baber/WOPTO huggingface dataset:
Patent GB-402973-A (GB)
Title: Improved manufacture of mixed anhydrides of silicic acid and carboxylic acids
IPC: C07F7/04
Filed: 1933-03-09
Abstract: Mixed acid anhydrides are prepared by treating carboxylic acids containing at least six carbon atoms in the molecule or their functional derivatives with silicon halides or with mixed anhydrides of silicic acid with carboxylic acids containing less than six carbon atoms in the molecule.  In examples: (1) stearic acid, lauric acid, coconut fatty acids, benzoic acid and naphthenic acids are treated with silicon tetrachloride: (2) stearic acid is heated with silicic-acetic anhydride: (3) a mixed anhydride is formed from silicon tetrachloride, acetic acid and acetic anhydride and stearic acid reacted with the crude product; volatile impurities are removed by heating in vacuo: (4) silicic-stearic anhydride is similarly prepared from crude silicic-propionic anhydride: (5) stearic acid is treated with silicic tetrabromide.  A sample furnished under Sect. 2 (5) is prepared from silicon tetrachloride and a -bromlauric acid. Carboxylic acids substituted by ether and thioether groups are referred to.  The products may be used in pharmacy and may be hydrogenated.  The Specification as open to inspection under Sect. 91 comprises also the use of heterocyclic carboxylic acids in the manufacture of the mixed anhydrides.  This subject-matter does not appear in the Specification as accepted.
Patent GB-820070-A (GB)
Title: Improvements in speed control mechanism for a.c. motor
IPC: B66C13/26
Filed: 1957-03-05
Abstract: 820,070. Control of A.C. motors. CLARKE, CHAPMAN & CO. Ltd., and LEE, R. S. March 5, 1958 [March 5, 1957], No. 7321/57. Class 38 (3). [Also in Group XXXV] A slip-ring induction motor 8 for driving a hoist is controlled by an electromagneticallyreleased brake having a coil 2 which is connected in series with self-excitation windings 23 of saturable reactors 3, 4, across rectifier 28. A transformer 25 in the stator circuit of the motor supplies the rectifier 28 in parallel with reactor windings 24, these windings being in series with a resistor 30 and contacts of a relay 29 which are closed on the first two hoisting and lowering steps of a master controller 20. Reactor control windings 21, 22 are in opposition and are respectively supplied through rectifiers 26, 27 in accordance with the stator and rotor voltages of the motor. As the motor accelerates from standstill, the reactors tend to saturate and the excitation of the coil 2 is reduced to apply the brake, whereby the motor operates at a stable creep speed. The brake may be used for stopping and holding the motor on subsequent steps of the master controller. In another arrangement, the brake coil is connected in series with a resistor across an A.C. source, the secondary windings of the reactors being connected in parallel with the brake coil. Opposing reactor control windings are energized respectively in accordance with a constant voltage and the rotor voltage, Fig. 1 (not shown). The brake coil may be supplied from a rectifier bridge which is in series with a resistor across the A.C. source. Secondary windings of the reactors are connected respectively in series with the brake coil and across the rectifier, Fig. 2 (not shown). In a further embodiment, the brake coil is fed from a rectifier bridge which is in series with secondary windings of the reactors. Other secondary windings of the reactors are connected in series with the brake coil across the rectifier. The reactor control windings are arranged so that the reactor is saturated at standstill, and de-saturates as the motor is accelerated, Fig. 3 (not shown).
Patent GB-1206253-A (GB)
Title: Gas burner
IPC: F23D14/26
Filed: 1969-02-11
Abstract: 1,206,253. Burners. KONINKLIJKE NEDERLANDSCHE HOOGOVENS EN STAALFABRIEKEN N.V. 11 Feb., 1969 [13 Feb., 1968], No. 7406/69. Heading F4T. In a non-atmospheric gas burner, particularly for natural gas and for use over a wide range of heat output, a nozzle 7, screwed on to a gas supply conduit and from which gas is allowed to flow into an air duct mounted in the wall of a furnace, Fig. 1 (not shown), comprises a duct 8 having a main orifice 10 in its end face 9, an annular part 13 of L-cross-section welded to the duct 8 to define therewith an expansion chamber for gas issuing from a number of smaller orifices 11 in the duct wall a short distance from the face 9, and a collar 14 on the duct extending outwardly beyond the part 13 and defining therewith a slit 16 from which the small quantity of gas issues and, under the action of the air flow round the collar, gives a flame which prevents the main flame from lifting off. In a second embodiment, Fig. 3 (not shown), the orifices 11 discharge into the chamber 12 upstream of the collar, which is secured to the part 13 and forms an annular passage with the duct 8. A ring or the duct downstream of the collar defines with the collar the outlet slit 16. The cross-section area of each orifice 11 is preferably less than one fifth of the cross-section area of the chamber 12 taken in any plane containing the longitudinal central axis of duct 8. Suitable dimensions of the nozzle parts are described. A burner giving full output when the gas pressure is one atmosphere above atmospheric may operate at less than 1 cm of mercury excess pressure e.g. for drying the bricks of a furnace.
