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| Number | Title | Issue Date |
| 4809270 | Variable time slot communication system A time division communication system having peripheral devices controlled om a port circuit is arranged such that the port circuit may have assigned to it a variable number of time slots for any peripheral device associated therewith. Each port circuit ha... | 02/28/1989 |
| 4805094 | Multi-channel memory access circuit In many situations, contiguous data is not stored at contiguous locations within a memory. This fact alone causes an increase in processor time for retrieval purposes or the intervention of a memory management unit of some type. The situation is compounde... | 02/14/1989 |
| 4715044 | Automatic synchronous/asynchronous modem There is disclosed an arrangement which enables a single modem port to be used for either synchronous or asynchronous data transmission, with no manual changes required. The modem determines whether the incoming call is synchronous or asynchronous by dete... | 12/22/1987 |
| 4672299 | Clock control circuit for phase control There is disclosed a clock circuit for a PBX system that uses phase locked loop technology to perform synchronization between two input signals. The system can switch between different reference sources without introducing error and without requiring the ... | 06/09/1987 |
| 4653090 | Graphics based call management There is disclosed a method of setting up, manipulating, and taking down communication connections. The telephone instrument would include a graphics screen, such as a PC, and a series of call appearance boxes would be represented on the screen. Each poss... | 03/24/1987 |
| 4611875 | Communication system cross-connect field power adapter A power adapter is disclosed for use in connecting electrical power to a telephone station via a cross-connect jack. The power adapter has a plug-end for mating with the cross-connect field and a jack-end for receiving a cross-connect patch cord. The powe... | 09/16/1986 |
| 4604500 | Multiprocessing interrupt arrangement There is disclosed an interrupt arrangement for use in a multiprocessing system where it is desired to specifically direct interrupts from one processor to any other processor. The arrangement treats the interrupt signal as a data communication between pr... | 08/05/1986 |
| 4578531 | Encryption system key distribution method and apparatus Encryption systems typically rely on the distribution of cipher keys between terminals for scrambling and unscrambling transmitted messages. Elaborate security precautions are necessary to protect the cipher keys since a compromise of the key could result... | 03/25/1986 |
| 4557411 | Interconnected solder pads and the method of soldering A new soldering technique is being employed whereby solder is formed into pads, each pad connected to the next pad by a solder link. The pads are formed on center spacings equal to the spaces between assembly board terminals and heated to the melting poin... | 12/10/1985 |
| 4554412 | Resistive line circuit Resistive battery feed circuits are normally not used because of lack of power supply noise rejection and attendant crosstalk coupling. In this circuit the opamp and surrounding circuitry insure that power supply and ground noise do not couple into the ti... | 11/19/1985 |
| 4542375 | Deformable touch sensitive surface A touch sensitive device is arranged with substantially parallel surfaces inside which light from a synchronized source, such as a CRT, can become trapped by total internal reflection. The screen is fitted with photodetectors which respond to the entrapme... | 09/17/1985 |
| 4536052 | Modular cross-connect panel There is disclosed a cross-connect having a hinged rotating section panel which accepts multi-pair cables. The hinged section is mounted to a forward edge of a support section and the multi-pair cables are suspended between the two sections so that the ca... | 08/20/1985 |
| 4535448 | Dual bus communication system A dual set of busses is used to provide close coupling between the data and voice services of the CS300 communication system. One of these busses is a time division multiplex bus arranged for communication between port access circuits, and the other bus i... | 08/13/1985 |
| 4528681 | Button depression click generator When using membrane key pads, it is often desirable to provide the user with a sense that contact has been made. In this regard, there is disclosed a 1 KHz 4-bit counter which is normally held at a count just beyond the place where "ones" appear in the th... | 07/09/1985 |
| 4525860 | Character recognition arrangement There is disclosed an algorithm for electronically recognizing characters. The algorithm relies upon the establishment of a particular standard "name" for each character. A name is a sequence of "u"s, "d"s, "l"s, "r"s, and "-"s that describes the path tha... | 06/25/1985 |
| 4519032 | Memory management arrangement for microprocessor systems A memory management system is structured for use with a self-contained microprocessor to form a multi-user computer. The system operates to establish user and kernel modes each having different operating permissions. When the system is operating in the us... | 05/21/1985 |
| 4513281 | AC plasma panel shift with intensity control There is disclosed an ac plasma panel having gray tone and color control. The plasma panel is constructed using a matrix of discharge sites, each site associated with one or more migration sites. The migration sites, in turn, have phosphor areas in conjun... | 04/23/1985 |
| 4512016 | Digital communication station signaling control There is disclosed a processor controlled digital communication device which accepts message commands from a communication system as part of a communication protocol. These command messages are stripped from the protocol and combined within the communicat... | 04/16/1985 |
| 4512017 | Digital dual channel communication terminal There is disclosed a digital telephone having dual voice and data handling capability over a single communication line. Time separated information channels are used to transport the voice and data information between the terminal and the main processor. A... | 04/16/1985 |
| 4510351 | ACD Management information system There is disclosed an ACD management information system which tracks attendant work performance without regard to the actual station at which the attendant is operating. The system also monitors non-ACD work states and provides individualized status repor... | 04/09/1985 |
