baber/WOPTO huggingface dataset:
Patent GB-1388545-A (GB)
Title: Catadioptric lenses
IPC: G02B17/08
Filed: 1971-06-09
Abstract: 1388545 Catadioptric objective RANK ORGANISATION Ltd 26 May 1972 [9 June 1971] 19791/71 Heading G2J A catadioptric objective comprises an annular concave primary mirror having a curvature lying between  F  and 1/F, where F is the equivalent focal length of the complete objective, a secondary mirror receiving light from the primary mirror and reflecting it to an image-receiving area positioned within 0.1F of the central aperture of the primary mirror, and at least one lens component, the sum total of the curvatures of individual surfaces multiplied by the change in the reciprocal of the mean refractive index when crossing the respective surfaces (with the refractive indices difference at the mirror surfaces counting as -2 or 2 being numerically not greater than 1/3 F  and the overall length of the objective not exceeding 1.6F. The objective may include a lens component behind the secondary mirror having its rear surface not more than F/2 from the focal plane. The objective may also include an astigmation correcting doublet followed by a field flattening lens behind the secondary mirror. One or more lens components of power between -1/10F and 1/3F may be placed in front of the primary mirrors, one of which carries the secondary mirror on its rear surface. A focusing mechanism may move the two mirrors and any lenses associated with the second mirror. Data are given for five examples of which one is for use with infrared wavelengths.
Patent GB-1394673-A (GB)
Title: Method for preparing the equimolecular salt of piperazine and 1,2-diphenyl-4-butyl-3,5-dioxo-pyrazolidine
IPC: C07D231/34
Filed: 1971-06-10
Abstract: 1394673 Piperazine salt SOC D'ETUDES ET DE REALISATIONS SCIENTIFIQUES EN ABREGE SERESCI Sprl 7 June 1972 [10 June 1971] 19881/71 Heading C2C The salt of formula is prepared by dissolving the components separately in the same organic solvent, which is a ketone, ether, ester or a chlorinated aliphatic hydrocarbon C x H y Cl z  (x=1-3, y=0-6, z= 1-6), mixing the solutions stirring the mixture, adding a few seed crystals, stirring until a precipitate of the salt is obtained, and isloating it by filtration, washing and drying.
Patent GB-1398981-A (GB)
Title: Door handle assemblies
IPC: E05B65/20
Filed: 1972-04-29
Abstract: 1398981 Locks WILMOT-BREEDEN Ltd 26 April 1973 [29 April 1972] 19994/72 Heading E2A The mounting bracket 1 of a recessed, horizontally pivoted door handle is mounted on the rear panel 8 of the door by means of a pair of outwardly projecting ears 6 which pass through key-hole slots 17 in the panel and drop to a position in which their necks pass through the parts 17b of the slots and the ears lie beyond the panel (as shown), while other similar ears 7 provide an abutment on the near-side of the panel. The assembly is held in its lower, fixed position, shown, by screws as 19 engaging threaded bores at 18 in the panel. One of these screws secures an escutcheon plate 23.
Patent GB-868777-A (GB)
Title: Bowling ball stop mechanism
IPC: A63D5/02
Filed: 1959-06-11
Abstract: 868,777. Skittle alleys. AMERICAN MACHINE & FOUNDRY CO. June 11, 1959 [June 18, 1958], No. 20075/59 Class 132(2). In a skittle alley having a return ball runway 14 beneath the floor level 12 between two alleys or at the side of one alley and terminating in an up-sweep portion 16 leading to a downwardly inclined runway 30 feeding a storage rack S, the ball is engaged on portion 16 between a friction wheel 28 rotated in the direction shown and stationary means e.g. band 64, the action being to stop the ball's rotation and then reverse it, the ball being released at the inlet end of runway 30. As shown band 64 passes over roller 76 and is attached at one end to a spring 80 and at the other to the free end of arm 72 pivoted to the frame at 74. The band 64 can thus give to grip the ball resiliently. In a modification, the band 64 is replaced by a pair of arcuate rails covered with resilient material and spaced from wheel 28 by slightly less than the ball diameter.
