baber/WOPTO huggingface dataset:
Patent GB-937891-A (GB)
Title: Process for the preparation of polycarbonates
IPC: C08G64/20
Filed: 1961-11-21
Abstract: <PICT:0937891/IV(a)/1> In a process for making polycarbonates by reacting bis-phenol A with phosgene in an aqueous alkaline medium, the reaction is effected in the presence of a water-immiscible liquid which is a solvent for lower molecular weight polycarbonate but a non-solvent for higher molecular weight polycarbonate so that the polycarbonate is precipitated on reaching a substantially uniform molecular weight.  The water-immiscible liquid may be n-propyl chloride, n-butyl chloride or amyl chloride or it may be a mixture of a solvent (e.g. methylene chloride, ethylene chloride, 1 : 4-dichlorobutane, benzene or xylene) and a non-solvent (e.g. isopropyl ether, n-butyl ether, isooctane or heptane).  The reaction mixture may also include catalysts (e.g. quarternary ammonium compounds or tertiary amines) or additives such as antioxidants and substances which react preferentially with phosgene decomposition products (e.g. sodium dithionite, potassium bisulphite or carbon monoxide).  In Fig. 2, an aqueous alkaline solution of bis-phenol A, catalyst and partial solvent are supplied to a reaction vessel 1 and phosgene is introduced gradually into the vessel.  The output from the reaction vessel 1 passes to a second reaction vessel 48 (in which further phosgenation may be effected.  A third reaction vessel may also be provided.  The output from reaction vessel 48 passes to a centrifuge 17 wherein the reaction mixture is washed with a fresh portion of partial solvent and from which crude precipitated polycarbonate passes to a tank 50 where it is neutralized with an acid (e.g. hydrochloric, orthophosphoric or carbonic acid) and then distilled.  The azeotropic mixture of water and partial solvent from tank 50 passes via a condenser 58 to a phase separator 59 from which the water is recycled to the tank whilst the partial solvent is removed for storage.  Polymer slurry, free of partial solvent, is passed from the tank 50 to a centrifuge 64 in which the polycarbonate cake is treated with de-ionized water and then transferred to a vacuum dryer 70 and a degassing extruder 72.  Filtrate from the centrifuge 17 passes to a phase separator 22 from which the aqueous phase is passed to a neutralizing tank 73 wherein bis-phenol is precipitated by adding an acid (e.g. hydrochloric, sulphuric or carbonic acid).  The organic phase from separator 22 passes to a flash vapourizer 31 from which a concentrated solution of low molecular weight polymer is recycled to the reaction vessel 1.  The heads from the flash vapourizer 31 are separated into their solvent and nonsolvent portions in a distillation column 36.  Specification 772,627 is referred to.
Patent GB-919535-A (GB)
Title: Method of, and apparatus for, testing hydrogen
IPC: G01N27/18
Filed: 1959-12-08
Abstract: The deuterium content, or the ortho-para ratio, in hydrogen containing deuterium which has been freed at a low temperature from nitrogen and other low boiling gases is measured by means of a katharometer: where deuterium is to be determined, the o/p ratio of both the hydrogen to be tested and a standard sample of the hydrogen is adjusted to the equilibrium value at the temperature of the wire before introduction into the katharometer; where the o/p ratio is to be determined, a portion of the hydrogen is thus adjusted and passed into the reference cell and a second, unadjusted portion is introduced into the measuring cell.  The adjustment of the o/p ratio may be achieved by passing the hydrogen at the required temperature over a catalytic material such as palladium, cobalt, titanium or other paramagnetic substance which may, if desired, be supported on asbestos, silica gel or ferric oxide gel: room temperature is frequently sufficient since the o/p ratio changes little above this temperature.  After freezing out or adsorbing nitrogen, carbon monoxide and oxygen, e.g. with silica gel at low temperatures, any neon and helium still remain in the hydrogen: such a mixture may be passed through a gas chromatography column packed with a molecular seive zeolite before adjustment of the o/p ratio, whereby the gases helium neon and hydrogen are separated and successively passed through a conductivity cell.  Pure hydrogen may be produced by this means and employed as comparison gas in the determination of a deuterium-containing hydrogen to be subsequently employed as a reference gas.  Several procedures are described in relation to Figs. I-IV (not illustrated).
