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| Number | Title | Issue Date |
| 5265263 | Handover techniques In a cellular radio system including a plurality of cells (e.g. cell sectors or micro cells) (4, 5, 8, 9, 10, 11) each normally using a respective channel for interference reduction purposes, a number of the cells are arranged in groups (6) and in the eve... | 11/23/1993 |
| 5228026 | Technique for time-division duplex cordless telecommunication A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station using alternating bursts of transmission over a single radio channel. Once a radio link has been s... | 07/13/1993 |
| 5220622 | Data base searching A holographic optical correlator includes a matched optical filter and control means therefor including a memory. In use searching for occurrences of an item to be found is carried out by the control means controlling the input and Fourier transform plane... | 06/15/1993 |
| 5208812 | Telecommunications system A communication procedure suitable for a cordless telephone system involves time division duplex radio communication between a handset 11 and a base station 3 using alternating bursts of transmission over a single radio channel. Once a radio link has been... | 05/04/1993 |
| 5201017 | Optical communications systems Soliton-type interaction is eliminated in optical fibre communications system by making the fibre appear to be a passive optical pipe to a signal to be transmitted along it. In particular, the signal to be transmitted is intensity modulated and at a first... | 04/06/1993 |
| 5161153 | Synchronous network A broadcast facility is provided in a synchronous network comprising a number of nodes (b 20l ) coupled via a star coupler (b 21l ). Data is transmitted via the network in a sequence of frames. Each node with a public write to send transmits it to all sys... | 11/03/1992 |
| 5160972 | Apparatus for controlling deployment of a cable A method of installing a cable, particularly but not exclusively in a duct filled with flowing liquid, wherein, as the cable is deployed, the strain in the cable is determined by sending a signal down the cable and receiving a signal back from the cable. ... | 11/03/1992 |
| 5161155 | Automatic telecommunications systems An automatic telephone system enabling subscribers access to more than one network (3,4). The subscriber's line (2) accesses the networks (3,4) via a highway providing at least two traffic channels (B) and one signalling channel (D). The signalling channe... | 11/03/1992 |
| 5159607 | RF signal synthesis Apparatus for synthesizing complex composite RF signals comprising a source of unmodulated RF carrier signal, means for splitting the RF carrier signal output of the source into equal components, separate modulating means to which respective carrier signa... | 10/27/1992 |
| 5124827 | Ferroelectric liquid crystal cells Relaxation effects of a uniform mode ferroelectric liquid crystal cell with obliquely evaporated alignment layers, characterized by the reduction in apparent tilt angle consequent upon removal of a switching stimulus, are eliminated by a poling treatment ... | 06/23/1992 |
| 5121644 | Deploying cables in pipelines Cable deployment in a fluid filled pipeline under pressure is monitored by use of a strain gauge device coupled between the leading end of the cable and a drogue. The strain gauge measures the pull of the drogue on the leading end of the cable and the str... | 06/16/1992 |
| 5115444 | Multichannel cavity laser A switchable multichannel external cavity injection laser incorporates a diffraction grating between a linear array of n reflectors and a common reflector to define a set of n optical cavities having different frequency bands. Each of the (n+1) reflectors... | 05/19/1992 |
| 5115207 | Automatic signal parameter control A fact acting automatic gain control system comprising a single or serial multistage arrangement. In one multistage embodiment (FIG. 1) each stage (13) has a first state with a predetermined gain and a second state with unity gain. The output of each stag... | 05/19/1992 |
| 5111324 | Optical receivers An optical receiver incorporating a voltage dependant impedance arranged to shunt excess AC photodetector signal away from the receiver amplifier in response to light level.... | 05/05/1992 |
| 5110224 | Flexible cable termination with swivel couplings A flexible termination between a submersible repeater housing and a submarine cable comprises a double ball link bar (20) and a cooperating socket (12) coupled to the repeater housing (1) and a similar socket (11) coupled to the cable. This enables a comp... | 05/05/1992 |
| 5105612 | Weld reinforcing member for strands in a cable A stranded wire strength member (2, 3) has a cable locking element (4) lying in the interstice between adjacent wires of the strength member. The locking element is of mild steel and has a surface coating (4a) of carbide grit which locks the adjacent wire... | 04/21/1992 |
| 5100260 | Cable burying equipment A cable burying device (3) comprises several heavy hollow tapered elements (7, 8) coupled to each other (7A, 7B, 8A, 8B) to provide limited flexibility, which is towed along the seabed and which digs a trench, the cable (1) passing through the length of t... | 03/31/1992 |
| 5090665 | Deploying cables A method of installing a cable, particularly but not exclusively in a duct filled with flowing liquid, wherein, as the cable is deployed, the strain in the cable is determined by sending a signal down the cable and receiving a signal back from the cable. ... | 02/25/1992 |
| 5083090 | Contactless measurement of the electrical resistance per unit length of filaments A non-contacting method of measuring the electrical resistance per unit length of a filament, such as a carbon-coated optical fibre, makes the filament the inner conductor of a co-axial transmission line and measures a propagation characteristic of that l... | 01/21/1992 |
| 5080505 | Optical transmission system In an optical fiber transmission system, signals are transmitted along a fiber optic path (11) in the form of substantially dispersion-free solitons. The transmission path includes a number of optical amplifiers (12) each of which determines, from the tra... | 01/14/1992 |