Patent GB-387524-A (GB)
Title: Improvements in electric cable grips
IPC: H02G3/06
Filed: 1932-03-12
Abstract: 387,524. Couplings. HENLEY'S TELEGRAPH WORKS CO., Ltd., W. T., 11, Holborn Viaduct, London, and NICHOLS, W. H., Garthowen, Hervines Road, Amersham, Buckinghamshire. March 12, 1932, No. 7422. [Class 38 (i).] Sheathing, connection of.-An electric cable grip for securing the outer sheath of a cable at the point of entry into a junction box or other apparatus, comprises a soft metal cone 1 adapted to be compressed on to the cable sheath 14 and against the end of the box 10 by a ring 7 and bolts 8, the cone being provided with slits 2 extending from the small end and with circumferential ribs bearing against the face 12 at the large end. The slits stop short of the large end leaving the circumference there uncut. When the ring is tightened up, the small end of the cone is caused to grip the sheath 14, while the ribs bearing against the face 12 yield slightly to make a tight joint. An additional hard metal shell completely subdivided by slits may be provided.
Patent GB-208961-A (GB)
Title: Improvements in, or relating to, valve apparatus for rock drills and like fluid pressure operated tools
IPC: B25D9/20
Filed: 1923-03-14
Abstract: 208,961. Rayner, G. H. T., and Rayner, P. March 14, 1923. Addition to 192,277. Fluid-actuated gears.-In a gear of the kind described in the parent Specification, the fluid is supplied through a number of passages f<1>, and is fed to the underside of the valve by arc-shaped channels g<1>, g<2> in the chamber walls instead of by passages in the cover plates.
Patent GB-704501-A (GB)
Title: Improvements in or relating to spring seats, spring cushions, mattresses and the like
Inventor: COX LEONARD
IPC: A47C27/06
Filed: 1952-03-24
Abstract: 704,501. Spring upholstery. COX, Ltd., T. Feb. 16, 1953 [March 24, 1952], No. 7514/52. Class 52(4) A spring seating comprises main compression springs 1, the lower ends of which are connected to a helically wound flattened tension spring 6 by means of rivets 5 passing through the lowermost coils of the compression springs 1 and through a coil of the springs 6. The ends of the flattened base springs 6 are connected to brackets 7 for securing to a seat frame. The coil spring 1 at the front of the seat may be connected directly to a bracket 7 to which the adjacent end of the flattened spring is also riveted. The springs may be interconnected transversely by.metal strips 10.
Patent GB-1419742-A (GB)
Title: Winch with free-wheeling drum
IPC: B66D1/60
Filed: 1974-02-19
Abstract: 1419742 Winches CATERPILLAR TRACTOR CO 19 Feb 1974 [21 Feb 1973] 7516/74 Heading B8B [Also in Division F2] A winch comprises a winch drum 41 mounted on a winch drum shaft 39, Fig. 3, which is driven from a rotatable power input shaft 21 which may be coupled to the engine of a vehicle, the drum 41 being capable of free-wheeling on the shaft 39. A gear 22 on the shaft 21 meshes with a gear 23 on the input shaft 24 of a normally disengaged friction clutch 26 whose output shaft 27 mounts a gear 21 in mesh with a gear 31 of a normally engaged friction brake, so that when the clutch 26 is engaged and the brake 32 is disengaged the drive from the shaft 21 is transmitted to the above said gears, a gear 29 which is secured for rotation with the gear 28 meshing with a gear 33 to cause rotation of bevel gears 37, 38, the winch drum shaft 39 being connected to the bevel gear 38. A jaw type clutch 44 comprises a drive member 83 mounted on the shaft 39 for sliding movement along a spline 87, the drive member 83 normally engaging a driven member 84 fastened to the winch drum under the action of a spring 86 so that the drive from the shaft 39 is transmitted to the drum 41. When fluid under pressure is admitted via passages 93, 94, 96, 97 to a chamber 98 the drive member 83 is moved to the left along the spline 87 thus separating from the member 84 so that the winch drum 41 may be freely rotated relative to the shaft 39. The friction clutch 26 and friction brake 32 are fluid pressure operated.