Patent GB-894029-A (GB)
Title: Process for the purification of 1-dehydro-17ª--methyl-testosterone
IPC: C07J1/00
Filed: 1960-12-05
Abstract: Selenium impurities contaminating 1-dehydro-17a -methyl-testosterone which has been obtained by dehydrogenating 17a -methyl-testosterone with a selenium compound having a dehydrogenating action are removed by treating the crude 1-dehydro-compound with hydrogen peroxide, separating the resulting acidic fraction from the neutral fraction, treating the neutral fraction with an adsorbent and recovering the purified 1-dehydro-compound from the neutral fraction. Advantageously the crude 1-dehydro-compound, obtained, for example, by a dehydrogenation process using selenium dioxide or selenious acid, is dissolved in a solvent such as acetic acid and treated with a 30% aqueous solution of hydrogen peroxide at room temperature, the product, obtained for example by precipitation with water and filtration, is dissolved in an organic solvent, e.g. toluene or ethyl acetate, and extracted with a aqueous alkaline reagent, such as sodium carbonate, the neutral fraction remaining in solution in the organic solvent is then treated with an adsorbent, such as aluminium oxide, for example by passing the solution through a column of the adsorbent or by adding adsorbent to the solution and filtering off the solid material, and the 1-dehydro compound is then recovered from the solvent by, for example, evaporating the solution and recrystallising the residue.  An example is given.
Patent GB-1373654-A (GB)
Title: Shanked tools and holder therefor
IPC: E21C35/19
Filed: 1971-09-08
Abstract: 1373654 Mineral-mining; pick-holder assemblies AUSTIN HOY & CO Ltd 8 Sept 1971 [22 Dec 1970] 41969/71 Heading E1F A mineral-mining cutter tool having a shank of constant rectangular cross section for mounting in a socket in a holder and a head integral with the shank and having a leading cutting part arranged to cut in a given direction relative to the shank has at the rear of the head an abutment face which is inclined upwardly and rearwardly relative to the longitudinal axis of the shank and faces away from the cutting part for engagement with a similarly inclined face on the holder when the shank is inserted into the holder. Preferably the inclined face extends at an angle of about 135‹ to the longitudinal axis of the tool and adjoins a face of the shank. The configuration of the holder for such a tool is also described. Specifications 1308298 and 1373655 are referred to.
Patent GB-904717-A (GB)
Title: Storage bunker
Inventor: DUNCAN ANGUS WELLESLEY
IPC: B65G47/51
Filed: 1959-12-11
Abstract: 904,717. Storage bunkers. MINING ENGINEERING CO. Ltd. Nov. 18, 1960 [Dec. 11, 1959], No. 42139/59. Class 78 (4). The bottom of a bunker providing temporary storage in a mine transport system is formed by a belt 13 (Fig. 2) which can be rolled or folded downwardly from the outbye end towards the inbye end to permit material to fall from the bunker. In the form illustrated the belt is anchored on its upper run at 15 and passes over closely spaced rollers 26 and a reversing drum 16 to a two-drum winch at the inbye end. The rollers 26 and drum 16 are carried by a trolley 28 (Fig. 4) supported by rollers 29 from rails 32 so that, as the winch draws the belt in, the trolley is retracted with the belt to leave the bottom of the bunker 10 clear. The trolley can be propelled outbye again by a cable (not shown) from the second drum of the winch. The trolley 28 may comprise articulated portions, and the frame of the bunker may also be articulated so that it adapts to unevenness in the floor. The bunker is shown as fed by a telescoping belt conveyer 12 and is discharged by a scraper conveyer 18 which has an inclined portion 19 to which the belt 12 can deliver directly. Alternatively the bunker may be alongside the belt 12 and may be fed from it by a plough. The belt 12 may be capable of delivering directly to wagons at the outbye end of the bunker.
Patent GB-1074716-A (GB)
Title: Needle positioning device for sewing machine
IPC: D05B69/22
Filed: 1965-10-05
Abstract: 1,074,716. Sewing machines. SINGER CO. Oct. 5, 1965 [Oct. 7, 1964], No. 42203/65. Heading D1G. [Also in Division H2] A sewing machine is provided with mechanism for counter-rotating the upper arm shaft to a predetermined position when the machine is stopped. The upper shaft is driven from an intermediate driven shaft 36 by means of a belt 41 engaging a pulley fixed thereon. The shaft 36 carries a centrifugal switch 50 (see Division H2) which actuates the mechanism when the shaft is almost at rest. A flange 73 keyed to a shaft 34 journalled in shaft 36 may be oscillated by means of a rack 91 engaging a pinion 90 on the flange hub 71. A plunger 75 (see also Fig. 3) in the flange is biased radially inwards by a spring and engages an abutment 44 on the shaft 36. The flange is normally at rest with the plunger held outwards and clear of the abutment by stationary cam means. When the primary drive has been disconnected and the shaft 36 is almost at rest switch 50 actuates a pneumatic piston to push the rack and rotate the flange one revolution. The plunger springs to its inward posittion, entrains the abutment 44 whatever its angular position and rotates shaft 36 and the connected upper arm shaft to its predetermined position. At the end of the piston stroke a switch is operated to withdraw the piston which rotates the flange and plunger to its rest position.