| 5062687 | Carbon coating of optical fibres An optical fiber is provided with a vitreous carbon coating by the pyrolysis of propadiene promoted by the retained heat of the fiber immediately after it has been drawn from preform.... | 11/05/1991 |
| 5056096 | Hybrid doped fiber-semiconductor amplifier ring laser source An hybrid laser source has a ring structure including the optical path in a semiconductor amplifier chip (1) and optical fibres (2, 3 and 4). The fibre (2) is rare-earth doped and provides an additional gain medium in the ring, the chip providing its own ... | 10/08/1991 |
| 5050295 | Multilayer through hole connections A method of providing a through-hole connection between conductive layers of a multilayer circuit board assembly whose thickness is liable to expansion and contraction is described. The method includes inserting into through-holes in adjacent boards a tub... | 09/24/1991 |
| 5048921 | Optical fibre cable joint A joint for an optical cable has a tapered hollow insert (26) with high friction surfaces (26D) so that after jointing the optical package, the cable strength members (6A 6B) can be clamped onto the high friction surfaces of the insert by a wedging action... | 09/17/1991 |
| 5037177 | Jointing optical fibre cables A joint assembly for an underwater optical fibre cable provides a limited-movement sliding clamp arrangement for the kingwire ends (9, 11). The sea casing provides the main tensile strength member of the joint and a split liner provides the main compressi... | 08/06/1991 |
| 5029981 | Diffraction grating A one-dimensional reflective-type diffraction grating is formed in a slab waveguide by a one-dimensional array of wells formed with substantially perpendicular walls.... | 07/09/1991 |
| 5028931 | Adaptive array processor An off-line processor arrangement for a broadband accelerated convergence adaptive antenna array wherein signals from a plurality of antenna elements are applied to respective identical tapped delay lines (T) the outputs of which are fed through individua... | 07/02/1991 |
| 5024503 | Hermetic gland for optical fibres An optical fibre gland for a submerged repeater comprising an insulating body (1) having a bore (4) accommodating a pressure tube (5). A high pressure end fitting (8) is secured to the tube and the body and a low pressure end fitting (12) is secured only ... | 06/18/1991 |
| 5018251 | Cable anchorage A cable anchorage for anchoring a submarine cable wire strength member comprises conically tapered parts (2,4,5), at least one of which has a surface (2C, 4B), roughened by tungsten carbine grit evenly distributed over and firmly bonded to the surface, pr... | 05/28/1991 |
| 5018834 | Addressing scheme for multiplexed ferro-electric liquid crystal A ferroelectric liquid crystal cell matrix address scheme that uses bipolar strobe pulses (20) to co-operate with bipolar data pulses (21,22) in a way that it can switch pixels into different states in a single refreshing not preceded by page blanking.... | 05/28/1991 |
| 4992654 | Optical logic device An optical logic device consists of a bistable liquid crystal layer (BOD 1) of the thermally-induced birefringent (TIB) type settable by one or more write beams and rfead by a beam of a different wavelength or different light polarization. Thus the read a... | 02/12/1991 |
| 4988374 | Method and apparatus for contaminant removal in manufacturing optical fibre An extrnal fibre drawing furnace is maintained at or close to its normal working temperature while contaminants are removed between fibre pulls. Either a removable insert, replaceable gas port assembly, or cleanable gas transfer duct, enable this to be ac... | 01/29/1991 |
| 4965216 | Method of fabricating a bi-CMOS device A process for fabricating a CMOS compatible bipolar transistor is described. The transistor, which is of the polysilicon emitter type, is fabricated by forming a p-type layer in a well, providing a polysilicon emitter in contact with the layer, using the ... | 10/23/1990 |
| 4957873 | Process for forming isolation trenches in silicon semiconductor bodies Isolation trenches are formed in a semiconductor, e.g. silicon, substrate by selectively doping the substrate and preferentially oxidizing the doped material. Typically the dopant is arsenic or phosphorus and preferably the substrate is doped to a level o... | 09/18/1990 |
| 4957340 | Synchronous multifrequency optical network A multi wavelength optical network including a plurality of wavelength multiplexed nodes each having a single frequency optical signal transmitting means (13) and a multi wavelength optical signal receiving means (15), an optical transmission network incl... | 09/18/1990 |
| 4955238 | Optical sensor An optical sensor uses a torsion-mounted thin silicon paddle (1) with magnetically soft material on its back. A light beam falls on the front face and part of the beam is reflected to a photo-diode (4) whose output drives a current in a magnetizing coil (... | 09/11/1990 |
| 4954865 | Integrated circuits An integrated circuit structure has a number of device areas each of which is configurable in a subsequent customizing process as a field effect transistor, a bipolar transistor or as a pair of those devices. Configuration of the structure is determined b... | 09/04/1990 |
| 4953939 | Optical fibre transmission systems A device for producing an optical delay in an optical signal having variable optical frequency, the optical delay varying with the optical frequency, comprises a chirped Bragg reflector formed in an optical fiber and a directional coupler for separating t... | 09/04/1990 |
| 4950045 | Single mode couplers A 1×N single mode optical waveguide coupler comprises a single input optical fibre (1), a slab-like mixer waveguide (3) and a plurality (N) of output optical fibres (2). As a result of interference effects light introduced into the mixer waveguide (3) vi... | 08/21/1990 |
| 4942766 | Transducer In a transducer, e.g. a pressure transducer, the sensing element comprises a torsional oscillator provided with magnetic means for feedback of signals to maintain oscillation. Typically the sensing element is formed by selective etching from a body of sin... | 07/24/1990 |
