Patents Assigned to Standard Telephones and Cables PLC
  • Patent number: 4812150
    Abstract: An optical fibre is provided with a coating by coating the fibre (1) with a coating material (4) on-line with the fibre drawing process (2) and employing a laser beam (6) to locally heat the coating material whereby to change its physical or chemical properties. Metallic glass coated fibres, useful for hermeticity and sensor applications, can thus be achieved in multikilometer lengths by fusing metallic glass forming alloy coatings to a fibre. Alternatively, polymer coatings may be cured by laser beam local heating.
    Type: Grant
    Filed: February 24, 1987
    Date of Patent: March 14, 1989
    Assignee: Standard Telephones and Cables, PLC
    Inventor: Michael G. Scott
  • Patent number: 4720684
    Abstract: Use is made of stimulated Raman emission to induce gain in an optical signal (13) of a first wavelength. The optical signal (13) and a pump signal (14) are synchronously coupled to a length of optical fibre (15). The pump signal is at a second wavelength. The first wavelength corresponds to one Stokes shift from the pump signal. The pump signal is generated by a semiconductor laser (11) and thus only relatively low pump powers are involved in comparison with the conventional use of YAG lasers as the pumps, however significant gain is achieved despite the low pump powers. Preferably the optical fibre (15) has a high Raman cross-section and a low transmission loss, for example GeO.sub.2 doped SiO.sub.2 or pure GeO.sub.2.
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: January 19, 1988
    Assignee: Standard Telephones and Cables plc
    Inventor: Kevin C. Byron
  • Patent number: 4717443
    Abstract: A mass transport process for use in the manufacture of semiconductor devices, particularly but not exclusively low threshold semiconductor lasers in the InP/InGaAsP system, involves the arrangement of a cover wafer (18) of the material to be grown adjacent to a semiconductor wafer (15) on which the material is to be grown, their disposition together with a crystalline alkali halide (20) in a crucible (16), and heating the crucible, which is almost but not completely sealed, in a hydrogen stream.For the manufacture of InP/InGaAsP lasers and the growth of InP, the alkali halide may comprise KI, RbI or CsI and a controlled amount of In metal (21) may be optionally contained in the crucible (16) to control the balance between growth of InP for defining the laser active region and erosion of InP from other areas of the wafer. Growth is achieved at temperatures comparable with liquid phase epitaxy processing temperatures.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: January 5, 1988
    Assignee: Standard Telephones and Cables, PLC
    Inventors: Peter D. Greene, Daniel S. O. Renner
  • Patent number: 4696543
    Abstract: Amorphous metallic material in ribbon form is employed to provide hermeticity of cable elements, particularly optical fibres. The metallic glass CuZr has a low permeability for hydrogen, particularly when erbium is included. Thus sealing optical fibres (1) in amorphous metal tubes (3) will prevent increase in attenuation of such fibres when used in submarine cables by preventing contact with hydrogen generated in such cables during use thereof.
    Type: Grant
    Filed: May 1, 1985
    Date of Patent: September 29, 1987
    Assignee: Standard Telephone and Cables, Plc
    Inventors: Gilles D. Pitt, Philip Extance, Roger E. Jones
  • Patent number: 4679250
    Abstract: An optical repeater for a submersible transmission system has a steel housing and a modular assembly carrying the electronic and opto-electronic components. Each module (20) of the assembly has heat conductive electrically insulating devices (30 to 33) secured to the periphery of the module (20) and embracing the inner surface of the housing (1). Each device comprises a resiliently biassed metal element (44).
    Type: Grant
    Filed: January 18, 1985
    Date of Patent: July 7, 1987
    Assignee: Standard Telephones and Cables plc
    Inventors: Aurthur A. Davis, Robert W. Eady
  • Patent number: 4653857
    Abstract: Optical four wave mixing is provided by interfering two waves on a liquid crystal layer (1) temperature stabilized just beneath its nematic/isotropic phase change transition temperature. The liquid crystal incorporates a guest dye to absorb the light producing a holographic thermal image which is accompanied by a holographic phase image. Illumination of this phase image with a `third wave` of different wavelength is then used to produce the required holographically diffracted `fourth wave`.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: March 31, 1987
    Assignee: Standard Telephones and Cables, PLC
    Inventors: William A. Crossland, Peter W. Ross, Neil Collings
  • Patent number: 4645749
    Abstract: Low concentration standard aqueous solution for analytical purposes is prepared from a water soluble glass body containing the standardizing material. The glasses are phosphorus pentoxide based glasses and provide release rates, e.g. of Na.sup.++, of 0.01 to 100 micrograms per cm.sup.2 per hour.
