baber/WOPTO huggingface dataset:
Patent GB-1419178-A (GB)
Title: Line-scanning circuit stage arrangement
IPC: H03K4/08
Filed: 1973-10-25
Abstract: 1419178 Cathode-ray tube circuits; television line time-base circuits LOEWE OPTA GmbH 25 Oct 1973 [28 Oct 1972] 49675/73 Headings H3T and H4T [Also in Division H2] In a television receiver employing a "thyristorized" horizontal deflection circuit including a fly-back thyristor 2 (Fig. 1), and a sweep thyristor 5, increase of the tube beam current (manifest by an increase in the voltage developed across a resistor 13 in the EHT circuit which voltage is integrated in a circuit 14) above a threshold level set in a switch 15 causes the latter to supply an "ignition" voltage to thyristor 2 for a time sufficient (by short circuiting the U B  supply) to cause a fuse (preferably a voltagedependent automatically resettable electronic fuse) to respond and interrupt the U B  supply. In a second embodiment (Fig. 2), positive half waves of the voltage developed across resistor 18 are integrated via resistor 21 and capacitor 22 and when this integrated voltage exceeds the voltage established by Zener diode 23 and the forward voltage of diode 24 transistor 26 (which normally supplies the switching (ignition) pulses via transistor 28 to thyristor 2) is held fully conductive. This results in transistor 28 being energized so that source U B1  supplies an ignition voltage to thyristor 2 for the time taken for capacitor 31 to completely recharge. Thyristor 2 therefore is held fully conducting and causes the fuse to respond and interrupt the U B  supply.
Patent GB-1081409-A (GB)
Title: Improvements relating to fuel cells
Inventor: WARSZAWSKI BERNARD
IPC: H01M8/00
Filed: 1964-12-07
Abstract: 1,081,409. Fuel cells. SOCIETE GENERALE DE CONSTRUCTIONS ELECTRIQUES ET MECANIQUES (ALSTHOM). Dec. 7, 1964, No. 49746/64. Heading H1B. A redox cell having an ion-exchange membrane 3 has thin, open electrodes 5, 6 vibrated against the face of the membranes.
Patent GB-500199-A (GB)
Abstract: 500,199. Purifying water; filters. CARRING, C. A. C. S. Aug. 3, 1937, Nos. 21380 and 21381. Convention dates, Aug. 11, 1936 and June.30,.1937. [Class 46] Plant for filtering and sterilizing water drawn from. a water-course, lake or well comprises a tank 1, sunk, wholly or in part, below the water-level of the source 2 and fitted with one or more filter-baskets 32. The water passes from the source 2 through pipes 4, 17, to which one or more vessels 9 containing - sterilizing agents are connected, is distributed in the tank 1 by a spreader 6 and after passing upward through the filter, is withdrawn by a pump, 14 through a pipe 13. A valve 5 at the end of the pipe 4 is operated by a float 25 according to the liquid level in the tank 1. The sterilizing agent is supplied from the vessel 9 through a valve 18 and a suction chamber 8 having a connection 19 to the atmosphere. The pipe 13 may be fitted with a non . return valve 22 which may be connected by linkwork with the valve 18, so that the valve 18 is closed when the pump stops. When the pump is driven by an electric motor, the valve 18 may he electromagnetically controlled. Alternatively the valve 18 may be controlled by a membrane actuated by suction in the pipe 13. There may be several filter baskets, superposed so that the. water passes through in series and packed with different filtering media. Quartz, quarts sand, zeolite, greensand, active carbon and marble arc mentioned as suitable media. Sterilizing agents may be mixed with the filtering media.
Patent GB-1196796-A (GB)
Title: Improvements in Electric Circuit Breakers.
