baber/WOPTO huggingface dataset:
Patent GB-872538-A (GB)
Title: Improvements in or relating to electric control systems
IPC: H02P5/52
Filed: 1957-10-09
Abstract: 872,538. Automatic tension-control systems. IGRANIC ELECTRIC CO. Ltd. Oct. 9, 1957 [Oct. 29, 1956], No. 31552/57. Class 38 (4). The tension in element 3, Fig. 1, in a processing line, is maintained constant by a booster generator BG, the armature of which is in series with the armature A2 of a motor M2 driving the rollers 2a, 2b, the field F4 of the booster generator being energized in accordance with a tension error signal obtained by the comparison of a voltage from a strain gauge LC and a reference voltage S. The excitation of fields F1, F2, F3 is fixed. The error signal developed by strain gauge bridges LC1, LC2, Fig. 3, and potentiometer 43 from an A.C. supply across transformer 31 is applied to a preamplifier 10, comprising triode stages 50, 51 and a cathode follower output stage 53, through a transformer 40, the primary of which is shunted by a filtering condenser Cl. The power amplifier comprising a push-pull stage 57, 58, and inverter stages 55, 56, feeds a phase-sensitive circuit 63 over a transformer 62 to energize control windings 67a, 67b of a self-saturating magnetic amplifier MA1 forming the first stage of a cascade pair MA1, MA2. Windings 69a, 69b provide a fixed bias. The booster field winding F4 is fed from output terminals 91, 92, of the second stage, through a resistor 94, which may be shortcircuited by a switch S2 to reduce the tension whilst a splice is passing through the controlled section. The A.C. supply to the strain bridges and the phase-sensitive circuit is voltageregulated. The alternative use of B.C. and choppers is also suggested.
Patent GB-1381829-A (GB)
Title: Ac tachometer generator
IPC: H02K7/00
Filed: 1973-07-03
Abstract: 1381829 Permanent magnet generators GENERAL ELECTRIC CO 3 July 1973 [3 July 1972] 31610/73 Heading H2A In an A.C. tachogenerator, a cylindrical cobalt samarium magnet 10 having its axis of magnetization lying along a diameter plane of the cylinder is directly mounted on a drive shaft 14 by a coupling assembly 13, and is rotated relative to a stator coil assembly 18, 19, 20 and housing 12 whereby to produce an output signal of fre-   quency proportional to the speed of the drive shaft, no formal bearing support for the rotor being required in the tachogenerator itself. In the arrangement shown, the magnet is stuck on to a nut shaped member 22 having an extension 23 with a threaded bore 25, and is supported on the shaft via a member 26 having a socketed end 29 for receiving extension 23, and two wedge elements 28 which just fit into a bore 33 of the drive shaft, the wedge elements being expanded by screwing the threaded end 32 of a member 27 into bore 25 to draw the tapered end 31 of member 27 progressively further into member 26, as seen in Fig. 2.
Patent GB-893259-A (GB)
Title: Paints
Inventor: MEJER GEORGE ALBERT DE
IPC: C09D131/04
Filed: 1959-09-16
Abstract: A combined rust remover and primer comprises at least 20% by weight of extremely divided (atomized) metallic lead in a nonoxidized condition with at least 15% by weight of phosphoric acid in a solution of a thermoplastic film-forming resin, e.g. poly-2-ethoxyethyl methacrylate or polyvinyl acetate.  The phosphoric acid may be used in its ortho, pyro or meta form.  A suitable solvent for the methacrylate resin is a 3:1 mixture of ethanol and isopropanol containing 3 to 5% of water, and for polyvinyl acetate is ethanol.  The methacrylate may have added thereto up to 20% of plasticizer ,e.g. trixylenyl phosphate or chlorinated diphenyl.  Also present in the composition may be bentonite, mica, alkyl ammonium montmorillonite and titanium dioxide.
Patent GB-267595-A (GB)
Title: Improvements in cases for cigarette packets and the like
IPC: A24F15/16
Filed: 1925-12-16
Abstract: 267,595. Norton & Gregory, Ltd., and Hickman, G. G. Dec. 16. 1925. Fittings, internal; contents, facilitating access to.-A case for a tray and shell packet of cigarettes &c. comprises an outside casing A, Fig. 1, with a closing flap L and an inner frame, Fig. 2, consisting of two sides C and a bottom B, the latter carrying a spring D which engages the bottom of the tray when the packet is placed in the case and the sides C having means for preventing the shell from being pushed out of the casing. When the flap L is released the spring, which is shown of double-elliptic form with a plate E engaging the bottom of the tray K, pushes the tray out of the shell and case and renders the cigarettes easily accessible. The frame has points F, H to engage the shell of the packet and the points H may be carried bv a spring tongue G to compensate for variations in the sizes of the packets.