    Type: Grant
    Filed: June 26, 1985
    Date of Patent: February 24, 1987
    Assignee: Standard Telephones and Cables, PLC
    Inventor: Cyril F. Drake
  • Patent number: 4625211
    Abstract: A multiple output, power inversion adaptive antenna array comprises a number of antenna elements A1-An feeding a cascade beam former structure having groups of decorrelation stages D1.sub.1 -D1.sub.n-1, D2.sub.1 -D2.sub.n-2 etc. The outputs of the first stage in each group are scanned sequentially until the wanted signal is predominant, as determined by a wanted signal recognition CONTROL, at which time scanning of the switch S is halted.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: November 25, 1986
    Assignee: Standard Telephone and Cables plc
    Inventors: Jeffrey G. Searle, Christopher R. Ward
  • Patent number: 4618967
    Abstract: A radio receiver for frequency modulated signals in which direct conversion techniques are used to provide zero I.F. quadrature baseband signals I & Q. The I & Q signals are limited (11,12) to form square wave signals and pulse forming networks (13,14) derive pulse sequences the frequencies of which represent the polarity changes in the square wave signals. Each square wave is multiplied (15,16) by the pulse sequence derived from the other square wave to produce a unipolar pulse train. The two unipolar pulse trains are combined (17) to give a digital output signal the frequency of which is equal to the sum of the frequencies of the two pulse trains. Low pass filtering the output signal produces a simulation of the original baseband modulation.
    Type: Grant
    Filed: June 26, 1984
    Date of Patent: October 21, 1986
    Assignee: Standard Telephones and Cables, plc
    Inventors: Ian A. W. Vance, Michael W. Neale
  • Patent number: 4587267
    Abstract: A device for the controlled release of an active material into an aqueous medium comprises a porous sintered body of a water soluble glass (11). The pores of the body are filled with a composition (12) consisting wholly or partially of an active material. The device may be provided with a low solubility coating (13). On immersion in an aqueous medium the glass (11) dissolves to become a sponge-like structure having a plurality of convoluted capillaries and from which the active material is released.
    Type: Grant
    Filed: September 13, 1984
    Date of Patent: May 6, 1986
    Assignee: Standard Telephones and Cables, PLC
    Inventors: Cyril F. Drake, Alfred J. Arch
  • Patent number: 4583038
    Abstract: Insulation flaws in electrical components are detected by measurement of electrical leakage before and after immersion in a mobile ionizing solvent, e.g. a lower alkyl alcohol. A significant increase in leakage is indicative of a flaw, e.g. a crack in the insulation.
    Type: Grant
    Filed: March 1, 1983
    Date of Patent: April 15, 1986
    Assignee: Standard Telephones and Cables, PLC
    Inventor: Robert C. Chittick
  • Patent number: 4581733
    Abstract: In a small business-type telephone exchange, calls are set up in TDM manner using PCM to convey speech and data if the exchange serves any data terminals. The exchange has subscriber line ports (SLC) each serving two lines and a smaller number of trunk line ports (TLC) each serving a trunk to a local exchange. Each port has a local processor (SIP) with analogue-digital and digital to analogue conversion circuitry (CODEC-FILTER-TSAC). The exchange also has a central processor (CCP) with its associated memories (ROM, RAM, EAROM).The ports and the central processor are interconnected by an intelligence bus (PCM BUS) and a signalling bus (SIG BUS). The central processor (CCP) and the port processors (SIP) co-operate in call setting with all communications between the processors over the signalling bus. During operation the central processor (CCP) polls the ports via the signalling bus (SIG BUS) for ports needing the services of the central processor and also to pass call control information to those ports.
    Type: Grant
    Filed: October 3, 1983
    Date of Patent: April 8, 1986
    Assignee: Standard Telephones and Cables plc
    Inventors: Gary A. Sarson, David M. Davidson, John R. Bungard
  • Patent number: 4571738
    Abstract: A demodulator logic for FSK signals on an RF carrier in a direct conversion radio receiver, wherein the received signals are mixed with a local oscillator to provide quadrature baseband signals, characterized in that the demodulator logic comprises two clocked D-type flip-flops, FF1,FF2 one baseband signal being applied direct to the clock input CK of one flip-flop and inverted to the clock input CK of the other flip-flop, the second baseband signal being applied to the D inputs of both flip-flops, one input Q from one flip-flop being algebraically combined with one output Q from the other flip-flop to provide a demodulator signal output of the receiver, the two flip-flop outputs being chosen so that for a given FSK value they always have the same logic value.