Patent GB-1139764-A (GB)
Title: Apparatus for filtration of liquids in container
IPC: B01D29/00
Filed: 1966-02-21
Abstract: 1,139,764. Filters for liquids. SIMIMOTO SCIENTIFIC INSTITUTE CO. Ltd. 21 Feb., 1966 [5 March, 1965], No. 7554/66. Heading B1D. The apparatus comprises a container and (a) at least one hollow vertically-orientated body of a filter medium, the body being collapsible and expandable about its vertical axis while substantially maintaining its horizontal cross-section; (b) means establishing a liquid level within the container; (c) means for supporting the body and for maintaining it in an upright position in the liquid to be filtered in the container; (d) a flotation means slidably mounted on the supporting means, the flotation means being connected to the filter medium to maintain the filter medium below the liquid surface; (e) the flotation and support means and the filter medium being so constructed and arranged that the filter medium collapses and expands about its vertical axis in response to changing liquid level; (f) conduit means for filtered liquid leading from the inside of the hollow body to the outside of the container; and (g) conduit means located substantially at the base of the container for withdrawal of sludge. As shown, unfiltered liquid is supplied at 11 to a tank 10 having a rod 12 to the lower end of which the lower end plate 14 of a filter bellows 13 is fixed so as to be liquid-tight. The upper end of the bellows is connected liquidtightly to the underside of a circular float 15 which encircles the rod 12. Filtrate is withdrawn at 16 and settled material at 10b. The filter medium is preferably relatively thin, and may be filter cloth, porous metal sheet, woven wire screen, animal bladder, or regenerated cellulose. Fig. 2 (not shown), illustrates an underground storage tank for a filling station, the tank having a closed top through which the Withdrawal pipe extends downwards to a point near the tank bottom. The pipe is closed at its lower end by the lower end plate of a filter bellows, and the bellows and its float encircle the pipe. Fig. 3 (not shown) illustrates a tank having three filter elements. Each element has a lower end plate, with a central aperture, secured at that location to one pipe of a fixed pipe manifold, equivalent to pipe 16 of Fig. 1. Each element has an upper end plate secured by a rod to part of a float, the float being common to all three elements. The float is connected by lateral cables to buoyant rings, each ring being slidable on a separate vertical post extending between the top and bottom of the tank.
Patent GB-756494-A (GB)
Title: Improvements in or relating to bobbins for electrical coils
IPC: H01F5/02
Filed: 1954-03-16
Abstract: 756,494. Bobbins. GENERAL ELECTRIC CO., Ltd., and JONES, A. F. March 16, 1955 [March 16, 1954], No. 7629/54. Class 120 (3). [Also in Group XXXV] An electric coil bobbin comprises two or more concentric magnetic or non-magnetic metal sleeves 1, 2 between insulating flanges, the sleeves having longitudinal slits 3, 4 which coincide to provide a common gap.
Patent GB-601101-A (GB)
Title: Improvements in or relating to synthetic resins
IPC: C08G16/02
Filed: 1942-06-05
Abstract: Combustible synthetic resins are produced by condensation of a compound of formula RCX2NO2 (where R is H, alkyl, alkylol or aryl, and X is H or CH2OH with an aliphatic aldehyde in neutral, acid or alkaline medium at a temperature between room temperature and 150 DEG C.  Suitable compounds are nitro-paraffins, e.g. nitromethane, nitroethane or 1-nitropropane; phenylnitromethane, or nitro alcohols containing secondary or tertiary nitro groups such as b -nitro-ethanol; b -nitro-propanol; di-methylol nitro-ethane; di-methylol nitro-propane.  Mixtures of compounds may be used. Formaldehyde is the preferred aldehyde. Strong or weak alkalies, basic salts and/or nitrogen bases or salts of nitrogen bases may be used to adjust the reaction medium to the desired pH.  Nitrogenous bases are said to take part in the formation of the resin.  The reaction may be performed in aqueous or non-aqueous solvents or the reactants may be emulsified.  In example I a resin is prepared from formaldehyde, ammonia and 1-nitropropane, the reaction medium becoming neutral or even slightly acidic as the ammonia is taken up by the resin. Example II is similar but has an alkaline reaction medium due to a greater proportion of ammonia.  Example III is similar, oily products formed as a result of the initial stages of the reaction being removed before completion of resinification.  In example IV hexamethylenetetramine is present to produce an alkaline medium. In example V an ammonium salt and some free acid is present to yield an acid reaction medium.  In example VI sodium bicarbonate is used to make the medium alkaline.  Example VII is similar to example I but performs the reaction in water-xylene emulsion.  In example VIII the reaction medium is alkaline and alcoholic.  In example IX, dimethylol nitropropane, formaldehyde and ammonia are condensed together.  Example X uses dimethylol nitroethane, example XI b -nitrobutanol and example XII a mixture of b -nitrobutanol and dimethylolpropane.  In example XIII dimethylol nitropropane is employed and in example XIV a mixture of dimethylol nitropropane and monomethylol nitropropane.  The resins are soluble in liquid aromatic nitrocompounds, e.g. nitrobenzenes, nitrotoluenes, nitroxylenes and nitrophenols and in liquid nitric acid esters, e.g. nitroglycol nitroglycerine and molten pentaerythritol tetranitrate.  They may be used as ingredients of high explosives, propellants or pyrotechnic mixtures.
