baber/WOPTO huggingface dataset:
Patent GB-582490-A (GB)
Title: Improvements in resonating chambers employable in electron discharge devices of the velocity modulated type
IPC: H01J23/20
Filed: 1942-02-04
Abstract: 582,490. Velocity-modulated tubes. BRITISH THOMSON-HOUSTON CO., Ltd., and SCOTT, W. J. Feb. 4, 1942, No. 1503. [Class 39 (i)] In order to prevent trapping of electrons in the gap of a rhumbatron, the edges of the gap are made discontinuous by needle-like projections 2, Fig. 2, or serrations 3, Fig. 4, or the gap is covered by a corrugated grid 4, Fig. 6, or by a grid made up of serrated slats 6, Fig. 8. The form shown in Fig. 4 may be made by pressing a sheet which has had a star-shaped hole stamped out of it. The slats 6 may be interrupted in the centre to allow for expansion. Specification 582,484 is referred to.
Patent GB-716442-A (GB)
Title: Improvements relating to thermionic valve circuits
Inventor: MANSFORD HUGH LYON
IPC: H03F1/20
Filed: 1952-01-19
Abstract: 716,442. Valve amplifying circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Jan. 15, 1953 [Jan. 19, 1952], No. 1585/52. Class 40 (6) In an amplifier wherein signals are applied over a capacitor-resistor path to a valve having such a high resistance in the grid circuit that distortion would occur, the impedance seen by the grid of the valve is lowered to prevent distortion. The circuit is described as applied to a very wide band amplifier, Fig. 2, the signal applied at 10 being fed down an artificial line 13 tapped to provide signals for valves 7, 8 and 9 over small coupling capacitors 15, 16 and 17 having a small capacitance to earth. The signal is also fed over a capacitor 23 and resistor 24 of long timeconstant to a cathode follower 12 so that the grid resistors 18, 19 and 20 are fed from a low impedance source. The valves 7, 8 and 9 feed a second line as described in Specification 460,562. In a two-stage amplifier, Fig. 3, the output line 31 serves as the input to the second bank of valves 28, 29 and 30 feeding the output line 52. The low frequency signals are fed over cathode coupled pair 40, 41 to the grid resistors of the valves 28, 29 and 30 and are arranged to have unity gain. At very low frequencies the source impedance 55 tends to couple the stages and introduce negative feedback. The feedback signal appears equally at both ends of resistor 32 and the resulting signals are cancelled in the cathode coupled stage 40, 41, resistor 42 being adjusted to ensure this. Resistors are included in the cathode leads of all the valves to improve linearity. A cathode follower with A.C. coupling may be interposed between valve 41 and valves 28, 29 and 30 to allow the bias of the latter to be adjusted.
Patent GB-1249371-A (GB)
Title: A method for chemically cleaning surfaces coated with soot in boilers
IPC: F23J3/00
Filed: 1969-01-10
Abstract: 1249371 Cleaning boiler surfaces BEJS I VAESTERAS AB 10 Jan 1969 [19 Jan 1968] 1611/69 Headings C5G and G10B A pulverulent non-explosive soot removal agent having the composition disclosed in Specification 1001772, is introduced as a gaseous suspension directly into the hottest part of a boiler combustion chamber, through a jacketed tube 4. The soot removal agent from container 2 is entrained by a regulatable compressed air supply through line 3 and carried into the tube 4. Some of the compressed air passes through the line 5 to the surrounding jacket. Means 9, 10 to adjust the height or position of the tube 4 are provided. The supply of the agent can be automatically controlled in dependence on a predetermined time programme. In a modification (not shown), the expansion of air in an ejector may be used to draw the powdery agent into a mixing zone, from whence it is passed in suspension to the combustion chamber.
Patent GB-619677-A (GB)
Title: Improvements in or relating to process of manufacturing benzene hexachloride of verylow melting point and products obtained by such process
IPC: C07C23/12
Filed: 1946-01-17
Abstract: Benzene is treated with chlorine under the influence of light, the a and b  hexachloride isomers being separated by cooling and crystallising outside the reaction vessel, and one filtrate, which contains a  and other isomers, plus any washing liquid, is returned to the reaction vessel for further chlorination.  The final solution is evaporated to give a solid rich in the a  isomer, with melting point of about 70 DEG  C., which may be used by itself or admixed with other materials as an insecticide. Specification 613,519 is referred to.