Patent GB-1483455-A (GB)
Title: Radial flow blowers
IPC: F04D29/44
Filed: 1973-09-08
Abstract: 1483455 Centrifugal blowers NU-WAY HEATING PLANTS Ltd 21 Aug 1974 [8 Sept 1973] 42348/73 Heading F1C A radial-flow blower comprises a spiral casing 10, Fig. 2, having a tangential outlet and an inlet 21 in an axial end-wall 20 thereof. The axial dimension of the impeller is between 30 and 85% of the internal axial dimension of the casing and the  impeller is spaced from the wall 20 by a distance which is the greater part of the difference between said axial dimensions, whereby a return flow path 19 is established from space 18 to the interior of the impeller. A guide member 22 partly surrounds the inlet 21 and extends into the impeller as shown. The end of the guide member adjacent the hub 23 may completely surround and be supported by the hub. The inlet 21 is a sector-shaped opening with its centre of area offset from the impeller axis, the leading edge of the inlet opening, with regard to the direction of rotation, lying between 0 and 135 degrees to the axis of the outlet and the trailing edge defining with leading edge an included angle of between 45 and 240 degrees. Inlet 21 may be provided with a pivoted flap or shutter for varying the included angle.
Patent GB-1192437-A (GB)
Title: A Hermetically Sealed Electric Switch
IPC: H01H21/08
Filed: 1967-09-19
Abstract: 1,192,437. Switch cases. CROUZET. 19 Sept., 1967 [30 Sept., 1966], No. 42584/67. Heading H1N. [Also in Division F2] A hermetically sealed snap action switch having control levers 7, 8 interconnected by a rod 9 has an air-tight closure between the rod 9 and stainless steel housing 5 provided by a resilient thin stainless steel membrane 10 secured to a lip 6a defining a housing aperture and to rod 9 by resistance or arc welding at sub-atmospheric pressures. The membrane is formed by stamping or embossing a sheet.
Patent GB-1364867-A (GB)
Title: Electrical coupling between elements in relative motion in res pect of each other
IPC: H01R35/02
Filed: 1971-09-13
Abstract: 1364867 Electric couplings THOMSON-CSF 13 Sept 1971 [22 Sept 1970] 42600/71 Heading H2E For making electrical connection between members A and B while permitting limited relative rotational movement between them, leaf spring R is located between adjacent parallel walls of A and B and its ends are electrically connected to terminals a and b on A and B respectively, such that in the course of the relative movement spring R rolls on the walls without slip and with substantially constant curvature, the mechanical characteristics of the spring being such that during movement the elastic limit is not reached. As shown in Fig. 2, terminals a, b coincide with the points of attachment; alternatively as in Fig. 5, springs R2' R7 are soldered to studs c2, d2 and c7, d7 which are soldered to terminals a2, b2 and a7, b7 respectively, mounted on the outside surfaces of members A and B and possibly electrically connected to printed circuitry thereon. Members A, B may be insulating or conducting, and if conducting, the springs, which may be beryllium bronze, are coated with insulating material apart from their points of contact. Twelve pairs of springs may be circumferentially arranged around members A, B, alternate springs being axially offset to provide two axially offset groups (Fig. 3, not shown) having springs of different sizes (Fig. 5).
Patent GB-1241849-A (GB)
Title: Improvements in the manufacture of cargo slings
Inventor: DAVENPORT PETER LINDSAY
IPC: B29D29/00
Filed: 1968-09-10
Abstract: 1,241,849. Coating filamentary cores. P. DAVENPORT Ltd. 8 Sept., 1969 [10 Sept., 1968], No. 42902/68. Heading B5A. [Also in Divisions B8 and F2] A method for the production of a cargo sling comprises applying a coating of settable synthetic plastics material 26 (Fig. 2) in fluid state to a continuous core 6, winding the coated core into a helical configuration (Fig. 1 and Fig. 3) with adjacent turns in contact, and allowing the plastics coatings to adhere and unite one with another and set in the united state to form the cargo sling. The core may comprise a bunch of continuous filaments of synthetic textile material, or filaments of polyamide or polyester material. The synthetic plastics coating material may be a thermoplastic polyolefin polymer which becomes fluid when heated and sets when cooled, and in the fluid state will adhere to, and unite with, other previously separated portions of the same polymer in fluid state, when the portions are brought into contact. The synthetic plastics coating material may be polyethylene. The core material is wound from a reel 4 and passes through a housing 10 to which the coating material is fed by a screw 22. The coated core is extruded from a nozzle 14 of the housing 10 and is wound in side-by-side coils on a drum 88 the diameter of which corresponds to the desired sling diameter.
