baber/WOPTO huggingface dataset:
Patent GB-551853-A (GB)
Title: Radio receivers
IPC: H03G5/26
Filed: 1941-06-09
Abstract: 551,853. Valve amplifying circuits. JOHNSON LABORATORIES, Inc. June 9, 1941, No. 7272. Convention date, June 22, 1940. [Class 40 (v)] In a high-frequency amplifier system comprising an amplifier valve, a resonant circuit connected to an electrode of. said valve, another valve regeneratively associated with said circuit and a variable bias system controlling said amplifier valve, at least part of the voltage developed in the variable bias system is applied to a control electrode of the regenerative valve. The Figure shows the invention applied to a radio receiver comprising two high-frequency stages 25, 26, detector and first audio-frequency stage 31 and power output 32. Each of the H.F. amplifiers feeds a tuned circuit 30 to which are regeneratively coupled auxiliary valves 28, 29 to reduce damping, A.V.C. potential developed across the load 68, 69 of the diode portion of 31 is applied to the grids of valves 25, 26 while a proportion of this voltage, that across 69, is applied to the grids of the auxiliary valves 28, 29 so as to maintain the selectivity constant with variations of input voltage. Variations of gain and selectivity are compensated by the resonant circuits 62, 63 in the cathode leads of the auxiliary valves. Specification 551,045 is referred to. The Specification as open to inspection under Sect. 91 also includes the following matter. Fig. 1 (Cancelled) (not shown), shows an arrangement of an amplifier and auxiliary reaction valve with no automatic bias system, but in which variation of selectivity with frequency is corrected by a resonant circuit in the cathode lead of the reaction valve. Figs. 3 and 4 (Cancelled) (not shown) show an arrangement in which a diodetriode is used for a reaction valve and supplies its own variable bias independent of the bias to the amplifiers. This subject-matter does not appear in the Specification as accepted.
Patent GB-398240-A (GB)
Title: Improvements in vacuum tube circuits for electrical signalling systems
IPC: H04L27/04
Filed: 1932-03-11
Abstract: 398,240. Valve circuits ; wireless transmitting-apparatus. STANDARD TELEPHONES & CABLES, Ltd., Connaught House, Aldwych, London.-(Assignees of MatÚriel TÚlÚphonique Soc. Anon. ; 46, Quai de Boulogne, Boulogne-sur-Seine, France.) March 11, 1932, No. 7286. Convention date, Aug. 31, 1931. [Class 40 (v).] A valve oscillator or amplifier is rendered inoperative, for keying in radio transmission or for like purposes, by first charging a condenser and then connecting the condenser in series with another source of biassing voltages in the grid or other circuit of the valve. As shown in Fig. 1, an amplifier T with input impedance R<1>F<1> and output impedance RF has a potentiometer 1 for biassing its grid and a source S1 for supplying its plate circuit. When the amplifier is operative, a condenser C is connected by a switch across a portion of the source S1, and the grid circuit is completed at a contact 6. To paralyze the valve, the switch is thrown over to the left so that the charged condenser C is connected in the grid circuit to assist the bias source 1, so raising the bias to a prohibitive value ; the contact 6 being simultaneously opened. A multi-contact relay operated electromagnetically by the key may be used for performing the switching operation, Fig. 2 (not shown).
Patent GB-213567-A (GB)
Title: Improved manufacture of condensation products from urea, or its derivatives, and formaldehyde
IPC: C08G12/12
Filed: 1924-03-21
Abstract: In the manufacture of condensation products from urea and its derivatives with formaldehyde, the first stage of the reaction, viz. the formation of the initial water-soluble intermediate products, is conducted in two phases, the first in the absence of free hydrogen ions and the second in the presence of free hydrogen ions whose concentration exceeds 10-7 but does not attain 10-3.  As regards the first phase, the absence of free hydrogen ions is secured either by adding a base to render the reaction mixture neutral or slightly alkaline or by using formaldehyde free from acid.  The second phase is effected by further heating with the addition of an acid, acid salt, acid ester, or a compound such as an ammonium salt which generates acid, or after formic acid has been produced, e.g. by aeration, from the formaldehyde present.  According to the concentration of the hydrogen ions present, different colloidal products are obtained.  When only small quantities of acid are present, a viscous hydrophile product is formed; with greater quantities of acid, a tough, resinous, hydrophobe gel is precipitated on cooling.  When, however, the hydrogen ion concentration exceeds 5 x 10-3, the reaction mixture sets to a brittle material which crumbles on drying.  The hydrophobe gel is very suitable not only for producing a hard final working material but also for the manufacture of lacquers.  For the production of hard materials, the hydrophobe gel is not necessarily separated, but the acid conditions are so chosen that the hydrophobe gel remains in pseudo-solution; in the case of lacquer manufacture, the hydrophobe gel may be dissolved in non-aqueous solvents such as epichlorhydrin to which non-aqueous softening agents may be added. According to the examples, urea and neutral or slightly alkaline formaldehyde are heated, and after short boiling, boric acid then added and the mixture further boiled; the viscous product, which comprises a hydrophile colloid, is poured into moulds and hardened by heat treatment.  If the reaction mixture be further heated after the formation of the hydrophile colloid, it separates on cooling into two layers, the tough lower layer of which, comprising a hydrophobe gel, is dried in vacuo and then hardened. Alternatively the whole of the reaction mixture in which the colloid has become hydrophobe is evaporated in vacuo and then hardened in moulds after the free acid and formaldehyde have been fixed.  In the above process, boric acid may be replaced by acetic-acid, ammonium acetate, benzoic acid, sulphuric acid, or even by formic acid produced by oxidation of a little of the free formaldehyde present. Specifications 151,016, 171,094, 187,605, and 201,906 are referred to.