Patent GB-136687-A (GB)
Title: Improvements in and relating to Diaphragms for Dry Gas Meters.
Inventor: SMITH ERNEST WILLIAM
IPC: G01F3/22
Filed: 1919-01-23
Abstract: 136,687. Smith, E. W. Jan. 23, 1919. Gas meters.-The diaphragm of a dry gas meter comprises an annular piece of leather &c. the inner edge of which is gripped between the inner edges of two metal rings, one edge being bent over the other, while freedom of movement is permitted between their outer edges by splaying them apart; the diaphragm is completed by a metal disk soldered to the outer metal ring near its periphery. As shown in Fig. 4, the leather x is laid over a metal ring d with beaded edges, and an outer metal ring a with a flange c is placed over the two; the flange c is bent over the leather and the ring d, and the leather thus secured. The outer edge of the leather is attached to a deep rim h, Fig. 8, by a fastening i, and the rim h is soldered to the meter casing. A metal disk g is soldered to the outer edge of the ring a, or the diaphragm may be completed in any other way.
Patent GB-994659-A (GB)
Title: Vinyl foam
IPC: C08J9/30
Filed: 1963-01-15
Abstract: A uniform open-cell polyvinyl chloride foam is produced by incorporating air into a polyvinyl chloride plastisol containing 1-8% of an alkali metal soap and 0.2-1.8% water.  Specified plasticizers are dioctyl phthalate, di-(2-ethyl-hexyl) phthalate, butyl decyl phthalate, dicapryl phthalate, butyl benzyl phthalate, dioctyl adipate, dioctyl sebacate, tricresyl phosphate, trioctyl phosphate, cresyl diphenyl phosphate, acetyl tributyl citrate, dipropylene glycol dibenzoate, an epoxidized fatty acid ester or an epoxidized glyceride, a butadiene-acrylonitrile copolymer or a mixture of two of the above.  The soap, e.g. an alkali metal salt of a fatty acid containing 12-24 carbon atoms, such as sodium laurate, myristate, palmitate, stearate, oleate, linoleate or linolenate, 1-8%, may be added to the dispersion medium or prepared in situ, by adding first the fatty acid and then the base, e.g. NaOH, KOH, Na2CO3 or K2CO3. The water may be added to this mixture and excess water must be distilled off.  A non-soap surface-active agent, 0.4-12%, e.g. polyethylene glycol 400 mono-laurate, a tertiary amine, ethylene oxide condensate with a primary fatty acid amine (soybean), or a coconut oil fatty acid amine/amine sulphonate composition may be added.  Other additives may be heat and light stabilizers, 0.5-6%, e.g. Pb, Sn, Zn, Cd or Ba compounds or complexes; fillers; less than 10%, e.g. CaCO3, talc or anhydrous magnesium silicate and colourants, 1%.  These may be added to all the dispersion medium or to a small portion which is later added to the rest.  The resulting emulsion is added to the polyvinyl chloride or to a copolymer containing vinyl chloride units of about 1.5m  particle size and the mixture frothed mechanically at 18-45 DEG  C., optionally gelled at 60-80 DEG  C. and fused to interconnect the cells, at 143-185 DEG  C.  Heating may be by radio frequency, dielectrics or hot air circulation. Specification 994,660 is referred to.
Patent GB-538481-A (GB)
Title: Improvements relating to concrete construction
IPC: E04B5/06
Filed: 1940-02-01
Abstract: 538,481. Concrete beams. SMITH, W. H. Feb. 1, 1940, No. 2009. [Class 20 (iv)] Reinforced concrete floor &c. beams of trapezial section are provided with transverse holes E for the insertion of re-inforcing bars. The floor is completed by filling the spaces between the beams with, concrete, dove-tailed keys or grooves being provided to key this concrete to the beams.
