baber/WOPTO huggingface dataset:
Patent GB-657239-A (GB)
Title: Superregenerative amplifier
IPC: H03D11/02
Filed: 1949-02-28
Abstract: 657,239. Super - regenerative receivers. HAZELTINE CORPORATION. Feb. 28, 1949, No. 5422. Convention date, March 16, 1948. [Class 40 (v)] The quench-waveform in a super-regenerative amplifier is such that the conductance characteristic of the oscillatory circuit has a linear portion extending from a positive value to a negative value, the zero conductance point occurring within the first two-thirds of the quench waveform reckoned from the point at which the signal frequency oscillations begin to decay and substantially all of the superregenerative gain occurring during the linear conductance variation. It is explained that the shape of the peak and skirts of the selectivity characteristic are controlled respectively by the slope of the conductance characteristic in the vicinity of zero conductance and the slope of the adjacent portions of the characteristic and that for a given gain or peak value of negative conductance the slope of the conductance characteristic may be made smaller if it intercepts the zero axis earlier. The oscillatory circuit 36, 37, 38 to which the signal is fed from source 80 is connected to a valve 35 to form a Colpitts oscillator and a quench wave is fed to the grid from a class C oscillator 60, the anode current pulses of which produce saw-tooth waves across an integrating circuit 66, 67 and voltage pulses across resistor 68 and capacitor 69. The combined quench wave is fed to the grid of valve 35 and the voltage pulses are used to render conducting a peak rectifier damping circuit 75, 77, 78 connected across the oscillatory circuit to produce more rapid quenching as indicated between t 3  and t 4  of the conductance characteristic shown. The output from the oscillatory circuit is demodulated by a diode 41 which also serves as an oscillation amplitude limiter and stabilizes the gain by providing a bias voltage which is fed through resistor 51 to the grid of valve 35. The amount of additional damping provided by the diode 75 is controlled by the load resistor 78 and the conductance is controlled by a resistor 39 across the oscillatory circuit. For F.M. reception this circuit is tuned slightly away from the signal. In an alternative self-quenching circuit the saw-tooth quenching wave is generated at the grid by a resistance capacitance circuit connected to H.T. through an additional D.C. circuit of the type disclosed in Specification 646,331, which stabilizes the mean quench repetition frequency. In this embodiment the zero conductivity point occurs just after the middle of the quench period. The circuits may operate in the saturation or linear modes. Specification 663,473 also is referred to.
Patent GB-461777-A (GB)
Title: Improvements in vaporizers for internal combustion engines
IPC: F02M21/10
Filed: 1936-02-24
Abstract: 461,777. Vaporizers. STAACK, C. Feb. 24, 1936, No. 6471. [Class 7 (iii)] The mixture inlet and outlet pipes e, g of a tubular casing a, through the tubes d of which the exhaust gases pass, are offset, the outlet pipe being displaced in the direction of the flow of the exhaust gases so that the mixture brushes along the tubes, the complete evaporation being assisted by sieve-like atomizer plates h fitted in the inlet and outlet pipes. The tubes may be undulating and may narrow in the direction of flow of the exhaust gases.
Patent GB-515141-A (GB)
Title: Process for the production of butanol-1-one-3
IPC: C07C49/17
Filed: 1938-02-22
Abstract: 515,141. Butanol-1-one-3 CONSORTIUM FUR ELEKTROCHEMISCHE INDUSTRIE GES. Feb. 22, 1938, No. 5485. Convention date, Feb. 24, 1937. [Class 2(iii)] Butanol-1-one-3 is prepared by the addition of water to butene-1-one-3, in the presence of acids, or to vinyl acetylene, in the presence of acids and mercury sulphate or other compounds known to be effective in the hydration of acetylene, and isolated from the reaction solution under accurately neutral conditions. #.#<1>-diketobutylether is a by-product in both reactions. In examples (1) vinyl acetylene is passed into a solution of mercuric oxide in dilute sulphuric acid, the acid is neutralised and the products, comprising butanol-1-one-3, butene-1-one-3 and #,#<1>diketobutylether, are distilled off in vacuo ; (2) butene-1-one-3 is allowed to stand with N-sulphuric acid for a day, the acid is exactly neutralized, and the same mixture of products as obtained in (1) is distilled off. Specifications 9358/10, 17193/13, [both in Class 2 (iii)], and 388,402 are referred to.