Patent GB-918746-A (GB)
Title: Method and apparatus for coating strands
IPC: C03C25/18
Filed: 1961-02-28
Abstract: 918,746. Coating yarns. OWENS-CORNING FIBERGLAS CORPORATION. Feb. 28, 1961 [March 15, 1960], No. 7323/61. Class 140. A process for coating a strand 9, e.g. of glass fibres, or a wire, comprises applying a coating material 21 to the strand, passing the coated strand through a rotatable die 25, and rotating the die 25 whereby the coating material within the die 25 is rotated about the strand to impart a twist to the strand. The twist may be permanent or temporary. Coating material is pumped to a neck 23 for delivery on to a plate 19 over which the strand is drawn. The die 25 is carried by a spindle 50 mounted in bearings 51, 52 on a member 53 which is slidable vertically in a easing 58. Rotary motion is transmitted to the spindle 50 by a driven endless belt 61 which contacts a rubber bushing 60 on the spindle. Actuation of a lever 77 draws the member 53 upwards against a spring 75 to disengage the parts 60, 61, as desired, slots 54, 55 in the casing 58 permitting movement of the bearings 51, 52. The coated strand 28 is taken by an endless conveyer through an oven to a wind-up apparatus. In a modification, a hopper containing grains, flakes or short fibres of glass or other natural or synthetic material is located after the die 25 and the strand drawn therethrough and through a second stationary or rotatable die and, if desired, through a spraycoating device, e.g. for applying varnish or enamel, before the strand enters the oven, Fig. 5 (not shown). In another embodiment, Fig. 6, coating material 119 is delivered to a tube 117 having slots 118 through which strand 9 passes prior to traversing the die 25. In both embodiments, several coating apparatus and their associated dies 25 may be arranged sideby-side to deal with several parallel strands, the belt 61 driving all the dies 25. Coating materials mentioned are vinyls, polystyrenes, phenolformaldehyde, polyesters, polythenes, polyacrylates, polypropylenes, polyvinyl butyrals, cellulose derivatives, polyamides, oleoresinous enamels, and where a wire is to be coated, polyvinyl formal and cresol formaldehyde resins. The dies may be provided interiorly with vanes or grooves which augment the rotation of the coating material with a consequent decrease in its viscosity and an increase in its tendency to impart a twist to the strand. It is stated that coating material may be projected into the dies, the pre-coating step being omitted.
Patent GB-401940-A (GB)
Title: Improvements in and relating to electric generators for water power stations
IPC: F03B11/02
Filed: 1933-03-10
Abstract: 401,940. Driving and cooling dynamos. INTERNATIONAL GENERAL ELECTRIC CO., Inc., 120, Broadway, New York, U.S.A.- (Assignees of Allgemeine Elektricitõts-Ges.; 2, Friedrich Karl-Ufer, Berlin.) March 10, 1933, No. 7346. Convention date, March 10, 1932. [Class 35.] In a hydro-electric station having enclosed ventilated generators standing in the open, part of the generator casing 1 projects above the upper surface of the foundation 2 and in the projecting part openings 3 are provided for the escape of the used air. In the case of small machines, the protective shield of the generator may project sufficiently for to protect the openings against the entry of foreign material, but for larger machines a duct 5 made from plates or light stone work may be arranged spirally or concentrically around the generator. The upper surface 7 of the duct is formed in one with the protective shield 4. Openings 6 which can be closed by flaps permit outflow of the cooling air. An adjacent service room such as 8 may be warmed by supplying it through a connection 9 from the duct 5. Warm air can be supplied to the spaces surrounding the generator from a flap 10 in the generator case.
