Class 73/749 - With electrical readout

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein the displacement of the liquid within
No. of patents: 37
Last issue date: 11/01/2011

Number	Title	Issue Date
8047079	Method for controlling an electronic pressure gauge and pressure gauge therefor The invention provides a method for controlling an electronic manometer for measuring pressure (p) inside a pressurized gas receptacle. The manometer comprises at least one pressure sensor, an electronic unit designed for the acquisition, storage and processing of d...	11/01/2011
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
7302964	Housing for a liquid seal vacuum and pressure relief valve apparatus A housing and a method of using a liquid for controlling vapor flow through a valve apparatus between a canister and atmospheric conditions. The housing includes a container and a first partition that projects from the housing into the liquid and divides the vapor c...	12/04/2007
7210358	Force sensor assembly A force sensor assembly includes a force sensor, a first support member, a threaded portion, an opening made in the first support member, a nut, a restricting member and a spacer. The nut is screwed onto the threaded portion which is inserted through the opening. Th...	05/01/2007
7181973	Air pump with a manometer received therein An air pump includes a cylindrical casing, a manometer movably received in the cylindrical casing to be selectively extended out of the cylindrical casing, an air duct securely received in the manometer to be firmly engaged with an inner face defining the reduced bo...	02/27/2007
6889669	System and method of managing pressure in a fuel system A system and method of managing fuel vapor pressure in a fuel system. The direction of air flow between first and second ports on either side of a chamber is controlled by a liquid that divides the chamber into first and second portions. A leak detection test, exces...	05/10/2005
6626045	Pressure measurement device A pressure measurement device comprising a housing enclosing an elastic pressure measurement element and a magnet attached to the measurement element. First and second Hall sensors operatively positioned near the magnet are connected to an electrical circ...	09/30/2003
6591684	Pressure sensor intergrated into an electro-hydraulic control unit A pressure sensor is mounted upon a hydraulic valve body. The sensor has a base which extends into a bore formed in the valve body. The valve body bore is in communication with a pressurized hydraulic fluid. A cover that is removably attached to the valve...	07/15/2003
6557417	Method and device for void fraction measurement and adverse output signal mitigation on pressure-base instruments A method and device for void fraction measurement in a gas/liquid two-phase stratified flow system in disclosed. A couple of pressure-signal tubes are mounted to the through into the top and bottom walls of the horizontal pipeline portion of the flow syst...	05/06/2003
6349602	Seat occupant detection apparatus A beam is mounted to a mounting flange. A seat pan is mounted to opposite end portions of the beam. Provided near a middle portion of the beam is a sensor unit for detecting flexure of the middle portion of the beam. The sensor unit has a sensor beam whos...	02/26/2002
6305228	Pressure sensor device and suction release apparatus When a suction/breakdown instruction signal is changed over from a high state to a low state, a vacuum generating electro-magnetic valve is turned on (the vacuum release electro-magnetic valve is closed). If the negative pressure in the pressure tube is e...	10/23/2001
6122972	Capacitive pressure sensor with moving or shape-changing dielectric A pressure sensor system includes a first conductive surface electrically isolated from a second conductive surface. A dielectric material is interposed between the first conductive surface and the second conductive surface. The dielectric material is mov...	09/26/2000
5902932	Force balancing capacitance manometer An apparatus for measuring the differential pressure between at least two fluids including (a) first and second pressure enclosures; (b) first and second pressure deformable members where the first deformable member is sealingly connected to the first pre...	05/11/1999
5760693	Vacuum apparatus for semiconductor device A vacuum controlling apparatus is provided. The vacuum level of a vacuum chamber can be accurately maintained by measuring and controlling the vacuum level of the vacuum chamber by using six parameters: desired pressure, predetermined time for reaching th...	06/02/1998
5636547	Liquid level monitoring system having ferrofluid pressure sensor A liquid level monitoring system, which monitors the level of liquid in a storage tank, includes a differential pressure sensor that uses a magnetic fluid, or ferrofluid, sensing element. The pressure sensor is U-shaped with a first one leg connected, via...	06/10/1997
5450853	Pressure sensor A pressure sensor having a tubular member partially filled with a ferrofluid column and partially filled with air, with an electrically conductive coil wrapped around the tubular member. When in use, the coil has alternating current running therethrough a...	09/19/1995
5429000	Ferrofluid pressure sensor A differential pressure sensor includes a ferrofluid sensing element, or slug, that changes position in a tapered magnetic field in response to a pressure differential. The ferrofluid slug is contained in a tube and moves within the tapered magnetic field...	07/04/1995
5224385	Method for obtaining electrical signals correlated with the position of a mass of mercury in instruments and the like A method of obtaining electrical signals corresponding to the position of a mercury mass movable within a vessel, characterized by the fact that the position of the moving mass within the vessel is detected by means of at least one electromagnetic proximi...	07/06/1993
5138886	Electronic manometer An electronic manometer for measuring pressure differentials between first and second outlets of a U tube supporting a column of mercury. The U tube includes for each arm a coaxial feedline which is terminated by the column of mercury. The coaxial feedlin...	08/18/1992
