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| Number | Title | Issue Date |
| 5285214 | Apparatus and method for driving a ferroelectric liquid crystal device In a method of driving a matrix of ferroelectric liquid crystal devices in a TDM mode, each strobing signal comprises first and second pulses (20,21) of opposite polarities and of different amplitudes, together with a dc voltage (26) which is applied from... | 02/08/1994 |
| 5278086 | Matrix addressable displays In a method of forming a matrix addressable display comprising a group of switchable cells, such as liquid crystal cells, having electrodes on each of two parallel plates and thin-film drive transistors disposed on one of the plates, gate resistors are pr... | 01/11/1994 |
| 5259987 | Liquid crystal materials Liquid crystal polymers, which may be used for optical information storage, either alone or in mixture with other liquid crystals, are of the general formula ##STR1## wherein the mesogenic grouping M has a general structure ##STR2## wherein... | 11/09/1993 |
| 5239483 | Detection of chemicals A device for detecting the presence of a chemical material, such as a gas, amongst a number of incident chemical materials comprises a group of sensors having overlapping broadband selectivities in respect of the incident materials, so that each sensor re... | 08/24/1993 |
| 5230096 | Radio receiver antenna arrangements A radio receiver antenna arrangement incorporating an RF pre-amplifier (5) wherein circuitry (11 to 21) is provided for by-passing the pre-amplifier when strong signals are picked up by the antenna (1) to avoid overloading the pre-amplifier.... | 07/20/1993 |
| 5225516 | Polymers The invention provides a polymer comprising a chain of detectable units joined together by linker arms. The detectable units may be, for example, antigenic or form part of a fluorescent or chemiluminescent or chromogenic or enzyme signal system. The polymer ma... | 07/06/1993 |
| 5216366 | Methods and apparatus for investigatitng the composition of material A method of determining the proportions of different components of material in a duct comprises exciting nuclear magnetic spins of nuclei of a species common to the components in a region of the duct and utilizing the resulting free induction decay (FID) ... | 06/01/1993 |
| 5204980 | Radio receiver systems A radio receiver system for receiving double sideband signals from a plurality of antennas (N1,N2) having different reception characteristics detects a reduction in power in one of the sidebands of a received signal, due to multiple path reception or othe... | 04/20/1993 |
| 5194133 | Sensor devices A sensor device for the analysis of a sample fluid comprises a substrate in a surface of which an elongate channel is micromachined. The channel contains a material, such as a starch, agarose, alginate, carrageenin or polyacrylic polymer gel, with a biolo... | 03/16/1993 |
| 5194860 | Radio telemetry systems with channel selection A radio telemetry system for collecting the readings of consumer's electricity consumption meters includes a master station (1) carried by a vehicle (1) and a plurality of transponders (3), each of which holds an electrical quantity indicative of an amoun... | 03/16/1993 |
| 5177495 | Radio receiver antenna systems A radio receiver antenna system including an antenna arrangement (1) which provides two signals (va, vb) respectively as are provided by two antennas having different reception characteristics, and circuitry (T1, T2, 35 to 47) for co... | 01/05/1993 |
| 5169737 | Deposition processes In a process for depositing a planarising material in spaces between a pattern of regions, such as dye stripes or dots, on a substrate, the planarising material is deposited as a layer over the pattern. The substrate is irradiated, from the reverse side, ... | 12/08/1992 |
| 5165057 | Radio receiver antenna systems resistant to multiple path propagation fading A radio receiver antenna system for overcoming multiple path propagation fading, includes an antenna arrangement which provides respectively at two terminals in response to a given transmitted signal, two signals at the frequency of the transmitted signal... | 11/17/1992 |
| 5163058 | Semiconductor laser pump source A laser source for pumping an optical device which requires for its operation a significant amount of light power, the source comprising a semiconductor array (11) for providing a plurality of spaced apart light beams at different wavelengths, an optical ... | 11/10/1992 |
| 5159280 | True logarithmic amplifier having a variable gain amplifier A true logarithmic amplifier including a gain controlled amplifier having an RF signal input and a gain control input and a successive detection logarithmic amplifier having an RF signal input and a video output connected to the gain control input.... | 10/27/1992 |
| 5156306 | Fluid dispenser A fluid dispenser for use, for example, in an ink jet printing head, comprises a switching device, preferably a bistable fluidic device, which switches fluid under pressure between a path in which the fluid circulates back to the fluid source and a second... | 10/20/1992 |
| 5147501 | Electronic devices In the production of micron-size pyramid emitters for field emission devices, a first layer of electrically-conductive material, such as single crystal silicon or metal, is etched to form column-like structures each of which tapers from each end of the co... | 09/15/1992 |
| 5143018 | Apparatus for depositing uniform films by how-pressure chemical vapor deposition An apparatus for depositing a thin film of amorphous or polycrystalline silicon on substrates by a low-pressure chemical vapor deposition process includes a high-speed pump device connected to one end of a vapor deposition chamber and operative to maintai... | 09/01/1992 |
| 5124664 | Field emission devices A klystron device comprises an array of cold-cathode field emission elements arranged to form a distributed amplifier which further comprises a modulation strip line and a catcher strip line. A collector electrode is spaced from the catcher strip line. Th... | 06/23/1992 |
| 5109287 | Information storage system Data stored on a remotely-located storage sheet (29,30,31) which may, for example, be a sheet of a spare-parts manual used in the motor trade, can be updated by transmitting a signal from a central station (20) to a receiver (21,22,23) at the remote locat... | 04/28/1992 |
