baber/WOPTO huggingface dataset:
Patent GB-791916-A (GB)
Title: Improved method of extracting copper values from material containing copper
Inventor: FORWARD FRANK ARTHUR
IPC: C22B15/00
Filed: 1954-09-14
Abstract: Finely pulverized copper-bearing mineral sulphides are leached in an agitated aqueous ammonia solution at above 80 DEG  F. and atmospheric pressure into which a free oxygen-bearing gas (such as oxygen with or without an inert gas, oxygen enriched air or air) is passed so as to maintain a partial pressure of oxygen above 5 lbs./sq. inch and thereby solubilize the copper and some other meal values and form polythionates and/or thiosulphates; the solution after removal of insoluble residues is oxidized to ammonium sulphate or sulphamate; the free ammonia content is reduced, e.g. by heating the solution; and metallic copper is precipitated at elevated temperature and pressure with a sulphur-free reducing gas such as hydrogen at above 300 DEG  F. and at between 50 and 500 lbs./sq. inch, or carbon monoxide.  The leach solution contains sufficient free ammonia to convert copper values to and dissolve them as copper amines, 60-100 gms./litre being satisfactory. Subsequently remaining copper and other metal values such as zinc, nickel, cobalt and cadmium may be precipitated with hydrogen sulphide and returned if desired to the leaching step and crystalline ammonium sulphate may be recovered from the leach solution and a portion can be returned to the leaching stage; alternatively it can be regenerated for recovery of ammonia. Uncombined ammonia can be removed from the leach solution by heating and recovered for re-use.  It is desirable to reduce the ammonia content of the solution until a molecular ratio NH3/Cu of about 2.5/1 is reached, whilst maintaining a concentration of about 200 to 400 grams per litre of ammonium sulphate in the solution: sulphuric acid may then be added to reduce the ratio to about 2 : 1 and the copper precipitated as indicated above.  Preferred features are the use in the leaching stage of particles from 35 to 325 (Tyler) screen size; 15 to 50 per cent solids by weight of the solution; temperatures of 100 DEG  to 300 DEG  F.-supplemental heat to that generated autogenously may if necessary be supplied, or cooling coils may be employed; partial pressures of oxygen of 20 to 150 lbs. per sq. inch; generally 96 to 99 per cent of the copper should be extracted in 4 to 11 or 12 hours by these means.  If an inert gas is used with the oxygen, a constant withdrawal of gas should be maintained and ammonia recovered therefrom.  Counter-or con-current leaching may be employed, using a plurality, e.g. two, stages.  An example of the leaching stage refers to a nickel/copper/iron sulphide ore of which copper and nickel are dissolved whilst iron remains in the residue as ferric oxide or hydrate.  If present in the sulphidic material, cobalt, zinc and cadmium also are dissolved, but lead remains in the residue.  Reference has been directed by the Comptroller to Specification 670,184.
Patent GB-224559-A (GB)
Title: Improvements relating to seed containers and seed sowers
IPC: A01C7/02
Filed: 1924-11-10
Abstract: 224,559. Roehrs, R. L. Nov. 8, 1923, [Convention date]. Contents, delivering.-A container in which seeds are sold and which is adapted for broadcasting or sowing the seeds, comprises a tubular body, a perforated end wall, and a hollow internal member tapering continuously from a restricted opening spaced from the end wall substantially to the interior surface of the tubular member. The container 5 is provided with a screw cap 6 at one end and the perforated wall 7 at the other is normally covered bv another screw cap 8. A guard plate 11 is provided to prevent the seeds from entering the space around the lower part of the conical hollow member 9.
Patent GB-637088-A (GB)
Title: Improvement in logarithmic circuit using electronic discharge tube
IPC: G01R15/00
Filed: 1946-09-06
Abstract: 637,088. Valve circuits. FAXIMILE, Inc. Sept. 6, 1946, No. 26845. Convention date, March 22. [Class 40 (vi)] [Also in Group XL (b)] Electronic discharge tube apparatus comprises a source of electrons, the emission from which is controlled by a stimulus and a collecting anode to which a lead impedance is connected and which has its other end placed at a predetermined potential so that the retarding electrostatic field set up by the anode and the electron velocity cause a current flow in the load impedance which is logarithmically related to the stimulus over a predetermined range. In the triode amplifier stage shown in Fig. 2, no H.T. is applied to the anode 49, electrons emitted from cathode 51 pass through the control-grid 50 in amounts proportional to the instantaneous value of the input signal and have a velocity distribution such that the number of electrons at a given velocity is proportional to the reciprocal of the exponential of the square of the velocity. A number of electrons have sufficient velocity to reach anode 49 in the absence of H.T. voltage, thus setting up a voltage across the load resistor 53 and producing a retarding electrostatic field between anode and cathode, the current flow in resistor 53 being logarithmically related to the input signal voltages from source 52. In a modification, Fig. 4 (not shown), a diode valve is used, the input signal being applied to the filament and the load resistor being connected between one side of the filament and the diode anode. Fig. 5 shows a secondary-emission valve in a logarithmic amplifier circuit, the secondaryemission electrode 39 and the final anode 38 being at the same steady potential and the retarding field voltage being set up across the load resistor 46. The Specification also describes the use of a logarithmic amplifier at the sending end of a facsimile telegraph system, Fig. 1 (not shown) (see Group XL (b)).
