Inventor: Keith W. Kawate

Address: Attleboro Falls, MA
No. of patents: 34
Last patent issue date: 03/01/2011

Number	Title	Issue Date
7898781	Arc fault detection apparatus employing a comparator with a continuously variable threshold An arc fault detection apparatus that provides for better discrimination of electrical arcing events from nuisance loads. The arc fault detection apparatus includes an arcing sense circuit having a comparator circuit with a variable threshold voltage that varies con...	03/01/2011
7592819	Microprocessor-based capacitance measurement An improved system and method of performing capacitance measurements that provides a fast digital response and a reduced output error. The capacitance measurement system includes a circuit configuration that has a variable capacitor and at least one reference capaci...	09/22/2009
7190561	Apparatus for detecting arc faults An apparatus and method for detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense circuit, a power supply, a tripping (firing) circuit, a processor, and an electro...	03/13/2007
7190562	Method for detecting arc faults An apparatus and method for detecting arc faults that have reduced susceptibility to nuisance tripping. The apparatus includes a current sensor, an input sense circuit, an arcing sense circuit, a power supply, a tripping (firing) circuit, a processor, and an electro...	03/13/2007
6980407	Arc detection apparatus and method Current flowing through a load is monitored by a transformer (Tr1) having a small mutual inductance. The secondary coil is shorted through a rectifier circuit to deliver a charge which, in a first preferred embodiment, is connected to a log charge translator ...	12/27/2005
6765391	Low cost asic architecture for safety critical applications monitoring an applied stimulus An ASIC (14, 14′, 14″) conditions two independent outputs (VINM, VINP) of a full Wheatstone piezoresistive bridge (12) in separate conditioning paths. Each path is provided with a bridge supply voltage (VHB1, VHB2) which can serve as ...	07/20/2004
6642711	Digital inductive position sensor A differential pulse transformer having a drive coil (10a) and differential sense coils (10b) are disposed on a planar surface with a target (10e, 10f) movable over the sense coils to cause an imbalance in magnetic field when a large di/dt pulse is genera...	11/04/2003
6058783	Sensor with improved capacitive to voltage converter integrated circuit A capacitive transducer (10) which provides an output voltage in response to the application of a mechanical stimulus such as pressure or acceleration includes a signal conditioning integrated circuit (12) to which are connected a variable capacitor (C	05/09/2000
5824902	Condition responsive sensor having a signal conditioning capacitor A first embodiment of a condition responsive capacitive transducer, such as an accelerometer (1), is shown in which an electrically conductive sensor element (14) is sandwiched between upper (10) and lower (12) electrically insulative planar substrates an...	10/20/1998
5770802	Sensor with improved capacitive to voltage converter integrated circuit A capacitive transducer (10) which provides an output voltage in response to the application of a mechanical stimulus such as pressure or acceleration includes a signal conditioning integrated circuit (12) to which are connected a variable capacitor (C	06/23/1998
5767670	Method and apparatus for providing improved temperature compensated output for variable differential transformer system A variable differential transformer system (10), both linear and rotary (L/RVDT) includes a primary coil (12) drive by a primary drive (20) having a triangle wave generator whose frequency is set by an external frequency control (Rosc and C	06/16/1998
5723915	Solid state power controller A solid state power controller for switching power on and off to an electrical load which also serves as a circuit protection device protecting the load and/or the wire connected between the load output terminal of the controller and ground from thermal d...	03/03/1998
5536980	High voltage, high current switching apparatus A high voltage, high current DC switch is shown having a single pole, double throw relay and a solid state power switch such as an IGBT or MOSFET transistor. Voltage is switched by means of the solid state switch while steady state current is conducted th...	07/16/1996
5497072	Solid state power controller with power switch protection apparatus A solid state power controller for switching power on and off to an electrical load which also serves as a circuit protection device protecting the load and/or the wire connected between the load output terminal of the controller and ground from thermal d...	03/05/1996
5485345	Pressure transducer apparatus A monolithic capacitive differential pressure transducer (10, 44,) is shown composed of ceramic material having first and second cavities formed adjacent to opposed face surfaces to form first and second flexible diaphragms (12, 14; 50, 52) and a motion t...	01/16/1996
5471034	Heater apparatus and process for heating a fluid stream with PTC heating elements electrically connected in series A heater for heating fluid is shown having a plurality of self-regulating electrical resistance heater elements 22 placed in electrically and thermally conductive relationship with heat transfer members 20, 120. The heat transfer members are each configur...	11/28/1995
5444590	Solid state power controller with power switch protection apparatus A solid state power controller for switching power on and off to an electrical load which also serves as a circuit protection device protecting the load and/or the wire connected between the load output terminal of the controller and ground from thermal d...	08/22/1995
