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| Number | Title | Issue Date |
| 7340951 | Distributed impedance sensor An apparatus is disclosed for measuring one or more parameters of a variable physical structure, at least one of the parameters being fluid level, position, velocity or acceleration. The apparatus includes an electromagnetic sensing element comprising at least two e... | 03/11/2008 |
| 7311276 | Shredder with proximity sensing system The present invention relates to a shredder that includes a proximity sensing system to sense the presence of a person, animal, or object near cutting elements of the shredder. ... | 12/25/2007 |
| 7229385 | Wearable device A wearable device having a display element, display control circuitry connected to the display element; and a flexible body for supporting the display element, wherein the body is configured and sized to be secured onto a wearer, the body includes one or more compon... | 06/12/2007 |
| 7218498 | Touch switch with integral control circuit A touch switch apparatus for detecting the presence of an object such as a human appendage, the apparatus having a touch pad, an electric field generated about the touch pad and also having a preferably integrated and local control circuit connected to the touch pad... | 05/15/2007 |
| 7218224 | Human body detection sensor A human body detection sensor includes two oscillation circuits, a tuning circuit which connects equivalent points of the two oscillation circuits to each other, an antenna electrode which is connected to any one of the oscillation circuits so that a change in circu... | 05/15/2007 |
| 7202796 | Device and method for triggering a sensor for cables In order to provide a triggering signal for a cable stripping device that is also capable of dealing with very thin wires, it is suggested to use a piezoelectric sensor, the output signal from which is forwarded to an electronic evaluation unit. The electronic evalu... | 04/10/2007 |
| 7193833 | Electric switch An electric switch (1) comprising a capacity sensor circuit (2) provided with a signal input (3) arranged to be connected to an actuating line, and which is provided with a relay device (4) arranged to feed a current to a load line (7 | 03/20/2007 |
| 7177132 | Method and apparatus for determining a switching signal state A technique for controlling a switching circuit includes one or more sensing circuits that generate signals based upon the presence of an actuating object and upon a randomly applied strobe signal. The generated signals are sampled and are used as a for determining ... | 02/13/2007 |
| 7069941 | Electronic faucets for long-term operation An electronic faucet (10) mounted on a countertop (12) includes a housing, at least one fluid inlet line (24a, 24b) extending into the housing, a fluid outlet (46) from the housing, a solenoid (142, 143) for op... | 07/04/2006 |
| 6962228 | Contact detecting device and vehicle mounting the same A bumper sensor unit including a cord-shaped pressure sensitive sensor is fixed around a bumper of a running device to detect a contact of an obstacle based on a signal output from the cord-shaped pressure sensitive sensor. In that case, contact detecting means comp... | 11/08/2005 |
| 6885365 | Glass touch sensing circuit A glass touch sensing circuit which is capable of accurately detecting a sense signal resulting from a user's touch under no influence of variations in temperature. The glass touch sensing circuit is adapted to compare the level of an output signal from a switching ... | 04/26/2005 |
| 6442013 | Apparatus having capacitive sensor An electronic device (1), e.g. a mobile telephone having a front cover (6) and a capacitive proximity sensor, comprising: a first electrode (9; 27) and a second electrode (8; 21, 20), said first electrode having a large face (11, 12, 13; 29); and detector... | 08/27/2002 |
| 6429782 | Detection system and switch device A detection system includes a switch device having a conductor forming part of a capacitor with variable capacitance dependent upon proximity of a person, and a detector for sensing variation in the capacitance and for generating an output signal indicati... | 08/06/2002 |
| 6376939 | Sensor apparatus and safety apparatus for protecting approach to machines A sensor apparatus and a safety apparatus which can ensure significantly enhanced safety by monitoring constantly whether the sensor apparatus is operating normally. An auxiliary electrode plate of a small area is disposed in parallel and in opposition to... | 04/23/2002 |
| 5796183 | Capacitive responsive electronic switching circuit A capacitive responsive electronic switching circuit comprises an oscillator providing a periodic output signal having a frequency of 50 kHz or greater, an input touch terminal defining an area for an operator provide an input by proximity and touch, and ... | 08/18/1998 |
| 5796355 | Touch switch A touch switch (10) having multiple states, wherein an individual's body capacitance and/or body resistance is used to change the state of the switch.... | 08/18/1998 |
| 5760715 | Padless touch sensor The padless touch sensor is used for detecting a touch at a sensing location onto a dielectric element by a user coupled to earth. The sensor comprises a conductive plate attached under the dielectric element and in registry with the sensing location. A p... | 06/02/1998 |
| 5757196 | Capacitive switch actuated by changes in a sensor capacitance A capacitive proximity or limit switch comprises a capacitive probe having a sensor electrode and a guard electrode. The sensor electrode is connected to an oscillator formed by a feedback system of two operational amplifiers, of which one operational amp... | 05/26/1998 |
| 5719450 | Touch responsive electric power controller An electrical power controller includes an input filter, a touch logic and a power conditioner combining to control a power device coupled to an electrical load which in turn is coupled to an AC main power source. The controller includes an overload or sh... | 02/17/1998 |
| 5666010 | Safety system for machine tools A safety device and a supply power controller of a machine tool providing bidirectional communication for determining whether the safety device is appropriate for the particular machine tool, and whether the safety device is properly worn. The communicati... | 09/09/1997 |
