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| Number | Title | Issue Date |
| 7342185 | Compression column load cell with compensation for off center loading errors Simple and inexpensive electrical compensation for off-axis and off-center loading sensitivity is possible in compression column load cells having a pair of compensation strain gages in series with each of the main strain gages in the load cell. The compensation gag... | 03/11/2008 |
| 7293466 | Bolt with function of measuring strain A bolt with a function of measuring strain, comprising a Wheatstone bridge circuit comprising a strain sensor and a dummy resistor, a translate circuit that amplifies a signal from the Wheatstone bridge circuit to convert the same into a digital signal, a transmitti... | 11/13/2007 |
| 7252008 | Micromechanical piezoresistive pressure sensor device A micromechanical piezoresistive pressure sensor device having a sensor substrate, in which an essentially rectangular diaphragm region is provided; a piezoresistive resistance device having at least one piezoresistive resistor strip, which runs parallel to the long... | 08/07/2007 |
| 7216554 | Physical quantity sensor having enhanced temperature compensation capability A physical quantity sensor according to the invention includes a first member, a second member, a sensing member, a temperature detector, a correcting circuit, and a heat conduction path thermally connecting the sensing member and the temperature detector. The sensi... | 05/15/2007 |
| 7124639 | Ultra high temperature hermetically protected wirebonded piezoresistive transducer An ultra high temperature hermetically protected transducer includes a sensor chip having an active area upon which is deposited piezoresistive sensing elements. The elements are located on the top surface of the silicon wafer chip and have leads and terminals exten... | 10/24/2006 |
| 7040172 | Micromechanical high-pressure sensor A micromechanical pressure sensor and a method for producing a micromechanical pressure sensor. This pressure sensor has at least one membrane and a measuring element situated on the membrane. A pressure applied at the membrane or a pressure differential applied at ... | 05/09/2006 |
| 6973837 | Temperature compensated strain sensing apparatus A strain sensing apparatus for use in the presence of thermal gradients has a strain gauge and resistance temperature gauge in a planar assembly bonded to, deposited on or diffused or implanted in a substrate surface. The apparatus can sense strain and temperature i... | 12/13/2005 |
| 6724202 | Physical quantity detection device with temperature compensation First and second resistors (sensing elements) are connected in series between first and second potentials. The junction point voltage between the first and second resistor is supplied to an inverting input of a first operational amplifier. The non-inverting input is... | 04/20/2004 |
| 6614342 | Strain gauge A high-performance strain gauge has a high gauge factor and a decreased temperature coefficient of resistance (TCR). The strain gauge has a laminated structure that includes a first layer formed of a positive TCR material and a second layer formed of a ne... | 09/02/2003 |
| 6301775 | Alumina encapsulated strain gage, not mechanically attached to the substrate, used to temperature compensate an active high temperature gage in a half-bridge configuration A temperature compensation element for a high-temperature strain gage and the method of fabricating the same. Preferably, the element is a "dummy" strain gage not mechanically attached to the substrate. The element is encapsulated in an insulative materia... | 10/16/2001 |
| 5698785 | Self-compensating accelerometer A motion sensor for sensing motion or acceleration of a body, such as the type used in onboard automotive and aerospace safety control system, navigational system or active suspension control system. The motion sensor includes a support frame, a bridge pr... | 12/16/1997 |
| 5694018 | Apparatus for charging a battery Apparatus for charging a battery (5) includes a battery compartment for accommodating the battery in a manner such that its electrical terminals are in contact with a pair of electrodes. The electrodes are connectable to respective poles of a controllable... | 12/02/1997 |
| 5640077 | Battery recharging apparatus Apparatus for recharging a battery includes a compartment for accommodating the battery in a manner such that its electrical terminals are in contact with a pair of electrodes. The electrodes are connectable to respective poles of a controllable source of... | 06/17/1997 |
| 5594405 | Pressure transducer with pressure sensitive conductor A pressure transducer has a cylindrical body with a thread formed on at least part of the outer surface. A resistance element is wound in the thread and an internal bore receives pressurized fluid. The resistance element is strained by application of pres... | 01/14/1997 |
| 5309136 | Electrical circuit such as a Wheatstone bridge with a resistance-adjusting portion An electrical circuit such as a Wheatstone bridge has a conductive strip extending between a current input terminal and a current output terminal and includes two resistors having a connecting part therebetween, a conductive segment extending between the ... | 05/03/1994 |
| 5306873 | Load cell with strain gauges having low temperature dependent coefficient of resistance A load cell utilizable in a weighing apparatus. The load cell is fabricated by forming a strain gauge pattern (4) of a copper-nickel alloy on a surface of a strain inducing element (1) by the use of a sputtering technique and subsequently heat-treating th... | 04/26/1994 |
| 5227760 | Strain gage A strain gage includes four gages that constitute a bridge circuit, and at least one resistance device which is used to adjust the offset voltage of the bridge circuit formed by the four gages. The resistance device is disposed on the strain gage between ... | 07/13/1993 |
| 5220305 | Semiconductor pressure sensor A semiconductor pressure sensor chip has a pattern including first diffusion sections in which external connection contacts are formed. Resistors are connected to the first diffusion sections through second diffusion sections in a bridge circuit such that... | 06/15/1993 |
| 5192938 | Strain gage, transducer employing the strain gage, and method for producing the strain gage A strain gage or a measuring transducer equipped with such a strain gage has, for supporting the measuring grid structure, a backing made of a polyphenylenesulfide film. Such a backing assures a plurality of desirable characteristics simultaneously and eq... | 03/09/1993 |
