in the vessel. An oscillator circuit develops a periodic signal at a select frequenc... | 02/27/1996 |
| 5486815 | Moisture detection circuit A detector circuit in a moisture detector having an oscillator, a detector electrode and a common electrode for measuring the moisture content of wood and structural materials in buildings comprises a clamping diode network which couples an AC signal gene... | 01/23/1996 |
| 5481197 | High pressure, leak resistant explosionproof capacitance probe A low intrinsic capacitance probe system for measuring capacitance to detect the liquid fill level of a pressure vessel that incorporates a high pressure center rod retention system and an explosionproof flame path seal into its mounting gland. The system... | 01/02/1996 |
| 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 |
| 5465619 | Capacitive sensor An apparatus for detecting the level of material in a container. The apparatus comprises a power source and a first electrode, positioned adjacent the container, electrically connected to the power source. The apparatus further comprises a second electrod... | 11/14/1995 |
| 5463378 | Proximity detection system and oscillator, and method of using same A proximity detection system includes a dual mode oscillator for generating a pair of ON and OFF control signals. A sensing circuit including a capacitance device detects the presence of a conductive object, such as a liquid, to cause the oscillator to sw... | 10/31/1995 |
| 5456108 | Baffle assembly for ultrasonic liquid level measuring probe A baffle assembly for use in an ultrasonic system for measuring the level of a contained volume of liquid by calculating the density of the liquid by determining the dielectric constant thereof. The baffle assembly is located at the lower end of a stillwe... | 10/10/1995 |
| 5446444 | Capacitive threshold detector test circuit A test circuit for testing operation of a liquid level detector. The liquid level detector includes a probe that is placed at a test site. A control circuit monitors changes in capacitance of the probe due to changes in the liquid level at the test site. ... | 08/29/1995 |
| 5437184 | Capacitive liquid level sensor having phase detecting circuitry A capacitive liquid level sensor having phase detecting circuitry incorporates a capacitive sensor array, an oscillator generating an input signal, a switching circuit sequentially coupling the input signal to the input plates of the capacitive sensor, on... | 08/01/1995 |
| 5427136 | Fluid level detection system A liquid level detecting device having an overflow reservoir, a flow restriction means and a level detecting means. The reservoir defines a cavity for collecting an electrically-conductive liquid overflowing from a container. This reservoir, which has a l... | 06/27/1995 |
| 5423214 | Variable fluid and tilt level sensing probe system Digital tilt level sensing probe system comprising a set of multiple capacitor elements in a fluid container arranged along an axis of measurement where each multiple capacitor element represents a discrete level increment in dielectric material fluid to ... | 06/13/1995 |
| 5423206 | Fluid flow apparatus with capacitive sensors An automatic atmometer includes an evaporating head that is coupled to a metering vial through a three-way valve controlled by fluid sensors disposed proximate inlet and open ends of the metering vial. The three-way valve is ordinarily in a quiescient sta... | 06/13/1995 |
| 5419389 | Fuel treatment and measuring apparatus A fuel heater formed form an elongated structure which defines a fuel channel passing through the length thereof and which defines in the bottom thereof a fuel intake. The unitary structure also defines a heating fluid inlet and outlet on one side of the ... | 05/30/1995 |
| 5406843 | Digital liquid level sensing apparatus A digital liquid level sensing apparatus for detecting variations in the dielectric of a substance being sensed. The apparatus includes a capacitive element array including a plurality of individual (i.e., segmented) input plates positioned along an axis ... | 04/18/1995 |
| 5399979 | Capacitance probe assembly The assembly comprises an electrically insulated linear array of a plurality of active plates working in conjunction with common return plate means to provide a line of capacitors. The electrically insulated active plate array and common return plate mean... | 03/21/1995 |
| 5397995 | RAM vent capacitance level probe with overfill leak detection capabilities An improved capacitance level probe is shown which can be positioned within the return vapor passage of a coaxial vapor recovery refueling system for detecting changes in liquid level within an underground fuel storage tank. The level probe has an outer c... | 03/14/1995 |
| 5391839 | Device for the electrically insulated attachment of a metallic probe electrode in the opening of a housing A device is proposed for the electrically insulated attachment of a metal probe electrode in the opening of a housing, preferably a measuring probe for measuring the filling status in the opening of a probe head housing. The device has a metal rod electro... | 02/21/1995 |
| 5385110 | Boat trim control and monitor system A boat trim control system that includes a boat having a bull and means such as trim tabs mounted to the hull for trimming attitude of the boat as the bull is propelled through the water. The system includes facility for selectively adjusting the trim tab... | 01/31/1995 |