IPC: H01H9/44
Filed: 1967-11-06
Abstract: 1,196,796. Arc extinguishing in electromagnetic switches. GENERAL ELECTRIC CO. 6 Nov., 1967 [7 Nov., 1966], No. 50247/67. Heading H1N. Two fixed contacts 14, 15 arranged to be bridged by a moving contact 30, are supplied through conductors 23, 24 which lie parallel to a line joining the fixed contacts and which are connected to the fixed contacts as shown so that the current flows in the same direction in the two conductors 23, 24 and in the opposite direction in an arc joining the two fixed contacts so that such an arc is driven away from the conductors on to arc runners 18, 19. The moving contact is U-shaped, the base of the U lying parallel to the conductors 23, 24 and on the opposite side thereof to the contacts 14, 15 so that upon overload the moving contact is driven to the open position by the electrodynamic repulsion. The contact 30 is coupled through an overcentre mechanism to a pivoted handle which is used to reset or open the contacts manually. The contacts are located in an insulating arc-chute whose inner walls are composed of an acetal resin material such as polyoxymethylene. In an alternative arrangement (Fig. 7, not shown) a straight bridging contact is used and the electrodynamic repulsion then serves to hold the contacts firmly closed.
Patent GB-1213520-A (GB)
Title: Process for the direct production of ketones from olefins
IPC: C07C45/34
Filed: 1968-10-24
Abstract: 1,213,520. Ketones from olefines. IDEMITSU PETROCHEMICAL CO. Ltd. 24 Oct., 1968 [25 April, 1968], No. 50562/68. Heading C2C. [Also in Divisions B1 and C5] Ketones are prepared directly from olefines by reaction in the vapour phase with steam and oxygen in the presence of a complex oxide catalyst comprising molybdenum oxide and cobalt, tin or iron oxide, the metal atom ratio of Mo to total metal being 0À005-0À5 and the temperature being 150-300 C. for Co or Fe catalysts, and 80-200 C. for Sn catalysts. The catalysts may be prepared by coprecipitating salts of the metals and baking or by baking mechanical mixtures of the oxides at 500 C. Carriers may be used. Examples prepare acetone from propylene and methylethylketone from butane-1. Reference has been directed by the Comptroller to Specification 990,639.
Patent GB-1145524-A (GB)
Title: Impedance matching networks
Inventor: RALPH FRANK
IPC: H01P3/00
Filed: 1966-11-11
Abstract: 1,145,524. Printed circuit impedance network. STANDARD TELEPHONES & CABLES Ltd. 11 Nov., 1966, No.50566/66. Heading H1R. A stripline network for simulating a non- loaded paired telephone cable of characteristic impedance Z o  is made by first simulating a cable impedance Z m  greater than Z o  by means of a stripline of length l, and then moving the position of the contacts on the stripline by a distance Kl where K is given by the formula K = 1/2 (1 - Z 0 <SP>2</SP>/Z m <SP>2</SP>). As shown, the invention is applied to a line similar to that described in Specification 1,122,873 and consisting of thin film strips 11, 11A of width b and resistivity Rs deposited upon dielectric layers 10, 10A. The line is wound into a roll together with a conductive shielding strip 14 the edge of which makes contact with a metal coating on one end of the roll. The line has an impedance between its ends Z m  = l/b #(2R s /j#C s ), where C s  is the specific capacitance between the thin films. In order to simulate an impedance Zo<Zm, the terminals 12, 12a and 13, 13a are moved inwardly by the distance Kl as stated above. The terminals need not be exactly opposite to each other but may be spaced equal and opposite distances from the nominal terminal points.