Patent GB-465715-A (GB)
Title: Improvements in or relating to cathode ray tube picture transmitters
IPC: H01J29/41
Filed: 1936-10-05
Abstract: 465,715. Cathode-ray tubes. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. Oct. 5, 1936, No. 27032. Convention date, Oct. 3, 1935. [Class 39 (i)] To develop electrical signals from a still picture, the picture is applied in chequer or dotted form to a screen scanned by a cathode-ray so that the secondary emission obtained from each element of the picture under bombardment by the ray depends on the tone value of the picture at the element and develops signals representative of half-tones of the picture. The screen 15, Fig. 1, scanned by the cathode-ray may have conical recesses X, Fig. 3, of depth corresponding to the local tone values of the picture, the secondary emission varying with the angle of incidence of the ray on the sides of the depression. The secondary emission flows to an anode 14 surrounding the cathode-ray and formed by a coating on the wall of the tube. The signals appear across the resistance 17. In modifications, depressions corresponding in area or number to the tone values are filled with carbon or other material having a different secondary emission from that of the aluminium plate 15.
Patent GB-1073355-A (GB)
Title: Improvements in or relating snap fasteners
IPC: A44B17/00
Filed: 1964-07-01
Abstract: 1,073,355. Stud and socket fastenings setting by handtool. KANEGA FUCHI BOSEKI KABUSHIKI KAISHA. July 1, 1964 [July 10, 1963], No. 27086/64. Heading A3H. [Also in Division E2] A stud fastener button C is supported on a platform 21 of a hand tool, the stud member A or socket is held by a vertically reciprocating member 22 and a piece of material is placed between. By depressing the handle 24 a central projection on the button pierces the piece of material and passes through a central opening in the stud or socket. A driving member movable within the member 22 descends and flattens the rim of the central projection against the base of the stud or socket adjacent the edge of the opening therein.
Patent GB-638218-A (GB)
Title: Method of and apparatus for heating coiled strip metal
IPC: C21D9/663
Filed: 1947-10-09
Abstract: 638,218. Metal-heating furnaces. WILSON, L. Oct. 9, 1947, No. 27149. Convention date, Dec. 31, 1946. [Class 51 (ii)] [Also in Group II] In an apparatus for protecting a coil of metal strip during heating, a coil of strip is supported between two independent, movable end covers having greater area than the ends of the coil to which they are applied, a protective gas, under pressure, being discharged into the centre of the coil. As shown, a coil of strip 26 is supported on a bottom plate 14, mounted on legs 16 and having a pipe 22, connected to a source of protective gas, fitted in an aperture 24, and a top plate 27 is laid on the other end. The top and bottom plates may be heated by burners 3, 4 and 19, 20. The protective gas passes through the centre of the coil and escapes between the mass of the coil and the plates. The end of the coil may be welded, Fig. 3 (not shown) or strapped, Fig. 5 (not shown), to the turn immediately below it to prevent any ingress of the furnace atmosphere.
Patent GB-170840-A (GB)
Title: A process for the production of concentrated nitric acid
IPC: C01B21/26
Filed: 1921-10-13
Abstract: 170,840. Norsk Hydro - Elektrisk Kvaelstofaktieselskab. Oct. 27, 1920, [Convention date]. Nitric acid.-In the production of concentrated nitric acid from water, or dilute acid, oxygen, and excess of liquid nitrogen oxides, so that the mixture separates into two layers, the aqueous layer consisting of nitric acid of 80-90 per cent saturated with nitrogen oxides, is drawn off and further concentrated to obtain an acid of the desired strength, such as 94- 97 per cent, and the upper layer consisting of nitric acid and nitrogen oxides without water is returned to the process together with more water or dilute acid. A portion of the aqueous layer may also be returned. The apparatus described consists of a tower filled with quartz and connected with a vat in which the separation into layers is effected.