    Type: Grant
    Filed: May 24, 1984
    Date of Patent: February 18, 1986
    Assignee: Standard Telephones and Cables plc
    Inventor: Ian A. W. Vance
  • Patent number: 4571662
    Abstract: Lead-less tantalum capacitors are made using a lead frame (1) formed to provide connection terminals (3,4) separated by an H-shaped aperture (7) and a bent-up anode support station (5). A two-part mould (13,13a) is used to injection mould plastics around the capacitor bodies prior to detaching the capacitors from the lead frame by severing necks (15,16,17,18).A second embodiment has flat connection terminals which are bent around the encapsulated body.
    Type: Grant
    Filed: June 8, 1984
    Date of Patent: February 18, 1986
    Assignee: Standard Telephones and Cables plc
    Inventors: Alexander R. Conquest, Christopher F. Powling
  • Patent number: 4563805
    Abstract: Polysilicon elements of integrated circuits, for example gates (24) or interconnects, are provided with metallic silicide layers (26) in order to take advantage of the lower resistivity thereof. The polysilicon elements are defined on an oxide layer (23) disposed on a silicon substrate (20) before polysilicon metallization. After polysilicon metallization the metal and polysilicon are caused to interdiffuse to form silicide layers (26) covering the polysilicon elements (24).
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: January 14, 1986
    Assignee: Standard Telephones and Cables, PLC
    Inventors: Peter D. Scovell, Paul J. Rosser, Gary J. Tomkins
  • Patent number: 4552433
    Abstract: A cabling machine for making single optical fibre cable with two layers of stranded armid yarn enclosed in a yarn outer wrap which employs a vertical axis for cabling and uses peripheral pay-off of the aramid yarn (34,39) from bobbins 33 mounted on a pair of separately driven turntables (21,22) and peripheral pay-off of the yarn wrap (45) from a spool (44).
    Type: Grant
    Filed: September 21, 1983
    Date of Patent: November 12, 1985
    Assignee: Standard Telephones and Cables, plc
    Inventors: James G. Titchmarsh, Peter G. Hale
  • Patent number: 4541088
    Abstract: In a digital PCM-TDM telephone exchange, supervisory tones needed are centrally generated by a digital synthesizer. This includes a PROM (1) in which PCM codes for the tones needed are stored in successive memory locations. The tones used are the DR tone, which is a mixture of 350 Hz and 440 Hz, and the BN tone, which is 400 Hz. These are read out under clock pulse control (5-6-7) such that the DR tone bytes are read out at time slot 0 and the BN tone bytes are read out at time slot 1. They are then sent over a common intelligence bus (4) to all line and trunk interfaces.At each such interface the tone bytes are converted to analogue form so as to be continuously available. The tone (or tones) to be used is (or are) selected in response to instructions from the central control each of which specifies a program in the interface's processor. Such a program controls both the selection of the tone (or tones) needed, and the cadence (continuous, or interrupted in a defined manner).
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: September 10, 1985
    Assignee: Standard Telephones and Cables, PLC
    Inventor: Gary A. Sarson
  • Patent number: 4536821
    Abstract: A dielectric composition, particularly suitable for the manufacture of ceramic capacitors, comprising lead magnesium niobate and lead zinc niobate. These may be additives, such as one or more oxide additives chosen from the group comprising silica, manganese dioxide, zinc oxide, nickel oxide, alumina, ceric oxide, lanthanum oxide and tungsten oxide, gallium oxide, titanium dioxide and lead oxide, or additives such as bismuth stannate. The compositions can be fired at temperatures between 980.degree. and 1075.degree. C. so that in the case of multilayer ceramic capacitors high silver content internal electrodes can be used. Higher dielectric constants, for example 9000 to 16,300, of the fired ceramics than conventional ceramics are obtained, thus permitting capacitor device size reduction.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: August 20, 1985
    Assignee: Standard Telephones and Cables, plc
    Inventors: Jennifer M. Wheeler, Dawn A. Jackson
  • Patent number: 4525767
    Abstract: A dielectric composition, for use in the manufacture of ceramic capacitors, and comprised of barium titanate (BaTiO.sub.3) with small additions of niobium pentoxide (Nb.sub.2 O.sub.5) and gadolinium sesquioxide (Gd.sub.2 O.sub.3).
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: June 25, 1985
    Assignee: Standard Telephones and Cables plc
    Inventor: John H. Alexander
  • Patent number: D292096
    Type: Grant
    Filed: February 28, 1985
    Date of Patent: September 29, 1987
    Assignee: Standard Telephones and Cables, Plc
    Inventor: Peter B. Carr