Patent GB-1170822-A (GB)
Title: Method and Apparatus for Regenerating Pulses
IPC: H04L25/49
Filed: 1967-07-11
Abstract: 1,170,822. Digital transmission systems. SOC. ANON. DE TELECOMMUNICATIONS. 11 July, 1967 [7 April, 1967], No. 31788/67. Heading H4P. A regenerator for three-level binary signals b, Fig. 5, in which 0 bits are represented by zero polarity and 1 bits by positive or negative polarity, comprises means for deriving timing pulses g from the received signals b and for deriving control signals j, k by addition and subtraction of the pulses to be regenerated and the timing pulses, the pulses being regenerated in accordance with one or other of the control signals j, k in dependance on the polarity of the pulse to be regenerated when the control signal exceeds a certain threshold S. The circuit described, Fig. 4 (not shown), employs matched hybrid transformers. The received signals b are limited and split by diodes to signals c and d which represent the positive and negative maxima. These signals pass to a first hybrid which develops their sum f and difference e. The sum signal feeds a second hybrid, and from the difference signal a known circuit develops bit-rate clock signals g which pass to a third hybrid which produces clock signals g, h. Signals g are fed to the second hybrid which produces sum and difference signals j(=g+f) and k(=g-f). The latter feed two bi-stable circuits which are respectively triggered to the 1 state whenever signal j or k exceeds threshold S and are reset to the 0 state whenever a clock i occurs. Pulses i are derived from pulses h by way of a half-bit delay and a fourth hybrid. The outputs l, m of the bi-stables feed a fifth hybrid which develops the difference signal o, which represents the received data in unipolar return-tozero form, and the sum signal n, which represents the data also in RZ form but retains the original polarity states of the 1 bits.
Patent GB-1115329-A (GB)
Title: Dibenzocycloheptene derivatives
Inventor: ENGELHARDT EDWARD LOUIS
IPC: A61K31/135
Filed: 1965-12-21
Abstract: Novel compounds of the formulae <FORM:1115329/C2/1> wherein X represents a hydrogen or halogen atom or a C1- 5 alkyl, trifluoromethyl, C1- 5 alkoxy, C1- 5 alkylsulphonyl, C1- 5 alkylmercapto or di(C1- 4 alkyl)sulphamoyl radical are prepared by formylating the corresponding N-unsubstituted aminomethyl derivatives.
Patent GB-1349318-A (GB)
Title: Bottled water cradle case construction
IPC: B65D85/30
Filed: 1972-07-06
Abstract: 1349318 Cases C E FRAM and S E FRAHM 6 July 1972 [6 July 1971 12 Oct 1971] 31809/72 Heading B8P A moulded plastics bottle holder has four sides 11-14 integral with a bottom 15 and four webs 32, 21, 41, 54 extending across the corners of the holder, resilient inserts 55 in the sides for gripping a bottle, projections 60, 61 at the top of the sides 11 and 13 to aid the holding of the bottle, and projections 11F, 13F, on the sides 11 and 13 adapted to nest in projections 11G, 13G on a like holder to facilitate stacking, the bottom 15 comprising a central disc 15D connected by radial ribs 15C to a ring 15A integral with the sides and the corner webs. The inserts 55 having recesses 55A are held in a lattice portion of the sides. Hand holes 11D-14D are also formed in the sides.
Patent GB-644402-A (GB)
Title: Electronic valve amplifiers or oscillators
Inventor: SCHREUER WALTER
IPC: H05B6/04
Filed: 1947-12-02
Abstract: 644,402. Valve circuits. COMMUNICATIONS PATENTS, Ltd. Dec. 2, 1947, No. 31858. [Class 40 (vi)] In an oscillator or amplifier operating with grid current, the grid current is maintained constant by using the anode-cathode path of a tetrode or like constant-current device as grid leak. The grid-cathode path of an oscillator V1 comprises a choke 13 and resistance 12 and the anode-cathode path of a tetrode V2. The screen of the valve V2 is connected over a current-limiting resistance 14 to a source of potential which is fixed relative to that of the cathode, and which may comprise a resistance and gas-discharge tube in series between anode and cathode. The grid of the valve V2 is connected to cathode; alternatively the grid potential may be made variable in order to control the current through the valve. A resistance 16 connected in parallel with the valve V2 prevents instability due to secondary emission irregularities.
