| Patent Number |
Title Of Patent |
Date Issued |
| RE34690 |
Display device having a reservoir and a vacuum channel for filling the display region with the l |
August 9, 1994 |
| A liquid crystal display cell comprises first and second substrates located in a substantially parallel relative arrangement to define an active display region therebetween when filled with liquid crystal material. The cell further includes means to effect filling of the active display r |
| D325646 |
Lighting fixture |
April 21, 1992 |
|
| D310511 |
Adapter for a track light |
September 11, 1990 |
|
| D306765 |
Lamp |
March 20, 1990 |
|
| D291368 |
Filter holder |
August 11, 1987 |
|
| 5764411 |
Apparatus for displaying an image |
June 9, 1998 |
| An imaging system for the generation of an apparent three-dimensional (3-D) image suspended in space for direct vieiwing includes a beamsplitter and a retroreflector. The optical property of reflecting light back along its original path enable the system to generate such an apparent 3-D |
| 5633947 |
Method and apparatus for fingerprint characterization and recognition using auto correlation pat |
May 27, 1997 |
| Apparatus for use with an autocorrelation technique for characterizing fingerprints includes an imaging device for providing an image of a fingerprint. The image so produced is then utilized by a microprocessor in order to generate an autocorrelation pattern for statistical comparison |
| 5619586 |
Method and apparatus for producing a directly viewable image of a fingerprint |
April 8, 1997 |
| A directly viewable fingerprint image is formed by illuminating a transparent planar substrate from one surface with collimated light, the substrate having pressed against the other surface a fingerprint to be imaged. Light striking the surface against which ridges of the fingerprint |
| 5459598 |
Optical modulation device with liquid crystal voids formed by the spacer arrangements |
October 17, 1995 |
| An optical modulation device includes first (1,4,6) and second (2,5,7) optically transmissive parallel plates having a ferroelectric liquid crystal material sandwiched between them. A plurality of spacer members (10), each secured to one of the plates, are located between the plates to |
| 5306912 |
Optically addressed thermal imaging device |
April 26, 1994 |
| A thermal imaging device includes detector pixels A, B, C provided by a pyroelectric layer 1 arranged between electrode structures 3 and 4. A photoconductive layer 7 is provided between the electrode structure 5 and a further electrode structure 9. The device also includes an illuminatio |
| 5260625 |
Color sequential illumination system |
November 9, 1993 |
| A color sequential illumination system, such as, for example, a backlighting system for a liquid crystal display (LCD), comprises lamps for emitting blue, red and green light. The red and green light is provided by lamps including fluorescent dyes having optical decay times similar t |
| 5245190 |
Imaging arrangement |
September 14, 1993 |
| An infrared imaging arrangement using a chopping device for periodically blocking exposure of an array of detector elements responsive to infrared energy by using a plurality of individually-mounted cells. There is a non-reciprocating rotary mechanism used for moving the cells substantia |
| 5233338 |
Display devices having color sequential illumination |
August 3, 1993 |
| A color sequential liquid crystal display, such as a television display, includes a lattice of selectably settable pixel elements which are time multiplexed addressed and illuminated during addressing to produce sequential red green and blue light outputs in any display period. The a |
| 5219712 |
Method of forming a solid article |
June 15, 1993 |
| In a method of forming a solid article of predetermined shape from a liquid which can be cured by exposure to radiation, a surface upon which the article is to be formed is provided. A predetermined region of the surface is exposed to a beam of radiation. Liquid is then supplied to an un |
| 5206145 |
Method of measuring the concentration of a substance in a sample solution |
April 27, 1993 |
| An apparatus is provided for measuring the concentration of a substance in a sample solution. The apparatus comprises first electrode means, second electrode means and an enzyme channel between the first and second electrode means. The enzyme channel contains an enzyme for catalyzing a |
| 5193911 |
Thermal detector device |
March 16, 1993 |
| A thermal imaging device comprising a pyroelectric layer having on one major surface an array of interconnected electrodes forming an entrance face, and on the opposite major surface an array of discrete electrodes connected to electrical circuitry formed on a semiconductive substrate. |
| 5193015 |
Cholesteric liquid crystal screen which reflects substantially all of the projected light |
March 9, 1993 |
| A screen for use in a front projection system includes a section capable of reflecting light of certain, predetermined wavelengths more than light of other wavelengths. The screen appears black or dark gray when viewed in broadband light. The screen provides for enhanced contrast between |
| 5189918 |
"Null" flow sensor |
March 2, 1993 |
| A flow sensing device includes a semiconductor substrate 31 and a pivoted beam 1. Below one half of the beam is a channel 7 running throughout the substrate 31, and below the other half of the beam is a cavity 8. During operation, a differential force exists across the beam, and the amou |
| 5189406 |
Display device |
February 23, 1993 |
| The display has a video signal receiver and a store with a capacity to hold one picture of the video signal. Row-output devices enable the video information for respective rows of pixels to be taken out from picture store, and each has a bit extractor to separate out one bit of the i |