5345823	Accelerometer An accelerometer unit has a capacitor detect plate and a source place connector preferably defined respectively inside and outside a groove in one surface of a ceramic substrate. A flat metal member has an attachment portion secured in electrically conduc...	09/13/1994
5303589	Capacitive accelerometer with cantilever mount An accelerometer has a capacitor detect plate defined on an electrically insulating substrate adjacent a capacitor source plate connector and has circuit paths on the substrate connected to the detect plate and source plate connector. A resilient metal pl...	04/19/1994
5241850	Sensor with programmable temperature compensation A sensor provides an electrical signal in response to occurrence of a condition and is programmed in accordance with tested temperature characteristics of the sensor to provide selected gain and/or offset in the output signal and to compensate for change ...	09/07/1993
5239871	Capacitive accelerometer An accelerometer has a capacitor detect plate defined on an electrically insulating substrate adjacent a capacitor source plate connector and has circuit paths on the substrate connected to the detect plate and source plate connector. A resilient metal pl...	08/31/1993
5092174	Capacitance accelerometer A capacitive acceleration sensor using a common PWB as one of the plates of the capacitive transducer and the wiring connections thereto. An acceleration input moves a capacitor plate to produce a measurable change in capacitance. An electronic signal con...	03/03/1992
5068589	Supplemental automotive vehicular heater system and method of providing same A supplementary heating system particularly suitable for an automotive vehicle comprises a step down transformer coupled to the stator windings of the vehicle's alternator and a positive temperature coefficient (PTC) of resistivity heater electrically con...	11/26/1991
5057811	Electrothermal sensor An electrothermal sensor is shown having an electrically conductive substrate, an electrically insulating layer disposed on the substrate, a first thermistor disposed on a central region of the electrically insulating layer, a second thermistor disposed a...	10/15/1991
5051937	Low cost high precision sensor A universal sensor has a selectivity scaled condition responsive element such as a capacitive pressure transducer mounted on a common support with signal conditioning means embodied in an integrated circuit to provide a control signal precisely correspond...	09/24/1991
4982351	Low cost high precision sensor A universal sensor has a selectively scaled condition responsive element such as a capacitive pressure transducer mounted on a common support with signal conditioning means embodied in an integrated circuit to provide a control signal precisely correspond...	01/01/1991
4951236	Low cost high precision sensor A universal sensor has a selectively scaled condition responsive element such as a capacitive pressure transducer mounted on a common support with signal conditioning means embodied in an integrated circuit to provide a control signal precisely correspond...	08/21/1990
4876899	Torque sensing device A torque sensing device has a torque transmitting member with ends which are relatively rotatable around a member axis in response to an applied torque. Lost motion components rotating with the member ends have portions compactly extending along the membe...	10/31/1989
4866365	Supplemental automotive vehicular heater system and method of providing same A supplementary heating system particularly suitable for an automotive vehicle comprises a step down transformer coupled to the stator windings of the vehicle's alternator and a positive temperature coefficient (PTC) of resistivity heater electrically con...	09/12/1989
4827242	CMOS/bipolar integrated circuit A dual function sensor particularly useful with vehicular coolant systems indicates when a coolant liquid becomes corrosive to such cooling system materials as well as when the liquid falls to a low level condition. A reference and a sense electrode are u...	05/02/1989
4774626	Pressure sensor with improved capacitive pressure transducer A pressure sensor comprises an improved capacitive pressure transducer having a first capacitor plate secured to a limited portion of a first surface of a relatively rigid ceramic substrate and having a diaphragm with an electrically conductive surface fo...	09/27/1988
4716492	Pressure sensor with improved capacitive pressure transducer A pressure sensor comprises an improved capacitive pressure transducer having a first capacitor plate secured to a limited portion of a first surface of a relatively rigid ceramic substrate and having a diaphragm with an electrically conductive surface fo...	12/29/1987
4678982	Supplemental automotive vehicular heater system and method of providing same A supplementary heating system particularly suitable for an automotive vehicle comprises a step down transformer coupled to the stator windings of the vehicle's alternator and a positive temperature coefficient (PTC) of resistivity heater electrically con...	07/07/1987
4666582	Coolant condition sensor apparatus A dual function sensor particularly useful with vehicular coolant systems indicates when a coolant liquid becomes corrosive to such cooling system materials as well as when the liquid falls to a low level condition. A reference and a sense electrode are u...	05/19/1987

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Inventor: Keith W. Kawate