Patent GB-162335-A (GB)
Title: Improvements in or appertaining to devices for regulating or moving parts of change speed gears or for similar operations
IPC: F16H63/34
Filed: 1919-12-19
Abstract: 162,335. Caton, C. H. Dec. 19, 1919. Variable-speed gearing.-Bars a, b, Figs. 1 and 6, which are moved selectively to shaft clutch and gear members are provided with oppositelydisposed, spring-actuated, pointed plungers or toggles, to complete the movement and hold the bars locked in the final positions. The bars a, b are each in two parts connected by gudgeons a<1>, b', which are forced across the space between two pointed plungers h<1>, h<2>. These plungers slide in fixed sockets and are thrust outwards by springs m. When the gudgeons have passed the points of the plungers, their movement is assisted by the return of the plungers. Instead of the plungers, a pair of toggle links p, p<1>, Fig. 4, may be used acted on by springs p<4>. Spring-actuated forks releasable by hand may lock the toggles in their extreme positions. Specification 162,336 is referred to.
Patent GB-1479301-A (GB)
Title: Motion picture projector
IPC: G03B19/18
Filed: 1974-07-18
Abstract: 1479301 Projector film drive EASTMAN KODAK CO 18 July 1974 [25 July 1973] 31868/74 Heading G2E [Also in Division B8]  In the film drive control mechanism as described and shown in Specifications 1479302 and 1479303 the lever 30, which can be set at various locations as indicated by a face plate (28) Figs. 1 and 2 (not shown), so as to condition the projector to operate in various corresponding modes, also controls various other functions of the projector. Immediately behind this face plate is a co-ordinating plate 108 pivoted on a fixed pin 110, and having an opening 112 which corresponds very roughly to the opening in the face plate. Lever 30 is pivoted so as to allow both sideways and up-and-down movement. When it is moved to various modesetting locations in the face plate it moves correspondingly in opening 112. One end of plate 108 has a recess 113 in which a pin 136 fixed to a vertical slide bar 130 engages. Thus pivotal movement of plate 108 raises or lowers the slide bar. Consequently when lever 30 is moved to the "off" mode, plate 108 is pivoted clockwise, and the lever also depresses the plunger 114 of a normally closed switch 116, which opens to switch off the projector and the film drive means. Clockwise movement of plate 108 also moves slide bar 130 downwards, which causes the movable part 144 of a gate 140 to move away from the fixed part 142, so allowing threading, or free movement of the film in the "rewind" or "fast forward" mode. When lever 30 is set to the "project" position Fig. 7, plate 108 is pivoted anti-clockwise, which closes a switch 120 to energize the projection lamp. At the same time, bar 130 is pushed upwards, which moves gate part 144 against gate part 142, so that the film F is located firmly between them in the projection plane. Plate 108 and slide 130 may be operatively coupled to control other features such as a sound transducer, a loop sensor, or a filter.
Patent GB-1475069-A (GB)
Title: Manufacturing a foundry mould or core
IPC: B22C23/02
Filed: 1974-09-03
Abstract: 1475069 Moulding foundry moulds and cores WEST OF ENGLAND SECURITIES Ltd 3 Sept 1974 [5 July 1973] 32017/73 Heading B3G A method of producing a foundry mould or core comprises electrostatically depositing a particulate material comprising ceramic powder on to a pattern or core box, aggregating the layer thus formed, and removing the mould or core from the pattern or core box. The particulate material may include epoxy resin as a bonding agent, in which case the deposited layer is aggregated by infra-red heating, or a bonding agent which is hardened by exposure to carbon dioxide gas may be used. Fig. 2 shows an apparatus for the continuous production of moulds such as that shown in Fig. 1. Patterns 1 are fed to a rotatable disc 2 at a loading station 3, indexed to a first deposition station 4 where a first layer 13, of ceramic powder and epoxy resin, is electrostatically sprayed on to the pattern, indexed to a curing station 5 having infra-red heaters 14 where the epoxy resin is hardened, through further spraying and curing stations 6, 7, 8, 9 where the layers 15, 16 are formed, and on to a filling and packing station 10 where a box 17 is positioned around the pattern and filled with a backing 18 of coarse refractory. The layers 15, 16 comprise a coarser ceramic material than the first layer 13. At an unloading station 11, the pattern and mould are removed. If the pattern is fixed to the disc, loading station 3 is omitted and an additional station provided for coating the pattern with mould release after removal of the mould at 11. In Fig. 3 (not shown), a core is produced by depositing particulate material from an electrostatic spray gun into a split core box. In this case, the most convenient method of aggregating the deposited layer is by use of a CO 2 - hardenable bonding agent, CO 2  being passed into the core through a pipe. The continuous apparatus described above may be used in conjunction with core boxes.
