baber/WOPTO huggingface dataset:
Patent GB-1449600-A (GB)
Title: Methods and apparatus for speed control of induction motors
IPC: H02P27/06
Filed: 1972-12-15
Abstract: 1449600 Speed control of A.C. Induction motors NATIONAL RESEARCH DEVELOPMENT CORP 13 March 1974 [15 Dec 1972] 58005/72 Heading H2J  Method and apparatus for speed control of an A.C. induction motor, preferably a 3-phase squirrel-cage motor, comprises switching each half cycle of an A.C. supply for current flow to the motor during an interval starting at a controlled instant during the half cycle and extending to the next zero crossing of the waveform, and varying the intervals successively in duration substantially according to a similar function and controlling the running speed of the motor by ranging the frequency of the sinusoidal function. Alternatively, the intervals may commence at a controlled instant during one half cycle and extend during a number of successive half cycles. In a 3-phase system Fig. 6, (not shown), the motor has 3-phase windings, each phase winding comprising 3 winding sections. A triac or back-to-back thyristor pair is provided for current control in each winding section, each bi-directional device being controlled from a sine-wave generator arranged to moderate the input A.C. to provide firing pulses indicative of the starts of the intervals. Using a mathematical analysis it is explained how the nine triacs control the respective voltages of the associated winding sections according to nine modulation products given by the products of pairs of voltages Ac Be Cc Am Bm Cm, the first three being the voltages of a 3-phase, balanced, sine wave supply for the motor and the last three being the voltages of modulating envelopes relating a bias voltage amplitude R and a modulating voltage amplitude Q. Equations for the nine modulation products are given. The effect of the control is such that only one of the three frequencies contained in each winding section waveform sets up a rotating motor MMF. This frequency is controlled by the low frequency sine wave generator 4 of the modulator shown in Figure 1, which operates in a point-on-wave manner to control a triac 6 to pass variable portions of each half cycle of an A.C. supply 1, 2. The output of generator 4, as determined by variable frequency control 5, is applied to a transistor amplifier 11 which is combined with members 14, 15, 16 to form a relaxation oscillator. Typical operating waveforms are described, Fig. 2 (not shown). Alternatively a modulator operating in a burstfiring manner may be used, Fig. 3 (not shown), its triac (26) passing one or more complete half cycles of the A.C. supply to the modulator, Fig. 4 (not shown). By varying control 5, the motor speed can be varied from zero to synchronous value in either direction of rotation.
Patent GB-1330474-A (GB)
Title: Process for producing acrolein or methacrolein
IPC: C07B61/00
Filed: 1970-12-04
Abstract: 1330474 Acrolein; methacrolein UBE INDUSTRIES Ltd 4 Dec 1970 [12 June 1970] 58062/70 Heading C2C [Also in Division B1] Acrolein or methacrolein is prepared by contacting propylene or isobutylene in vapour phase with O 2  in the presence of a catalyst comprising (a) a bismuth antimonate and (b) at least one of Mn, Fe and Co molybdates.
Patent GB-1118179-A (GB)
Title: Improvements in or relating to circuit arrangements for processing pal colour television signals
IPC: H01J29/86
Filed: 1967-04-13
Abstract: 1,118,179. Transistor circuits; colour television. MULLARD Ltd. 13 April, 1967 [25 Aug., 1966],No. 58158/66. Addition to 1,111,170. Headings H3T and H4F. In a circuit of the kind described in Specification 1,111,170, for separating the chrominance signals of a PAL colour television signal, wherein one output of a transistor T is fed to a delay line DL producing anti-phase outputs across resistances Ri and R<SP>1</SP>i which are combined with a second output of the transistor to produce cancellation of unwanted signals at the two output terminals to and to<SP>1</SP>, a tuned circuit comprising L and C is provided for correcting any phase error. In Fig. 1 the input to the delay line is taken from a collector load Rc and the direct output from the transistor is taken from a second collector load R<SP>1</SP>a which is adjustable to allow for variations in attenuation in different delay lines. A variable emitter resistance Re varies the gain of the transistor and thereby adjusts colour saturation; this may be ganged with a contrast control Rk. The circuit LC is tuned to the colour sub-carrier frequency and has a Q factor such that d#/dW is constant and equal to that of the delay line; this allows a phase shift to be imposed on the direct output to compensate for errors in the delay of the delay line. In a modified circuit, (Figs. 2 and 4, not shown), the collector of the transistor is connected to the power supply, the delay line is fed from one emitter load resistance (Re), and the direct output is taken from a second parallel adjustable emitter load resistance (Ra) via respective resistances to the two output terminals, a point on the second load resistance being earthed through an LC circuit provided for phase correction.