Patent GB-1417678-A (GB)
Title: Percussion drilling machine
IPC: B25D16/00
Filed: 1974-05-07
Abstract: 1417678 Rotary/Percussive drills ROBERT BOSCH GmbH 7 May 1974 [9 May 1973] 20129/74 Heading B3C [Also in Division B4] A rotary-percussive drill comprises an axially movable outwardly spring biased output shaft having a toothed impact member mounted thereon which can engage a toothed disc which is braked to produce percussive movement and free to move for rotary drilling. As shown a driven gear-wheel 14 engages, by means of pins and slots 26, 27 an impact member 20 having teeth 28 thereon. A disc 30 is provided with teeth 29 engaging teeth 28. For rotary drilling an eccentric 37 is rotated by a knob 36 to move output shaft 15 outwardly and a tapered surface 33 on disc 30 is released from a fixed mating tapered surface 35 so that disc 30 can rotate freely. For percussive drilling the eccentric is moved to the opposite position. If the drill is freely held it will rotate as before since the first percussive movement frees disc 30 and allows such rotation. When the work is engaged the disc 30 is braked against fixed surface 35 and teeth 28 override the teeth 29 to cause percussive movement. In a modification the tapered surfaces may be replaced by toothed surfaces and in a further modification a clutch may be provided to allow percussive movement without rotation.
Patent GB-758152-A (GB)
Title: Process for the production of spongy iron powder
IPC: B22F9/00
Filed: 1954-07-09
Abstract: 758,152. Making metal powder. SIMETAG SINTERMETALLGES. July 9, 1954 [July 10, 1953], No. 20198/54. Classes 83 (2) and 83 (4). Powder metallurgy.-In a method of making spongy iron powder, liquid pig-iron or ironcarbon alloy is sprayed to form a crude powder which is ground to a grain size of 5-50 microns before chemical reduction to form a compact oxygen- and carbon-free powder. The reduction is carried out at 400-1050‹ C. in a continuous kiln with a small quantity of moist hydrogen and articles sintered from the powder are pressed at 6 tons/sq. cm. and sintered for two hours at 1250 ‹ C. in a hydrogen atmosphere. The articles may be recompressed and sintered at the same temperature and pressure for one hour.
Patent GB-419050-A (GB)
Title: Improvements in sides for spectacles
IPC: G02C5/00
Filed: 1934-07-10
Abstract: 419,050. Spectacles. NITSCHE & GUNTHER, OPTISCHE WERKE AKT.- GES., Rathenow, Germany. July 10, 1934, No. 20215. Convention date, Dec. 11, 1933. [Class 97 (i).] A side or temple piece consists of a metal core, for example of phosphor bronze, to which is applied a covering of pure nickel, the covering being closely joined or welded to the core in the same manner as is customary in making rolled gold or gold filled material.
Patent GB-992008-A (GB)
Title: Improvements in or relating to the sound-deadening characteristics of walls
IPC: E04B2/74
Filed: 1961-06-08
Abstract: A compound comprising synthetic plastics material, for example polyvinyl chloride, natural highly polymeric materials or bituminous material loaded by at least an equal amount of finely divided heavy metal, heavy metal compound or heavy mineral is applied to a wall or wall element so as to cause its coincidence frequency to be displaced into a higher frequency range, the modulus of elasticity of the coating material being less than one hundredth of that of the building material from which the wall or wall element is made, the weight of the wall or wall element being increased by at least 65% as a result of the application of the coating material.  The compound may be applied to the wall or wall element directly by spraying, trowelling or brushing or may be mounted on a pliable backing, for example of paper or jute, textile or glass fibre fabric which is fastened to the wall or wall element as by adhesive.  The loading material may be bismuth or lead or a compound thereof, or heavy spar or cinnabar.  The wall or wall, element may comprise metal, wood plaster, wood wool cement, asbestos cement or polystyrene foam.