| 4486833 | Microprocessor peripheral control circuit Microcomputers are typically designed having a cycle time during which peripheral devices are accessed. This cycle is subdivided such that during a device access certain signals sequentially are activated to control the flow of data to or from the device ... | 12/04/1984 |
| 4484179 | Touch position sensitive surface A touch sensitive device is arranged with substantially parallel surfaces which are at least partially transparent to light. A flexible membrane is supported above the top surface of the screen and when the overlay is flexed into contact with the screen, ... | 11/20/1984 |
| 4475191 | Distributed time division multiplexing bus High density time division busses suffer from many problems, one of which is that impedance discontinuities cause signal reflections to occur along the bus. These reflections, in turn, affect the settling time and noise margins of the bus and thus reduce ... | 10/02/1984 |
| 4453217 | Directory lookup method and apparatus There is disclosed a spelling correction arrangement for use in directory lookup applications. The arrangement corrects errors by finding the name in the directory that most closely resembles the name requested by the user. The arrangement is based on a r... | 06/05/1984 |
| 4451705 | Call completion circuit and method There is disclosed a combined business communication system and an ACD system where each station in the system is available to handle, on a per call basis, either ACD or regular incoming calls. The system is arranged to accept from any user at any station... | 05/29/1984 |
| 4449017 | ACD Combined handset and headset arrangement When a standard business office communication system is combined with ACD features, it is necessary to design the system to accommodate a variety of operational modes. Two such modes are handset operation, where a station user talks and listens via a conv... | 05/15/1984 |
| 4445213 | Communication line interface for controlling data information having differing transmission characteristics There is disclosed an office communication system adapted to handle both bursty and continuous data transmission over a single transmission facility to a central switching network. A programmable station controller is used at each station location to inte... | 04/24/1984 |
| 4445008 | Snap-together housing A snap-together housing is disclosed having a single fastener holding the multi-part housing together. The housing has a base, around which upper and lower panels fit in a clamshell arrangement. The wrap-around panels provide design contours and are the c... | 04/24/1984 |
| 4439761 | Terminal generation of dynamically redefinable character sets A graphic display terminal is arranged to receive from a sending source drawing instructions containing the description of a display character. The terminal, under control independent from the sending source, interprets each received drawing instruction i... | 03/27/1984 |
| 4430526 | Interactive graphics transmission system employing an adaptive stylus for reduced bandwidth An interactive graphics transmission system for use, illustratively, in video teleconferencing is described which advantageously reduces the amount of transmission bandwidth and user effort required to transmit changing graphical information. This is acco... | 02/07/1984 |
| 4429256 | Selective shifting ac plasma panel An ac plasma panel is arranged with selective row and column shifting capability. Shifting in both the horizontal and vertical directions is accomplished by arranging for display site discharge transportation under control of eight control conductors with... | 01/31/1984 |
| 4424418 | Communication system parkhold conferencing A communication system is arranged having a special hold mode (called parkhold) where a station may place any conference connection associated with that station in the parkhold mode. Any station in the system may, by transmitting a certain signal, become ... | 01/03/1984 |
| 4412313 | Random access memory system having high-speed serial data paths To substantially increase the bandwidth of a random access memory (RAM), a shift register is disposed within the memory array such that the shift register lies parallel to the word lines and is connected to at least individual ones of the bit lines contai... | 10/25/1983 |
| 4395765 | Multiport memory array In a memory array, dual port capability is achieved by an arrangement of the memory cells such that for each cycle of the memory operation two accesses may be performed. This result is achieved by taking advantage of the bit line precharging interval. A s... | 07/26/1983 |
| 4389720 | Distributed digital conferencing system In time division communication systems one conference technique is to have a processor combine those samples going to a particular station forming a conference having as many subcombinations as there are stations. This approach, while allowing individual ... | 06/21/1983 |
| 4385212 | Expandable communication terminal housing An expandable telephone housing has been developed which allows for easy lateral expansion. The housing contains front and rear slides and an end cap which is removable. For expansion the end cap is removed exposing a mating mechanism for locking to an ex... | 05/24/1983 |
| 4385207 | Line powered transformerless loudspeaking telephone A line powered loudspeaking telephone is implemented entirely from electronic components, eliminating inductors and transformers. A three stage (521, 523, 525, 532) output amplifier is used with the loudspeaker impedance forming the output stage impedance... | 05/24/1983 |
| 4382295 | Digital conference time slot interchanger A time slot interchanger is disclosed for selecting and buffering digital signals between buses. The arrangement is particularly useful in forming conferences in a distributed digital time division system. In one embodiment, a clock is used to generate ti... | 05/03/1983 |
| 4354122 | Voltage to current converter In situations where it is desired to provide an extremely accurate output current generated from an input voltage, errors occur in the conversion. Conventional solutions depend upon operational amplifiers and rely upon the availability of both positive an... | 10/12/1982 |
| 4346376 | Touch position sensitive surface A touch sensitive device is arranged with substantially parallel surfaces inside which light from a synchronized source, such as a CRT, can become trapped by total internal reflection. The edges of the device are fitted with photodetectors which respond t... | 08/24/1982 |