Patent GB-310093-A (GB)
Title: Improvements relating to brakes for vehicles
IPC: B60T13/74
Filed: 1927-12-20
Abstract: 310,093. Lomonossoff, GÀ V., and Kapitza, P. Dec. 20, 1927. Divided on 308,329. Hand - actuation ; applied by springs; compensating for wear; force - transmitting mechanism. - Power - operated vehicle brakes include in the transmission mechanism an adjustable device such as a turnbuckle by which the maximum brake pressure can be adjusted from the vehicle while in motion, the device having a range from the full-on to the full-off position. The system shown is that described in Specification 308,329 wherein the brakes are applied by springs and taken off by electromagnets. The springs 13 are attached to a fixed point 14 and to levers 8 pivoted at 9 and connected by a link 11, 24 to a brake-shoe beam 25. The levers 8 are connected also to the armatures 2 of electromagnets 1 which when energized hold the brake-shoes 26 off the wheels 30 against the action of the springs. The link parts 11, 24 are connected by a toothed turnbuckle 17 which can be turned to adjust the effective length of the link by a pinion 19 on a shaft 20 adapted to be rotated either from outside or inside the body of the vehicle by handles on the shafts 22, 28. By this means when the magnets are de-energized so that the shoes are normally applied to the wheels by the springs, the tension of the springs may be adjusted to any value from the maximum to zero or the effort of the springs may be taken off the shoes by a suitably-positioned stop before the tension has been completely relaxed. The brakes may also be applied by the adjusting- device when the magnets are energized and adjustment may also be made by the device to compensate for the wear of the shoes.
Patent GB-1420529-A (GB)
Title: Compositions for oral hygiene
IPC: C12N9/26
Filed: 1974-02-19
Abstract: 1420529 Oral compositions containing enzymes SANKYO CO Ltd 19 Feb 1974 [26 Feb 1973] 7548/74 Heading A5B A composition for oral or dental use comprises at least one fructan-degrading enzyme and an edible solid excipient, a dental detergent, an antiseptic, an emollient, a demulcent, or a chewing-gum base. The composition may be in the form of a tooth-powder, tooth-paste, mouth-wash, gargle, dental ointment or lotion, tablet, troche, pastille or chewing gum. Edible compositions comprise at least one fructandegrading enzyme and a foodstuff or beverage. The fructan-degrading enzyme may be derived from a micro-organism of the genus Talaromyces, Eupenicillium, Sporotrichum, Sordaria, Chaetomium, Gelasinospora, Stachybotris, Actinomyces, Aspergillus, Fusarium, Humicola, Penicillium, Arthrobacter, Streptococcus or Streptomyces. The composition may additionally comprise a dextranase, amylase, protease and/or lipase.
Patent GB-449821-A (GB)
Title: Improvements in or relating control systems for electrically propelled vehicles
IPC: H02P5/685
Filed: 1935-03-11
Abstract: 449,821. Control of series D.C. motors. WESTINGHOUSE ELECTRIC & MANUFACTURING CO., East Pittsburg, U.S.A.- (Assignees of Kimball, R. L. ; 3945, Connecticut Avenue, Washington, U.S.A., and Monro, D. J. : 135, Hillcrest Avenue, Montreal. Canada) March 11, 1935, No. 7574. Convention date, March 15, 1934. [Class 38 (iii)] In a control system for traction motors, a relay responsive to increased back E.M.F. is provided to shunt a motor field winding when slipping of the driving axle occurs, and the shunt is removed gradually when the slipping condition has been corrected. In the form shown, the coils 37, 38 of the balanced relay 26 are connected across the armatures 12, 14 respectively so that a back E.M.F. increase in the case of one motor causes the field winding 13 or 15 to be shunted by resistance 78 or 89. The field is then also shunted by inductive resistances 31 or 32 which is not rendered ineffective until the delayed action relay 35 or 36 has operated. A drum controller 25 and relays 21-24 are provided for reversing.