| 5099195 | Electronic device for measuring electrical power supply to a load An electrical power measuring device wherein signals (Vi, Vv) representing one of the current and voltage supplied to a load are applied to the input of a sigma delta modulator (9), and the state (0 or 1) of the modulator output toge... | 03/24/1992 |
| 5081512 | Electronic devices Semiconductor apparatus comprises a split-gate semiconductor device (1) which has a first layer (3) of a first undoped semiconductor material (e.g. GaAs) and a second layer (4) of a second semiconductor material (e.g. AlGaAs) which is doped through at lea... | 01/14/1992 |
| 5073210 | Method of making electrical conductors A method of making material in the form of a fine wire or thin strip or sheet suitable for use as electrical conductors comprises: forming an ingot substantially consisting of an alloy of gold and one or more of the metals titanium, lutetium, zirconium, s... | 12/17/1991 |
| 5073219 | Method of and apparatus for making optical storage devices In a process for mass producing optical storage sheets, an elongate film of a liquid crystalline material is fed lengthwise along a path through an aligning gate. The aligning gate applies to successive areas of the film a field which aligns the molecules... | 12/17/1991 |
| 5063086 | Vacuum deposition process and apparatus for producing films having high uniformity In order to deposit films of materials, such as polysilicon or silicon dioxide, on major surfaces of substrates by a low-pressure chemical vapor deposition (LPCVD) process, gas, such as a silane gas, is admitted to a chamber at one end and is pumped throu... | 11/05/1991 |
| 5039206 | Liquid crystal displays In order to control the brightness of a fluorescent liquid crystal display, a photodiode is located adjacent an edge of a display cell. The photodiode receives light which has been totally internally reflected within the cell and which is thereby emitted ... | 08/13/1991 |
| 5026574 | Chemical vapor deposition process for depositing large-grain polysilicon films A deposition process includes the steps of heating a substrate, and passing silane gas over the substrate such that the heated substrate causes decomposition of the silane gas thereby to cause deposition of polysilicon film on the substrate. The temperatu... | 06/25/1991 |
| 5005952 | Polarization controller A polarization controller comprises at least one stack of nematic liquid crystal cells arranged such that radiation incident on the stack will pass through each cell in the stack in sequence. Synchronized electric or magnetic fields are applied across the... | 04/09/1991 |
| 5005128 | Automated vehicle control In a guidance system for guiding an automated vehicle around an area such as a warehouse, a scanning laser beam from a source mounted on the vehicle impinges upon reflectors located around the area. Each reflector incorporates an optical code which identi... | 04/02/1991 |
| 4996104 | Temperature-sensitive materials and devices A device for indicating whether a rise in temperature above a predetermined value has occurred includes a support member, such as a label, on which a temperature-sensitive material is deposited. The material includes a large number of fracturable microcap... | 02/26/1991 |
| 4994805 | Delta sigma modulator arrangements compensated by chopper stabilization A delta sigma modulator arrangement in which non-ideal characteristics such as noise or offsets in amplifiers or other circuits of the circuits of the arrangement are compensated by chopper stabilisation.... | 02/19/1991 |
| 4983878 | Field induced emission devices and method of forming same In a method of forming a field-induced emission device, a cathode is provided on a substrate, for example by etching away the substrate to leave a pointed projection. The projection may be covered with a metallic layer to enhance the field-induced cathode... | 01/08/1991 |
| 4980341 | Method of fabricating grain boundary Josephson junction A superconducting electronic device utilizes a weak link (Josephson junction) between two regions of superconductor material. A method of making such a device having a granular structure consists of taking a substrate with a predetermined grain size, and ... | 12/25/1990 |
| 4979113 | Automated vehicle control A vehicle guidance system includes a computer for generating signals to control a number of vehicles to carry out movements within a predetermined area. Data identifying locations of notional points on the floor of the area are entered into the computer t... | 12/18/1990 |
| 4973378 | Method of making electronic devices A field emission device which may be used, for example, as a surge arrester, comprises two electrode structures each comprising a substrate from which project tapered electrically-conductive emitter bodies. The structures are bonded together, face-to-face... | 11/27/1990 |
| 4972406 | Echo canceller An echo canceller (1) for full duplex digital data transmission in a transmitter/receiver unit when connected via a hybrid circuit (2) to one end of a two wire line (3). In order to provide adequate cancellation at a line data rate of 160 kbit/s over 7-8 ... | 11/20/1990 |
| 4972261 | Motion compensation image signal encoding system In a video signal coder/decoder arrangement or codec for an image transmission system motion of picture elements between frames is encoded with reference to any one of eight preceding frames, so that picture information which repeats within eight frames d... | 11/20/1990 |
| 4968382 | Electronic devices In the production of micron-size pyramid emitters for field emission devices, very sharp emitter points are achieved by providing a layer of suitable metal, metal compound or semiconductor, forming masking pads over the required emitter positions, etching... | 11/06/1990 |
| 4965832 | Active noise control An active noise control system for controlling noise propagated through a duct comprises a first microphone located to receive the propagated noise at a point in a plane perpendicular to the length of the duct. A loudspeaker is located substantially at th... | 10/23/1990 |
| 4963837 | Amplifiers A high current drive integrated circuit amplifier in which the quiescent currents in the output transistors are controlled by control current signals which are applied to respective input signal amplifiers and which are of values determined by currents fl... | 10/16/1990 |