Patent GB-722700-A (GB)
Title: Improvements in or relating to combined suction cleaner and floor polisher
IPC: A47L11/206
Filed: 1952-02-29
Abstract: 722,700. Suction cleaners. FILLERY, G. T. Feb. 29, 1952. No. 27327/53. Divided out of 722,602. Class 8 (1). [Also in Group XXIII] In a combined suction-cleaning and floorpolishing apparatus comprising an electric motor 11 driving a suction fan 13 carried in a casing 10, a polishing assembly 23 movably carried by the casing, manual or foot actuated means to retract the polishing assembly from an on-the-floor position (when the suction nozzle 17 is in an off-the-floor position) to an off-the-floor position within the casing (when the suction nozzle is in an on-the-floor position), and one or more wheels 22 rotatably mounted on the casing at the rear of the polishing assembly to support the casing from the floor, the polishing assembly and the wheel(s) are mechanically interconnected with said manually actuated control means so that when the means is actuated to bring the assembly to the on-thefloor position the wheel(s) are retracted and vice versa. As described in Specification 722,602 the polishing assembly 23 is supported from the casing 10 by links 27 and the assembly is moved against the force of springs 35 by a crank pin 34 on a spindle 33 rotated by the lever 48 forming the manual control means. The wheels 22 are carried by a frame 38 pivoted to the casing 10 at 40 and urged down against a stop 46 by springs 41. The frame 38 is formed with a cam surface 43 which co-acts with a follower 44 secured to the crank 34 in such a way that when the spindle 33 is rotated' to lower the polishing assembly, the wheels 22 are raised, and vice versa. The stop 46 is adjustable, as described in Specification 722,687.
Patent GB-1109624-A (GB)
Title: Electrolytic purification of chromate liquors
IPC: C01G37/14
Filed: 1966-06-20
Abstract: <PICT:1109624/C6-C7/1> A method of electrolytically reducing the halide ion concentration present in a chromate containing liqour comprises feeding said liquor to the anode compartment of an electrolytic cell having anode and cathode compartments separated by a diaphragm, feeding an electrolyte to said cathode compartment and effecting a discharge of halogen gas by electrolysis, the anode liquor withdrawn from the cell thus having a reduced halogen content. The chromate containing liquor may be formed by roasting chrome ore, lime and sodium carbonate at elevated temperature to produce a roasted mixture, leaching to produce a chromate containing liqour, which is then treated with CO2 or H2SO4 to produce a liquor containing sodium dichromate.  A side feed of this liquor is then treated as above to reduce the halide content therein prior to re-joining the main feed which is concentrated and Na2Cr2O7.2H2O is crystallized therefrom.  The pH of the liquor entering the cell is preferably below 7, e.g. between 5 and 6.  The anode may be of platinized titanium and the cathode of steel.  The diaphragm may be formed by a semi-permeable membrane, thus preventing passage of CrO3 ions into the cathode compartment, and the electrolyte used in said compartment may be NaOH.  The cell comprising walls top and bottom members may be formed in two identical halves about a vertical plane, the membrane, 15, being located between the two cell halves, Figs. 4 and 5 (not shown).
Patent GB-875518-A (GB)
Title: Dispensing device for fluids and semi-fluids
IPC: A21C11/16
Filed: 1959-08-11
Abstract: 875,518. Depositing-machines for icing &c. E. T. OAKES CORPORATION. Aug. 11, 1959 [Sept. 23, 1958], No. 27443/59. Class 87(2). [Also in Group VI] Pans are filled with batter or cakes are decorated with icings as they are conveyed under a dispensing head by pushers on an endless chain 22, the head having 2 or more nozzles N 1 , N 2  opened and closed alternately by valves 46 closing in the same direction as the flow of the material, the valves being operated from a common arm 51 oscillated by an air cylinder 56 supplied with a pulse of air by a cam 61 operated by the drive motor 18 and opening an air supply valve 60. A spring in the cylinder 56 returns the piston therein to counteroscillate or restore the arm 51. The supply through each nozzle is evened out by adjustable plugs in the valve outlets 68, Fig. 4 (not shown).