Patent GB-1286508-A (GB)
Title: Screw thread cutting apparatus
IPC: B23G1/46
Filed: 1969-11-28
Abstract: 1286508 Screw-threading apparatus SVENSKA PRECISIONSVERKTYG AB 28 Nov 1969 [16 Dec 1968] 58375/69 Heading B3N In a screw thread cutting apparatus means is provided to prevent thread damage to a component during a screwing operation, e.g. upon reversal of a screw top in a blind hole-threading operation, the apparatus comprising a driving part 10, a driven part 52 between which are interposed torque-transmitting members 54, 56, 58 which permit axial displacement between the driving and driven parts. Springs 68, 70 are located between the parts and connected therewith by way of plug and sleeve members 72 and 92, respectively, a screw member 78 permitting the loading of the compression spring 68 without changing the relative positions of the driving and driven parts from their initial position. The compression spring 68 bears at its lower end against the plug 72 and at its upper end against the end of the sleeve member 92 which engages the driven part 52 by way of an annular lip 96. The tension spring 70 engages the plug 72 at its lower end and a transverse pin 104 at its upper end, the driving and driven parts thereby being retained in axial engagement. The drive from the driving member 10 to the driven member is effected through a dog clutch 20 and a spring 26 the loading of which is pre-set by adjustment of a lower sleeve member 36 relative to a body sleeve 40, the spring loading determining the operating torque supplied to the driven part 52.
Patent GB-1292634-A (GB)
Title: Improvements in and relating to arc welding guns
IPC: B23K9/12
Filed: 1969-12-01
Abstract: 1292634 Welding by fusion; angular bending BERNARD CO 1 Dec 1969 [24 April 1969] 58652/69 Headings B3E and B3R A consumable electrode arc welding gun includes a handle portion 10 having a through bore through which a main trunk 11 protrudes and is supported to permit circulation of cooling air within the handle portion, the main trunk having a wall of electrically conductive material, a rear fitting 21 for connection to a welding current cable, and a curved portion adjacent a head member 12 of the gun. As shown, the main trunk or gooseneck portion 11 is suspended from the handle portion 10 by collars 16. The gooseneck portion 11 has a tubular copper inner element 19 for conducting current to the contact tube of the head assembly 12, an intermediate element 29 of insulating and substantially ion-impervious material, e.g. glass filament cord or asbestos fibre, snugly encasing the element 19, and an outer element 30 of thin gauge metal snugly encasing element 29. The element 30 may comprise perforations 31 for the escape of ions. The collars 16 are clamped to the gooseneck portion 11 by set screws 35 and to the handle portion 10 by screws (40) (Fig. 2, not shown), entering threaded radial projections (37) of the collars. In a method of making the gooseneck portion 11 the assembly of three straight elements 19, 29 and 30 is bent to the required curvature using a forming die (48) (Fig. 3, not shown) the radius of which is slightly less than that desired to allow for spring back.
Patent GB-1201490-A (GB)
Title: Improvements in or relating to lamps and torches
Inventor: KING-YAN LAI
IPC: F21V13/00
Filed: 1967-12-29
Abstract: 1,201,490. Portable lamps. WORLD-LIGHT MANUFACTORY Ltd. 29 Dec., 1967, No. 59235/67. Heading F4R. A lamp, especially for use by motorists, consists of a housing 10 enclosing a lamp bulb (13) and reflector (12) and carrying a detachable element 21 which can be removed from the housing and engaged with a handle 16 so as to form a base for the lamp. The disc-shaped element 21 carries two diametrically opposite projections 22, each having an undercut notch 24, which may be inserted in holes in the back of the housing which are continued as slots so that the element can be turned to secure it in place. The end of the handle remote from the housing has a hole 28 into which one of the projections 22 may be inserted and moved laterally to engage the notch with the edge of the hole. The rear of the housing may have a metallic reflecting surface 11 and the element 21 may be made of a red plastics material and its surfaces appropriately grooved so that it functions as a rearwardly directed reflector. The bulb is powered by a cable from the battery of the vehicle.
