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| Number | Title | Issue Date |
| 4873667 | FIFO buffer controller A FIFO (first in first out) control circuit for providing address information to a FIFO memory uses two up counters--one to provide the write address and one to provide the read address. A multiplexer selects which addresses (read or write) are used. Two ... | 10/10/1989 |
| 4873666 | Message FIFO buffer controller A FIFO (first in first out) control circuit for providing address information to a FIFO memory uses two up counters--one to provide the write address and one to provide the read address. A multiplexer selects which addresses (read or write) are used. Two ... | 10/10/1989 |
| 4856748 | Leg assembly for a keyboard or the like A leg assembly for a keyboard is described in which the leg operates, without the use of an actuating mechanism or direct hand intervention, to be movable between two stable positions; the first being a retracted position, the second being a deployed posi... | 08/15/1989 |
| 4810956 | Mounting bracket for test probes A mounting bracket for test probes for use in testing electronic circuitry. By placing a printed circuit board (PCB) from a shelf of interconnected PCBs in an extender card connected to the shelf, a mounting bracket may be attached to the extender card. T... | 03/07/1989 |
| 4806856 | Adjustable quick-mount test probe assembly An adjustable quick-mount test probe assembly for use in circuit testing. The test probe assembly provides a convenient means for testing printed circuit boards containing Very Large Scale Integrated (VLSI) components and high density interconnect substra... | 02/21/1989 |
| 4796022 | Double transit bus system A bus system for exchanging information between a plurality of circuits connected to the system. The bus system includes a polling bus, a message bus, and a bus controller. The bus controller polls each circuit to see if the circuits require access to the... | 01/03/1989 |
| 4775996 | Hybrid telephony communication system A wireless telephony system comprising a base station and at least one portable device. The base station employs a ratio frequency (RF) receiver and an optical transmitter. The portable device employs an optical receiver and an RF transmitter.... | 10/04/1988 |
| 4771448 | Private cellular system A cellular mobile radio communication (e.g. telephone) system (hereinafter referred to as a private cellular system, PCS) that does not have the constraint of being a well defined, pre-planned system. The present invention differs from previous systems la... | 09/13/1988 |
| 4750168 | Channel allocation on a time division multiplex bus A novel method and apparatus for quickly allocating channels on a TDM (time division multiplex) bus to devices requesting access to those channels. In one embodiment, each channel of the TDM bus consists of nine bits and each device has a unique eight bit... | 06/07/1988 |
| 4736363 | Path oriented routing system and method for packet switching networks A path oriented routing system and method for packet switching networks with end-to-end internal protocols. It allows switch pairs to communicate over multiple paths without packet disordering. A distributed loop-free shortest path algorithm assigns a num... | 04/05/1988 |
| 4634039 | Solder resist paste and method of soldering A solder resist paste having the feature that it is relatively easily removed is disclosed. The paste is comprised of a liquid polyglycol (e.g. Pluronic 25R2 by BASF) and either Kaoline or talc powder. In operation, the paste is selectively applied to hol... | 01/06/1987 |
| 4574375 | Interface arrangement for a telephone system or the like An interface scheme is described which allows relatively convenient interconnection of, and re-configuration of, circuits for performing operations to digital signals from a bus. In one exemplary embodiment, a parallel bus, eight bits wide, having 320 cha... | 03/04/1986 |
| 4533896 | Fuse for thick film device A fuse is disclosed for protecting thick film devices. The fuse comprises two blocks of material mounted to the substrate that carries the thick film device. The blocks are mounted in close proximity to one another, in axial alignment, but in a spaced apa... | 08/06/1985 |
| 4503418 | Thick film resistor A novel construction for a thick film resistor is disclosed. A substrate has a first face deposited with a layer of resistive material. Between the substrate and this first layer is located a strip of conductive material. The strip of material is oriented... | 03/05/1985 |
| 4493949 | Parallel operation of telephone equipment on a digital loop Disclosed is a digital station apparatus, such as a digital telephone set, capable of being operated in parallel on a subscriber's digital loop (e.g. in an extension mode) without the need to route all the PCM signals to common equipment. Only one of the ... | 01/15/1985 |
| 4470139 | Switching network for use in a time division multiplex system A non-blocking switching network for use in a TDM (time division multiplex) system for switching digital signals carried on incoming buses to outgoing buses (e.g. in a telephone switching office) is disclosed. Each outgoing bus has associated therewith st... | 09/04/1984 |
| 4450557 | Switching network for use in a time division multiplex system A non-blocking switching network for use in a TDM (time division multiplex) system for switching digital signals carried on incoming buses to outgoing buses (e.g. in a telephone switching office) is disclosed. In one embodiment the digital signals, on eac... | 05/22/1984 |
| 4446452 | Magnitude comparator circuit and method A magnitude comparator circuit is provided for determining the largest binary number, out of a plurality of binary numbers received bit-serially, in parallel. A latch is used to store the results of the comparison and is initialized to an all logic 0 stat... | 05/01/1984 |
