Patents Assigned to Northern Electric Company Limited
  • Patent number: 4150428
    Abstract: A method for substituting one memory module for another, faulty, memory module comprises designating and marking a memory module as the substitute module, which, upon detection of a fault in the other memory module, is inhibited from responding to its own address when called, and responds to the address of the faulty module whenever the latter is called.
    Type: Grant
    Filed: November 18, 1974
    Date of Patent: April 17, 1979
    Assignee: Northern Electric Company Limited
    Inventors: Scott A. Inrig, Alan S. J. Chapman
  • Patent number: 4149772
    Abstract: An optical fibre has a core and a plurality of rings surrounding the core. In one arrangement the core and subsequent alternate rings are light transmitting, while the intermediate rings are of cladding material. In an alternative arrangement the core and alternate rings are of cladding material and intermediate rings are light transmitting. The light transmitting rings can be of varying refractive index or of constant refractive index.
    Type: Grant
    Filed: November 28, 1977
    Date of Patent: April 17, 1979
    Assignee: Northern Electric Company Limited
    Inventors: Rama Iyengar, Felix P. Kapron
  • Patent number: 4131690
    Abstract: A method of producing an insulated electrical conductor, in which a wire conductor is coated with an inner layer of heat resistant material and covered with electrostatically deposited powdered polymeric material which is fused by heat to form an outer layer of insulation. An insulated electrical conductor produced by this method comprises a core carrying an inner coating of heat resistant material and an outer coating of fused polymeric material.
    Type: Grant
    Filed: May 5, 1975
    Date of Patent: December 26, 1978
    Assignee: Northern Electric Company Limited
    Inventors: John A. Jukes, Philip A. McGettigan
  • Patent number: 4070588
    Abstract: A limiter circuit for the extracted timing signal in high speed digital repeaters is disclosed. The conventional emitter-coupled transistor pair limiter is modified by applying to the base of the output transistor the decoupled, attenuated, and delayed signal at the collector of the input transistor. The delay is such that the compensating signal at the base is out-of-phase with respect to the input signal by approximately -5/2.pi.. Experimental determination of delay and attenuation yields optimal phase and amplitude responses which are a significant improvement over those of the conventional limiter.
    Type: Grant
    Filed: November 10, 1975
    Date of Patent: January 24, 1978
    Assignee: Northern Electric Company Limited
    Inventor: Brian Richard Bryden
  • Patent number: 4069399
    Abstract: A TDM PCM communication system includes a plurality of user terminals, a switching network and a CPU for controlling the establishment of transmission paths between the user terminals and the switching network for the transfer of information between predetermined ones of the user terminals. An incoming path carries information bits from the user terminals to the switching network and an outgoing path carries information bits from the switching network to the user terminals. The switching network includes means for transferring single information bits each residing in a time slot period from the incoming path to the outgoing path. The transferring means includes an exchange means for effecting a bilateral exchange of information bits in fixed pairs of time slot periods, whereby paths for information bit transmission are periodically provided between ones of the user terminals, as determined by the CPU.
    Type: Grant
    Filed: November 17, 1975
    Date of Patent: January 17, 1978
    Assignee: Northern Electric Company, Limited
    Inventors: Bruce Robert Barrett, Alan Stanley John Chapman
  • Patent number: 4049925
    Abstract: In a telephone unit having a plurality of line selection pushbuttons, normally released on replacement of the handset, an additional release switch is provided with associated circuitry, whereby when a speaker unit or "hands free" unit is attached, pushbuttons can be actuated by a solenoid, even though the handset is not removed. The normal hold button is altered to a momentary button, and the solenoid releases all depressed pushbuttons. An additional circuit is provided for preventing actuation of the solenoid and release of an actuated pushbutton on cessation of a call when an answering service module is connected.
    Type: Grant
    Filed: December 8, 1975
    Date of Patent: September 20, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Graham Stirling Laing, Shiro Tom Ito
  • Patent number: 4031490
    Abstract: An analog signal processor in which the voltage is sensed across a plurality of charge storage elements to derive an output signal. With this arrangement, the effects of signal interaction encountered in charge sensing are eliminated. The processor can be readily implemented using MOS (metal-oxide-silicon) technology whereby the charge is manipulated by electronic data and stored at the surface of the semiconductor substrate. It is particularly adapted for use as a programmable cross-correlator or a transversal filter.