Patent GB-712183-A (GB)
Title: Negative feedback and tone control in audio frequency amplifiers
IPC: H03G5/08
Filed: 1951-03-07
Abstract: 712,183. Valve amplifying circuits. COLE, Ltd., E. K., and BURNARD, C. L. March 6, 1952 [March 7, 1951], No. 5496/51. Class 40 (6) Tone control in an audio frequency amplifier is effected by two parallel negative feedback paths between the cathode of the output valve and the grid of a previous valve, both paths comprising reactive and resistive elements and a point between elements in one path being connected to earth. The amplifier shown comprises a first negative feedback path R1, C1 mainly controlling the lower frequencies and a second comprising C3, part of R4 and C2 mainly controlling higher frequencies one end of R4 being connected to earth. When the slider M is in its lowest position the lower path is ineffective but C2 byepasses the higher frequencies from the upper path and high frequency boost is thus obtained. When the slider is in the upper position both feedback paths are effective and a high frequency cut is obtained. A small capacitor C4 increases the high frequency feedback when the volume control is in the full volume position thus providing some tone compensation for the volume control. The H.T. is supplied through a tap on the output transformer winding to reduce the magnetization of the core. Specification 524,690 is referred to.
Patent GB-608420-A (GB)
Title: Improvements in film drive mechanism for sound film apparatus
IPC: G03B31/02
Filed: 1946-02-22
Abstract: 608,420. Sound film apparatus. WESTERN ELECTRIC CO., Inc. Feb. 22, 1946, No. 5626. Convention date, June 26, 1945. [Class 97 (i)] The film is driven by a sprocket and a damping roller is associated with the film to reduce irregularities in its speed produced by the sprocket, the damping roller being carried on a lever urged by a coil spring and damped by a dashpot. As shown two rollers 20 each consist of the outer race of a ball bearing on a spindle 21 on an arm 22 pivoted to a base 23. The base has two bosses, each split and provided with screws, one of which is indicated at 48, to clamp pivot pins, one shown in section at 24, engaging ball bearings carried in the arm 22. A pin 62 projects downwardly from the arm and carried one end of the spring 25. The tension is adjustable by a nut 64. The dashpot comprises a plunger 57 on the arm and a cup 26 on the base. An inverted cup 52 on the arm closes the cup 26. The sound drum of the associated apparatus has a flywheel rotating near damping magnets.
Patent GB-446549-A (GB)
Title: Improvements in or relating to electric insulators for use on very high radio frequencies
IPC: H01B11/18
Filed: 1935-02-21
Abstract: 446,549. Electric cables; insulators. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Electra House, Victoria Embankment, London, and EWEN, H. A., Gray Walls, Priest Lane, Shenfield, Essex. Feb. 21, 1935, No. 5635. [Class 36] A radio frequency insulator comprises two dished mica discs 5, clamped together at their outer peripheries by a metal ring of X- section or, as shown, by an L- sectioned ring 2 into which a washer 3 is screwed or pressed, and held in spaced relationship at their inner peripheries by shoulders 1<a> on a metal member 1 and coacting washers 6, 7, screwed or pressed thereon. The inner and outer metal members, 1 2, are suitably formed for attachment to the devices which are to be insulated. For example, the inner member 1 may be bored axially to house a conductor secured thereto by a grub screw, and the outer member of X-section may be grooved to locate wires running parallel to the bore in the inner member 1. The insulators are particularly applicable to concentric cables. Fig. 3 shows such a cable, comprising a conductor A on which the insulators B are threaded and outer conductors C spaced by the insulators and covered by a lead or other sheath D. The conductors C may be straight or twisted. In a modification the outer conductor comprises a tube of metal gauze.
Patent GB-539473-A (GB)
Title: Electric firelighting apparatus
IPC: F23Q7/02
Filed: 1940-03-29
Abstract: 539,473. Electric firelighters. LORCH, W., and ELGA PRODUCTS, Ltd. March 29, 1940, No. 5697. Addition to 533,742. [Class 39 (iii)] In an electric fire-lighter as described in the parent Specification, excessive heating at the inside bends of the heating element is avoided by increasing the pitch of the helically wound resistance wire 4 at the bends. The coiled wire is pulled out at the necessary points before inserting it in the tube together with magnesium strips which are converted into magnesium oxide as described in Specifications 336,949, [Class 39 (iii)], and 462,280. The tube is then bent into shape. The helix at the bends may be pulled out until it almost disappears. The tube is prevented from coming into direct contact with the fuel by a covering grid or grille of "Inconel" metal (Registered Trade Mark) extending over the whole tube or only over the bends.