Patent GB-1427300-A (GB)
Title: Oral preparation
IPC: A61Q11/00
Filed: 1974-06-20
Abstract: 1427300 Oral preparations LION DENTIFRICE CO LTD 20 June 1974 [26 Nov 1973] 27445/74 Heading A5B An oral preparation comprises a non-toxic diluent or carrier, dextranase, and gelatin and/ or peptone. The preparations can take the form, for example, of dental creams, tooth powders, liquid dentifrices, mouth washes, chewing gum and dental froth trouches. Other conventional ingredients may also be present.
Patent GB-870257-A (GB)
Title: Pinch valves
IPC: F16K7/06
Filed: 1957-09-02
Abstract: 870,257. Fluid - actuated pinch valves. UNION CARBIDE CORPORATION. Sept. 2, 1957 [Sept. 4, 1956], No. 27498/57. Class 135. A fluid-pressure actuated pinch valve comprises a valve body 10, Fig. 1, having an inlet 32 and an outlet 34 connected by a flexible tube 30. A yoke 28 fixed to the valve body bears on the top of the tube and constitutes a fixed anvil and a roller 25 carried by a bracket 22 secured to a diaphragm 14 loaded by a spring 15 constitutes a movable member. In one embodiment, powdered material in an ejector 39, Fig. 3, is carried to aplace of usage by carrier gas supplied through a line 37. A solenoid-actuated cock 36 connects the line 37 either to the tube 30 to permit the flow of powder-laden gas or through a by-pass line 35 to the space beneath the diaphragm 14 so that the diaphragm and roller are moved upwardly to close the valve. In another embodiment, to regulate the pressure of gas in a delivery line 52, Fig. 5, a restriction 50 is formed in the valve outlet and a by-pass line 54 connects the delivery line to the space beneath the diaphragm to regulate the amount of opening of the tube 30 in accordance with the pressure in the delivery line.
Patent GB-426724-A (GB)
Title: Improvements in variable pitch and reversible propellers
IPC: B64C11/36
Filed: 1933-10-06
Abstract: 426,724. Variable-pitch propellers. McCOLLOUGH, J. H., 582, Santa Barbara Road, Berkeley, California, U.S.A. Oct. 6, 1933, No. 27543. [Class 114] In variable-pitch propellers in which pitch variations are effected through the engine by rotating in one or the other direction a screw threaded member in relation to another co-operating threaded member, the propellerblade adjusting-shaft 12 is screwed at 35 on a sleeve 34 on which is splined one member 38 of a friction clutch the other member 33 of which is formed on a gear 32 on the end of the propeller shaft 2. The spring 43 normally closes the clutch so that the shaft 12, the sleeve 34 and the propeller shaft rotate solidly. When the pitch is to be altered, a hand-lever is employed to disengage the friction clutch 38, 32 and at the same time to bring the member 44 of a second clutch into engagement with its associated member on a bobbin-shaped clutch member 58. The shaft 12 is now rotated relatively to the shaft 2 to alter the pitch through the gears 56, 57 on the stub shaft 54 as the clutch member 58 is splined on the sleeve 34. When the pitch is to be adjusted in the opposite direction, the clutch member is brought into contact with a friction-surface formed on the housing 29. The shaft 12 is formed with stops 67, 68 which by engagement with a collar 69 disengage the clutch member 58 when the screwed shaft 12 and with it the propeller blades reach an extreme advanced or retracted position. The angle which the blades have assumed is indicated through sliding movement imparted to a spring-controlled tube 78 which through pin and slot mechanism 84, 75 imparts a rotating movement to the annulus 73 upon which a pointer 74 is mounted. The axial movements of the rod 12 are converted into rotary movements of the propeller blades by means of the links 20, 20a mounted on the crosshead 22 the other ends of the links being eccentrically mounted on the ferrules 16 to which the roots of the blades 25 are secured.
Patent GB-437641-A (GB)
Title: Improved amplifiers for television
IPC: H03F1/50
Filed: 1934-02-26
Abstract: 437,641. Valve amplifying circuits. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. Feb. 26, 1934, No. 27548/35. Convention date, Feb. 25, 1933. Divided out of 439,164 and addition to 410,147. [Class 40 (v)] A resistance 6 is connected in parallel with a coil 5 in series with a resistance 4 in an amplifier for television. The resistance so damps the coil that it does not oscillate at its natural frequency. The circuit elements are so dimensioned that equal amplification of all the frequency band is obtained. The amplifier is used at a transmitter.