Patent GB-1097515-A (GB)
Title: Concrete composition
IPC: C05B7/00
Filed: 1965-02-22
Abstract: A composition for making concrete which does not need plastering and may be painted or papered directly comprises a binder such as lime or cement and fine and coarse aggregates in proportion at least 45% by volume fine and at most 55% coarse, the fine aggregate consisting of granulated blast-furnace slag and/or direct process slag and/or boiler smelter-slag and/or similar slags of vitreous substance having a maximum grain size of 8 mm. and containing a total fine proportion of particles having a grain size less than 0.2 mm. in an amount 12-50% by weight of the slag, and the coarse aggregate consisting of Leca, swelling clay, sintered flue dust or smelter-slag pumice.
Patent GB-821969-A (GB)
Title: Improvements in chucks for machine tools
Inventor: RICHARDS STANLEY
IPC: B23B31/32
Filed: 1957-03-07
Abstract: 821,969. Chucks. INTEGRAL Ltd. March 14, 1958 [March 7, 1957; Jan. 8, 1958], Nos. 7636/57 and 787/58. Class 83 (3). In a chuck two diaphragms 13, 15 are spaced apart and fixed at their peripheries to a body 10; the diaphragm 15 has an extension 17 engaging the diaphragm 13 which carries jaws 14. Diaphragm 15 is distorted; to open the jaws by compression of fluid contained in chambers 18, 25. The compression may be by an axial piston 21, Fig. 4, and a push-rod 29, or a number of radial pistons 21, Fig. 1, moved radially by rotation of a scroll 23, retained by a plate 22. The chuck may be attached to a machine tool spindle by screwing at 28<SP>1</SP>, Fig. 4, or by an adaptor having screws engaging tapped holes 11, Fig. 1.
Patent GB-1514011-A (GB)
Title: Strapping tools
IPC: B25B25/00
Filed: 1976-02-26
Abstract: 1514011 Strapping tools SIGNODE CORP 26 Feb 1976 [7 March 1975] 07645/76 Heading F2G A tool for tensioning a strap 30 around a package and for cutting off excess strap comprises a frame 11 having an upright portion 12 in which is mounted a pivot shaft 14, a tensioning assembly 16 being mounted thereon and including a reversible air motor 18 driving a knurled tensioning wheel 26 in the direction of arrow A to pull the upper overlapping strap portion 34 through a seal 38 whilst the lower strap portion 36 is held against a gripping block 39, a ratchet wheel 40 driven with the wheel 26 and a pawl 42 pivotally mounted on a pin 44 and engageable with the ratchet wheel 40 when rotated by the motor 18 in a direction opposite to the tensioning direction (arrow B) to actuate a cutter blade 80 to cut off the excess of the strap portion 34.
Patent GB-1294121-A (GB)
Title: Friction dusts from cashew nut shell oil
Inventor: JEFFREYS KERRY DAVID
IPC: F16D69/02
Filed: 1969-02-13
Abstract: 1294121 Aryl borate-aldehyde resins; compositions BP CHEMICALS Ltd 4 Feb 1970 [13 Feb 1969] 7826/69 Heading C3R Resin powders suitable for use in making friction elements are produced by (a) reacting an aldehyde with a borate of a phenolic component comprising at least 5% of cashew nut shell liquid and (b) grinding the resin product. The balance of the phenolic component may comprise other phenols such as phenol itself, cresols, xylenols and dihydroxybenzenes. The aldehyde may be formaldehyde. The resin is usually condensed to an infusible state. In examples the borate is prepared from phenol, cashew nut shell liquid and boric acid in the presence of toluene. The product is reacted with paraformaldehyde and the resin so produced compounded with asbestos and barytes to make friction elements.