5111700	Method and apparatus for obtaining electrical signals correlated with the position of a mass of mercury in instruments and the like A method of obtaining electrical signals corresponding to the position of a mercury mass movable within a vessel, characterized by the fact that the position of the moving mass within the vessel is detected by means of at least one electromagnetic proximi...	05/12/1992
4991404	Vacuum pressure monitoring system A vacuum pressure monitoring system includes a mercury manometer in communication with a vacuum line from an apparatus operating under high vacuum (approx. 0.25 in. Hg). A proximity sensor targets the height of the Hg. Incremental changes in the height of...	02/12/1991
4825700	Bi-axial geomaterial test system A bi-axial compression test apparatus for geomaterial (soil, etc.) samples that is designed to allow free shear band formation and provide measurements of the stress displacement characteristics of the failure zone. A geomaterial sample formed into a spec...	05/02/1989
4782704	Mercury manometer This invention relates to mercury manometers for a purge bubbler liquid level control system or the like. More particularly, this invention relates to mercury manometers comprising a mercury column with electrical contacts imbedded in the walls of the col...	11/08/1988
4739663	Acoustically monitored manometer A U-tube manometer for calibrating a differential pressure transducer or the like, wherein the height of working fluid in each column may be determined by the two-way travel time of an acoustic pulse launched from the top of each column against the top of...	04/26/1988
4685908	Device for detecting increased pressure in pleural cavity A prebubble detector is provided for an underwater drainage apparatus. A series of sensors and detectors are disposed along the small arm of the underwater seal in a drainage device and means is provided for detecting the least degree of negativity reache...	08/11/1987
4650767	Respirometer module with replaceable sample chamber The respirometer module consists of an airtight chamber which includes an air pump, a carbon dioxide scrubber, an electronic gas volume transducer, an air vent, and a fill tube. This single module is combined with separate sample chambers of various sizes...	03/17/1987
4554535	Method and apparatus for obtaining electrical signals correlated with the position of a mass of mercury in instruments and the like A method of obtaining electrical signals corresponding to the position of a mercury mass movable within a vessel, characterized by the fact that the position of the moving mass within the vessel is detected by means of at least one electromagnetic proximi...	11/19/1985
4462259	Pressure transducer A pressure transducer of the manometer type comprises two interconnected columns of liquid with means for applying differential pressure across the columns. The liquid is a magnetic liquid and a magnetic field is impressed on the columns to attract the li...	07/31/1984
4461181	Control for sample volume metering apparatus A manometer is provided for metering samples of fluid flowing in devices wherein particle concentration in the fluid is being counted or measured. Such devices include particle counters for determining blood cell concentration in body fluid. The device in...	07/24/1984
4423638	Capacitive system for manometric detection and measurement of differential pressures A manometric method and instrument for the continuous detection and measurement of differential pressures which includes a uniquely configured multi-capacitor sensor system. The sensor system is formed of a first pair of plate type capacitors having like ...	01/03/1984
4380933	Electrical control mercury monometer A flat plate manometer includes a rectangular mercury column having calibration scales and a plurality of closely spaced stainless steel contacts disposed along the column. The mercury closes a circuit between a common contact and the column contacts as t...	04/26/1983
4380932	Capacitance manometer differential pressure sensor A transducer for providing an output signal having a value determined by an input pressure differential includes a capacitance manometer having a first input for receiving a first input pressure and a second input for receiving a second input pressure, th...	04/26/1983
4354389	Vapor pressure sensor and flow measuring devices Disclosed is a method and apparatus for measuring and/or continuously recording small pressure differences by means of a novel manometer-like device. Accuracies of plus or minus about 0.05 dynes/square centimeter are achieved by means of a disclosed devic...	10/19/1982
4353148	Electric pressure switch An electric pressure switch for use with textile machines and the like has a U-shaped tube filled with a liquid. One of the legs is above the liquid level in communication with a source of variable fluid pressure, for example a fiber feeding chute of a te...	10/12/1982
4259975	Stock tank gauger-level controller Liquid level in tanks is gauged an can be controlled as follows. Liquid communication is provided from near the bottom of the tank to a liquid reservoir containing a liquid which is of different density and immiscible with the tank liquid. The reservoir i...	04/07/1981
4244365	Device for use in detecting occlusion in an infusion system An overpressure device is disclosed for use in a liquid infusion set for the purpose of detecting excessive pressures which may occur during infusion. The device comprises a tubular member with an inlet and an outlet, a closed pressure chamber and a bridg...	01/13/1981
3943769	Electric conductive laminated vessel wall In a preferred embodiment of the invention, there is provided a laminated vessel wall which is able to enclose electrically conductive liquid with a know electrical property and which vessel laminated wall has alternate electric conductive and non-conduct...	03/16/1976

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Class 73/749 - With electrical readout