Patent GB-561322-A (GB)
Title: Improvements in or relating to frequency modulating arrangements
IPC: H03C3/24
Filed: 1942-11-04
Abstract: 561,322. Frequency modulation. FOUNTAIN, Ltd., G. R., HOULGATE, H. J., and WHEELER, G. C. Nov. 4, 1942, No. 20359/43. Divided out of 561,304. [Class 40 (v)] The frequency of a back-coupled resistancecapacity oscillator, operating on the phase-shift principle, is modulated by applying the signal current to one or more of the resistance elements of the back-coupling network, the modulated resistance elements being constituted by reversely-connected non-linear resistances. As shown, the network connected between the plate and grid of the valve V comprises a number of series condensers C and shunt resistances R1 ... R4, one or more of the latter being constituted by a pair of rectifiers r, r<1> connected in parallel but with opposite polarity. The resistance of the rectifiers is varied by the signal voltage LF applied in series with an adjustable bias DC across an impedance Z1. The rectifiers operate on such portions of their characteristic curves that a linear relation exists between the voltage LF and the oscillation frequency. A filter Z2 in the output circuit passes the carrier but rejects the modulating frequency. The rectifiers may be replaced by varistors or thermistors. An application of the invention to audible alarm apparatus is described in Specification 561,304.
Patent GB-478672-A (GB)
Title: Improvements in smoking pipes
IPC: A24F1/00
Filed: 1936-07-23
Abstract: 478,672. Tobacco pipes. BRENNINGER, A. W. July 23, 1936, No. 20452. [Class 130] In a pipe having a longitudinal ventilation slot 11 in the stem 6 to enable it to be readily cleaned and dried, the mouthpiece is provided with a bar or finger 21 for closing the slot and with a tubular member 9 insertable in the smoke passage 7 to seal it from the slot. As shown in Figs. 2 and 3, the tube 9 is threaded at 16 in the mouthpiece and internally bevelled at the forward end 9a to fit a corresponding seating in the stem, and has in its under side a slot 14 in which nicotine &c. may condense. The forward edge 15 of the slot is shaped to clean the bore of the stem when the tube 9 is withdrawn. The bar 21 is formed integral with a disc 20 freely rotatable on the tube 9, and slides between shoulders 22 on the stem. Index marks on the disc 20 and the mouthpiece are in register when the slot 14 in the tube 9 is in its normal bottom position. In a modification, Fig. 9, the stem 6 has a reduced outer end on which is mounted a metal reinforcing sleeve 28 formed with a groove 29 aligned with the slot 26 to receive the bar 21.
Patent GB-619973-A (GB)
Title: Improvements in apparatus for filtration of liquids
IPC: B01D29/00
Filed: 1946-07-09
Abstract: 619,973. Filters. PATERSON ENGINEERING CO., Ltd., and BAILY, E. W. July 9, 1946, No. 20495. [Class 46] A filter using filter aid comprises a rotatably mounted filter casing 10, a diaphragm 21 forming a manifold 22 at one end, a solids outlet 12 at the other end, filter elements 25 mounted on the diaphragm 21, an inlet 13 which may lead from a hollow trunnion 30, discharging adjacent the diaphragm 21, and an outlet 23 from the manifold, which may lead to a hollow trunnion 30, discharging adjacent the solids outlet 12, a second inlet 45 discharging adjacent the diaphragm 21, and an outlet 23 from the manifold, which may lead to a hollow trunnion 31. A baffle 47 across the discharge end of the inlet 45, and a vent-pipe 50 are provided. To form a coat of filter-aid on the elements, a slurry, e.g. of diatomaceous earth in water, is introduced through the inlet 13, the water flowing upwardly through the elements and out through a pipe 38. When the coat is completely formed, the casing 10 is inverted and inlet valve 15 closed. The water in the filtering chamber is then siphoned off through pipes 23, 38. For admission of liquid to be filtered, valve 46 is opened. When the coat has become so contaminated that it must be removed, the filter is rotated to the original position shown and the drain 12 opened, when the coat falls from the elements 25. When valuable liquid is being filtered, the casing is drained and the manifold 22 filled, through the elements 25, with water, before the second inversion,. This water may then be used for backwashing. The filter element may consist of a helical wire winding, multiple discs, wire mesh, or porous ceramic candle.