    Type: Grant
    Filed: January 29, 1976
    Date of Patent: June 21, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Miles Alexander Copeland
  • Patent number: 4031331
    Abstract: In an electronic telephone a speech network for connecting a transmitter and receiver to a line powered telephone line which utilizes a bridge configuration that is so arranged that the network will function on very low d-c line voltages, thereby enabling the set to be connected in multi-party applications with a conventional hybrid transformer set on long loop applications.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: June 21, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Mevhibe Gulay Sencer
  • Patent number: 4029916
    Abstract: A push button switch has a spring contact plate and a circuit board in superposed position. The spring contact plate has one or more switch positions, each switch position comprising a prestressed domed portion surrounded by a flat sheet portion. The domed portion includes a central portion and radial webs connecting the central portion to the flat sheet portion. Spring contacts extend radially from the central portion, each contact between a pair of webs. The domed portion is prestressed to assume a stable position offset upwards from a plane coincident with the flat sheet portion, and the webs each have an upwardly bent portion at the junction with the flat sheet portion. A push button acts on the central portion and pressure on the push button causes the central portion to snap through the plane of the flat sheet portion, with the spring contacts contacting contact areas on the circuit board. Release of the push button enables the domed portion to snap back to the stable position.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: June 14, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Pak-Jong Chu
  • Patent number: 4028501
    Abstract: A multiple frequency signalling receiver translates combinations of tone signals received from a telephone set to derive binary two out of eight coded signalling. Received signals are directed by a filter to high and low band translator circuits. Each translator circuit includes a circuit for deriving a threshold signal from the received signal and a threshold signal controlled limiter for limiting the received signal. The threshold signals are cross coupled between the limiter in each translator to prevent response to signals in the high and low bands being substantially unbalanced in amplitude. Digital counting and decoding circuits in each translator circuit detect predetermined frequencies of signals from the limiting circuits. Upon occurrence of a consistent detection by both the translator circuits lasting for at least about 40 milliseconds, the appropriate two out of eight code is gated to the output terminals of the multifrequency receiver.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: June 7, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Dennis Edwin Rittenhouse
  • Patent number: 4021652
    Abstract: An interface circuit adapted to selectively input serial and parallel PCM coded words and to selectively output serial and parallel PCM coded words is connected to a memory means. The memory means has a storage capacity for at least 2.sup.n memory words, each one having an address corresponding to a respective one of the PCM coded words appearing at the interface circuit and each one representing X db of signal level variation relative to its corresponding coded word. The output of the memory means is connected back to the parallel input of the interface circuit. A control means provides timing and control signals for loading the interface circuit with one of the coded words and for causing the memory means to be addressed at the location defined by the coded word. The control means includes means for circulating the coded word through the memory means a predetermined number of times M.
    Type: Grant
    Filed: December 11, 1975
    Date of Patent: May 3, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Ernst August Munter
  • Patent number: 4018995
    Abstract: A circuit for suppressing noise pulses generated by the transfer of a charged telephone line from one supervisory circuit to another is provided. A capacitor is first connected to the telephone line and is charged to the voltage level appearing across the telephone line at the one supervisory circuit. The telephone line is then transferred from the one supervisory circuit to the other supervisory circuit and the capacitor is disconnected from across the line.
    Type: Grant
    Filed: January 29, 1976
    Date of Patent: April 19, 1977
    Assignee: Northern Electric Company Limited
    Inventor: Harold Grant McClelland
  • Patent number: 4009340
    Abstract: A rectangular loading coil case has front, back, side and end panels, with cable entry and exit provided in one end panel, and with a support structure attached to, for example, the front panel and comprising rods extending across the case with a series of beams extending in opposed pairs and supported on the rods by spacer members positioned on the rods. Assembled magazines of loading coils are supported on the beams, each magazine supported at one end by one of a pair of beams and supported at the other end by the other of the pair of beams. A plurality of magazines are carried by each pair of beams, to form a layer. The number of layers can vary.
    Type: Grant
    Filed: September 22, 1975
    Date of Patent: February 22, 1977
    Assignee: Northern Electric Company Limited
    Inventors: George Debortoli, Peter McGivery Chase
  • Patent number: 4008447
    Abstract: A miniature electrical relay, particularly for telecommunications systems, has the armature releasably attached to the armature hinge spring by arranging for the armature and hinge spring to be of U formation, the ends of the legs of the armature and hinge overlapping, and with projections on one of the sets of legs engaging in recesses in the other set of legs. This avoids brazing or other more permanent ways of attachment and reduces fatigue fractures.
    Type: Grant
    Filed: November 14, 1975
    Date of Patent: February 15, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Joseph Anderson, Joseph Louis Lagasse, Satinder Singh, Victor Milalauskas
  • Patent number: D244380
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 17, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Richard Arthur Crump, John Scott Gibson, Allan Joseph Solar
  • Patent number: D244381
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 17, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Richard Arthur Crump, John Scott Gibson, Allan Joseph Solar
  • Patent number: D244454
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 24, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Richard Arthur Crump, John Scott Gibson, Allan Joseph Solar
  • Patent number: D244455
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 24, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Richard Arthur Crump, John Scott Gibson, Allan Joseph Solar
  • Patent number: D244456
    Type: Grant
    Filed: August 13, 1975
    Date of Patent: May 24, 1977
    Assignee: Northern Electric Company Limited
    Inventors: Richard Arthur Crump, John Scott Gibson, Allan Joseph Solar
  • Patent number: RE29371
    Abstract: A connecting block in which a support member has a large number of terminal clips extending through the member, for connection of wires to both ends, the support member pivotally mounted in a housing so that one or other side of the support member, and related ends of terminal clips, can be selectively presented for wiring. A hinged cover attached to the support member can be utilized to retain the support member in one selected position, the support member normally positioned in the other position, as by gravity.
    Type: Grant
    Filed: January 8, 1976
    Date of Patent: August 23, 1977
    Assignee: Northern Electric Company Limited
    Inventors: George De Bortoli, Helmut Hans Lukas