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| Number | Title | Issue Date |
| 7283898 | Seating sensor system, failure state detecting method using seating sensor and industrial vehicle with seating sensor system A seating sensor detects whether a seat is occupied by a person. A microcomputer determines whether the seat is occupied by a person based on the output of the seating sensor. If a seating signal indicating that the seat is occupied by a person is supplied continuou... | 10/16/2007 |
| 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 |
| 7132768 | Human body detecting device A human body detecting device for detecting an approach of a human body includes a sensor electrode provided in a housing and having detecting portions for detecting the approach of the human body to the housing. Each of the detecting portions is provided at a respe... | 11/07/2006 |
| 5859586 | Electronic article surveillance system An E.A.S. capable of surely detecting magnetic fluxes emitted from transmission antennas irrespective of the position of a reception coil within a tag attached to goods. In order to emit magnetic fluxes into an aisle through which customers pass, the syst... | 01/12/1999 |
| 5076566 | Self-calibrating system for detecting media movement by using capacitors as sensors A sheet movement detection system for apparatus having a sheet feed path includes a first capacitor sensor including a first pair of parallel plate members located in opposing relation on opposite sides of the feed path plane at an upstream position and s... | 12/31/1991 |
| 5035415 | System for detecting the accurate positioning of sheets along a feed path by using capacitors as sensors An improved sheet-position detection system for apparatus having a sheet feed path and a use location(s). The position detection system includes a first capacitive sensor including a first pair of parallel plate members located in opposing relation on opp... | 07/30/1991 |
| 5001459 | Escalator handrail guard warning device The location on an escalator where the handrail reenters the balustrade is provided with an electrical field projector which will establish a limited extent electrical field around the handrail reentry housing. The field is established with a pair of ante... | 03/19/1991 |
| 4691195 | Self-contained refrigerator open door indicator A device for indicating that a refrigerator door is open, includes a housing which is mountable on a refrigerator in the vicinity of the refrigerator door during the use of the device. A transducer is mountable at the refrigerator door gasket for changing... | 09/01/1987 |
| 4684931 | Capacitive sensing security system Separate signal input circuits respond to intruder disturbances of a capacitive wire sensing grid to generate signal outputs processed to reject signals caused by environmental phenomena with a high degree of statistical probability, by comparison of indi... | 08/04/1987 |
| 4661797 | Electronic warning and monitoring apparatus and electrode arrangement therefor The invention relates to a monitoring and warning apparatus for automatic processing apparatuses, in particular robots. Reactance-determining elements are arranged as sensors on the movable parts of the robot. If the robot arm approaches an object, detuni... | 04/28/1987 |
| 4420745 | Security system A security system of the bridge circuit type has in one of its arms a conducting element whose impedance is to be monitored and in its other arms reference and/or compensating elements, for detecting an unbalance of the bridge resulting from a sudden chan... | 12/13/1983 |
| 4352090 | Detection and alarm device for use with car for detecting obstacle and abnormal conditions of tire An automobile detection and alarm device detects obstacles near the automobile and abnormal conditions of tires on the automobile. An oscillator is provided which either oscillates or does not oscillate depending upon the value of a capacitance present be... | 09/28/1982 |
| 4300116 | Safety method and apparatus for sensing the presence of individuals adjacent a vehicle An improved safety method and apparatus for sensing individuals adjacent a vehicle utilizes a balanced bridge circuit. The method and apparatus provides for rebalancing the bridge circuit at a first rate during vehicle motion to compensate for topography ... | 11/10/1981 |
| 4208695 | Proximity detector A proximity detector comprises a pair of antennae being disposed along the front edge of a door and at a space therebetween, a pair of coils constituting series resonance circuits, together with each electrostatic capacities of the antennae which are conn... | 06/17/1980 |
| 4063447 | Bridge circuit with drift compensation A bridge circuit having reference and measurement thermistors in respective adjacent arms is automatically readjusted to off-set any long term drift of the thermistors. The readjustment of the bridge circuit is performed between normal measurement operati... | 12/20/1977 |
| 3947734 | Electronic personnel safety sensor An electronic personnel safety sensor is provided capable of causing a machine or operation to be shut off to prevent injury to personnel or damage to equipment protected, by detecting, indicating, and acting upon a predetermined increase or decrease in e... | 03/30/1976 |
| 3939770 | Short range passive electromagnetic detector A short range passive detector for detonating a mine comprising a bridge cuit which utilizes the mine tripwire wire-to-ground capacitance as one arm of the bridge and associated circuitry for zero adjusting the bridge automatically to render the bridge i... | 02/24/1976 |