Patent GB-1235227-A (GB)
Title: Materials handling apparatus for treatment station e.g. for shell moulds
Inventor: TRENCH WILLIAM HUGO
IPC: B22C13/08
Filed: 1969-10-15
Abstract: 1,235,227. Dropping materials on to moulds; feeding material to endless conveyers. W. H. TRENCH. 15 Oct., 1969 [18 Oct., 1968], No. 50628/69. Headings B8A and B8S. [Also in Division B3] Apparatus for showering different materials over a mould and for recirculating excess material comprises compartments 3, 5 for the different materials which selectively discharge over a mould 11 the excess material falling into a hopper 13 having a pivotable discharge door 25 which deflects the material to the appropriate bucket conveyer 35, 37 which returns it to the appropriate compartment 3, 5 through a screen reciprocated by air cylinder units 48. The discharge devices for the compartments 3, 5 comprise constantly rotating shafts 59 within cylinders 55 having a square section, within the cylinders, provided with blades 60. The cylinders have inlets 57 and outlets 58 closable by gates 65 under spring action 77 and openable selectively by air cylinder units 75. Co-ordinating mechanism prevents contamination by ensuring that two outlets cannot be simultaneously open and that the door 25 ensures discharge to the correct conveyer 35, 37.
Patent GB-1080238-A (GB)
Title: Improvements in or relating to electro-acoustic transducers
IPC: H01L29/00
Filed: 1964-12-14
Abstract: 1,080,238. Microphone. SIEMENS A.G. Dec. 14, 1964 [Dec. 14, 1963], No. 50714/64. Heading H4J. [Also in Division E1] An electroacoustic transducer comprises a field effect transistor with source and drain electrodes connected by a conduction channel disposed adjacent a piezo-electric element. The current through the channel may control or be controlled by the voltage across the piezoelectric element so as to produce or respond to sound. Typically the transistor is based on intrinsic silicon with the conduction channel provided by an inversion layer under a surface oxide film. If the film is grown epitaxially it constitutes a piezo-electric element and is provided with an electrode. Otherwise a piezoelectric crystal e.g. of barium titanate or lead zirconate titanate is placed on top of it. The source and drain are constituted by alloyed zones. Use of suitably modified thin film transistors based on cadmium sulphide is also suggested.
Patent GB-1495292-A (GB)
Title: Acoustic transmission systems for electro-acoustic transducers
IPC: H04R25/00
Filed: 1974-11-25
Abstract: 1495292 Deaf aids; headsets INDUSTRIAL RESEARCH PRODUCTS Inc 25 Nov 1974 [20 Feb 1974] 50882/74 Heading H4J [Also in Division G2] In using an elongated tubular passage to couple acoustically between a sound opening and an electro-acoustic transducer, a uniform frequency response is obtained by providing an elongated tubular branch passage acoustically closed and damped and such as to exhibit at its junction with the main passage an impedance variation complementary to that of the main passage. This can be used with microphones or receivers and be applied in deaf aids or headsets. Fig. 10 shows the coupling of a deaf aid receiver and an ear cavity by way of a common receiver duct R and a main duct M; an auxiliary duct X closed by a plug and having damping D providing compensation for impedance variations attributable to the duct M as seen from the receiver. A behind-the-ear hearing aid (Fig. 4) has a mould housing 13 connected by a hook portion 17 through flexible tubing 19 to an ear mould 21. A receiver 15 is coupled by tubing 23 to a T-junction 25 and thence by duct 27 to the ear mould, a tube 31 with a folded extension plugged at 35 providing the compensating branch. Damping elements are placed in arms of the T-junction. Alternative ways of providing the coupling in behind-the-ear hearing aids are described with reference to Figs. 7 and 8, not shown. Fig. 6 shows a spectacles-type hearing aid in which the plugged compensating branch tube is provided in the temple piece 43, damping elements 28, 29 being provided in a connector 45. In Fig. 5 a microphone 4a is housed in a temple piece 5 1  of a spectacle, sound ducts 19A, 27A, 23A being formed when the two moulded halves of the temple piece are joined face-to-face; damping elements 28, 29 being incorporated.