Patent GB-1454334-A (GB)
Title: Coins medals and the like
IPC: B23P13/00
Filed: 1974-01-16
Abstract: 1454334 Making coils; medals &c SOC ANON DES USINES A CUIVRE ET A ZINC DE LIEGE 16 Jan 1974 [17 Jan 1973] 02010/74 Heading B3A A method of making a coin, medal or similar article comprises hot or cold rolling an ingot of an alloy which is hardenable by means of thermal treatment, or hot rolling the ingot followed by cold rolling, cutting a blank from the as-rolled ingot, edge-forming the blank, striking the coin or medal, and thermally hardening the latter, wherein the method includes a heat treating step after the rolling or cutting operations to soften the metal of the blank. The coin or medal is made from a hardenable alloy, e.g. Cu-Ni-Si alloy, certain cupronickels, nickel silvers, German silvers, aluminium alloys or steels. Intermediate operations may be used during the manufacture, e.g. cleaning by scraping, milling of the surface, and shot-blasting in order to improve the surface finish. The thermal hardening involves a quenching operation for steels, or a quenching and ageing treatment for other alloys.
Patent GB-328231-A (GB)
Title: Improvements in electro-magnetic devices for use for example in the recording or reproducing of sound
IPC: H04R11/00
Filed: 1929-01-22
Abstract: 328,231. Graham Amplion, Ltd., and Rickets, W. J. Jan. 22, 1929. Magnetic instruments. - An electromagnetic device more particularly for use in the recording or reproduction of sound comprises a supporting member mounted so as to be movable about a real or virtual axis and an armature adapted to co-operate with a magnet pole or poles and attached to the supporting member at a point further from the axis than the heel of the armature. As shown, a supporting member 1 projects at right-angles from the centre of a cross-bar 2 clamped at both ends to pillar 3 and adapted to twist under the magnetic pull and thereby furnish the requisite restoring force. An armature 4 is attached to the free end of the member 1 and cooperates with magnet poles 6. The vibratory element may either be formed from the solid, the armature being separated from the supporting member by slotting excepting for a narrow elastic connecting piece 5 or the piece 5 may be replaced by a hinge and a separate spring provided. The diaphragm connecting rod 7 may be attached either to the member 1 or the armature 4. The armature 4 is preferably so arranged that, when it is furthest from the polar surface during vibration, its toe is nearer the polar surface than the heel, whilst when it is closest to the polar surface its heel is nearer to the polar surface than the toe.
Patent GB-864180-A (GB)
Title: Improvements in or relating to bucket levelling, elevating and tilting mechanisms ofmechanical shovels
Inventor: HUTCHINSON GEORGE VICTOR VALEN
IPC: E02F3/42
Filed: 1959-01-21
Abstract: 864,180. Shovelling machines. AVELING-BARFORD Ltd. Jan. 13, 1960 [Jan. 2, 1959], No. 2238/59. Class 68(1). The scoop 8 of a shovelling machine is maintained level when the scoop-supporting boom 4 of the machine is swung vertically by a link 22, 23 pivotally connected at 25 to the scoop 8 and at 26 to an arm secured to a gear sector or wheel 12 pivotally mounted on the boom at 13 between the ends thereof and meshing either directly or indirectly through an idler gear pivoted on the boom with a fixed gear wheel or segment 11 mounted on the chassis of the machine about the axis of rotation of the boom thereon. The link may be a fluid-actuated jack 22, 23 which permits of moving of the scoop relative to the boom during the breakout or dumping phases of operation of the machine. The boom may be swung by fluid-actuated jacks 15, 19 as shown or by a rack and pinion drive of which the pinion is secured to the boom about the axis of rotation of the boom.
Patent GB-1040631-A (GB)
Title: Improvements in or relating to apparatus for use in detecting failure in heat transfer systems
Inventor: HERZBERGER PETER
IPC: F28F27/00
Filed: 1964-01-17
Abstract: 1,040,631. Temperature alarms. EUROPEAN ATOMIC ENERGY COMMUNITY (EURATOM). Jan. 17, 1964 [Jan. 17, 1963], No. 2249/64. Heading G4N. Rapid change in the resistance of a heat exchanger component, indicative of a rapid rise in temperature which would result in burn out, is detected by a bridge circuit including the component and an amplifier receiving the bridge output and amplifying a restricted band of frequencies. In Fig. 2 (not shown), the component is earthed at its mid-point and forms two arms of the bridge. The other two arms are resistances 16, 18 and the bridge output is taken between the junction point of these resistances and earth. The amplifier passes frequencies between 2 and 20 cs., and if the input signal in that band exceeds a threshold value (2 mV) the amplifier output fires a pair of back-to-back thyratrons to operate a circuit-breaker. Relays 14, 15 short-circuit the signal to the circuit breaker if faults occur in the protective system which might induce spurious operation. In another arrangement (Fig. 3, not shown), pairs of components form a bridge and the output signal from each pair is fed to a differential amplifier. The outputs of these amplifiers are paired and fed to further differential amplifiers so that a single output is obtained which fires the thyratrons as before.