| 5187985 | Amplified pressure transducer A pressure transducer circuit is provided which includes a bridge arrangement of piezoresistors which are connected to a diaphragm that is sensitive to a pressure which is monitored. The output of the sensor bridge is provided to a preamplifier which is, ... | 02/23/1993 |
| 5167158 | Semiconductor film pressure sensor and method of manufacturing same This invention provides a semiconductor film pressure sensor in which the pressure-sensitive resistance layers are made of an n-type polycrystalline silicon layer, and a method of manufacturing the sensor. In the semiconductor film pressure sensor of the ... | 12/01/1992 |
| 5095755 | Isolator for pressure transmitter In a pressure transmitter, a central region of an isolator diaphragm with a substantially flat shape at an undeflected position near room temperature has a depressed shape at a deflected position at a colder temperature. The isolator diaphragm is over a s... | 03/17/1992 |
| 5031461 | Matched pair of sensor and amplifier circuits A low-cost, quickly prototyped sensor circuit assembly comprises a sensor integrated circuit and an amplifier circuit, wherein all adjustable system resistors are located on the sensor integrated circuit in the form of adjustable thin-film resistive eleme... | 07/16/1991 |
| 4951027 | Load cell A load cell comprises a distortion generating body including first and second arms each of which has a thickness y and which are arranged in parallel, and thin deformable portions of a thickness x, which are coupled to the two ends of each of the first an... | 08/21/1990 |
| 4899125 | Cantilever beam transducers and methods of fabrication A cantilever beam transducer which is formed by a batch technique utilizing conventional semiconductor processes. The cantilever beam structure has a central aperture which is rectangular in configuration and which is bounded by thinned rib or thinned are... | 02/06/1990 |
| 4836027 | Circuit for a sensor In a circuit for a sensor the output signal of which is dependent not only on the variable to be determined but also on the temperature, an amplifier having a temperture-dependent amplification factor is connected to the output of the sensor, and the outp... | 06/06/1989 |
| 4836025 | Accelerometer First and second piezo reistances are disposed on a flexible member which supports a mass member on a semiconductor base and are arranged to be responsive to the amount of flexure thereof. The flexible member has a predetermined uniform thickness. Second ... | 06/06/1989 |
| 4821011 | Pressure sensor A pressure sensor in which a Ni-Si-B amorphous alloy strain gauge is covered and protected from the external impact and dust in the air by a protective film.... | 04/11/1989 |
| 4788521 | Temperature compensation system for piezoresistive pressure sensor A temperature compensation scheme for a piezoresistive pressure sensor utilizing resistors with carefully chosen temperature coefficients of resistivity to provide a totally passive network.... | 11/29/1988 |
| 4766655 | Method for fabricating a compensated silicon pressure sensing device A pressure sensing device including a single crystal of silicon configured to have a diaphram portion, a frame portion and associated circuitry formed on the crystal is described. Piezo-resistive elements on the boundary of the frame and the diaphram port... | 08/30/1988 |
| 4765188 | Pressure transducer with integral digital temperature compensation A pressure transducer of the type employing a pressure-responsive diaphragm (11) with silicon piezoresistive strain gauges epitaxially deposited thereon is provided with integral digital thermal compensation of span shift and zero shift. The strain gauges... | 08/23/1988 |
| 4747456 | Load cell and temperature correction of the same A load cell and a method of correcting the same are provided wherein a beam member on which an insulator film is formed is prevented from being trimmed by a laser beam upon laser trimming thereof. The load cell comprises a span resistor member and a zero ... | 05/31/1988 |
| 4726232 | Temperature coefficient compensated pressure transducer A pressure transducer, which includes a silicon diaphragm with ion-implanted resistors in Wheatstone Bridge configuration and in insulating layer covering the diaphragm, is provided with temperature compensation for differences in thermal expansion coeffi... | 02/23/1988 |
| 4675643 | Pressure transducer utilizing a transduction element A piezoresistive transduction element for incorporation into a pressure transducer includes a plate defining a diaphragm zone and preferably of silicon with piezoresistances diffused into it, an insulating plate of a glass material and a base plate. The p... | 06/23/1987 |
| 4628296 | Load cell A load cell has four strain gauge resistors formed through an insulation layer on the beam body having a strain generating section, a conductive pattern for forming a bridge circuit by coupling the strain gauge resistors compensation resistance sections f... | 12/09/1986 |
| 4558238 | Pressure transducer using integrated circuit elements A pressure transducer comprises a pressure sensor including a bridge connection of gauging resistors formed on a semiconductor substrate, and a power supply connected to the pressure sensor for driving it and basically acting as a constant current source.... | 12/10/1985 |
| 4556807 | Pressure transducer with temperature compensation circuit A pressure transducer is disclosed comprising a pressure sensor portion having gage resistors in bridge formed on a thin diaphragm of a semiconductor substrate, and a power supply connected to the pressure sensor portion for driving the pressure sensor. T... | 12/03/1985 |
| 4530249 | Dynamometer device In a device for measuring forces by means of an anti-friction bearing which is provided with strain gauges at various measurement points, which serve to detect overroll extensions, two strain gauges connected as a half-bridge are used in each case, which ... | 07/23/1985 |
| 4522067 | Thin-film strain gauge A thin-film strain gauge and a method for producing it are proposed; the strain gauge is advantageously capable of integration into a thin-film circuit. The strain gauge comprises an elastically deformable spring element in combination with at least one e... | 06/11/1985 |
| 4490803 | Temperature compensation of a resistance bridge circuit A resistance bridge circuit is temperature compensated, for both zero error and sensitivity, over a predetermined temperature range by connecting a first compensating resistance in series with one resistor of the bridge, and a second compensating resistan... | 12/25/1984 |