Patent GB-1484618-A (GB)
Title: Making display devices
IPC: G02F1/1333
Filed: 1974-11-27
Abstract: 1484618 Controlling light PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 27 Nov 1974 [30 Nov 1973] 51389/74 Heading G2F  Each support plate of a liquid crystal display cell is provided with a layer of material which induces molecular alignment in the adjacent liquid crystal material, the layer being produced by disposing the plate in an atmosphere comprising an alkoxide, e.g. of Si, Ti, Al or B and an auxiliary gas, in the presence of an electric discharge. For homotropic orientation, a tetra-alkoxide is used, whereas trialkoxides, particularly if the plate is also grooved, provide parallel (homogeneous) orientation. The aligning layer appears to be a polymeric material, and the distance between the arode (support plate) and cathode should be at least 150mm to prevent oxide formation due to ion and electron bombardment. The auxiliary gas may be argon, nitrogen, oxygen or air. As particularly described, a metal oxide electrode layer and edge contact layers of Au and Ni are deposited on the plate by cathode sputtering, and are covered with photo-sensitive lacquer, which is exposed and etched. The edge contact layers are then etched chemically, and the electrode layer undergoes argon ion etching. The remaining portions of photo-sensitive lacquer are removed by oxygen ion bombardment which gives a clear surface for deposition of the aligning layer at reduced pressure. If grooved plates are required, either the plate or the oxide electrode layer may be grooved by a photo-resist and ion etching process. Grooves in the electrode layer should not extend entirely therethrough. The grooves preferably have a spacing and width of 1Á and a depth of up to 0À30Á, and provide an undulating profile rather than one which is stepped. In the assembled device, the groove direction and hence the molecular alignment direction on each plate may be the same or different.
Patent GB-1253394-A (GB)
Title: Capsule-bearing sheet material
IPC: B01J13/02
Filed: 1969-10-21
Abstract: 1,253,394. Microcapsules. NATIONAL CASH REGITER CO. 21 Oct 1969 [8 Nov., 1968], No. 51534/69. Heading B8C. [Also in Divisions B2, C3, C4 and D2] Compositions for colour-reactive copying papers (see Division D2) are described. In Example 1 pigskin gelatine, water and xylene are stirred together, aqueous solutions of gum arabic and of a copolymer of methyl vinyl ether and maleic anhydride and hot water are added,  and the pH adjusted. Acetic acid is added, the mixture cooled and glutaraldehyde added to harden the capsule agglomerates. A solution of urea and formaldehyde is added and allowed to polymerize on to the capsules. Another capsule emulsion is made by stirring together a mixture of chlorinated biphenyl and a hydrocarbon oil with two leuco dyes dissolved in it, gelatine and water, adjusting pH, adding an aqueous solution of a copolymer of methyl vinyl ether and maleic anhydride, gum arabic and hot water. The pH is adjusted, acetic acid is added, the mixture cooled and the capsules hardened with glutaraldehyde. Finally an aqueous solution of the copolymer is added. In Example 2, aqueous gum arabic and toluene are stirred together, and the emulsion added with water to a polyvinyl alcohol solution with stirring. The mixture is cooled and an aqueous solution of resorcinol and urea added dropwise, followed successively by aqueous sodium sulphate, aqueous formaldehyde, aqueous sulphuric acid and aqueous urea.
Patent GB-519069-A (GB)
Abstract: 519,069. Tetrazyl azide. DYNAMIT-AKT.- GES., VORM. A. NOBLE & CO., and FRIEDERICH, W. Sept. 7, 1938, No. 26132. .[Class 2 (iii)] Tetrazyl azide and salts thereof are prepared by a process which comprises reacting one molecule of cyanogen halide with two equivalents of alkali or alkaline earth metal azide or hydrazoic acid or one equivalent of hydrazoic acid and one equivalent of the metal azide. In examples : (1) Two mols. of sodium azide are mixed in aqueous solution with one mol. of cyanogen chloride or bromide, the product evaporated to dryness and extracted with acetone ; (2) barium azide and cyanogen bromide in the above proportions are mixed in alcoholic solution. Half of the alcohol is distilled off, and the barium chloride separates leaving a solution of barium tetrazyl azide ; (3) cyanogen bromide or chloride is added to an aqueous solution of hydrazoic acid containing sodium azide. The tetrazyl azide is isolated by evaporating to dryness and extracting with acetone ; (4) cyanogen bromide and sodium azide are heated in the above proportions in alcohol solution on the water bath. After the reaction half the alcohol is removed, which causes the sodium chloride to separate leaving a solution of sodium tetrazyl.