Patent GB-1164039-A (GB)
Title: Improvements in or Relating to Hydrazide Derivatives
IPC: A61K33/32
Filed: 1967-09-21
Abstract: 1,164,039. Salts of substituted malonic acid hydrazide. BYK-GULDEN LOMBERG CHEMISCHE FABRIK G.m.b.H. 21 Sept., 1967 [19 Oct., 1966], No. 42988/67. Heading C2C. Hydrazides of formula wherein R is a straight-chain, branched or cyclic alkyl or alkenyl radical having up to 10 carbon atoms inclusive and optionally interrupted by an oxygen, sulphur or nitro group, an aryl or aralkyl radical wherein the aromatic ring is optionally substituted by halogen, a hydroxy, alkoxy, nitro, amino or dialkylamino group, R 1  is hydrogen or any of the radicals defined for R, Ar is phenyl which is optionally substituted by halogen, alkyl and/or alkoxy groups of up to 3 carbon atoms inclusive or hydroxy, and X is a metal other than sodium, n being the valency of the metal, or X is the ammonium radical or a quaternary ammonium radical in which at least one of the hydrogen atoms of the ammonium radical is replaced by optionally substituted alkyl or aralkyl, are prepared by reacting a solution of the sodium salt of the said substituted malonic acid hydrazide with a salt of the general formula (II) X-Y wherein X is a salt-forming cation as defined above, and Y is an anionic radical, and thereafter, extracting the required salt with an organic solvent immiscible with water.
Patent GB-1037139-A (GB)
Title: Adjustable girder for supporting forms for casting concrete
IPC: E04G11/56
Filed: 1964-10-21
Abstract: 1,037,139. Telescopic girders for supporting shuttering. R. D. RAMBELLE. Oct. 21, 1964 [Nov. 13, 1963], No. 43008/64. Headings E1K and E1S. In a telescopic girder for supporting shuttering for casting ceilings &c. the outer part 1 is of box section and has one or more longitudinal flanges 7 highest in the centre and tapered towards each end to produce a cambered surface supporting the shuttering which is flattened under. the weight of the concrete. The inner part is an I-beam 8 having a strip of polyvinyl chloride 13 held in its upper channel flange 9 to which the shuttering may be nailed. The box section 1 is formed with channels 15 at the sides also holding polyvinyl chloride strips. The ends of the box and I-sections are cut away leaving the channels 15, 9 respectively protruding as supports for the girder. In a modification one side of the box section comprises two parts 29, 30 Fig. 8 in the same plane connected by bolts 32.
Patent GB-1315021-A (GB)
Title: Apparatus for the manufacture of helical coils for sliding clasp fasteners
IPC: B21F45/16
Filed: 1970-09-09
Abstract: 1315021 Sliding clasp fasteners OPTI-HOLDING AG 9 Sept 1970 [16 Sept 1969] 43050/70 Heading B5A In an apparatus for the manufacture of helical coils from plastics monofilament for sliding clasp fasteners, plastics monofilament 9 is fed into the apparatus from a rotating spool (4, Fig. 1, not shown), through feeding rolls 20, 17, 18 to a winding unit 7, 8 where the plastics monofilament 9 is wound on to a winding mandrel 6 secured to a mandrel holder 5, the mandrel holder having two mutually off-set entry and exit sections 5a, 5b, respectively, joined together rigidly by a member 14, one part 7 of the winding unit being rotatable about the entry section 5a and the other part 8, being rotatable, synchronously with the part 7, about the exit section 5b; a " take off " unit 10 is provided to take the finished coil 11 of the mandrel 6. In the embodiment shown, two sets of the apparatus of the invention are provided alongside each other in a common frame. As shown in Fig. 4, which is a part-sectional side elevation of Fig. 3, the parts 7, 8 and a further rotating member 29<SP>1</SP> for guiding the monofilament, are driven synchronously by toothed belts 30 and a common motor 21. A filament guide channel 23 is provided within the part 8 and is secured against rotation about its own axis as it rotates about 5b, an epicyclic transmission 24 being provided for that purpose. A core filament 25 may be introduced centrally of the coil by means of a central bore 26 in the mandrel holder, the core filament being fed in from a spool 28 by a take off unit 29.