Patent GB-1477840-A (GB)
Title: Acid-leachable iron-containing titaniferous material
IPC: C22B34/12
Filed: 1974-12-11
Abstract: 1477840 Upgrading iron-containing titaniferous ores LAPORTE INDUSTRIES Ltd 11 Dec 1974 [21 Dec 1973] 59302/73 Heading C1A and C1N Iron-containing titaniferous material suitable for acid leaching to reduce the iron content thereof is made by oxidizing an iron-containing titaniferous ore containing metallic Fe with CO 2 -containing gas to convert the metallic iron in the ore to Fe<SP>11</SP> and removing CO evolved during said oxidation to prevent reduction of Fe<SP>11</SP> back to metallic iron. The oxidation is suitably conducted in a stream of the oxidizing gas whereby CO evolved is removed from contact with the ore. Preferably the oxidation is conducted in a fluidized bed, the fluidizing gas comprising the oxidizing gas stream. The oxidation is suitably performed at temperatures of 700-900‹ C with contact times of 1/4-3 hours. The concentration of CO 2  in contact with the ore is preferably maintained at at least 30% by volume of the gas. The ore to be treated is suitably an ilmenite or concentrate which has been subjected to a pretreatment comprising an oxidation followed by a reduction. The content of metallic iron in the ore is preferaably less than 20% weight and the iron content is essentially in the metallic and ferrous states. The material is then suitably leached with hydrochloric acid or a solution of FeCl 2  in HCl and the upgraded ore resulting from the leaching shows a resistance to breakdown into fine particles under the conditions used in the fluidized bed chlorination to produce TiCl 4 .
Patent GB-1408459-A (GB)
Title: Apparatus for producing a beam of light moving parallel to itself
IPC: G01V8/18
Filed: 1972-12-22
Abstract: 1408459 Measuring dimensions photoelectrically E SICK [trading as ERWIN SICK OPTIK-ELEKTRONIK] 22 Dec 1972 [24 Dec 1971] 59381/72 Heading G1A [Also in Division G2] Apparatus for determining the size and position of an object comprises a scanning device 19, which moves a beam of light parallel to itself across a field containing the object 26, a beam-splitter mirror 20, a plane mirror 21 for returning light incident on the object 26 to the beam-splitter mirror 20, a photo-electric cell 23 arranged to  receive light from the beam-splitter mirror 20 which has passed from the scanning device 19 through the beam-splitter mirror 20 to the plane mirror 21 and back to the beam-splitter mirror 20, and a photoelectric cell 25 arranged to receive light through a grating 24 via the beam-splitter mirror 20 directly from the scanning device 19. Since the output pulse signal of cell 25 constitutes a scale, the size and position of the object 26 can be determined by comparing the output signals of the cells 23 and 25 in a logic circuit. The scanning device (see Division G2) comprises a fixed cylindrical concave mirror and a plane mirror moving on a circular path about the centre of curvature of the cylindrical mirror. A beam of light incident on the plane mirror is directed to the cylindrical mirror from which it is reflected along a path parallel to the original incident ray. As the plane mirror moves the output beam is displaced laterally while remaining parallel to the input beam. Two mirrors may be formed at the ends of a parallelogram section body which is continuously rotated or a single mirror may be mounted so that it reciprocates across the input beam.
Patent GB-1401885-A (GB)
Title: Magnetic storage medium
IPC: G11B5/702
Filed: 1972-12-22
Abstract: 1401885 Magnetic recording media AGFA GEVAERT AG 22 Dec 1972 [24 Dec 1971] 59468/72 Heading C3P Magnetic recording media comprise a support layer and a magnetizable layer which is free from non-magnetizable inorganic additives and contains a binder and a mono- or bi-nuclear aromatic compound containing at least two hydroxyl or amino groups as substituents in the same ring. Suitable such compounds include hydroquinone, 2,5 - di - tert - butyl hydroquinone, 4 - tert - butyl - pyrocatechol, guinhydrone, p - dimethylamino - phenol, gallic acid, pentahydroxyflavone, and mixtures thereof. In examples, magnetizable layers based on gamma-Fe 2 O 3  and containing one or more of the said compounds are deposited from solution on to a layer of polyethylene terephthalate. The binder in the magnetizable layer in the examples is a vinylidene chloride/acrylonitrile copolymer or a hydroxy-containing vinyl formal/dinyl acetate or vinyl chloride/vinyl acetate copolymer, and these layers also contain an organic ester of phosphoric acid as a dispersing agent, and either oleic acid, oleic acid triglyceride, butyl stearate or triethanolamine dioleate as a lubricant. Other supports &c. are mentioned.