Patent GB-608292-A (GB)
Title: Improvements in treatment of cotton fibres
IPC: D06M11/38
Filed: 1946-03-15
Abstract: The tensile strength of stranded cotton fibres (as defined below) is improved by subjecting the fibres to successive contact with two liquids, one being an aqueous bath capable of swelling the cellulose, the other an organic liquid capable of dissolving cotton waxes, the solvent treatment being carried out at a temperature substantially above 25 DEG  C., preferably not lower than 50 DEG  C., but not in excess of 150 DEG  C.  The expression " stranded cotton fibres " is applied to cord, yarn, thread, plied yarn, string and the like.  The process is preferentially applied to grey cotton cord &c., containing substantially all the natural cotton waxes (i.e. non-cellulosic water-insoluble compounds extremely soluble in hot ethyl alcohol) but it may be applied to cotton cord from which the non-cellulosic constituents have been p  extracted, with however, a diminished increase in tensile strength.  The baths may be used in any order, and the material to be treated may be processed continuously or batchwise.  Tension, not exceeding 40 per cent of the breaking stress, should be applied during the processing and drying if the continuous method is used.  Batchwise treatment on spools may require a higher tension.  Suitable fixed alkalis for the aqueous bath are sodium hydroxide, sodium carbonate, and trisodium phosphate at concentrations of 0.1 to 2.0 per cent, higher concentrations producing tendering.  This is completely avoided if volatile bases such as ammonia and ethylene diamine are employed.  The times of treatment should be from 5 minutes to 2 hours or longer, according to the temperature of the solution, but not long enough to degrade or to alter the final softness of the yarn.  The time of treatment in the non-aqueous bath ranges from 5 minutes to 2 hours.  It is advantageous to leave a substantial proportion of the natural waxes in the fibre.  Suitable solvents boil in the range 100 DEG  C. to 180 DEG  C., and are compounds such as amyl, butyl, isobutyl and propyl acetates, toluene, xylene, trichloroethylene, pyridine, butanol, solvent naphtha, petroleum ether, amyl alcohol, cyclohexane, butyl ethyl ketone, diethyl ketone, diacetone alcohol, morpholine, dioxane &c.  The yarn or cord may be treated so that the products have high-tensile strength and low stretch or a less increased tensile strength and greater stretch.  The treated yarns may be rubberized as in the manufacture of type carcasses, or used in the manufacture of sewing threads and the like.  Numerous examples are given, illustrating the effect of different bases, different solvents, different treatment times, different aqueous bath temperature, different tensions, single bath treatment, and to show that the order in which the baths are used is immaterial, that the effect of treating in both baths is greater than the sum of the effects obtaining by treating in the aqueous bath alone and in the organic solvent alone.
Patent GB-622442-A (GB)
Title: Improvements relating to electrolytic condensers
IPC: H01G9/12
Filed: 1947-03-26
Abstract: 622,442. Electrolytic condensers. FERRANTI, Ltd., and BODEN, P. March 26, 1947, No. 8179. [Class 37] An electrolytic condenser 1 is housed in a container 2 having one or more seals each comprising a layer 3 of rigid material stuck to a layer 4 of elastic material and disposed between one or more inwardly-directed protuberances 9 and the spun or bent-over edge 10 of the container, the layer of rigid material being divided into two or more portions, each bounded at least partly by the periphery of the layer so that an excessive pressure of gas within the container causes a non-peripheral edge 8 of one portion 11 to be displaced outwardly, thereby loosening the seal between the rim and this portion and allowing the escape of gas. A second layer of elastic material, which may be neoprene, may be stuck to the other side of the rigid layer, which may be of synthetic resin paper board or of metal. For a circular-shaped seal the height of the segment-shaped portion 11 is preferably one-third of the radius. The seals may also be of square or other shape with rectangular-. shaped portions.
Patent GB-550332-A (GB)
Title: Improvements in or relating to transfer copying materials
IPC: B41M5/10
Filed: 1941-06-30
Abstract: 550,332. Coated paper. GROAK, J. June 30, 1941, No. 8242. [Class 96] [Also in Group XVI] A set of transfer copying papers comprises at least one copy sheet carrying a colouring matter in an undissolved and dispersed condition, and at least one transfer sheet carrying a substance which, when transferred due to writing pressure brings the colouring matter into a dissolved condition exhibiting a colouration which contrasts with the unimpressed surface of the copy sheet. The colouring matter may be fat, oil or watersoluble dyestuff or dye base and may be applied as a dispersion in a non-solvent vehicle containing a binding agent such as casein, shellac or dextrin, or may be incorporated in the pulp from which the copy sheet is made. A pigment, e.g. titanium white, to mask the colour of the dye may be incorporated with the dye or may be applied as a coating over the treated copying paper. With fat- or oil-soluble dyestuffs, may be used volatile alcohols or esters thereof, waxes, fatty acids, esters of phthalic acid, phosphoric acid, or other organic or inorganic acids &c. For a water-soluble dyestuff, the transfer sheet may be coated with wax having a hygroscopic substance such as glycerine emulsified therewith. Starch grains may be incorporated also with the wax and glycerine coating as described in Specification 503,695, [Group XVI]. The transfer sheet may be a separate sheet interposed between the original and the copy sheet. The copy sheet may contain differently coloured areas or two or more different colours may be superposed; it may have a colour-bearing coating on one side and a solvent-bearing coating on the other. The paper may be impregnated or coated with a solvent-repellant e.g. casein. The coatings on either or both kinds of sheets may be protected by a film. of paraffin wax. Specification 525,042, [Group IV], also is referred to.