Did You Know...
...that it was melting ice cream that inspired the invention of the outboard motor? It was a lovely August day and Ole Evinrude was rowing his boat to his favorite island picnic spot. As he rowed, he watched his ice cream melt and wished he had a faster way to get to the island. At that moment the idea for the outboard motor was born!
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| Number | Title | Issue Date |
| 7330007 | Object detecting apparatus An object detecting apparatus includes a piezoelectric sensor provided at an edge portion of an opening/closing body for emitting an output voltage which changes corresponding to an external force applied to the edge portion and a detection circuit for receiving the... | 02/12/2008 |
| 7253488 | Piezo-TFT cantilever MEMS A piezo-TFT cantilever microelectromechanical system (MEMS) and associated fabrication processes are provided. The method comprises: providing a substrate, such as glass for example; forming thin-films overlying the substrate; forming a thin-film cantilever beam; an... | 08/07/2007 |
| 7186356 | Analytical device A sensor for chemical species or biological species or radiation presenting to test fluid a polymer composition comprises polymer and conductive filler metal, alloy or reduced metal oxide and having a first level of electrical conductance when quiescent and being co... | 03/06/2007 |
| 7180798 | Semiconductor physical quantity sensing device A semiconductor physical quantity sensing device to perform electrical trimming at low cost by using a CMOS manufacturing process and a small number of terminals. The semiconductor physical quantity sensing device includes a wheatstone bridge circuit, which is a sen... | 02/20/2007 |
| 6831486 | Charge detection node with variable conversion gain and kTC noise suppression The Floating Diffusion charge detection system has incorporated a signal feedback directly into the charge-detection node. The feedback is coupled to the node from the output of the standard buffer amplifier A1 through a feedback amplifier A3, switchin... | 12/14/2004 |
| 6472748 | System and method for providing MMIC seal A system and method for maintaining desired circuit component attributes is shown. According to a preferred embodiment, a high frequency circuit component, such as a MMIC, is retained in a circuit using a degradeable material, such as silver filled epoxy,... | 10/29/2002 |
| 6011415 | Shock sensor circuitry and method for amplifying an input signal including leakage currents A shock sensor circuitry (26) is provided for processing an input signal generated by a shock sensor (28) in response to the shock sensor (28) detecting a force or shock. The shock sensor circuitry (26) includes a leakage tolerant input amplifier (38) for... | 01/04/2000 |
| 5909132 | Resistance bridge and its use in conversion systems An electrical network creates a differential voltage signal and comprises a plurality of first impedance elements of substantially equal values which are connected to form an impedance bridge. The impedance of at least one of the first impedance elements ... | 06/01/1999 |
| 5859561 | Differential load amplifier for piezoelectric sensors A differential load amplifier for receiving two measurement currents from a differential piezoelectric sensor and outputting a voltage proportional to a useful signal measured by the sensor. The differential load amplifier includes a subtraction device fo... | 01/12/1999 |
| 5821745 | Sensor signal processor having accurate digitizing capabilities Magnetoresistive elements are disposed facing a gear to form a sensor for detecting rotation of the gear. The signal output from MRE sensor is an alternating amplitude signal. An operational amplifier has a differential gain exceeding its operational limi... | 10/13/1998 |
| 5796310 | Amplification circuit using wire-bonding for adjusting amplification factor An amplification circuit comprises an operational amplifier, an input resistance unit and a feedback resistance unit. The input resistance unit consists of a plurality of input resistances connected in series, and the feedback resistance unit consists of ... | 08/18/1998 |
| 5684428 | Sensor apparatus capable of preventing high frequency noise A sensor apparatus is capable of removing RF noise. The sensor apparatus is comprised of a first power supply line connected to a power supply terminal; a second power supply line separately branched from the first power supply line and connected thereto;... | 11/04/1997 |
| 5461584 | Semiconductor sensor device A semiconductor sensor device which has a decreased number of terminals, which is cheaply and compactly constructed and which contains a trimming circuit. A power source voltage and a clock signal having a voltage level greater than the power source volta... | 10/24/1995 |
| 5450008 | Adaptive loading circuit for a differential input magnetic wheel speed sensor An adaptive loading circuit is provided for adaptively attenuating an alternating differential voltage that is produced by a magnetic sensor in response to the rotation of a wheel while maintaining noise immunity. The circuit includes an input for receivi... | 09/12/1995 |
| 5446375 | Reluctance sensor having variable threshold detection circuit A reluctance sensor produces reluctance signals in response to passing slots in a rotating wheel. When a given signal exceeds a threshold, a DIG-- OUT signal is produced. When the signal falls to zero, the DIG-- OUT signal is termina... | 08/29/1995 |
| 5396118 | Pressure detector circuit Pressure detector circuits are disclosed in which a pressure sensor is connected to an amplifier having an output signal. A three state comparator compares the output signal with a first reference voltage to provide a comparison output which is fed back i... | 03/07/1995 |
| 5396235 | Numeral setting apparatus A numeral setting apparatus for setting numerals such as copy magnification, copy density, or the like includes an operating member such as up/down keys or a volume lever and a setting device to set numerals corresponding to a magnitude of force which is ... | 03/07/1995 |
| 5304941 | Sensor detection signal extracting circuit with offset voltage cancelling ability A sensor detection signal extracting circuit comprises a sensor, a control voltage generator, an adder, an amplifier, and a low-pass filter. The control voltage generator comprises two input terminals to one of which a voltage is applied based on the volt... | 04/19/1994 |