Patent GB-1317227-A (GB)
Title: Developing silver halide colour photographic materials
IPC: G03C7/30
Filed: 1970-12-15
Abstract: 1317227 Triazolopyrimidines FUJI PHOTO FILM CO Ltd 15 Dec 1970 [16 Dec 1969] 59587/70 Heading C2C [Also in Division G2] 6 - Tertiary butyl - 1,3,3a,7 - tetraazaindene-4- thiol is prepared by heating 3-amino-1,2,4 triazole and 4,4-dimethyl-3-oxovaleric acid ethyl ester in glacial acetic acid to yield 4-hydroxy-6-tbutyl - 1,3,3a,7 - tetraazaindene which is then heated with phosphorus oxychloride to obtain the corresponding 4-chloro-compound which is treated with thiourea in ethanol to give the desired product.
Patent GB-1299092-A (GB)
Title: Improvements relating to controlled rectifiers
IPC: H02H7/127
Filed: 1969-12-17
Abstract: 1299092 Commutating controlled rectifiers COMPAGNIE GENERALE D'ELECTRONIQUE INDUSTRIELLE LEPAUTE 17 Dec 1969 [17 Dec 1968] 61534/69 Heading H2F [Also in Division H3] In a switching circuit using a controlled rectifier 1<SP>1</SP>, the rectifier 1<SP>1</SP> is turned on by the onset of each control pulse at 40 and turned off by means of a further controlled rectifier 2<SP>1</SP> responsive to the termination of the control pulse at 40 and has further means to operate the turnoff controlled rectifier 2<SP>1</SP> in the event of excess current through the main controlled rectifier 1<SP>1</SP>. As described, each control pulse at 40 is shaped in a trigger circuit 43 before being fed via an AND gate 44 to a further AND gate 42 where it gates a train of 50 kHz pulses from a multivibrator 41 to a transistor 61 the output of which is coupled via transformer 3<SP>1</SP> to the gate of the main thyristor 1<SP>1</SP>. The end of each pulse at 40 is differentiated at 12<SP>1</SP>, 13<SP>1</SP> and passed via a OR gate 45, transistor 14<SP>1</SP> and transformer 4<SP>1</SP> to the gate of a commutating thyristor 2<SP>1</SP> which is coupled via an oscillatory circuit to turn off the main thyristor 1<SP>1</SP>. The current of the main thyristor 1<SP>1</SP> is monitored at 46 and after amplification at 47, if the resulting signal is sufficiently large to break down Zener diode 22, a signal is provided by the output of transistors 23<SP>1</SP>, 25<SP>1</SP> which sets a monostable circuit 15<SP>1</SP> which results in turning on the commutating thyristor 2<SP>1</SP> (and hence turning off the main thyristor 1<SP>1</SP>) and inhibiting the triggering pulses to the main thyristor 1<SP>1</SP>. This action continues for a period determined by monostable circuit 15<SP>1</SP>. In Fig. 1 (not shown) the control signals are used to turn on a transistor which is coupled by means of a transformer to the gate of the main thyristor, the commutating thyristor being turned on by a further transistor in response to a voltage induced in a tertiary winding of the transformer. The resistor 46 is replaced by a current transformer.
Patent GB-2003491-A (GB)
Title: Coating compositions
IPC: C09D167/08
Filed: 1978-07-24
Abstract: An air-drying coating composition which provides a coating of patterned appearance and comprises two dissimilar oil-modified alkyd resins, moieties of conjugated drying oil and suitable metal driers.
