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| Number | Title | Issue Date |
| 7331240 | Apparatus and method for connecting vehicle wheel sensors to a controller The present invention relates to a vehicle wheel sensor apparatus and a method that determine if a vehicle wheel sensor is active or passive, while efficiently providing the necessary connectivity, power, and communication between the sensor and a controller, withou... | 02/19/2008 |
| 7288860 | Magnetic transducer with ferrofluid end bearings An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between... | 10/30/2007 |
| 7213465 | Micromechanical sensor A micromechanical sensor, and a method for manufacturing a micromechanical sensor, featuring, in addition to a sensor element, at least a part of an evaluation circuit. In this context, the micromechanical sensor contains at least a first structural element made of ... | 05/08/2007 |
| 7131335 | Pressure sensor with barrier providing impending sensor failure indication A pressure transmitter for transfer of a pressure prevailing in a first medium onto a second medium, including a pressure chamber 4 in a platform 1, which chamber is separated from the first medium by means of a dividing membrane 2, wherein the ... | 11/07/2006 |
| 7077009 | Pressure sensitive surfaces A position sensor comprises a substrate having an array of pressure sensors and a membrane overlying the substrate. The membrane includes physical parameters which vary with position. The membrane may include discontinuous regions and protrusions which affect the wa... | 07/18/2006 |
| 6978679 | Hydraulic pressure sensor A hydraulic pressure sensor for measuring the pressure in a hydraulic pressure chamber 1. A reservoir housing 9 is connected to the pressure chamber, and the interior of the housing is divided by a slideable partition 13 which defines a reservoi... | 12/27/2005 |
| 6909281 | Position sensor using a compound magnetic flux source A non-contacting position sensor detects relative displacement between two objects. A magnetic flux source is provided by a plurality of discrete magnets selectively determined to produce a highly configurable flux source that is easily adapted to rotary or rectilin... | 06/21/2005 |
| 6868720 | Testing of pressure sensor in surgical cassette A method of determining the accuracy of a pressure sensor in a surgical cassette is disclosed. The method involves displacing a diaphragm of the sensor a pre-defined amount of displacement, and measuring the force exerted on the diaphragm by the displacing step. The... | 03/22/2005 |
| 6782753 | Thermodynamic pressure/temperature transducer health check A device and procedure for checking the health of a pressure transducer in situ is provided. The procedure includes measuring a fixed change in pressure above ambient pressure and a fixed change in pressure below ambient pressure. This is done by first sealing an en... | 08/31/2004 |
| 6715359 | Pressure sensitive surfaces A position sensor comprises a substrate having an array of pressure sensors and a membrane overlying the substrate. The membrane includes physical parameters which vary with position. The membrane may include discontinuous regions and protrusions which affect the wa... | 04/06/2004 |
| 6595051 | Fluid level sensing and control system An improved pressure activated control apparatus is provided for sensing fluid pressure and triggering one or more switches in response to the fluid pressure, as desired. The apparatus is designed to be placed within a fluid of a reservoir. The apparatus ... | 07/22/2003 |
| 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 |
| 6419456 | Switch for controlling the motor of a piston pump A fluid pump having a motor operably coupled to a pump assembly, the motor and pump assembly acting cooperatively to pressurize a fluid includes a pressure switch being in communication with the fluid under pressure and being in communication with the mot... | 07/16/2002 |
| 6224094 | Force sensor for seat occupant weight sensor A force sensor for sensing the weight of a vehicle seat occupant for a vehicle's occupant protection system has a pressure sensor responsive to hydraulic pressure resulting from axial force applied to the force sensor. A constant force spring in the form ... | 05/01/2001 |
| 6125707 | Pressure detection device A pressure detection device for detecting an increase of pressure acting thereon includes an electrically conductive device housing which has an accommodation bore extending inward from one end of the device housing and a slide bare extending between the ... | 10/03/2000 |
| 5990428 | Pressure switch for hydraulic pump An easily assembled, low cost pressure switch for a hydraulic pump is proposed. An oil pressure introducing hole is provided for leading a discharge pressure to a depression formed in a body which is earthed. A plug supporting an electrically conducting t... | 11/23/1999 |
| 5693926 | Differential pressure indicators A double differential pressure indicator has a housing containing two pistons arranged in contiguous bores and biased by a single spring extending between opposed ends of the pistons. The differential pressure is applied across both pistons and as the pre... | 12/02/1997 |
| 5602373 | Differential pressure switch with an adjusting piston driven by a restoring spring for an oil-separating air filter A differential pressure switch particularly suitable for monitoring dirt accumulation on a filter element of an oil-separating air filter comprising a piston which is movable in response to a relative change in pressure between two pressure zones and is b... | 02/11/1997 |
| 5537883 | Piezoelectric pressure sensor and method of manufacturing the same A sensor for detecting the combustion pressure of an engine, in which an upper fixing member and a casing are fixed while a pre-load is being applied to the upper fixing member, so that a pre-load may be applied to a piezoelectric element. Moreover, a tub... | 07/23/1996 |
| 5490425 | Ferrofluid pressure sensor and warning device Mechanically simple, reliable devices for measuring pressure or detecting pressures above a certain limit are disclosed. A representative device includes a magnet surrounded by one or more bands of a ferrofluid, and which is free to move within a nonmagne... | 02/13/1996 |
| 5461208 | Compact high pressure snap-acting switch A pressure switch particularly adapted for use with high pressure fluid is shown having a frusto-conical support surface in the form of a protuberance (121, 121') formed at the center of a surface of a piston guide member (12, 12'). A stretchable diaphrag... | 10/24/1995 |