Patent GB-678317-A (GB)
Title: Improvements in sine wave semi-conductor oscillators
IPC: H03B5/12
Filed: 1950-01-30
Abstract: 678,317. Semi-conductor circuits. RADIO CORPORATION OF AMERICA. Jan. 30, 1950 [Jan. 28, 1949], No. 2367/50. Classes 40 (v) and 40 (vi). An oscillator comprises a transistor, the electrodes being biased so as to provide a negative resistance between the base electrode and a point of reference potential, and a resonant circuit being connected between the base electrode and the said point. Fig. 2 shows a transistor comprising a block of semi-conducting material 1, base electrode 4, emitter electrode 2 and collector electrode 3. A parallel resonant circuit is connected between the base electrode 4 and ground, and with suitable biasing potentials applied to the emitter and collector electrodes, a negative resistance characteristic exists between the base electrode and earth, so that oscillations are produced. The output may be taken from the resonant circuit by an inductive coupling 17. A method of measuring the negative resistance between base electrode and earth is described, this characteristic being a function of the emitter bias. Alternative arrangements provide for the base electrode to be connected to a tapping on the inductance of the resonant circuit, or for the output to be taken from the collector by resistance capacity coupling. Fig. 7 shows a modification in which phase shift networks 27, 32 and 22, 33 are included in the collector and emitter circuits respectively, which allows oscillations to be produced at higher frequencies. Alternatively, a seriesresonant circuit may be connected between the collector and earth or between the emitter and earth to improve operation at higher frequencies, and the output may be taken from a coupling with the series resonant circuit. In a further arrangement, oscillations at a harmonic frequency may be produced by providing a parallel resonant circuit tuned to a harmonic frequency, in the collector circuit. Keying of the oscillator may be provided by applying signal pulses, which may be width or time modulated, to either the emitter or the base electrode, the biasing arrangement being such that these electrodes are biased in a non- conducting direction except when pulse signals are applied, so that oscillations are produced only during the occurrence of each pulse.
Patent GB-1219081-A (GB)
Title: Improvements in and relating to means for generating internal and external involute and non-involute gears
Inventor: CLEFF PETER HERBERT
IPC: B23F1/02
Filed: 1967-01-17
Abstract: 1,219,081. Gear grinding. PRECISION KINEMATICS (GEARS & MECHANISM) Ltd. 1 Feb., 1968 [17 Jan., 1967], No. 2377/67. Heading B3K. A gear generating machine for generating internal or external spur or helical gears of involute or modified involute tooth form has a bed 1 with a rotary work-table 2 at one end and a stanchion 15 adjustable in centre distance CD towards and away from the work-table, an outrigger slide 16 vertically slidable on the stanchion and a set of three concentric cylindrical individually and conjointly reciprocable and rotatable ram slides 20, 21, 22 mounted in the slide 16, the ram slipe 22 carrying at its lower end means supporting a formed grinding wheel 24. The work-table 2 together with the gear 4 upon which teeth are to be finish ground is rotated by a worm-wheel 6 and worm 7 driven from a motor 10 and during grinding the three ram slides 20, 21, 22 are rotated together in meshing relation to the rotation of the gear 4 through a worm 17 and worm-wheel 18 also driven from motor 10. Ram slide 20 together with ram slides 21, 22 is also reciprocated continuously during grinding by means of fluidoperated piston and cylinder 27, 28. Differential spline couplings 53a, 53b and 54a, 54b provide for the connection and disconnection of the three ram slides under the action of springs 62, 63 and of fluid-operated piston and cylinder units 51, 56, and 52, 55 so as to allow indexing of the grinding head during the non- grinding cycle time. The rotation of ram slides 21, 22 relatively to each other and to ram slide 20 for indexing purposes is effected by motors 42 and 49 and gearing 46, 47 and 44, 45 under programme control means. In order to machine helical teeth an additional rotational motion has to be superimposed on (or subtracted from) the rotation of the ram slide 20 and this is effected by means of racks 19 secured to and reciprocable with the slide 20 the racks 19 having inclined teeth in mesh with corresponding teeth of racks 35 secured to further racks 34 which mesh with gears 33 which themselves mesh with an internal gear 36 secured to the worm-wheel 18. In a modified form shown on the left-hand side of Fig. 2 the single gear 33 is replaced by a pair of parallel mounted gears 37, 38 with lead-change gears 40 therebetween the arrangement being such that with one set of racks 19 varying helix angles of the gear teeth may be obtained by changing the gears 40. The grinding wheel 24 is adjustable to the desired helix angle and means 61 are provided for form-dressing and truing and wear compensating the grinding wheel. In an alternative the spline couplings are placed at the upper ends of the ram slides or may be replaced by differentially acting optical or electrical gratings and cone or flat-faced friction clutches.
