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| Number | Title | Issue Date |
| 4176252 | Multi-dimensional audio projector Apparatus for projecting movement of audio signals employs a plurality of variable-gain amplifier stages, the gain thereof being controlled by the states of an associated plurality of counters and decoders, to provide a spatial distribution of audio signa... | 11/27/1979 |
| 4168403 | Key telephone system comprising only one control lead per outside line A key telephone system for a predetermined number of outside lines comprises only one control lead shared per outside line by cables connected between a key service unit and key telephone sets, respectively. Each telephone set has manually operable keys f... | 09/18/1979 |
| 4167655 | Push button to rotary dial converter systems A push button to rotary dial converter system for converting push button telephones to provide rotary dial type pulsed outputs. The system provided is universal and can be used with almost any subscriber set that is made to provide push button signals to ... | 09/11/1979 |
| 4165447 | Centralized data-registration equipment for traffic supervision in telecommunication system To facilitate the supervision of long-distance telephone traffic over an extended area, output signals from call monitors associated with a number of trunk lines are fed to respective detectors working into a common preprocessor in which certain parameter... | 08/21/1979 |
| 4164630 | Combined telephone index and keyboard for dialer A telephone card index, having a switch connected to the card finder for initially locking on to a memory section of a miniprocessor, a key aligned with each name line of the card locates the exact memory address of the number to be called with pre-record... | 08/14/1979 |
| 4164632 | Signalling system for overvoltage protectors A system for signalling the fact that the fuses and limiting diodes in the connecting circuits of telephone lines are defective. Use is made of the rest supply resistors already present in the connecting circuits and the loop detector which is normally us... | 08/14/1979 |
| 4161634 | Count-down addressing system A system is described for randomly addressing any one of a plurality of remotely located stations connected by means of an electromagnetic wavepath. At the addressing point an addressing signal, comprising a series of m signal bursts, is generated and cou... | 07/17/1979 |
| 4161626 | Telephone time recorder A method and apparatus is provided wherein the total elapsed time for a series of outgoing calls on a plurality of call lines of a telephone is accumulated for each of those lines by a plurality of clocks and switches operating in a monitoring circuit for... | 07/17/1979 |
| 4161635 | Address verification system An address verification system is described for use in a communications system comprising a transmission path (14) having sequence of remote stations (1, 2, ... n) distributed therealong. After accessing the desired station, a loop-back (32) is establishe... | 07/17/1979 |
| 4160880 | Modular termination system for communication lines A modular termination system includes one or more first terminal block modules aligned side by side and second terminal block modules spaced vertically below the first modules. Jumper routing modules are interposed between the first terminal block modules... | 07/10/1979 |
| 4160879 | Telephone display accessory An accessory attaches to the outside of a dial telephone, fits around the dial, and has a main switch actuated by movement of the handset of the telephone. The accessory includes a rotatable element arranged to encircle the dial and a dialing switch respo... | 07/10/1979 |
| 4160131 | Electronic key telephone system An electronic key telephone system is disclosed that provides a plurality of telephone features and functions, while only requiring a four-wire line between the central equipment and each key-set telephone (KST) and a two-wire line between the central equ... | 07/03/1979 |
| 4159400 | Toll fraud detector A detector for a "Black Box" toll fraud is connected to circuits at the called party's central office and comprises a relay connected in series with the called subscriber's tip (T) lead, a fraudulent call register or indicator, and a normally open time de... | 06/26/1979 |
| 4158755 | Telephone system open switching interval protection circuit A circuit which can be appliqued to external terminals of a prior art key telephone line circuit to protect the circuit from prematurely cancelling a customer-applied holding condition when the central office exhibits an open switching interval (OSI) cond... | 06/19/1979 |
| 4158111 | Exclusion system for a key telephone system The exclusion system is employed with a central office/private branch exchange (CO/PBX) system and a party line paging and intercom system. A first circuit is coupled to the "A" lead of the party line system and is responsive to a predetermined potential ... | 06/12/1979 |
| 4158112 | Hands-free answer arrangement on intercom for key telephone system An intercom arrangement in a key telephone system is disclosed that permits the answering of intercom calls "hands-free" at a called station. Intercom calls are originated in the standard manner, with the calling party lifting the handset at a station and... | 06/12/1979 |
| 4156109 | Electronic traffic measuring, sorting, and recording device The invention described is an electronic device for traffic measurement in telecommunication networks. The device measures the two main parameters of the carried load, known mathematically as the mean and variance of the number of calls in progress from w... | 05/22/1979 |
| 4154205 | Capacitor ignition system for internal-combustion engines A capacitor ignition system for an internal-combustion engine of the type which basically includes a direct voltage converter and, having a control circuit coupled therewith for cyclically charging a storage capacitor, a switch-through circuit for dischar... | 05/15/1979 |
| 4153020 | Method and apparatus for spark control of engine knock Knocking sounds in an internal combustion engine are detected by a transducer, amplified, filtered to the knock frequencies, rectified and integrated to provide for each knock a DC pulse representative of the intensity of the knock. This DC pulse is fed t... | 05/08/1979 |
| 4151369 | Sound reproduction systems A basic decoder designed to feed signals to at least three loudspeakers disposed at respective azimuths around a reference point at equal distances therefrom is modified to make it suitable for feeding loudspeakers at the same azimuths but at non-uniform ... | 04/24/1979 |