Patent GB-1114980-A (GB)
Title: Magnetic reproducing system
IPC: G11B27/22
Filed: 1966-02-09
Abstract: 1,114,980. Controlling tape-recorders. SONY CORPORATION. 9 Feb., 1966 [9 Feb., 1965 (2)], No. 5734/66. Heading G5R. A reversible magnetic tape 2 is driven by a motor (5), Fig. 1 (not shown), from a reel (1a) to a reel (1b) in the direction of arrow A and signals S 1  are recorded on one magnetic track T 1  and/or played back by a magnetic head 3a. On reversing the drive of motor (5) tape 2 is transported in the direction of arrow B and signals S 2  are recorded on track T 2  and/or played back by head 3b. The reversal of motor (5) is controlled by a circuit, Fig. 3, comprising a mixing circuit 10 to which signals S 1'  S 2  are applied, the resulting signal S 3  being detected by a circuit 7. When no signal is applied to circuit 7 for a certain period of time t 3  exceeding short pause periods t 1 , t 2  of the signals, the operative condition of a bi-stable multivibrator circuit 8 is altered from one state to the other and by means of a relay 9 the drive of motor (5) is reversed.
Patent GB-1314308-A (GB)
Title: Rotary wing system
IPC: B64C27/473
Filed: 1972-02-08
Abstract: 1314308 Helicopter rotors UNITED AIRCRAFT CORP 8 Feb 1972 [8 April 1971] 5751/72 Heading B7W A helicopter rotor comprises a rotor shaft 22 which carries a plate 26 formed with a diametral slot 38 and a filling piece 28 to engage therein and clamp a rectangular section spar 20, the opposed faces of the slot and piece 28 being so cambered as to deflect, when clamped, the spar into a coning angle α. An upper plate 32 and filler piece 30 when bolted into engagement with plate 26 clamp in a similar manner a further spar at right angles to the first. Each blade has an aerofoil shell flared at its root end as shown in Fig. 2 to surround in spaced relationship therewith the spar 20 and formed over its outboard portion 46 up to the tip with honeycomb filler 47 which is bonded to the spar. The spar is composed of a plurality of thin layers of high modulus filaments in side-by-side relationship parallel to the longitudinal axis of the spar and bonded with, e.g. an epoxy resin, the filaments having a modulus of elasticity of at least 2, 11 x 10<SP>6</SP> kg./cm.<SP>2</SP> and the whole spar having a bending to shear modulus ratio of at least 15/1. The shell is constructed in the same manner as the spar, but the filaments are so oriented as to provide a bending to shear modulus ratio of from 2/10-10/7. Flapping and pitch charge movements are applied by bending and twisting respectively of the spar.
Patent GB-431163-A (GB)
Title: Food safes
IPC: A47B71/00
Filed: 1934-02-21
Abstract: 431,163. Meat safes. BROADBEAR, S., 92, Audley Street, Reading. Feb. 21, 1934, No. 5759. [Class 28 (ii)] A bottomless food safe 2 is positioned on the top of a food safe 1 by corner pieces 12, so that the top of the safe 1 forms the bottom of the safe 2. Another bottomless safe may be positioned on the safe 2 and so on. The walls and doors of the safes are of known sheet metal and perforated metal or gauze construction. The doors are pivoted on horizontal hinges to swing downwards. According to the Provisional Specification, the doors may be pivoted to swing upwards or may be mounted on vertical pivots.
Patent GB-393552-A (GB)
Title: Improvements in and relating to elastic fluid turbines
IPC: F22B37/28
Filed: 1933-02-25
Abstract: 393,552. Steam turbines. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Doran, J. H. ; 242, Ballston Avenue, Scotia, New York, U.S.A.) Feb. 25, 1933, No. 5808. Convention date, Feb. 25, 1932. [Class 110 (iii).] In a multistage turbine, a curved pipe 9 between the stages is fitted with a trap 11 in which water of condensation collects, and from which it may be removed by a pipe 13.
Patent GB-349097-A (GB)
Title: Process for the production of 1.1.2-trichlorethane
IPC: C07C19/05
Filed: 1930-02-21
Abstract: 1.1.2-Trichlorethane is obtained by treating acetylene with hydrogen chloride in presence of catalysts, and thereafter subjecting the resultant reaction mixture containing vinyl chloride to the action of chlorine in a separate operation.  In producing the vinyl chloride acetylene and hydrogen chloride may be passed through hot tubes over catalysts consisting of porous inert carriers charged with salts such as mercury halides or with acidic or basic oxides.  Active charcoal with or without the addition of metallic salts such as mercuric chloride may also be used as a catalyst.  Either aqueous hydrochloric acid or hydrogen chloride may be employed.  The chlorination step may be carried out as described in Specification 298,084, [Class 2 (iii), Dyes &c.], advantageously in presence of a solvent, for example, 1.1.2-trichlorethane itself, containing a catalyst.  The solvent may also be irradiated.  As a catalyst, iron turnings contained in a tower sprinkled with trichlorethane, or in a vessel containing trichlorethane and provided with stirrers, may be employed.  The amount of chlorine added in the chlorination step should preferably not exceed that corresponding to the amount of vinyl chloride present; if excess is used, acetylene chlorination products may be formed, which may be separated from the product by fractional distillation.  The gases leaving the chlorination apparatus are conducted first to an apparatus for condensing any trichlorethane carried over.  The effluent gases may then be led to a second apparatus for producing trichlorethane, or may be returned in circulation by means of a pump to the apparatus for producing vinyl chloride, the requisite additions of acetylene and hydrogen chloride being made, and a portion of the circulating gas allowed to escape through a suitably placed water seal.  The velocity of the reaction can be increased by admitting larger quantities of either acetylene or hydrogen chloride, or may be moderated by allowing the inert gases present in the circulating current to accumulate.