Patent GB-1343741-A (GB)
Title: Separation of a-cedrene from the hydrocarbon fraction of cedar wood oil
IPC: C07C7/148
Filed: 1972-01-18
Abstract: 1343741 Hydrocarbons from cedar wood oil L GIVAUDAN & CIE SA 18 Jan 1972 [18 Jan 1971] 2402/72 Heading C5E α-Cedrene is separated from the hydrocarbon fraction of cedar wood oil which, in addition, contains #- cedrene and thujopsene isomers by (a) reacting it with a strongly protonating acid having a pK of 4 or less, wherein the #-cedrene is isomerized to α-cedrene and the thujopsenes are converted to higher boiling chamigrenes and tricyclic  hydrocarbons and (b) fractionally distilling off the α-cedrene from the mixture so obtained. Examples of suitable acids are formic, oxalic, sulphuric, orthophosphoric, polyphosphoric, perchloric, and toluene sulphonic acids. In addition an alkanoic monocarboxylic acid with 2 to 6 C atoms, e.g. acetic acid, can be used in conjunction with the above acids.
Patent GB-1138075-A (GB)
Title: Improvements in or relating to preparation of stable acetal peroxides
IPC: C07C409/20
Filed: 1966-01-19
Abstract: 1,138,075. Acetal peroxides. HENTSCHKE & SAWATZKI, and K. GABELEIN. 19 Jan., 1966 [22 Jan., 1965], No. 2429/66. Heading C2C. [Also in Division C3] Acetal peroxides are prepared by reacting an ethylenically unsaturated aliphatic or alicyclic compound which is free of halogen atoms, amino or sulphide groups, with ozone in the presence of a primary, secondary or tertiary alcohol containing at least 5 carbon atoms the carbon chain of which may be interrupted by oxygen. The unsaturated compound may be a hydrocarbon, alcohol, aldehyde, ketone or carboxylic acid. It is preferred to effect ozonolysis at temperatures below 70‹ C. These acetal peroxides are more stable than those obtained from lower alcohols. Examples relate to the preparation of derivatives of sorbic acid, castor oil, olive oil, cedar wood oil and oleyl alcohol, and polyethylene glycol ether, dodecanol, polyoxyethylene, stearyl alcohol, iso-tridecyl-2-ol and benzyl alcohol.
Patent GB-945351-A (GB)
Title: Long-span bridge
IPC: E01D19/16
Filed: 1960-01-22
Abstract: 945,351. Bridges. A. MANTSCHEFF. Jan. 22, 1960 [Jan. 29, 1959], No. 2460/60. Heading E1G. A pre-stressed concrete roadway beam 10 is supported by pre-stressed concrete ties 15 supported in towers 11. The ties either are rigidly anchored to the towers, or extend through the. towers on roller or other bearings, Fig. 5 (not shown), to prevent lateral stresses. The reinforcing elements in the ties 15 sag by varying amounts so as to bunch together in the lower part of the tie near its centre.
Patent GB-910657-A (GB)
Title: Improvements relating to motor vehicles
IPC: B60P3/42
Filed: 1960-01-22
Abstract: 910,657. Vehicle bodies. DAIMLER-BENZ A.G. Jan. 22, 1960 [Jan. 27, 1959], No. 2467/60. Class 108(1). A vehicle body is provided with a number of attachment points which may be in the form of apertures, sockets, shafts or rails at the positions indicated in Fig. 1. These attachment points may be used for hammocks, tents, roof racks and for anchorages for ropes securing freight in position.