| 4151372 | Message registration pulse generator An apparatus for generating message unit pulses for message rate billing which includes means responsive to answer pulse recognition signals and electronic answer supervision from a central office for providing separate and variable numbers of pulses per ... | 04/24/1979 |
| 4149030 | Multi-drop communications device A digital data modem arrangement is disclosed for use in a multi-drop communication system using either telephone lines or a pair of conductors. The communications device connected to a communications channel is readily adapted to a voice grade telephone ... | 04/10/1979 |
| 4147895 | Expandable memory for the suppression of phase jitter in a telecommunication system Binary message signals arriving over a PCM link at a retransmitting station, with a predetermined average bit cadence subject to random variations, are cyclically written in an 8-stage buffer register under the control of an 8-pulse writing counter steppe... | 04/03/1979 |
| 4147147 | Internal combustion engine ignition system A magnetic pulser having an energizing winding and a set of normally closed contacts is connected in the ignition system of an internal combustion engine with the contacts in series with the primary winding of the ignition system coil and the energizing w... | 04/03/1979 |
| 4146746 | Device for computing and displaying the price of a service This device comprising a pulse receiving circuit, a computer interface circuit responsive to a logic adaptor circuit and delivering, as tax accumulation data are delivered to the device, a signal corresponding to the price of each unitary tax, an adder ci... | 03/27/1979 |
| 4146753 | Transmit/receive network for telephone-subscriber station A receiving amplifier AR and a transmitting amplifier AT at a telephone-subscriber station have operating circuits in respective diagonals A-D and B-C of a bridge circuit whose four impedance arms are formed by two fixed resistances Z1, Z2... | 03/27/1979 |
| 4145581 | Automatic telephone dialer for use in intrusion detection systems An automatic telephone dialer is described which includes a dial tone detection circuit. The dial tone detection circuit responds to a series of tones which are prerecorded on a magnetic tape. The dial tone detection circuit operates to detect the tones a... | 03/20/1979 |
| 4144413 | Rotary telephone dial A rotary telephone dial, in which at least one shaft is fixedly planted on a base plate. A rotary member is rotatably mounted on the shaft. Another base plate is engaged with the free end of the shaft to support the shaft. One direction assembling can be ... | 03/13/1979 |
| 4143243 | Telephone system A telephone set which will automatically redial a telephone number after a busy signal has been received and continues redialing that number until the party being called answers, or until a predetermined number of attempts have been made. As the user dial... | 03/06/1979 |
| 4140088 | Precision fuel injection apparatus A fuel injection control system and technique for an internal combustion engine is disclosed having at least one controlled offset fuel injector valve and only one controlled trim injector valve. The offset injector valves produce a constant quantity of f... | 02/20/1979 |
| 4140883 | Keyboard with selective key entry block Particular keys are provided with locking arms that may or may not enter a duct filled with balls and being displaceable in the duct only if a locking element is not inserted. That element will be inserted when keys having said locking arms must not be de... | 02/20/1979 |
| 4140885 | Modular interchange termination system A termination system, in particular for key telephones, is constructed on a modular basis and includes programmable termination fields for flexibility in providing and altering key telephone functions, and plug-in connection of the telephone instruments a... | 02/20/1979 |
| 4138983 | Engine ignition system with electromagnet control of enclosed distributor gaps The cathode of the gas-discharge devices performing the distributor function for associated sparkplugs have lateral extension flanges approaching closely to the insulating envelopes of the devices. A grounded control electrode just outside the gas-dischar... | 02/13/1979 |
| 4139741 | Phone guard for locking out long-distance calls A telephone lock for attachment to a telephone permits a user to dial local calls only with a first predetermined number of digits. Upon lifting a receiver/speaker from a cradle connected to the telephone lock, a counting device counts the first number of... | 02/13/1979 |
| 4139731 | Telephone conference system with active analog conference A telephone conference system includes a conference bridge for coupling multiple conference ports associated with corresponding conference stations. The bridge includes means for summing incoming signals from all the conference ports and supplying the sum... | 02/13/1979 |
| 4139736 | Central office coin repeater modification circuit There is provided a modification circuit for prepay telephone central office coin repeaters. The modification circuit includes an improved coin detector circuit that may be used with a circuit for providing coin-free dialing for certain predetermined numb... | 02/13/1979 |
| 4138599 | Modular communication system having self-identifying modules Trunk and line circuits packaged as modules are provided with circuitry for generating self-identifying type-code information which is retrievable on request by the central control unit of the system. The received information is compared with the type-cod... | 02/06/1979 |
| 4136262 | Telephone paystation A high security full prepay telephone paystation utilizes a low current escrow unit and a coin counter for determining the amount of money deposited in the escrow. Also, circuitry is provided for sensing whether any money at all has been deposited in the ... | 01/23/1979 |
| 4133985 | Key telephone system To convert a multiple line, multiple telephone set installation into a key telephone system, a control unit is provided at each telephone set. The control unit includes a regulated power supply, a control circuit, pushbutton line select and hold switches,... | 01/09/1979 |
| 4133325 | Engine spark timing system and method with supplementary retard in normal and starting modes An engine spark timing system includes pulse generating apparatus effective to generate conventional spark timing pulses, apparatus, including a first capacitor, effective to vary the voltage across the first capacitor in one direction at a first rate tow... | 01/09/1979 |