Patent GB-988373-A (GB)
Title: Thermally stable substances
Inventor: MCCALL ERNEST BRYSON
IPC: C07D307/91
Filed: 1961-12-01
Abstract: A mixture of isomeric monobenzyldiphenyl ethers is prepared in an example by reaction of diphenyl ether and benzyl chloride. Compounds containing an aralkyl group substituted in a structure that has two aromatic rings linked to each other directly or through an oxygen or sulphur atom are used as functional fluids, e.g. as a heat transfer medium, a dielectric or hydraulic fluid, a lubricant, or as the stationary phase in a vapour phase chromatogram.  The linked aromatic rings are preferably phenyl or naphthyl.  The number of aralkyl groups, preferably benzyl, may be one to four.  The aromatic rings may contain halogen, alkyl, cycloalkyl or alkoxy groups.  Specified substances are 3-benzyldiphenyl ether; 1,4-dibenzyldiphenyl; 1,31 - dibenzyldiphenyl ether; 2,41 - bis - (p - methylbenzyl) diphenyl ether and 1,21,41-tribenzyldiphenyl ether.ALSO:A substance that contains an aralkyl group substituted in a structure that has two aromatic rings linked to each other directly or through an oxygen or sulphur atom may be used as the stationary phase in a vapour phase chromatogram.  A typical substance is a monobenzyl diphenyl ether.. Other substances mentioned are 1,4-dibenzyl-diphenyl; 1-31-dibenzyl-diphenyl ether; 2,41-bis(p-methylbenzyl) diphenyl ether and 1,21,41-tribenzyl diphenyl ether.
Patent GB-1035530-A (GB)
Title: Improvements in or relating to thermoelectric heat pump units
IPC: H01L35/32
Filed: 1963-11-04
Abstract: 1,035,530. Thermocouple assemblies. T. M. ELFVING. Nov. 4, 1963 [Nov. 9, 1962], No. 43489/63. Heading H1K. A thermocouple assembly comprises pairs of thermo-elements connected in series by conducting bridges arranged in parallel planes on opposite sides of the elements. The assembly is mounted between ceramic plates of high heat conductivity having metallized areas in contact with the bridges, the edge of the plates being sealed off by a thermally insulating member. In a typical arrangement a sub-assembly consisting of thermo-elements about 1-3 mm. long with a length-diameter ratio of 1 to 3 or less soldered to copper bridges 11, 12 is assembled within heat insulating ring 18 between alumina or beryllia cover-plates 16, 17. The plates are metallized on the outer surfaces and on areas of the inner surfaces corresponding to the bridges, and pieces of soft solder placed between these areas and the bridges. Metallizing is effected by applying molybdenum-manganese alloy or a suspension of silver in an organic binder followed by heating. While clamped the assembly is heated to solder on the plates without melting the solder between the bridges and thermo-elements. Finally, the edges are sealed with epoxy resin and the assembly evacuated and sealed off. To reduce heat leakage by radiation, the inner surfaces of the bridges, and of the cover-plates between the metallized areas may be silvered.
Patent GB-1240598-A (GB)
Title: Hydroxy-hydroperoxides and a process for the preparation thereof
IPC: C07C46/08
Filed: 1969-09-03
Abstract: 1,240,598. α - Hydroxy - hydroperoxides. SNAM PROGETTI S.p.A. 3 Sept., 1969 [5 Sept., 1968], No. 43701/69. Heading C2C. α - Hydroxy - hydroperoxides, containing a group of the formula  are prepared by reacting a compound having at least one ethylenic double bond with either (a) oxygen and an oxygen-carrier or (b) an oxidized oxygen-carrier, in the presence of a catalyst comprising an oxygen-containing metal compound. The oxygen carrier is preferably a hydroanthraquinone and the catalyst may be an oxygen-containing Mo, W, Se, Te, Co or V compound, e.g. In the examples isobutylene is converted to 2 - methyl - 2 - hydroperoxy - 1 - propanol in the presence of O 2 /2 - ethyl - hydroanthraquinone and MoO 2 [(CH3) 2 C(OH).CH 2 O] 2  and propylene, and allyl alcohol are treated likewise.