Patent GB-1530795-A (GB)
Title: Audio-frequency amplifier arrangements
IPC: H03G3/20
Filed: 1975-10-31
Abstract: 1530795 Amplifiers GENERAL ELECTRIC CO Ltd 31 Oct 1975 [25 Feb 1975] 7842/75 Heading H3T Overload in the output circuit of an audiofrequency power amplifier causes a sufficient voltage drop across one or both resistors 15, 16, to turn on corresponding transistors 17, 18 to produce a signal reducing the gain of an operational transconductance amplifier 2. The gain of amplifier 2 is controlled by the current through transistor 24 as determined by the charge on capacitor 21. An overload signal from transistors 17, 18 turns on transistor 20 to discharge capacitor 21 and reduce the gain of stage 2 to a level at which the output is not overloaded. Capacitor 21 discharges with a time constant of a few milliseconds and recharges when the overload signal is removed with a time constant of a quarter of a second.
Patent GB-552802-A (GB)
Title: Improvements in or relating to valve construction and pumps employing the improved valve construction
IPC: F02M59/00
Filed: 1941-03-28
Abstract: 552,802. Valves. STEVENS, A. H. (Thompson Products, Inc.). March 28, 1941, No. 7886/42. Divided out of 552,767, [Group XXVI]. [Class 135] [Also in Group XXVI] In a sliding vane pump 34, 36 a byepass valve is provided, comprising a hinged flap 192, a resilient facing 208 on the flap having spaced holes therethrough, washers 214 in said holes of smaller diameter than the holes, but thicker than the facing, a plate 210 resting on the washers, and bolts 212 connecting the plate; washers, and flap together. The valve is hinged to a U-shapped frame 196 secured in a recess of the body 106 by pins 200 slidably engaging holes in bosses 202. The valve is held in closed position by springs 204. Specification 552,801, [Group XXVI], is referred to.
Patent GB-788891-A (GB)
Title: Improvements in press stands
IPC: B30B15/04
Filed: 1956-03-14
Abstract: 788,891. Hydraulic presses. ALLMANNA SVENSKA ELEKTRISKA AKTIEBOLAGET. March 14, 1956 [March 18, 1955], No. 7929/56. Class 69 (2). A press frame comprises semi - circular yokes 10 and distancepieces 11 wound with layers of steel strip 12 applied under tension. The winding is covered by a sheet 17, and a sheet 16 and a piece of graphite - impregnated fabric 15 are interposed between each yoke 10 and the winding. To reduce the tendency for the distance - pieces 11 to bend outwards due to concentration of stress at their inner edges aused by the yokes 10 bending under the force of the winding 12, the distance-pieces 11 are cut away at 27 to displace the force on them outwards; alternatively, the end faces of the distance-pieces may be made not quite parallel.
Patent GB-543122-A (GB)
Title: Improvements in and relating to cinema and like projection screens
IPC: G03B21/60
Filed: 1940-05-02
Abstract: 543,122. Projection screens. BOWEN, E. WINDSOR-. May 2, 1940, No. 7930. [Class 97 (i)] A projection screen has an aluminium surface which has been etched or grained, anodized so as to produce a highly reflecting surface, and sealed by the action of hot water. Etching &c. may be effected as described in Specification 496,613, [Group XVI], anodizing may be effected as described in Specifications 436,154, [Group XXXVI], and 436,481, and the screen may be of composite structure as described in Specification 440,287, [Group II]. The aluminium may be of 99.5 per cent purity, its surfaces may be tinted, and the screen may be perforated and stressed.
