Abstract: A product information display system has electronic display tags for displaying pricing and product information for products in stores or warehouses. The electronic display tags are electromagnetically coupled to a conductor. A control circuit is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an a-c. power signal with the information signal and applies it to the conductor for transmission to the display tags. Each of the display tags is equipped with a coil that is electromagnetically coupled to the conductor for picking up the signals carried by the conductor. A demodulator is used to demodulate the signal picked up by the coil to obtain the original information signal. Each of the display tags is provided with a manually operated switch for initializing the tags with initial addresses transmitted by the conductor.

Abstract: A product information display system has electronic display tags for displaying pricing and product information for products in stores or warehouses. The electronic display tags are electromagnetically coupled to a conductor. A control circuit is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an a-c. power signal with the information signal and applies it to the conductor for transmission to the display tags. Each of the display tags is equipped with a coil that is electromagnetically coupled to the conductor for picking up the signals carried by the conductor. A demodulator is used to demodulate the signal picked up by the coil to obtain the original information signal. Each of the display tags is provided with a manually operated switch for initializing the tags with initial addresses transmitted by the conductor.

Abstract: A light assembly for attachment to a key, and a method of attaching a light assembly to a key are disclosed. The light assembly comprises a battery, a light source and a switch. The battery is inserted into a hole in the key. The light source is mounted on a notch on the key. The switch connects the light source to the battery. The method comprises the steps of punching a hole into a core area of the key, mounting a light source onto the key, inserting a battery into the hole, and connecting a switch from the light source to the battery.

Abstract: A power and communication system is provided for a product information display system associated with a product display or storage establishment having multiple product display or storage areas. A plurality of electronic display tags are mounted adjacent the product display or storage areas. An electrical power system supplies a/c. power to the display tags. A main power distribution loop is connected to the power supply and is magnetically coupled to multiple branch power distribution loops which extend along selected groups of display tags for supplying power to those display tags.

Abstract: A magnetic coupler for magnetically or inductively coupling a pair of conductors. The coupler includes a first magnetic core member having prongs and at least one slot between the prongs for receiving the conductors, and a second magnetic core member. The coupler further includes a base for retaining the first core member and a shuttle for retaining the second core member. The shuttle is slidably mounted within the base such that the shuttle slides across and in contact with the prongs from an open position in which the slot is exposed to a closed position in which the slot is covered by the second core member, and the conductors are thereby contained within the slot. The sliding action of the cores cleans debris off the mating surfaces of the core elements to provide good mating contact between the core members for efficient coupling.

Abstract: A product information display system has electronic display tags for displaying pricing and product information for products in stores or warehouses. The electronic display tags are electromagnetically coupled to a conductor. A control circuit is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an ac power signal with the information signal and applies it to the conductor for transmission to the display tags. Each of the display tags is equipped with a coil that is electromagnetically coupled to the conductor for picking up the signals carried by the conductor. A demodulator is used to demodulate the signal picked up by the coil to obtain the original information signal. Each of the display tags is provided with a manually operated switch for initializing the tags with initial addresses transmitted by the conductor.

Abstract: A product information display system has electronic display tags for displaying pricing and product information for products in stores or warehouses. The electronic display tags are electromagnetically coupled to a conductor. A control circuit is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an a-c. power signal with the information signal and applies it to the conductor for transmission to the display tags. Each of the display tags is equipped with a coil that is electromagnetically coupled to the conductor for picking up the signals carried by the conductor. A demodulator is used to demodulate the signal picked up by the coil to obtain the original information signal. Each of the display tags is provided with a manually operated switch for initializing the tags with initial addresses transmitted by the conductor.

Abstract: A product information display system has electronic display tags for displaying pricing and product information for products in stores or warehouses. The electronic display tags are electromagnetically coupled to a conductor. A control circuit is used to generate an information signal which contains a tag address and related data. A modulator circuit modulates an a-c. power signal with the information signal and applies it to the conductor for transmission to the display tags. Each of the display tags is equipped with a coil that is electromagnetically coupled to the conductor for picking up the signals carried by the conductor. A demodulator is used to demodulate the signal picked up by the coil to obtain the original information signal. Each of the display tags is provided with a manually operated switch for initializing the tags with initial addresses transmitted by the conductor.

Abstract: A method of assembling an electromagnetic interference filter comprises the step of disposing electrical components on a base. The components are connected to form an electromagnetic interference filter. The filter is enclosed in a metal case, which is formed by folding a metal sheet around said filter and joining the ends of the sheet together. The metal sheet has an insulating coating disposed on one side to prevent contact between the filter components and the case. The outer surface of the case is sealed with seal tape.

Abstract: A method of fabricating an electrical capacitor from a wound laminate of conductive and non-conductive materials comprises the steps of enclosing the wound laminate in a sealed chamber; drawing a vacuum on the chamber to evacuate any voids in the wound laminate, and then filling the chamber with a pressurized impregnating gas to fill the evacuated voids in the wound laminate; heating the laminate to a curing temperature; applying schoopage metal to opposite ends of the cured laminate; attaching a pair of electrical leads to the schoopage metal on opposite ends of the cured laminate, and encapsulating the cured laminate in a molded polymer.

Abstract: An integrated electromagnetic interference filter includes an inductor assembly for attenuating both common mode and differential mode electromagnetic interference conducted emissions from electronic equipment. The inductor assembly includes an outer core of permeable material defining an outer window, and an inner core of permeable material disposed in the outer window and defining an inner window. A first power lead for connecting the equipment to a source of electrical power includes a portion wound in one direction about only the outer core. The inductor assembly includes a second power lead for connecting the equipment to the source of electrical power with a portion of the second lead wound about both the inner and outer cores in the opposite direction to the winding of the portion of the first power lead. The outer core provides a magnetic path for the attenuation of common mode emissions and the inner core provides a magnetic path for the attenuation of differential mode noise.

Abstract: A multiple capacitive function wound capacitor. The capacitor includes a winding having a pair of ends and includes first, second and third insulative layers with each of the layers extending substantially from one end of the winding to the other end of the winding. The capacitor also includes a first electrode disposed between the first and second insulative layers and a second electrode located between the second and third layers. A third electrode is positioned on the side of the third layer away from the second electrode. One of the electrodes extends to one end of the winding and short of the other end while another of the electrodes terminates short of the one end but extends to the other end. The remaining electrode terminates short of both ends of the winding. A conductive tab electrically connects this last-mentioned electrode with a tab extending beyond a winding end and being insulated at the location where it passes that winding end.