Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 5131990 | Fluoropolymer humidity sensors A humidity sensor composed of interdigitated electrodes and a material therebetween which is composed of Nafion wherein H+ cites have undergone ion exchange with at least one of NH4+ and Li+, Na+, Ag+ and Mg+.... | 07/21/1992 |
| 5112234 | Printed circuit connector apparatus and method of making same A printed circuit board connector is shown having an elongated body of electrically insulating material in which several rows of apertures extend from a flat surface on one side, each row extending to one of a series of platforms on an opposite side space... | 05/12/1992 |
| 5107237 | Circuit breaker apparatus A sub-miniature circuit breaker particularly suited for use with aircraft simulators is shown which has the same look and feel of circuit breakers used in aircraft. The circuit breaker has a push-pull/actuator and ball latch mechanism and a solenoid opera... | 04/21/1992 |
| 5101549 | Method for making pressure responsive switch A pressure responsive switch having upper and lower contact assemblies with a snap acting member and an electrically conductive member sandwiched therebetween. The assemblies each include an insulating body with a hollow center and an electrically conduct... | 04/07/1992 |
| 5093782 | Real time event driven database management system A method for storing and accessing data in the operation of a program driven computer system for carrying out an industrial process, which system includes a non-volatile, long access time memory medium and a volatile, short access time memory medium, whic... | 03/03/1992 |
| 5078115 | Heating device A thermally and electrically conductive housing having a solid tip portion is shown mounting a heating element thermally and electrically coupled to the tip portion which in turn is electrically coupled to a switch mechanism mounted within the housing. Th... | 01/07/1992 |
| 5077537 | Thermostatic probe switch apparatus A probe thermostat is shown having a single, stamped metal channel having a first coefficient of expansion coupled to a rod having a second, different, coefficient of expansion. An electrically insulating block is mounted on the channel which in turn cant... | 12/31/1991 |
| 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 |
| 5060520 | Hermetic pressure sensor A pressure sensing element having a housing including a flexible membrane receiving portion, a flexible disc member of predetermined shape secured within the housing, and a flexible membrane disposed within the housing, the flexible membrane being substan... | 10/29/1991 |
| 5060108 | Packaging and sealing for pressure transducer A pressure transducer having a capactive pressure sensing moudle disposed in a housing is biased against a sealing ring disposed in a chamber circumscribing a fluid pressure inlet by a retainer ring mounted in the housing. A selected back-up washer may be... | 10/22/1991 |
| 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 |
| 5057746 | Current sensing relay A three pole relay is shown which operates in response to the flow of normal operating current across fluorescent lamps to energize a coil which actuates a relay to open switches disposed in all of the filament lines associated with the lamp to shut off f... | 10/15/1991 |
| 5055726 | Plug-on protector for compressor motor Electrical terminal pins (start, main and common) mounted in a glass header to provide electrical connection to a compressor motor are shown with a motor protector disposed on one of the pins in such a fashion that opposite-direction-oriented right angle ... | 10/08/1991 |
| 5053908 | PSC motor start system A motor winding system having a main winding and a start winding circuit with a start winding and a PTC resistor in series therewith wherein the resistor is electrically removed from the circuit at a predetermined time after motor starting and remains in ... | 10/01/1991 |
| 5051717 | High limit thermostat apparatus A high limit thermostat for gas furnace applications is shown having a molded base plate and an elongated housing formed integrally with the base plate which mounts a thermostat at a free end of the housing in order to be positioned within an air stream o... | 09/24/1991 |
| 5049708 | Normally closed pressure responsive switch A normally closed pressure responsive switch has upper and lower housings attached to one another with an electrically conductive snap acting disc placed therebetween. The lower housing includes a base having a recessed area in which a stationary electric... | 09/17/1991 |
| 5044202 | Pressure transducer apparatus A pressure responsive variable capacitive transducer is shown in which a flat flexible diaphragm having a capacitor plate disposed thereon is mounted overlying a recess in a substrate having a capacitor plate disposed on the surface of the recess so that ... | 09/03/1991 |
| 5045828 | Fluoropolymer humidity sensors A humidity sensor composed of interdigitated electrodes and a material therebetween which is composed of perfluorosulfonic acid substituted poly (tetrafluoroethylene) copolymer wherein H+ sites have undergone ion exchange with at least one of NH4+ and Li+... | 09/03/1991 |
| 5043691 | Ambient compensated thermostat A temperature responsive electric switch is shown having an operating bimetallic member adapted to sense the temperature of a heat source coupled to an over-center switch mechanism and an ambient temperature bimetallic member to maintain a predetermined t... | 08/27/1991 |
| 5040292 | Method of forming dielectric layer on a metal substrate having improved adhesion The bond of a layer of glass dielectric material applied to metal substrates of the type which are capable of forming solid solutions with copper is enhanced by first coating the substrate with a layer of thick film copper, curing the thick film at a temp... | 08/20/1991 |
| 5038272 | Device for tracking and recording the position reached by a moving part, in particular for industrial-robot control The device is intended to be used for recording the position reached by a moving part, such as the arm of an industrial robot moved by a rotary motor (M). The device comprises, in an assembly capable of being associated with the said moving part, an angul... | 08/06/1991 |