Patent GB-794922-A (GB)
Title: Improved draught preventer for motor vehicles
IPC: B60J1/20
Filed: 1955-07-15
Abstract: 794,922. Screens for vehicle windows. LE GRYS, G. H. May 10, 1956 [July 15. 1955; March 7, 1956], Nos. 20571/55 and 7117/56. Class 20(3) A transparent draught preventing screen 4, made e.g. of glass, or of transparent synthetic plastic material, is fitted inside a vehicle in an inclined position across the top of a frame 1 for a sliding window 3 its upper edge being more remote from the plane of the window 3 than its lower edge. The screen 4, curved along the top to match the frame 1, and supported at each end in a bracket 5 screwed to the frame 1, is preferaby used in conjunction with a front swing window 2. Adjustable side brackets, not shown, can be used for varying the inclination of the screen. Further modifications show side brackets formed as integral parts of the screen.
Patent GB-516891-A (GB)
Title: Wave transmission systems
IPC: H03J3/12
Filed: 1938-07-12
Abstract: 516,891. Wireless receiving circuits. KOLSTER-BRANDES, Ltd., and SMYTH, C. N. July 12, 1938, No. 20665. [Class 40 (v)] In a receiver which is arranged to give a maximum response when slightly off-tune from the desired carrier, the amount of off-tune is controlled by the strength of the received signal or by the strength of an interfering carrier. For example, in the circuit shown in Fig. 2 the circuit is tuned to a frequency slightly above or below the intermediate frequency so that the D.C. output, which is used to control a tuning indicator, to remove a blocking bias from a muting device or for automatic frequency correction, is a maximum at the off-tune frequency. The adjustable unit, shown as condenser C, is adjusted automatically in accordance with the strength of a wanted or an interfering signal. For example, the unit could be a valve, the effective capacity loading of which on the circuit is adjusted by the grid - bias supplied by the A.V.C. actuating voltage. Specification 457,485 is referred to.
Patent GB-300150-A (GB)
Title: Instrument for counting the number of revolutions of shafts
IPC: G06M1/04
Filed: 1927-08-05
Abstract: 300,150. Ach, N. Aug. 5, 1927. Associated counters. - A number or group of revolution counters 20, 21, 22, Fig. 1 is adapted to be operated selectively from a rotating shaft 1 at different speed ranges thereof, by a tappet lever 11 which is brought automatically and selectively into operative relation with the counters according to the speed of the shaft 1. The position of the lever 11 is controlled by a stepped cam disc 7 the angular position of which is automatically determined by the angular speed of the shaft 1. The cam 7 acts on a spring-controlled arm 8 to which the lever is pivoted. The lever 11 is operated to actuate one or other of the pawls 23, 24, 25 of the counters by a disc 13 on the shaft 1 and a pin 15 thereon, which rocks a lever 16, 17 on each revolution of the shaft 1. The disc 13 also carries a pin 14 which synchronously rocks the arm 8 and so prevents any locking when a section of the cam of larger radius comes into position. Two modified constructions of apparatus are, described. In one of these a series of counters is circularly arranged and adapted to be selectively operated by a tappet arm, the angular position of which is automatically adjusted according to the speed of rotation of the shaft whose operation at different speeds is to be registered. In another modification the counters are vertically arranged and operated by vertical spring-controlled rods.
Patent GB-1259974-A (GB)
Title: Process for purifying chlorinated hydrocarbons
IPC: C07C17/38
Filed: 1969-04-23
Abstract: 1,259,974. Purification of halogenated hydrocarbons. WACKER-CHEMIE G.m.b.H. 23 April, 1969 [23 April, 1968], No. 20740/69. Heading C2C. A process for purifying saturated or unsaturated aliphatic or aromatic chlorinated hydrocarbons comprises removing metal salts having the character of Lewis acids by treating the same with an anhydrous 1,2-alkanolamine optionally with the addition of dry ammonia and separating the resulting insoluble compounds.