| 5296750 | Measurand transient signal suppressor A transient signal suppressor (10) for use in a controls system which is adapted to respond to a change in a physical parameter whenever it crosses a predetermined threshold value in a selected direction of increasing or decreasing values with respect to ... | 03/22/1994 |
| 5291534 | Capacitive sensing device A digital capacitive sensing device comprises: a reference capacitor having a reference capacitance unaffected by a force to be measured; a reference pulse signal generating circuit which generates a reference pulse signal of a frequency corresponding to ... | 03/01/1994 |
| 5027015 | Non-linear conversion of input from a sensor to an output with two different slopes Pressure sensor circuit (12) develops an input sensor signal (V01) varying linearly as a function of sensed pressure (P) over a range (P1) of pressure. An error reduction circuit (14-21, R10-R14) having operational amplifiers (16, 19) and a sem... | 06/25/1991 |
| 4916339 | Signal processing for contact-sensing probe A probe (12) is connected to an interface circuit (10). The probe (12) has two different types of contact sensors, namely a piezo electric sensor and an electro-mechanical switching sensor. The trigger signal from the piezo electric sensor is detected by ... | 04/10/1990 |
| 4866640 | Temperature compensation for pressure gauge A "pressure" gauge which measures density of a gas in a vacuum system is temperature-compensated to give more accurate pressure readings by taking into account the actual gas temperature in the gauge as well as the temperature of the gas during calibratio... | 09/12/1989 |
| 4767973 | Systems and methods for sensing position and movement Sensor systems and methods for detecting the position and/or movement of an object in multiple degrees of freedom. The sensor system of the present invention comprises at least one field-effect transistor (FET), the geometrical configuration of the FET be... | 08/30/1988 |
| 4765184 | High temperature switch Downhole well bore pressure sensor capacitances for detecting pressure in a borehole and for developing electrical signals as a function of pressure. FET devices are connected between sensor capacitances and an oscillator where the oscillator is actuated ... | 08/23/1988 |
| 4749878 | Input device for control system A variable force push button is used as an input device for a control system. Specifically, a bi-directional storage device produces a command that is applied to an element to be controlled. A signal is generated having a characteristic representative of ... | 06/07/1988 |
| 4680606 | Semiconductor transducer A semiconductor transducer (10) including a substrate having a well (18) formed in one surface thereof and a semiconductor layer (14) having a first surface (26) bonded to the substrate about the periphery of the well to form a diaphragm (30) and a second... | 07/14/1987 |
| 4633099 | Feedback circuit for a semiconductor active element sensor The drain voltage of an IGFET having a channel responsive to the change in physical quantity to be measured is negatively fed back to the gate terminal of the IGFET. The negative feedback loop includes series connection of a first amplifier having an ampl... | 12/30/1986 |
| 4611129 | Signal conversion circuit An electronic circuit uses a two input operational amplifier for converting a pressure into an electrical signal. The bias potentials at the two inputs are equal to each other in the absence of pressure. The bias potential is applied to one input via a pr... | 09/09/1986 |
| 4602171 | Inhalation transducer circuit with DC drift compensation An inhalation transducer circuit is provided for use with a transducer having a variable electrical output. Early amplifier stages provide very high gain, and are subsequently a.c. coupled to stages of lesser gain leading to a microprocessor and an output... | 07/22/1986 |
| 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 |
| 4502146 | Adjustment of electronic ski binding circuitry A means for adjusting an electrical value within inaccessible electrical circuitry is disclosed including a proximity stimulus means acting upon and within the vicinity of a proximity stimulus response means to produce a response which is converted into a... | 02/26/1985 |
| 4463274 | Temperature compensation circuit for pressure sensor A circuit is disclosed for temperature compensating the output voltage thereof with respect to undesireable temperature induced signals from a pressure transducer and/or the circuit itself. The circuit comprises a pressure transducer, two operational ampl... | 07/31/1984 |
| 4339011 | Non-deflection pressure switch apparatus A piezoelectric element is arranged to receive a mechanical pressure signal and to generate a resultant voltage which is connected to a voltage threshold device for detecting a voltage signal above a predetermined threshold value. The threshold device com... | 07/13/1982 |
| 4327359 | Glass breakage detectors employing piezoresistive devices A glass breakage detector includes a cantilever assembly incorporating a base member having a first beam coupled thereto. The base assembly is secured to a pane of glass with the beam extending along an axis determined by the plane contaning the glass. A ... | 04/27/1982 |
| 4250452 | Pressure sensitive transducer circuits This relates to a circuit for delivering a linear voltage (VP) which is inversely proportional to the capacitance of a pressure sensitive capacitive transducer. A constant current IO is alternately switched into a reference capacitor... | 02/10/1981 |
| 4197478 | Electronically tunable resonant accelerometer An electronically tunable resonant accelerometer is shown wherein the frequency of a resonant peak may be adjusted over a range of frequencies. A piezoelectric element of the accelerometer is used with a seismic mass to generate an output voltage in respo... | 04/08/1980 |
| 4188549 | Acoustically responsive sensor switch A miniaturized acoustically responsive sensor switch that is responsive to localized acoustic sounds including a transducer and a conditioning circuit that is adapted to convert the audio signal produced by the transducer in response to the detection of a... | 02/12/1980 |
| 4112317 | Pulse amplitude and width detection system A pulse detection system comprises, in series, a pulse amplitude detector, pulse width detector and a recorder. The pulse amplitude detector comprises a voltage comparator having an input for receiving a voltage pulse, a reference d.c. voltage input, a gr... | 09/05/1978 |