| 5034848 | Low pressure sensor Differentially connected capacitive sensors are mechanically coupled with the flexible capacitor plate of one sensor coupled to the source of pressure to be measured, the flexible capacitor plate of the other sensor coupled to ambient pressure. In a secon... | 07/23/1991 |
| 5025667 | Hermetic pressure sensor A pressure sensing element having a housing including a flexible membrane receiving portion, a flexible disc member of predetermined shape secured within the housing, and a flexible membrane disposed within the housing, the flexible membrane being substan... | 06/25/1991 |
| 5021736 | Speed/position sensor calibration method with angular adjustment of a magnetoresistive element A transducer arrangement comprising a magnetoresistive transducer including a magnetoresistive element responsive to magnetic flux passing therethrough in a predetermined direction to change its electrical resistance as a function of the intensity of the ... | 06/04/1991 |
| 5015808 | Normally open pressure switch A normally open pressure responsive switch having upper and lower housings with a snap acting member and an electrically conductive member sandwiched therebetween. The housings each include a body with a hollow center portion and the lower housing has a c... | 05/14/1991 |
| 5004954 | Current sensing relay A three pole relay which operates in response to the flow of normal operating current across fluorescent lamps to activate a coil, the coil coperating a relay to open switches disposed in all of the filament lines associated with the lamp to shut off fila... | 04/02/1991 |
| 5004876 | Pressure responsive switch particularly adaptable for operation as a normally open or a normally closed switch A pressure responsive switch having upper and lower contact assemblies with a snap acting member and an electrically conductive member sandwiched therebetween. The assemblies each include an insulating body with a hollow center and an electrically conduct... | 04/02/1991 |
| 4990830 | Current sensing relay A three pole relay is shown which operates in response to the flow of normal operating current across fluorescent lamps to energizes a coil which actuates a relay to open switches disposed in all of the filament lines associated with the lamp to shut off ... | 02/05/1991 |
| 4981450 | Connector apparatus A high reliability low cost connector has flat retainers blanked from an electrically conductive sheet metal and inserted into an opening in an electrically insulating body. Each retainer has a post at one end extending from an opening at one side of the ... | 01/01/1991 |
| 4972717 | Pressure transducer apparatus and method for making same A pressure responsive variable capacitive transducer is shown in which a flat flexible diaphragm having a capacitor plate disposed thereon is mounted overlying a recess in a substrate having a capacitor plate disposed on the surface of the recess so that ... | 11/27/1990 |
| 4967042 | System for enhancing current carrying capacity of printed wiring board The disclosure relates to a printed wiring board system including a printed wiring board having an electrical conductor on one surface thereof, a pair of apertures extending through the printed wiring board, an electrically conductive jumper extending thr... | 10/30/1990 |
| 4950972 | Alternator system for automotive vehicles An automatic alternator is coupled to both a step up and a step down transformer. The outputs from the transformer are rectified and connected respectively to a windshield heater and to a circuit comprising the normal 14 volt car loads and the battery. A ... | 08/21/1990 |
| 4951025 | Thermally monitored electrical outlet receptacle receptacle apparatus An electrical outlet receptacle is shown having a thermally responsive switch disposed within the receptacle thermally coupled to components of the receptacle and adapted to interrupt power thereto upon the occurrence of overload or overtemperature condit... | 08/21/1990 |
| 4939495 | Circuit breaker with auxiliary status indicating switch A circuit breaker is shown having movable contacts carried by an operating member which moves between a circuit breaker contacts closed position and a circuit breaker contacts open position. An auxiliary switch has electrically conductive, flexible contac... | 07/03/1990 |
| 4936010 | Method of forming dielectric layer on a metal substrate having improved adhesion The bond of a layer of glass dielectric material applied to metal substrates of the type which are capable of forming solid solutions with copper is enhanced by first coating the substrate with a layer of thick film copper, curing the thick film at a temp... | 06/26/1990 |
| 4921165 | Automotive oil level control valve apparatus A fluid level control valve has a base with an aperture formed therein. A cover is slidingly disposed over the aperture and is biased by a thermostatic element in a direction tending to close the aperture. In one embodiment the thermostatic element is an ... | 05/01/1990 |
| 4903164 | O-ring/back-up ring seal for high pressure transducers A pressure transducer having a pressure sensing surface spaced from an interior surface of the transducer housing by a relatively rigid back-up ring which contacts each of the pressure sensing surface, the interior surface of the housing and an interior s... | 02/20/1990 |
| 4894643 | Appliance door alarm apparatus An aural or visual alarm is arranged to be actuated upon leaving a door to an appliance open longer than a preselected period of time. An automatically resettable disarming device may be included to permit leaving the door open intentionally for an extend... | 01/16/1990 |
| 4894634 | Switch device A thermostatic switch is shown in which a movable arm mounting a movable contact and a snap acting thermostatic strip disc are cantilever mounted with the disc adapted to cause the movable contact to move out of engagement with a stationary contact at a s... | 01/16/1990 |
| 4876523 | Switch for circuit breaker A switch is shown having a thermostatic member which deforms in response to variations in temperature to thereby control the state of energization of the switch. The thermostatic member is shown cantilever mounted or centrally mounted using material to af... | 10/24/1989 |