| 5365783 | Capacitive sensing system and technique An arrangement senses a liquid level by monitoring the peak capacitance formed between a probe and the liquid as the probe approaches or departs from the liquid. In an automated system, a computer controls the position of a pipette probe for aspirating or... | 11/22/1994 |
| 5363695 | Leak detection system and method for detecting and measuring liquid leaks A system and method for detecting leaks in a storage tank that includes a stored tank liquid and an immiscible test liquid, and there is an interface formed between the tank liquid and the test liquid. The system includes a transducer and electronic devic... | 11/15/1994 |
| 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 |
| 5307678 | Material level probe having crimp seal A level measuring probe in which all potential leakage paths are closed by concentrically shrinking the outmost diametrical surface of the probe by some mechanical means such as a crimper or rotary swager to provide sufficient force to substantially unifo... | 05/03/1994 |
| 5304936 | Electrical water drop sensor with varying gap width A water drop sensor comprises a pair of electrodes disposed in association with a portion of a surface of a vehicle window within a wipe pattern and having edges defining an extended insulating gap between the electrodes. The electrodes define a gap which... | 04/19/1994 |
| 5287086 | Proximity detection system and oscillator A proximity detection system includes a dual mode oscillator for generating a pair of ON and OFF control signals. A sensing circuit including a capacitance device detects the presence of a conductive object, such as a liquid, to cause the oscillator to sw... | 02/15/1994 |
| 5275951 | Liquid level sensing method and device An apparatus is provided which includes a reaction cartridge having a plurality of reaction wells having different reagents disposed thereon, at least one well adapted to receive a sample, a well containing particles adapted to bind to the sample and whic... | 01/04/1994 |
| 5245873 | Capacitance-type material level indicator and method of operation A system and probe for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as... | 09/21/1993 |
| 5230439 | Container having therein means for detecting levels of liquid The container includes a shell defining an interior volume and including a main part, peripherally bound by a portion of a main partition and an end part defining a duct giving access to the interior volume, the transverse dimensions of the duct being sma... | 07/27/1993 |
| 5207098 | Device to measure the level of material within a container A device is disclosed to measure the level of material within containers, in particular containers in which free-flowing materials having different dielectric constants, for example water and oil, are collected. The device includes a sensor, which is arra... | 05/04/1993 |
| 5190084 | Filling element for filling machines for dispensing liquid A filling element for filling machines is provided and includes a liquid flow valve, which comprises a valve body that can be moved back and forth in a filling element axis between a position that closes the liquid flow valve off and a position that opens... | 03/02/1993 |
| 5187979 | Multi-sensor probe assembly and method for fuel storage system including overflow protection means A probe assembly and method is disclosed which includes a plurality of sensors for respectively mreasuring predetermined attributes of a fluid. The probe assembly comprises a first sensor for measuring the quantity of the fluid. The first sensor includes ... | 02/23/1993 |
| 5182947 | Electric measuring arrangement for determining the level of an electrically conductive liquid An electric measuring arrangement having at least one measuring sensor and an evaluation circuit which makes possible a continuous measurement of not only the level of a conductive liquid in a container but, also, enables evaluation of as much other physi... | 02/02/1993 |
| 5182545 | Fluid level sensor having capacitive sensor A capacitive liquid level sensor utilizes capacitive principles to sense the level of a liquid contained within a receptacle. As a liquid rises and falls in the container, the dielectric effect of the liquid changes the effective capacitance of a sensing ... | 01/26/1993 |
| 5175505 | Capacitive sensor for measurement of a fuel wall film, particularly in an intake duct of an internal combustion engine A capacitive sensor includes a plurality of individual condenser elements, each of which consist of a first, preferably circular, electrode and a second, preferably surrounding ring-shaped, electrode, which are mounted on one side of a nonconducting suppo... | 12/29/1992 |
| 5165084 | System and method for measuring changes in sea level A system for determining changes in sea level based on the measurement of distance between capacitive elements. The system includes an electrically conductive sphere 17, 117 mounted on an electrically non-conductive buoy 13, 113, positioned a predetermine... | 11/17/1992 |
| 5156047 | Water sensor that detects tanks or vessel leakage A water level sensing probe having a probe body (24), a protective sleeve (28), and an external housing (26) is disclosed. The body contains a detector board (40) that partially protrudes from its bottom and a logic board (42) that partially protrudes fro... | 10/20/1992 |