Patent GB-1223132-A (GB)
Title: Improvements in or relating to vapour phase separation of a desired component from a gaseous mixture containing the same
IPC: B01D53/00
Filed: 1968-02-19
Abstract: 1,223,132. Separation of gases. TELLER ENVIRONMENTAL SYSTEMS Inc. 19 Feb., 1968, No. 7984/68. Heading C1A. [Also in Divisions C2 and C5] A component is separated from a gaseous mixture by passing the mixture into contact with a finely divided solid support material having adsorbed thereon a compound capable of reacting with the desired component to form a thermally decomposable product, the compound being absorbed in a layer of average thickness ¢ to 5 molecules or that part of the surface area accessible to its molecules, and raising the temperature of the product, after removal of the gaseous mixture, to above the decomposition temperature thereof to regenerate the gaseous component and the compound; the gaseous component separated being oxygen, carbon dioxide, nitrogen oxides, carbon monoxide, silicon tetrafluoride, hydrogen sulphide, benzene, toluene, xylene, methyl mercaptan, ethyl mercaptan, propyl mercaptan, butyl mercaptan, sulphur dioxide, hydrogen fluoride, hydrogen chloride, hydrogen bromide, hydrogen cyanide or boron trifluoride. Numerous examples of suitable compounds and support materials are given. The adsorbent particles may be supported in a fixed, moving or fluidized bed. A gaseous mixture may be passed through a series of beds to separate it into its components. Where more than one component is taken up by a particular compound, the product may be heated slowly so that, in suitable cases, the components may be separated by being regenerated at different temperatures. The regeneration step is carried out by passing a heated condensable gas, e.g. steam, a heated non-condensable gas or a purge stream of pure heated solute gas over the product of the adsorption stage. If a condensable gas is used it may be separated from the recovered component by condensation. Alternatively, the solute gas may be removed from the product of the adsorption stage by heating and pumping under vacuum.
Patent GB-124947-A (GB)
Title: Improvements in Pulley Blocks for Lowering Ships' Boats and similar Articles.
Inventor: REID ROBERT
IPC: B63B23/18
Filed: 1918-05-14
Abstract: 124,947. Reid, R. May 14, 1918. Pulley-blocks.-To prevent toppling-over of the lower pulley-block of tackle used for lifting and lowering ships' boats, &c., each of the usual sheaves employed is replaced by two or more sheaves b in the same plane, around which the rope is wound. Reference has been directed by the Comptroller to Specification 21718/13.
Patent GB-1476742-A (GB)
Title: Devices for securing contacts onto telephone relay parts
IPC: B23K11/30
Filed: 1975-02-27
Abstract: 1476742 Securing electrical contacts; forging; welding by pressure MAISON MURAT and R M X GLEIZES 27 Feb 1975 [27 Feb 1974] 8173/75 Headings B3A B3H and B3R A device for securing and shaping contacts on telephone relay parts 14 in strip form comprises a reservoir 22 for balls 21, a slide 23 which moves between a first position where it receives a plurality of balls from the reservoir and a second position where it supplies balls to recesses in an electrode 2, the electrode being movable between its ball receiving position and a further position where it welds the balls to the relay parts 14 in co-operation with a counter-electrode 5, means for driving the strip of relay parts in steps over the electrode, a forging head 3 and counter-forging head 6 for shaping the contacts, a unit for severing the relay parts from the strip and means for synchronizing the movements of the slide, the welding electrodes, the forging heads and the severing unit. The balls 21 are fed through conduits 25 into a plurality of holes 26 in the slide 23. The slide is moved against the action of a spring 31 and the balls drop through apertures 28 in the slide body 24 into recesses 19 in the electrode 2 in which they are held by suction. The electrode 2 is then moved to below the counter electrode 5, which is lowered by a spring loaded upper body 4. Welding current is passed through the electrodes, the electrode 2 being cooled, and as the body 4 rises, springs 1c raise a counter press 1b to strip the welded contacts off the electrode 2. The strip is then advanced and the welded contacts are aligned with the forging and counter-forging heads 3, 6, which form them to the desired shape on the next downward movement of the body 4. Finally the strip is advanced to the severing means. If necessary the strip may be passed through the device a second time to secure and shape contacts on the opposite side of each relay part 4.