| 5452613 | Wide range vacuum gauge A device for determining a pressure of gas in an evacuated chamber including a cylinder positioned in fluid communication with the evacuated chamber with the cylinder forming a compressed gas chamber, a reciprocating piston received within the cylinder an... | 09/26/1995 |
| 5416294 | Gas-flow operated switch A gas-flow sensor features delayed-action response to physical changes in gases as they flow through the sensor, thus avoiding transient flow-metering displacements in response to such change. The delayed-action response is attributable to blind hole and ... | 05/16/1995 |
| 5381091 | Sensor having mutually perpendicular sections using zigzag coils for detecting displacement A sensor having a wide sensing range is capable of being controll by a small scale processor. The sensor comprises: a plurality of planar zigzag coils being provided on substrates, the planar zigzag coils having the same coil pitch and being formed into z... | 01/10/1995 |
| 5377547 | Piezoelectric pressure sensor having tubular charge detecting unit and method of assembling same A piezoelectric pressure sensor includes a generally elongated sensor housing, a pressure receiving plate disposed at a first end of the sensor housing with a first surface thereof serving as a pressure receiving surface for receiving a pressure applied f... | 01/03/1995 |
| 5365791 | Signal generator A signal generator for generating an electrical signal which varies in accordance with movement of an actuating member includes a plunger slidable mounted within a housing which carries a pair of permanent magnets for generating a magnetic field to be app... | 11/22/1994 |
| 5331838 | Dead weight piston drive and control system An improved dead weight piston pressure measurement/calibration device includes a cylinder and a dead weight piston assembly that includes a piston rotatable and vertically in the cylinder, bell housing supported by the piston and carrying a number of cal... | 07/26/1994 |
| 5331856 | Pressure devices A pressure indication device comprises a housing including a bore in which is received a slidable piston. The piston has two end faces, one of which is for connection to a source of fluid at higher pressure and the other of which is for connection to a so... | 07/26/1994 |
| 5319979 | Load cell pressure sensor for pump cassette The present invention relates to a compression load cell used to monitor pressure in a diapragm cassette pumping system. A plunger is axially slidable in a linear bearing and has a first end in contact with the cassette and the second end in contact with ... | 06/14/1994 |
| 5321220 | Pressure switch A pressure switch comprises an electrically conductive housing, a stationary contact stationarily installed in the housing and a movable contact movably received in the housing. The movable contact is movable to contact with the stationary contact. A hydr... | 06/14/1994 |
| 5317948 | Pressure transducer using permanent magnet and opposing variable magnetic field An electromagnetic fluid pressure transducer is provided which uses the opposing magnetic fields of a permanent magnet and an electromagnet to sense a change in a differential force. The differential force is the result of a pressure applied to the unequa... | 06/07/1994 |
| 5256840 | Holding device for piston position detector Holding device for a piston position detector, contained in a casing and being displaceably mounted on the outside of a fluid pressure cylinder. The holding device consists essentially of a U-shaped yoke being displaceable along two mutually parallel guid... | 10/26/1993 |
| 5243158 | Fluid operated pressure switch for controlling a switching element A pressure switch for controlling a switching element includes a spring-loaded piston operatively connected to the switching element and acted upon by a pressure fluid. A diaphragm separates the piston from the pressure fluid for providing a leaktight clo... | 09/07/1993 |
| 5233142 | Snap action electrical switching mechanism with dual set points A first belleville spring, having a given preload, controls a translatable, elongate, contact disc assembly, to cause a shunting disc to remove from, and close into contact with a pair of circuit contacts. The assembly is disposed within a translatable ca... | 08/03/1993 |
| 5187337 | Fluid pressure actuated switch for fluid pump A pressure switch for operating a device for increasing the engine speed of an automotive vehicle equipped with a power steering system in order to prevent an engine stall when a high load acts on a power steering pump during parking and at a low vehicle ... | 02/16/1993 |
| 5155309 | Pneumatic actuator for a patient call system A pneumatically actuated switching device comprises a pneumatic bulb including a base plate for anchoring the bulb by frictional contact with surfaces in contact therewith. The base plate further having pneumatic seal about an outer periphery thereof, and... | 10/13/1992 |
| 5140113 | Differential pressure control switch with a pivoting actuating lever and a biasing spring sealed in a housing A differential pressure control provides a housing having a pair of opposing inlets for accepting lines having different fluid pressures therein. The inlets are sealably connected to a central chamber having a piston by means of diaphragms. The piston is ... | 08/18/1992 |
| 5092178 | Differential pressure sensor mechanisms Differential pressure sensor mechanisms include core members acted upon by pressure sensing plungers at opposite ends of the core members to cause axial movement of the core members relative to a linear variable position sensor when unequal force balances... | 03/03/1992 |
| 5019678 | Fluid flow switches with low flow resistance A flow switch includes a movable shuttle enclosed within a bore having narrower and wider bore sections. The shuttle has a solid cylindrical portion and a vaned portion. When there is no fluid flow from the inlet to the outlet, the shuttle rests on a part... | 05/28/1991 |
| 4947732 | Electro-hydraulic servo actuator with function for adjusting rigidity An electro-hydraulic servo actuator with function for adjusting rigidity. The electro-hydraulic servo actuator comprises an electro-hydraulic transducer which transduces an electric signal into a hydraulic signal, an actuator of a cylinder type which is o... | 08/14/1990 |