| 5187330 |
Positional determination |
February 16, 1993 |
| A system for positional determination includes an array of piezoelectric sensor electrodes connected to an array of output lines via resistors for providing a binary code in response to activation of the sensor electrodes; and an array of further output lines also connected to the ar |
| 5184238 |
Apparatus for projecting light onto a surface having reflector means for improving the brightnes |
February 2, 1993 |
| A display device in the form of a slim screen projector has a beam-splitter and a reflector co-planar and in contact with each other. Incident light from a light source strikes the beam-splitter and reflector and a portion thereof is directed towards a mirror. Light from the mirror then |
| 5182490 |
Light sources |
January 26, 1993 |
| A fluorescent tube (2) is made of a plastics material containing at least one organic fluorescent dye and attached to the inner surface of this tube is a barrier layer (3) for absorbing ultraviolet radiation, and attached to the inner surface of the layer (3) there is a phosphor layer (3 |
| 5177341 |
Thick film electrically resistive tracks |
January 5, 1993 |
| In a thick film water track, irrespective of track thickness or the material of which the track is constructed, the optimum track width is found to be in the range of from 1.2 mm to 2.1 mm. Further, for a given resistance, the track is longer and may be conformed to a pattern to give |
| 5166501 |
Financial transaction cards having tagging element capable of deactivation by application of per |
November 24, 1992 |
| A financial transaction card 2, such as a check guarantee and/or credit card includes a tagging element 4 of a high permeability, low coercivity magnetic material, such as Ni Fe. The tagging element 4 is arranged in magnetic communication with a magnetic stripe 10 of relatively hard |
| 5162658 |
Thermal detection arrangement having a plurality of optical filter devices |
November 10, 1992 |
| A thermal detector arrangement includes a number of channels, each including a collimator for collimating incident radiation to a respective optical filter. Each optical filter has a respective radiation passband characteristic with one having a passband spanning the passbands of all of |
| 5157758 |
Tungsten halogen lamp |
October 20, 1992 |
| A tungsten halogen lamp producing infra red radiation, for example for cooking or heating, has an envelope of high silica content material sealed at each end by a pinch seal. A gas fill is at a room temperature pressure of 250-750 mm Hg. A portion of the envelope at each end is clear and |
| 5143438 |
Light sources |
September 1, 1992 |
| A luminaire is disclosed comprising a fluorescent plastics outer sleeve having a configuration such that a high proportion of the fluorescent light generated within the sleeve is emitted as visible light. The sleeve includes a fluorescent dye, which dye is excited by a blue phosphor |
| 5134344 |
Ballast circuits for gas discharge lamps |
July 28, 1992 |
| A ballast circuit includes a load circuit. A reservoir capacitor is effective to supply charge to the load circuit. A capacitive charge pump circuit is effective to transfer charge from a charge pump capacitive circuit to the load circuit and to the reservoir capacitor. The load circ |
| 5132678 |
Display device with time-multiplexed addressing of groups of rows of pixels |
July 21, 1992 |
| A method of operating a display comprising a lattice of pixel elements, includes the step of time-multiplex addressing collections of pixel elements. This addressing step includes using a first shift register means to designate operation of a second shift register means to select a f |
| 5130542 |
Thermal imaging devices |
July 14, 1992 |
| A thermal imaging device is described including an array of pyroelectric sensor elements. Each element is at least partially supported by a respective pillar of an intrinsic polymer material. The pillars provide an electrical path between the elements and a signal processing means. |
| 5128663 |
Display device incorporating separately operable pixels and method for operating same |
July 7, 1992 |
| A method of addressing a display device comprising a matrix of separately operable pixels is provided. The method comprises the step of applying across a given pixel a voltage waveform comprising a latching pulse and an auxiliary pulse of amplitude smaller than the latching pulse. The |
| 5124695 |
Display device |
June 23, 1992 |
| In a liquid crystal display, each pixel is formed of four separately energizable areas which have relative light outputs in the ratio 1:2:4:8 respectively, thereby allowing a range of 16 grey levels to be achieved by appropriate selection of areas. Each of the areas has a number of s |
| 5122944 |
Mounting arrangement for a lamp fitting |
June 16, 1992 |
| A mounting arrangement is provided for mounting a lamp fitting on a planar support, it comprises: a plurality of carrier means secured to the lamp fitting, each carrier means having at least one linear series of parallel tooth members; and a plurality of support members, each support mem |
| 5122791 |
Display device incorporating brightness control and a method of operating such a display |
June 16, 1992 |
| A display device is formed by a matrix of surface-stabilized bi-stable ferroelectric liquid crystal elements each being separately settable by a matrix driver. To provide brightness control or color in the display, all the elements of the matrix are set in accordance with a portion of a |
| 5117157 |
Ballast circuits for discharge lamps |
May 26, 1992 |