Patent GB-490858-A (GB)
Title: Device for trueing curved working surfaces of grinding discs for the grinding of toothed wheels
IPC: B23F23/12
Filed: 1937-02-26
Abstract: 490,858. Shaping grinding discs. ZAHNRADFABRIK FRIEDRICHSHAFEN AKT.-GES. Feb. 26, 1937, No. 5893. Convention date, March 9, 1936. [Class 124] A device for trueing the curved working surface of grinding-discs by a tool moving over a curve reduced from a template to anv desired scale. The trueing tool 13 is adjustably secured along a bridge-piece 47, one end of which is pivoted on the slide 43 and the other is guided over the template 46. The slides 43, 45 can he adjusted to allow for wheels of different diameters. The linkage 5, 6, 7 maintains the trueing tool perpendicular to the surface of the wheel. The device is secured between pivots 32, 33 normally used to receive the gear-wheel to be ground. In a modification, the pivot of the bridge-piece is situated on the line of centres of the pivots 32, 33.
Patent GB-1484269-A (GB)
Title: Photographic silver complex diffusion transfer processing liquid
IPC: G03C8/06
Filed: 1974-02-08
Abstract: 1484269 Photographic silver complex diffusion transfer processing liquid AGFAGEVAERT 7 Feb 1975 [8 Feb 1974] 05946/74 Heading G2C  An alkaline aqueous liquid contains a silver halide solvent, preferably a thiosulphate, and at least one compound of the Formula:-  MOOC-X-COOM where X is -CH=CH, and M is an alkali metal. The compound may be added to the liquid as maleic acid, phthalic acid, 3,4-dicarboxypyridine or pyromellitic acid. The pH of the liquid is preferably 12À5-13À1 and may be brought to within that range by NaOH or LiOH. The temperature of the liquid may be 18-28C. The liquid is used to transfer silver complexes from an imagewise exposed light-sensitive silver halide material to an image-receiving material comprising an aluminium sheet or foil or support aluminium layer which is used as a planographic printing plate. Exhaustion of the liquid used in such a process is reduced by the presence of the compound defined above.
Patent GB-753741-A (GB)
Title: Process for the production of organic isocyanates
Filed: 1954-03-02
Abstract: Organic isocyanates are prepared by the reaction between a carbonyl halide and a primary organic monoamine or polyamine and/or carbamyl halide in the presence of boron trifluoride or a complex thereof yielding boron trifluoride under the reaction conditions without generating a compound with which the isocyanate reacts.  The process is applicable to the preparation of alkyl-, cycloalkyl-, aralkyl-, aryl-, alkaryl- and hydroaryl mono- and polyisocyanates.  From 0.5 to 3 per cent of boron trifluoride is preferably employed, based upon the weight of the primary amine, and this may be added in the form of a complex with diethyl ether, acetone, pyridine, dimethylaniline, ethyl acetate or anisole.  The reaction is preferably conducted at 70-120 DEG  C. in an inert organic liquid, preferably one boiling below 200 DEG  C at atmospheric pressure, e.g. benzene, toluene, xylene, cymene, cyclohexane, monochloro-, dichloro- and amyl-benzene, carbon tetrachloride, tetrachloroethane, trichloro- and tetrachloroethylene.  The primary amine hydrohalide and/or carbamyl halide is preferably produced in situ by treating a solution or slurry of the corresponding primary amine in an organic liquid with phosgene, carbonyl bromide or a halogen halide.  After subsequent conversion to isocyanate the reaction mixture may be degassed and/or fractionally distilled.  The examples describe the preparation of p:p1-diisocyanatodiphenylmethane.