| 4387457 | Digital conference circuit and method A digital conference circuit for a digital telephone switching network is provided, connected between a receive TDM (time division multiplex) bus carrying PCM (pulse code modulation) words to the conference circuit and a transmit TDM bus carrying PCM word... | 06/07/1983 |
| 4369337 | Central office interface circuit An interface circuit for interconnection between a central office line and a telephone apparatus (e.g. telephone set, automatic telephone answering machine, etc.) is disclosed. The interface circuit includes a rectifier which allows the interface circuit ... | 01/18/1983 |
| 4367456 | PCM and PAM Conversion circuit including signal level variation on the PCM portion of the circuit A conversion circuit for use with digital telephone switching equipment for converting pulse amplitude modulation (PAM) signals into pulse code modulated (PCM) signals and for converting PCM signals into PAM signals. When these conversions are done it is ... | 01/04/1983 |
| 4342079 | Duplicated memory system having status indication A fully duplicated memory system for a single central processing unit (CPU) is disclosed. The memory system comprises a primary and a secondary control unit and a primary memory bank and a secondary memory bank. Each memory bank comprises one memory contr... | 07/27/1982 |
| 4313220 | Circuit and method for reducing polarization crosstalk caused by rainfall A circuit for reducing the effects of polarization crosstalk occurring on a first RF signal due to a second RF signal, wherein the first and the second RF signals are two approximately orthogonally polarized RF signals having essentially the same frequenc... | 01/26/1982 |
| 4296281 | Static, solid state originating register compatible with an electromechanical telephone cross-bar switching system A static, solid-state originating register for use with an electromechanical telephone cross-bar switching system (e.g. an NE-5* switching system by Northern Telecom) is disclosed. The static, solid-state originating register comprises a plurality of stat... | 10/20/1981 |
| 4284852 | Alternate routing for a telephone system An alternate routing scheme for a telephone system wherein a plurality of switching offices are grouped into a cluster, with each switching office in the cluster having direct trunk lines to all the other switching offices in its cluster. This allows each... | 08/18/1981 |
| 4242630 | Ferroresonant voltage regulator incorporating auxiliary winding for large current magnitudes of short duration An auxiliary winding is provided on a ferroresonant voltage regulating transformer. The transformer is controlled in such a manner that, during start-up of a load connected to the transformer, the auxiliary winding provides all the current for the load, a... | 12/30/1980 |
| 4233646 | Latching lever for printed circuit boards An improved latching lever for use with a printed circuit board (PCB). The latching mechanism comprises a hooked portion flexibly connected to the body portion of the latching lever, an actuating member solidly connected to the hooked portion for moving t... | 11/11/1980 |
| 4233528 | Sample-and-hold circuit with current gain The subject invention is a sample-and-hold circuit that provides current gain and that is suitable for construction according to LSI (large scale integration) techniques. The circuit incorporates a bipolar transistor biased on (in the "sample" mode) to a ... | 11/11/1980 |
| 4224688 | Digital conference circuit A digital conference circuit for a digital telephone switching network is provided, connected between a receive TDM (time division multiplex) bus carrying PCM (pulse code modulation) words from the conferees to the conference circuit and a transmit TDM bu... | 09/23/1980 |
| 4174534 | Master-slave voltage regulator employing pulse width modulation A pulse width modulation (PWM) converter circuit for transforming a first DC voltage into a secondvoltage (AC or DC), wherein the magnitude of the second voltage is regulated by the converter circuit. The converter circuit comprises a clock circuit, a mas... | 11/13/1979 |
| 4163287 | Binary multiplier circuit including coding circuit A binary multiplier circuit wherein the product is expressed in coded form as soon as the linear (or non-coded) product is produced. When a twelve-bit binary number is multiplied by another twelve-bit binary number a twenty-four bit binary number is produ... | 07/31/1979 |
| 4161773 | Push-pull inverter including starter circuit In a push-pull inverter (including a transformer) for changing direct current into alternating current, a circuit is disclosed for starting the inverter in which the first pulse of a rectangular pulse train applied to the transformer has a duration of one... | 07/17/1979 |
| 4156173 | Input impedance matching of a bipolar transistor employing a coaxial transformer A coaxial transformer is employed to provide impedance matching for the input of a bipolar transistor operated in the VHF frequency range. The coaxial transformer comprises a first winding wound around a ferrite toroidal core. The second winding has a sin... | 05/22/1979 |
| 4151429 | Differential charge sensing circuit for MOS devices A non-destructive sensing of mobile charge in charge transfer devices or other MOS devices is accomplished by the use of a circuit utilizing two operational amplifiers. One operational amplifier is employed as an inverting amplifier responsive to one inpu... | 04/24/1979 |
| 4127747 | Voltage boost circuit for telephone systems In a voltage boost circuit, for telephone systems where reverse battery supervision is employed, optically coupled semiconductor devices are used to control both the polarity and the charge on a nonpolar capacitor. This capacitor is powered from a DC to D... | 11/28/1978 |