| A ballast circuit for the operation of a discharge lamp includes a bridge rectifier. A capacitive energy storage device and a load circuit are connected in series across the bridge rectifier. A charge circuit provides charge to the capacitive energy storage from the load circuit in a |
| 5113437 |
Signal identification system |
May 12, 1992 |
| A signal identification system, suitable for producing an identification code on a sound track recording is described. The system includes an encoder 209 effective to eliminate a variable sequence of frequency bands from an audio signal and insert a sequence of code signals into the |
| 5112361 |
Method of manufacturing color filters for liquid crystal cells |
May 12, 1992 |
| A method of manufacturing a color filter for a liquid crystal cell comprises forming a plurality of patterns, each of a respective dye intermediate material, on a carrier element. The patterns of dye intermediate materials are then brought into contact with a substrate layer, support |
| 5111319 |
Drive circuit for providing at least one of the output waveforms having at least four different |
May 5, 1992 |
| A drive circuit comprises a first waveform generator and a second waveform generator. Each waveform generator is capable of generating at least two voltage states and the instantaneous voltage of the first waveform is never less than that of the second waveform by more than a defined amo |
| 5111317 |
Method of driving a ferroelectric liquid crystal shutter having the application of a plurality o |
May 5, 1992 |
| A ferroelectric liquid crystal device has a first state (T.sub.X1) of maximum transmission, a second state (T.sub.X2) of minimum transmission and a value of voltage pulse width (t.sub.S) and voltage pulse height (V.sub.S) sufficient for a switching pulse to switch the cell from the f |
| 5111117 |
Discharge tube arrangement |
May 5, 1992 |
| An electrodeless discharge tube containing an ionizable fill, the tube having a first portion for insertion in a launcher and a further portion separated from the first portion by a partition wall. Hence a discharge can be excited in the further portion because a surface wave can propaga |
| 5099174 |
Arc tube for a discharge lamp |
March 24, 1992 |
| A sealing composition is provided for joining crystalline ceramic or cermet parts, e.g. in an arc tube for a discharge lamp. The sealing composition comprises, as starting materials, a mixture of alumina (Al.sub.2,O.sub.3), silica (SiO.sub.2) and magnesia (MgO), the mixture comprising in |
| 5097457 |
Optical recording system having a rotating optical element provided therein |
March 17, 1992 |
| A single channel optical recording system is described, which system does not require a second rotating optical element. The system uses focus error correction components located outside the rotating drum. Light transmitted to and from the drum is at all times axially symmetric, thus cir |
| 5093652 |
Display device |
March 3, 1992 |
| A display device has a lattice of pixel elements each selectably settable. A method of operating the display device comprises the steps of receiving a signal representing a picture for display during a display period and illuminating the lattice to produce, during a first interval within |
| 5086258 |
Discharge tube arrangement |
February 4, 1992 |
| An electrodeless discharge tube containing a fill which comprises a metal carbonyl complex. Such a complex will be sufficiently volatile to produce a vapor pressure in a discharge tube in which a discharge can be generated. The discharge so generated emits a mixture of visible and in |
| 5079648 |
Marked recorded signals |
January 7, 1992 |
| An apparatus for monitoring the marking of a recorded signal includes a data store containing marking information and a code selector for selecting any one of three orthogonal codes for marking the recorded signal and a demodulator for demodulating the marked signal and comparing thi |
| 5077474 |
Thermal imaging device |
December 31, 1991 |
| A thermal imaging device includes an array of pyroelectric detector elements, supported by an array of pillars, the pillars also being effective to enable the passage of electrical signals between the detector elements and an electrical signal processing means. Each pillar is separat |
| 5076203 |
Coating apparatus for thin plastics webs |
December 31, 1991 |
| Coating apparatus for a thin plastics web comprises a coating deposition station for applying a coating to the web by vapor deposition and a support for supporting the web at the coating deposition station. The apparatus includes a device for urging gas into the region where the thin |
| 5072157 |
Excitation device suitable for exciting surface waves in a discharge tube |
December 10, 1991 |
| A discharge tube arrangement comprises an excitation device and a discharge tube made of a light-transmissive dielectric material and containing a fill. The excitation device is suitable, when energized with radio frequency (r.f.) power, for exciting surface waves in the discharge tube. |
| 5070278 |
Discharge tube arrangement |
December 3, 1991 |
| A discharge tube arrangement includes a discharge tube containing a fill and means for generating a discharge in the fill from a source of radio frequency (r.f.) power. An electrically conductive structure surrounds the discharge tube. The electrically conductive structure is formed of a |
| 5065075 |
Launcher suitable for exciting surface waves in a discharge tube |
November 12, 1991 |
| A discharge tube arrangement for use as a light source includes a discharge tube made of a light-transmissive dielectric material and containing a fill. An excitation device for exciting surface waves in the discharge tube comprises an r.f. power generator and a launcher. The launcher is |