Patent GB-1530619-A (GB)
Title: Apparatus for developing offset printing plates
IPC: G03D13/04
Filed: 1975-12-19
Abstract: 1530619 Delivering sheets POLYCHROME CORP 19 Dec 1975 52024/75 Heading B8R [Also in Division G2] Printing plates are delivered from a developing tank by nip roller pairs 22A/22B and 24A/ 24B which are normally spaced apart to allow insertion of a plate up to end stop 164. Brushes 26A/26B are rotated faster than the rollers to scrub the plate as it is moved vertically out of the tank by the nip rollers. A hand operated cam plate is used to move the bearings of rollers 22A and 24A and brush 26A to engage and release the rollers and brushes for insertion of a plate. The drive to the rollers is activated after a time delay to control the dwell time of the plates in the developer. Guides 165 ensure that a plate enters the nip of rollers 24A/24B on removal from the tank.
Patent GB-1282436-A (GB)
Title: Bonding process
Inventor: MEYERS ROBERT ALLEN
IPC: C08L79/08
Filed: 1969-10-23
Abstract: 1282436 Bonding process TRW Inc 23 Oct 1969 52054/69 Heading B5N [Also in Division C3] A process for bonding adherends, e.g. rubber glass, metals, plastics and ceramics, comprises applying to the surfaces of the adherends a curable polyimide, obtained by reacting a polyamine, a poly-anhydride and maleic anhydride, and pressing the surfaces together at an elevated temperature. The polyanhydride is preferably a di-anhydride derived from a tetracarboxylic acid such as 3,3<SP>1</SP>,4,4<SP>1</SP>-benzophenone tetracarboxylic acid di-anhydride or 1,4,5,8-naphthalene tetracarboxylic acid di-anhydride. Suitable amines are 4,4<SP>1</SP>-methylene dianiline and 4,4<SP>1</SP>-oxydianiline. The polyimide prepolymer may be applied to the surfaces of the adherends in an organic liquid carrier or in the form of a hot melt. Alternatively a reinforcing material such as glass cloth is impregnated with the prepolymer and placed between the surfaces, and bonding is then effected by heat and pressure.
Patent GB-1308705-A (GB)
Title: Azo dyes process for their manufacture and use
IPC: C09B29/08
Filed: 1970-11-03
Abstract: 1308705 Azo dyes CIBA-GEIGY AG 3 Nov 1970 [3 Nov 1969] 52222/70 Heading C4P The invention comprises azo dyes, free from SO 3 H groups, of formula wherein D is the radical of a diazo component, A is p-phenylene which may be substituted, R 2  is an alkylene or alkylene-O-alkylene radical, X and X<SP>1</SP> are -O-, -S- or -NH-, Y is a cycloaliphatic radical, R 1  is alkyl which may be substituted and R 3  is an organic radical, and mixtures thereof. They are prepared by (a) azo coupling (b) condensing the compounds of formulae wherein R<SP>1</SP> 1  is an alkyl group or an -R 2 -X-H radical and Z is a halogen atom and (c) quaternizing the resultant products, if desired. The dyes may be used to colour leather, wool, silk and synthetic fibres, in particular polyacrylonitrile and polyester fibres in yellow, red and blue shades. Specification 1,308,706 is referred to.