Patent GB-2028174-A (GB)
Title: Glue applying device
IPC: B05C1/00
Filed: 1978-08-22
Abstract: Device for applying glue to a cut workpiece 12, 13 [Fig. 1] in a finger jointing machine includes circumferentially ridged glue applying rollers 23, 24 associated with axially extending doctor blades 33, 37 overlying and closely adjacent to the ridges of the glue applying rollers, glue supply conduits 43, 44 being provided at a location upstream, in the rotational sense of the rollers, of the doctor blades. A bead of glue is formed on the upstream side of each doctor blade and this is distributed evenly over the ridges of the glue applying roller, chippings and sawdust being held in the bead by the doctor blade so that they are prevented from entering into the grooves formed between the cut fingers. <IMAGE>
Patent GB-2007620-A (GB)
Title: Device for Collecting Loose Products Stored on the Ground
IPC: B65G65/22
Filed: 1978-09-01
Abstract: This device is characterised by the use of two symmetrical screws 9, 9a which are mounted co-axially in their mutual extension and are capable of moving along a gantry 4 at the same time as a central elevator 3, in the housing of which the products to be collected are discharged by the screws and which raises them up to a hopper for feeding them down onto a conveyor 6 running along the gantry 4 to feed a discharge conveyor 1. Application, in particular, to collecting beetroots stored in silos. <IMAGE>
Patent GB-2011423-A (GB)
Title: Coating Compositions Including Hydroxy Phosphate Catalyst
IPC: C08G59/40
Filed: 1978-12-21
Abstract: An improved thermosetting coating composition of the type comprising a film forming component and an amino compound, wherein the composition cures by reaction between the amino compound and hydroxy functionality present on the film forming material. The improvement comprises including in the composition a catalyst comprising at least one hydroxy functional organophosphate ester selected from certain mono- and diesters of phosphoric acid. The hydroxyl groups of the film forming material may be generated in situ by reacting a compound containing epoxy groups with the acid portion of the phosphate ester. Preferred coating compositions within the scope of the invention are fast curing, high solids coating compositions adapted for use as automotive topcoats.
Patent GB-2038880-A (GB)
Title: Reduction of Metal Oxide in Dispersed Electrical Discharge
IPC: C22B21/02
Filed: 1979-01-04
Abstract: The process comprises introducing the metal oxide in powder form and a reductant in a gaseous medium into a reaction zone of the reactor with a tangential component to create a vortex motion; maintaining a dispersed electrical discharge in the reaction zone, the gaseous medium in the reaction zone having a turbulence such as to keep the powder in suspension and to prevent the dispersed discharge from forming electrical arcs; maintaining a temperature in the reaction zone above a reduction-reaction temperature of said oxide; reducing said powder in the reaction zone to metal vapour; retaining said powder in the said reaction zone through centrifugal force until reduced; removing an effluent stream of gases including the metal vapour from said reaction zone; and converting the metal vapour to the liquid state. <IMAGE>
Patent GB-2044111-A (GB)
Title: Electrical game
IPC: A63F9/00
Filed: 1979-03-01
Abstract: An amusement device has a slot 23 in an electrode plate 22 along which an electrically conductive stylus can be moved whereby it can complete an electric circuit with a signal emitting device 16 on touching the walls of the slot. The slot is marked with figures to denote a player's progress. <IMAGE>
Patent GB-2016016-A (GB)
Title: Flame retardant polymeric materials
IPC: C08L23/08
Filed: 1979-03-07
Abstract: A flame retardant composition exhibiting enhanced properties comprises a polymer such as a vinyl acetate-ethylene copolymer, chlorinated polyethylene or other halogenated polymer, and hydrated alumina. No electrical conductor coated with such a polymeric composition is a particularly important application, e.g. in automotive wiring.
Patent GB-2046311-A (GB)
Title: Treatment of steel parts to increase their resistance to fatigue and other properties
IPC: C23F17/00
Filed: 1979-04-05
Abstract: This invention relates to a method of chemical and thermal treatment of steel parts such as gear wheels, shafts and sleeves for increasing their resistance to fatigue and wear and their hardness. The method is characterised by the following successively applied steps: phosphatizing, carbonizing, hardening and tempering. Steel parts treated according to this method will not develop a surface layer of low hardness and soft bainite patches during the carbonizing step, together with oxide occlusions mainly present along the grain boundaries and having a reduced content of alloying elements when compared with the alloying elements content of the base metal.
Patent GB-2049909-A (GB)
Title: Gaskets for heat exchanger devices
IPC: F28F3/10
Filed: 1979-05-01
Abstract: The invention relates to gaskets for heat exchanger devices. Gaskets of similar shape may often be used in heat-exchanger devices which have different operating pressures. It is important that the correct gasket is used. Lugs or upstanding protuberances, which do not contribute significantly to the sealing properties of the gasket, are provided on the gasket so as to identify the gasket. In the following example, castellations 16 formed in the outside walls 18 of the gasket grooves provide support for the gaskets as is known in the art. On a high pressure gasket 30, upstanding protuberances 17 on the gasket 30 cooperate with the gaps formed at the edge of the plates 15 by the castellations 16, this giving a clear indication that the gasket 30 is a high pressure gasket. <IMAGE>