| 5621290 | Movable-window safety device A window glass in a motor vehicle body is slidable in a vertical direction within a window frame by means of an electric motor controlled by "up" and "down" switches. The window glass slides with reference to a window guide channel. The window guide chann... | 04/15/1997 |
| 5572205 | Touch control system A touch control system that is responsive to a user input selection includes an electrically non-conducting substrate, such as glass ceramic, and at least one capacitive-responsive touch pad on the substrate. A source signal having a primary frequency tha... | 11/05/1996 |
| 5554973 | Electrostatic capacitance-type sensor A proximity sensor of the electrostatic type has a pulse-generating circuit and first and second delay circuits which are respectively connected to an output of the pulse-generating circuit. The first and second delay circuits are of the integrating type ... | 09/10/1996 |
| 5498914 | Capacitive sensor circuit A capacitive sensor circuit is provided which comprises: a sensor electrode (16) forming a first plate of a sensing capacitor (14) relative to a reference terminal (10), a first (2) and a second (26) inverting Schmitt trigger having the same threshold vol... | 03/12/1996 |
| 5410148 | Safety switch system with photooptical and capacitance detection A switch system for an industrial machine is described which combines both optical and capacitance switches in a switch assembly. A photo-optical switch is positioned in each assembly to provide an output signal upon the introduction of a human hand into ... | 04/25/1995 |
| 5396222 | Ergonomic machine actuator The present invention relates to a machine actuating system, which includes a hand actuator system which responds to the presence of at least one operator body part at a predetermined location by generating control signal and an actuator control system to... | 03/07/1995 |
| 5363051 | Steering capaciflector sensor A capacitive type proximity sensor having substantial range and sensitivity between a machine and an intruding object in the immediate vicinity of the machine and having a steerable sensing field has an outer electrical conductor on the machine forming on... | 11/08/1994 |
| 5276294 | Elevator button improved to function as a lock The invention prioritizes elevator service by an electronic lock and key circuit which uses a pre-existing capacitive touch button, an electronic key for receiving a 10 KHz first button pulse train from the face of the capacitive touch button and modulati... | 01/04/1994 |
| 5235217 | Capacitive press control actuation system In a preferred embodiment, a capacitive switch system including two capacitive switches which must be activated nearly simultaneously to operate a piece of equipment. When one switch is touched, a timing function is activated. If a predetermined length of... | 08/10/1993 |
| 5212621 | Proximity switched machine control method and apparatus A control station for a machine is equipped with capacitive proximity sensors in two locations for sensing the presence of operator's hands at the locations. The sensors are enclosed in a protective housing behind exterior target surfaces forming exterior... | 05/18/1993 |
| 5134259 | Palm button switch apparatus A palm button switch apparatus includes a housing, a solid palm button fixedly mounted on the housing, a guard fixedly mounted on the housing and surrounding the periphery of the palm button. A bore extends through the housing and into the palm button. Th... | 07/28/1992 |
| 4950084 | Capacitive sensor The invention relates to a capacitive sensor for the measurement, under dynamic conditions, of at least one characteristic of a turbo-machine, this sensor comprising a conductive surface intended to be fixed to the casing near a succession of rotating bla... | 08/21/1990 |
| 4937702 | Light intensity controller using a proximity sensor An apparatus for controlling the intensity and on/off status of an incandescent light bulb as a function of the proximity of an object to a sensing plate. The frequency of a signal is varied from a nominal value when the presence of the object is sensed. ... | 06/26/1990 |
| 4924122 | Low leakage, A.C. proximity-switch circuit A proximity-switch circuit operates a main switch TH1 to pass an ac supply through an external load when a metallic object is near a coil L1 that is part of an oscillator circuit. The oscillator circuit is connected to a level detector circuit controlling... | 05/08/1990 |
| 4887066 | Capacitive obstacle detector for vehicles in reverse gear The capacitive proximity sensor for motor vehicles comprises a capacitance-measuring device for measuring the capacitance between at least one capacitor plate (1) which is fixed to the motor vehicle, on the one hand, and the environment, on the other hand... | 12/12/1989 |
| 4850386 | Soil Moisture monitor A monitor or sensor for sensing the moisture content of a surrounding medium comprises two electrodes connected in a detector circuit for detecting the impedance between them and producing an output signal proportional to the impedance. At least one of th... | 07/25/1989 |
| 4831279 | Capacity responsive control circuit A capacitive detecting circuit for detecting transient capacitive changes such as that of a person moving into proximity of a sensing element. A sensing element is coupled to a threshold level controlled amplifier supplied with relatively high frequency s... | 05/16/1989 |
| 4812674 | Safety gate limit switch using Hall effect transducer A proximity switch has at least three Hall effect magnetic field sensitive transducers mounted in a transducer housing and has at least two magnets mounted in a magnet housing. The transucers produce logic signals, and a logic circuit responsive to these ... | 03/14/1989 |
| 4794273 | On/off control system for power operated hand tools An electronic ON/OFF control system for use on a powered hand tool to ensure operator safety and ease of operation. The hand tool is driven either by an electric motor driven, flexible drive shaft or a source of pressurized air supplied to the hand tool t... | 12/27/1988 |
| 4760490 | Proximity switch device A proximity switch device adapted to provide a contactless switching function for an electric device, such as a radio mounted in a vehicle when approached by an object, such as a driver's hand including a floating capacitance detector and an amplified osc... | 07/26/1988 |