Patent GB-921275-A (GB)
Title: A switching stage for use in connection with an electronic selection control circuit
IPC: H03K17/74
Filed: 1960-09-19
Abstract: 921,275. Automatic exchange systems. SIEMENS & HALSKE A. G. Sept. 19, 1960 [Sept. 17, 1959], No. 32183/60. Addition to 888,196. Class 40 (4). In a switching stage of a hunting or allotting circuit of the type described in the parent Specification, the coupling input, to which release or blocking potential is supplied from the preceding stage, is connected to the coupling output, from which similar potentials are supplied to the succeeding stage, by way of a transistor which forms part of an amplifier. If the equipment associated with the stage shown is free negative free potential is applied to the testing input p, so that if the positive release potential is supplied to the coupling input k1 from the preceding stage the transistor T1 conducts and its positive collector potential appears as marking potential at the marking output z. The release potential also cuts off T3, and the marking potential extended to the junction of resistors R1 and R6 cuts off T2. The absence of a defined potential at the coupling output k2 constitutes the blocking potential condition thereat. If the equipment associated with the stage shown is busy, the positive busy potential at p cuts off T1, so that the negative U1 potential appears as neutral potential at z, and also causes T2 to conduct. The positive collector potential of T2 thus appears at k2 as release potential. This potential is derived from U3 and not from the preceding switching stage and is thus the same for each stage.
Patent GB-1473756-A (GB)
Title: Cylinder sleeve for a reciprocating piston combustion engine
IPC: F02F1/16
Filed: 1975-08-01
Abstract: 1473756 Combustion engine cylinders MAHLE GmbH 1 Aug 1975 [13 Aug 1974] 32228/75 Heading F1B A cylinder for a reciprocating piston combustion engine to be cooled by liquid has diametricallyopposed portions of its wall of greater thickness than the remainder of the wall. The thickened portions are those subject to greatest stress during reciprocation of a piston in the cylinder and may extend over opposed regions each extending about 60 or 120 degrees of the cylinder periphery.
Patent GB-848449-A (GB)
Title: Improvements in or relating to circuit arrangements including electric discharge tubes
IPC: H03G1/00
Filed: 1956-10-23
Abstract: 848,449. Valve amplifying circuits. SIEMENS & HALSKE A. G. Oct. 23, 1956 [Oct. 25, 1955], No. 32312/56. Class 40(6). [Also in Group XL(a)] A circuit arrangement, Fig. 1, includes a discharge tube 4 having at least two control electrodes 1 and 2 wherein a variable control voltage, through the resistor 8, a signal voltage, through a capacitor 9, are applied to the electrode 1, and wherein a voltage positive with respect to the cathode 3 is applied to the or each other electrode 2 through the resistors 5 and 6, the resistors 5 and 6 being bridged by the capacitor 7 so that the potential of the or each other electrode 2 varies in dependence on the control voltage and the signal voltage. The positive voltage applied through the resistors 5 and 6 can be variable. The impedance of the capacitor 7 at the signal frequency is low compared with the value of the resistor 6 so that variations in potential of the electrode 2 due to the signal depend substantially solely on the magnitude of resistor 5. The resistors 5 and 6 can be replaced by a single resistor and the capacitor 7 omitted. The electrode 1 can consist of a helical winding of variable pitch, and the electrode 2 can surround only a portion of the length of the electrode 1. In the arrangement shown in Fig. 3 a screen grid is connected to the junction of the resistors 5 and 6, the potential of the screen grid varying with the control voltage. Separate impedance arrangements can be provided for the or each electrode 2 and the screen grid. In an alternative arrangement the resistor 6 and capacitor 7, are replaced by a filter circuit which may be a resonant circuit having a high impedance at one particular frequency or over a band of frequencies so that the voltage variation on the electrode 2 is large for this frequency or band of frequencies. The filter circuit consists of combinations of inductors, capacitors and/or resistors, and two or more of the inductors can be coupled by their mutual inductance and elements, the impedance of which is variable in dependence on a control voltage, can be included. A voltage varying with the voltage on the electrode 2 may be applied through an impedance arrangement to at least one low-potential electrode which can be one that normally is at cathode potential or at negative potential with respect to the cathode.