Patent GB-318113-A (GB)
Title: Improvements in or relating to extrusion presses
IPC: B21C23/21
Filed: 1928-02-27
Abstract: 318,113. Kreidler, A. Feb. 27, 1928. Extrusion-machines.-An extrusion press is provided with movable dies so that while one is in action the other may be prepared for the next operation. Two or more dies F<1>, F<2>, Fig. 2, may be arranged on a rotating or sliding member adjacent one or more fixed billet containers A<1> each with its plunger D or adjacent two or more billet containers A<1>, A<2>, Fig. 3, carried by a rotating member. The billet may be forced through the die by a plunger as shown in Fig. 2, or a piston C may move the container A<1> over one of the plungers E', E<2> in which the dies F<1>, F<2> are mounted. During this movement a stationary scraper G cleans the container A<2>. The piston C then withdraws the containers by means of a fork H, a fresh billet B<2> being forced into the container A<2> by a stop K. During the rotation of the die carrier the extruded material is severed by a fixed cutter M and the residue behind the die is scraped off by the container. In another modification a die carrier 15, Fig. 1, is arranged to be rotated by a motor 16 which, with the plunger D, is controlled by finger 30 coming into contact with studs' 32 on a disc 31. The cycle of operations is commenced with the carrier at right angles to the position shown so that a billet can be introduced into the container 13. The motor is then started manually and when it has rotated the carrier through 90‹ one of four projections 19 oscillates a lever 20 which, acting through a pawl 23, ratchet 26, and shaft 29, moves the arm 30 on to the next stud 32 so disengaging the motor 16 and starting the plunger D. An arm 35 on the plunger carries a double wedge 87 which at each end of the stroke oscillates one of the levers 39, 42 which acts, like the lever 20, to move the arm 30 on one stud. When the extrusion stroke is finished the movement of the arm 30 causes the plunger D to be returned and the motor 16 to rotate the carrier 15 through 90‹ The next projection 19 then moves the arm 30 causing the motor to be disengaged so that a new billet can be inserted and the operations repeated.
Patent GB-777000-A (GB)
Title: Boron nitride materials and shapes
IPC: C04B35/583
Filed: 1955-03-02
Abstract: In the production of hot pressed boron nitride by heating boric acid or oxide in admixture with a diluent such as calcium phosphate at a temperature of 800-1100 DEG C. in an atmosphere of ammonia, washing with mineral acid and then moulding under pressure at a temperature above 1400 DEG C., the boron nitride obtained after washing with mineral acid is heated to a temperature above 1100 DEG C., e.g. 1200-1500 DEG C. in an atmosphere of ammonia before hot pressing. Instead of calcium phosphate or the like, previously formed boron nitride may be employed, in which case an extraction with mineral acid is unnecessary.  The combined B2O3 content of the boron nitride (i.e. the content convertible to free B2O3 during the hot pressing step) may thereby be reduced from 15-20 per cent to at least 7 per cent, desirably to 2-5 per cent.  Heating is preferably carried out under such conditions that the product can be hot-pressed to form a body having a density of not less than 1.9 gm./c.c., more preferably 2.1.  Granular boron nitride having a low combined B2O3 content of 2-5 per cent and a maximum particle size of 1.0 micron and an average particle size of 0.1-0.2 is produced as an intermediate product for hot pressing by heating boron nitride having a combined boric oxide content of 15-20 per cent in ammonia at 1300 DEG C. for 8 hours.  If this product is hot-pressed at 1800 DEG C. at 2000 p.s.i., a moulded body of apparent density, 2.1 free B2O3 content of 4.5 per cent, and sand blast penetration of 0.008 in. is produced. Hot pressing may also be carried out above 1800 DEG C., e.g. up to 2100 DEG C., at which temperature and a time of 1 1/2 hours, a moulded body of apparent density 2.04, a free B2O3 content of 1.67 per cent, and a sand blast penetration of 0.025 in. is produced.  The boron nitride of low B2O3 content may be admixed with boron nitride of high B2O3 content before hot pressing.  The proportions of low and high B2O3 content boron nitride may be from 70 : 30 to 90 : 10.  Specification 742,326 is referred to.
Patent GB-228025-A (GB)
Title: Drying-tunnel or apparatus
IPC: F26B15/12
Filed: 1924-03-11
Abstract: 228,025. Haas, H. March 11, 1924. Air, controlling direction of flow of.-An openended drying-tunnel of the kind in which the goods are conveyed therethrough upon endless chains &c. comprises compartments a - - e having adjacent air-heating chambers h<2> which overlap the compartments, and fans v<1> - - v<5> for circulating the air through the compartments and the heating-chambers, the fans v<2> discharging a portion of the moisture-laden air from the compartments a, b to the atmosphere. Specification 173,234 is referred to.