Patent GB-1391881-A (GB)
Title: Sealing connector for the charging apertures of coke ovens
IPC: C10B25/24
Filed: 1973-06-11
Abstract: 1391881 Charging coke ovens BERGWERKSVERBAND GmbH 11 June 1973 [10 June 1972] 27650/73 Heading F4B The telescopic shoot 1 of a coke-oven charging device has an end member 3 telescopically sealed to the shoot 1 by sealing rings 2, the end member 3 having a spherically shaped end engaging a spherical seat formed in a ring seal 6 adapted to engage the charging hole frame of the coke oven, and resiliently connected by springs 4b to the end member. Stubs 7a are provided on the end member to engage the charging machine.
Patent GB-413154-A (GB)
Title: An improved method of and apparatus for disintegrating paper or like pulp
IPC: B02C13/09
Filed: 1933-10-07
Abstract: 413,154. Disintegrating paper pulp. JOHNSON, J. Y., 47, Lincoln's Inn Fields, London.-(Scott Paper Co. ; Chester, Pennsylvania, U.S.A.) Oct. 7, 1933, No. 27664. [Class 96.] Apparatus for disintegrating paper or like pulp comprises a tank 1, containing oppositely acting propellers 4 producing opposed currents, and transverse baffle plates 15 spaced apart and away from the ends of the tank 1 and having their upper surfaces inclined to the horizontal. Bales to be disintegrated are dumped into the tank 1, e.g. from a conveyer, through an opening 2 and mixed with water from a pipe 6, and pulp is withdrawn through perforated plates 12, by a pipe 7, e.g. supplying a Jordan, the plates 12 supporting a bearing 14 for the shaft 3 of the propellers 4 driven by a motor 5. In a modification, there is a series of propeller shafts, and the plates 12 and outlet 7 are replaced by plates at each end of the tank and having perforations of different sizes respectively, enabling different grades of pulp to be withdrawn simultaneously. In another modification, the plates 12 are dispensed with, and pulp is withdrawn through perforations in the walls of one or both baffles 15.
Patent GB-645272-A (GB)
Title: A hydraulically and mechanically controlled brake
IPC: F16D65/14
Filed: 1947-10-15
Abstract: 645,272. Internally expanding brake. REGIE NATIONALE DES USINES RENAULT. Oct. 15, 1947, No. 27664. Convention date, Oct. 17, 1946. [Class 103 (i)] An internally expanding brake adapted to be controlled either by hydraulic or mechanical means, of the type wherein the mechanical actuating means comprising the spreader device 6, 7 acts as a fixed abutment point when the shoes 1 are spread apart by the hydraulic actuating means 2, is characterized in that the cams 3, that serve to adjust the shoe clearance, act as fixed abutment points when the shoes are spread by the mechanical actuator 6, 7. The shoes press against the cams 3 through integral elements 5 so inclined that the displacement of one of the shoes by the friction of the braking drum tends to increase the pressure of that shoe against the drum. For setting the shoe clearance, the cams 3 are adjusted by means of a nut 18 locking discs 14 and 16 secured to the brake baseplate 17 and cam spindle 19 respectively and having complementary interengaging serrated edges 15.
Patent GB-1292370-A (GB)
Title: Device for supporting index cards
IPC: B42F17/02
Filed: 1970-06-09
Abstract: 1292370 Filing papers PRATIC BURO 9 June 1970 [16 Feb 1970 22 May 1970] 27725/70 Heading B6E An index card filing drawer, container or cabinet has its compartments subdivided to conform to the size of the index cards by suspending the floor members 7a, 7b, 7c, Fig. 1, provided with supporting rods 5, 6, from end supports 1, 2 by means of vertical arrays of holes 3, 4 in the end supports 1, 2 which in turn are suspended by arms 16, received slidably in channels in the supports 1, 2, on the edges of the filing drawer &c. The floor members may be disposed at different levels (as shown in Fig. 2). To subdivide the drawers into a number of longitudinal compartments a number of intermediate portions 30, Fig. 5, depending from a longitudinal member 20 is fitted into the drawers and supported at their ends by inserts 21, Fig. 3, whose free ends are received in the channels 19 attached to the end walls 18 of the drawers. The floor members 7 are modified in that they are provided with a single channellike supporting member 25 the free ends of which are passed through a selected one of passages 24 is a respective end support 2a which is carried by means of clips 28 engaging the channel 19. Transverse partitions are formed by supports 12 provided with passages 26 for the member 25 and with a head-piece 27 provided with a slot 27c for engagement of the upper edge of the support 12 and a channel 27b for reception of the arms 16 which are engaged over the upper edge of the longitudinal member 20. The head-piece 27 is also provided at its upper edge with a slot 27a forming a support for the edge of an index label.