Patent GB-338321-A (GB)
Title: Improvements in the manufacture of cores for electromagnets, loading coils or the like
IPC: H01F1/24
Filed: 1929-10-24
Abstract: 338,321. General Electric Co., Ltd., and Polgreen, G. R. Oct. 24, 1929. Electromagnets. - Cores for electromagnets, loading coils or the like are made by heating powdered magnetic material in a solution of chromic anhydride and a halogen acid or halogen salt, the material being preferably washed thereafter, to remove any soluble substance, and subjected to high pressure. Powdered refractory material may be added to reduce the permeability of the core to any desired value and increase the insulation of the core particles. The powdered magnetic material may consist of an alloy containing about 80 per cent of nickel and 20 per cent of iron prepared, as described in Specification 327,865, by reducing in hydrogen and grinding oxides prepared by the precipitation of the hydroxides from a solution containing salts of the two metals. In an example of carrying out the invention, a powdered nickel-iron alloy is mixed with about 5 per cent of its weight of an aqueous solution of chromic anhydride and sodium chloride and is heated and stirred continuously until nearly dry. It is then thoroughly dried at 100‹ C., washed and dried again. A finely powdered, insulating, refractory material, such as ball clay, magnesia or alumina, is added in quantity to give the desired permeability and the mixture is formed into cores under high pressure. These are heat-treated to cause them to develop their final permeability and hysteretic value, for example at a temperature of from 500‹ C. to 600‹ C. In an alternative method, the soluble matter is left on the particles during the pressing process and is dissolved out of the core after the heat treatment by a prolonged washing. The sodium chloride may be replaced by ammonium, potassium, nickel or other chlorides or by hydrochloric acid.
Patent GB-814145-A (GB)
Title: Improvements in or relating to electric motor construction
Inventor: JR JOSEPH THOMAS CLARK
IPC: H02K1/14
Filed: 1956-10-23
Abstract: 814,145. Electric motors. LEECE-NEVILLE CO. Oct. 23, 1956, No. 32341/56. Class 35. A motor has a pair of end walls between which extend plates bent to form poles and carrying field coils. As shown, end plates 18, 19 of metal, plastic or fibrous sheet are secured, e.g. by welding to top and bottom plates 20, 21, the central parts of which form poles 12, 13 bent to provide tapering air gaps. The frame so formed may be left open, may be closed by four flat plates or by the two-part casing shown in Fig. 9. Fixing studs 57, 58 are welded to one end-plate.
Patent GB-964567-A (GB)
Title: Improvements in or relating to surgical devices
IPC: A61B18/18
Filed: 1962-08-23
Abstract: 964,567. Treating with light. I. H. KAUFMAN, and H. H. LEVEEN. Aug. 23, 1962 [Sept. 15, 1961], No. 32407/62. Heading A5K. [Also in Division G2] Apparatus for directing to a surgical locus a high intensity beam of light comprises a light source emitting light in the waveband 300-600 mÁ. and a flexible light guide. As shown in Fig. 3, the light guide comprises concentric fibre bundles 52, 54 and 56. At one end of bundle 54 is a light source 12<SP>1</SP> (e.g. incandescent lamp, mercury vapour lamp or optical maser) and a time - control shutter 211, which is preferably operable by the surgeon's foot and is mechanically connected to a filter mount 64 at one end of the bundle 52, so that, when the shutter is actuated, a blue/ green filter moves in front of the observing eye 63. The light from source 12<SP>1</SP> is used to effect photo-coagulation, being focused on the eye 72 to be treated by annular condenser 70 and lens 341. A lower intensity source 68 is at one end of the fibre bundle 56 and the light therefrom may first be used to locate the exact area of eye 72 to be treated. The fibres in bundle 52 may be tapered to enlarge the image viewed therethrough. Condenser lenses and fixed or variable apertures may also be provided for each fibre bundle at the end 62 of the device. In an alternative arrangement, only one fibre bundle is provided to transmit the high intensity light to the surgical focus.
Patent GB-1536118-A (GB)
Title: Working cylinders
IPC: F16C29/02
Filed: 1977-08-02
Abstract: 1536118 Pneumatic jacks KLINGER AG 2 Aug 1977 [12 Aug 1976] 32437/77 Heading F2T A pneumatic jack comprising a cylinder 5, a piston 1 and a piston rod 2, is characterized in that the piston 1 and the piston rod 2 are guided by bushes 3, 4 of permeable material, e.g. sintered carbon, through which some of the working fluid, e.g. helium, is pumped to provide lubrication. In the embodiment, helium passes through the cylinder walls 3<1>, 3<11>, and escapes through orifices 13 but holds the piston 1 to the rest position shown by producing a small back pressure. The working pressure is applied at an inlet 8. Helium to lubricate the piston rod 2 enters at 14 and escapes through a pair of holes opposite via bores 12.