Patent GB-1377962-A (GB)
Title: Starting control scheme for rectifier-inverter systems
IPC: H02M7/757
Filed: 1971-11-11
Abstract: 1377962 Starting converters GENERAL ELECTRIC CO 11 Nov 1971 [12 Nov 1970] 52388/71 Addition to 1279856 Heading H2F In a starting arrangement of the type described in Specification 1,279,856 (e.g. for starting a converter in a HVDC system), the gate pulses are initially supplied with a progressively increasing firing angle. As shown, the circuit of the Specification 1,279,856 is modified by an additional switching device 231 closed by a signal from the starting switch driver 45. When the switching device 231 is closed, capacitor 220 charges for a few milliseconds and the resulting voltage rise causes the firing angle to increase, e.g. from 20-60 degrees. The time constant of charging is preferably the same as the rate of rise of current in the HVDC link. A time delay 234 is included which is initiated either from the starting switch driver 45 or when the current in the HVDC link 7 has reached predetermined limits so as to disable the starting circuit after a period of approximately 8 milliseconds. The circuit is applicable to use with a 12-pulse converter formed by two 6-pulse bridges in series.
Patent GB-1456635-A (GB)
IPC: B02C13/284
Filed: 1972-11-14
Abstract: 1456635 Impact pulverizers SLAGMET AG 14 Nov 1973 [14 Nov 1972] 52575/72 Heading B2A [Also in Division C7] Metal contaminated with slag and impurities (e.g. waste from iron and steel furnaces) is fed into an impact mill having an inlet 2 and outlet 3, a rotor 4 being located between the inlet and outlet and having circumferentially spaced apart blow bars 5 and impact blades 7 pivotally secured to the casing 1 and arranged to shield the casing wall and located so as to comminute the contaminated metal in co-operation with the blow bars, the rotor rotating at a speed such as to comminute the contaminated metal into a metal fraction and a contaminant fraction which leave via outlet 3 and vibrating discharge table 16. The two fractions may be separated using an electromagnetic separator and the metal fraction screened into separate size fractions for recycling to iron and steel furnaces using a vibrating screen.
Patent GB-1529676-A (GB)
Title: Coffee making machines
IPC: A47J31/46
Filed: 1975-12-05
Abstract: 1529676 Coffee discharge W M STILL & SONS Ltd 5 Dec 1975 [5 Dec 1974] 52666/74 Heading A4E [Also in Division F2] In a coffee-making machine having a valvemember 12 moved relative to a seat 32 by a solenoid 22 to control flow from an infuser 2 to drain 10 via a passage 6, the solenoid is guarded from the coffee liquor flowing through the passage 6 by an upturned lip 26 and a table 18 fixed to the valve stem, which is in two parts 20, 16.
Patent GB-1522500-A (GB)
Title: Power steering control system for industrial trucks
IPC: B62D5/06
Filed: 1975-12-23
Abstract: 1522500 Power steering motor control TOYODA JIDO SHOKKI SEISAKUSHO KK 23 Dec 1975 [24 Dec 1974] 52682/75 Heading B7H A power steering control system, for an industrial truck having separate electric motors for hydraulic pumps of the steering and a lifting circuit, wherein the steering motor 20 is operable in response to depression of the accelerator pedal and switched off after a predetermined delay on pedal release. A vehicle battery is connected via a fuse 30 and a normally open relay 40 to the steering motor 20. Relay 40 is shunted by a key-operated switch 50 in series with an accelerator pedal controlled switch 60 and a coil 71 which forms part .of a time delay mechanism 70, the contacts of which are in parallel with switch 60 and coil 71. A further coil 42 is arranged in series with contacts 42. When the driver switches on and depresses the accelerator pedal switches 50, 60 are respectively closed and coil 71 is actuated causing immediate closure of contacts 72 to actuate coil 42. Energizing coil 42 causes closure of relay 40 and tho power steering becomes operable. When the accelerator pedal is released switch 60 opens de-energizing coil 71 and opening contacts 72, however, the time delay mechanism is such that contacts 72 are not opened immediately so that power steering is available for a time after the pedal release.