Patent GB-1457329-A (GB)
Title: Power assisted steering systems
IPC: B62D5/07
Filed: 1974-05-10
Abstract: 1457329 Power assisted steering systems ZAHNRADFABRIK FRIEDRICHSHAFEN AG 10 May 1974 [10 May 1973] 20753/74 Heading B7H A power steering system includes a valve arrangement for cutting off the power assistance as the steering motor approaches the end of its stroke. The steering motor chambers 9, 10 are supplied from a pump 2 via a control valve 4 and the motor piston 12 is connected by an arm 13 to the steering shaft 14. The pump supply line 3 is connected to a valve 27, having chambers 28, 30 separated by a spring loaded piston 29, and the working lines 7, 8 are connected to chambers 19, 20 of limiting valves 17, 18 which include spring bonded pistons 25, 26, actuated by cams 15, 16 in the steering shaft, in chambers 23, 24 connected by line 31 to chamber 30 of valve 27. The chambers 28, 30 of the valve 27 are inter-connected by a throttle line 34 and piston 29 normally closes an exhaust groove 36. Clockwise rotation of shaft 14 moves the spool 40 of valve 4 to the left and pressure fluid enters chambers 10 and 20 whilst chambers 9 and 19 are exhausted. When cam 15 lifts piston 25 fluid in chamber 30 of valve 27 is exhausted via the limiting valve 17 and piston 29 is moved by the pressure differential thereacross to open groove 36 and thus spill the supply from the pump to exhaust.
Patent GB-1012857-A (GB)
Title: Liquid fuel injection pumps for internal combustion engines
Inventor: KEMP KENNETH ALBERT WALTERS
IPC: F02M41/14
Filed: 1963-05-24
Abstract: 1,012,857. Fuel injection pumps. C.A.V. Ltd. May 6, 1964 [May 24, 1963], No. 20770/63. Headings F1A and F1B In a fuel injection pump comprising a rotary distributor 11 having a bore 17 formed therein housing pump pistons 18, the pistons being moved outwardly by fuel fed to the bore by shuttles 27 and 28 and inwardly by a cam 20, the maximum outward movement of the shuttle 28 is determined by the output pressure of the feed pump 12. The feed pump supplies fuel alternately to opposite ends of the shuttles 27 and 28 at a pressure dependent on the speed of the engine being supplied and their outward movement is determined by a throttle 33 to a maximum determined by stops 38 and 39 respectively. The stop 38 remains fixed during operation of the pump and the stop 39, biased by a spring 41, is subject to the outlet pressure of the feed pump 12 via fuel outlet 14, Fig. 2. The stop 39 is of profiled form to reduce the maximum outward movement of the shuttle 28 as the fuel pressure increases. The outer end of the shuttle 28 is placed in communication with the inlet 13 of the feed pump during rotation of the distributor 11 and the shuttle 27 similarly by means of a passage 42a and a port 42 communicating with the outer end of the shuttle 28. At starting with zero-fuel pressure the member 39 is positioned to permit the shuttle 28 to move to the maximum extent provided a recess 43 in the member 39, the member closes the port 42 and shuttle 28 uncovers a passage 44a, Fig. 6, to allow fuel to flow directly into the bore 17 and provide excess fuel for starting. With rise in pressure the passage 44a is closed by the shuttle, the port 42 uncovered by the member 39 and the quantity of fuel delivered is governed by movement of the shuttles. The injection timing of the engine is varied by a spring-loaded piston 45, Fig. 5, subject to the outlet pressure of the feed pump.
Patent GB-745013-A (GB)
Title: Improvements in or relating to the manufacture of carburised machine parts
Inventor: GADD ERNEST REGINALD
IPC: C23C8/00
Filed: 1953-07-28
Abstract: An alloy containing 9-14 per cent Cr, not more than 0,30 per cent C, 0-1 per cent each of Si and Mn, 0-0,045 per cent each of S and P, 0-5 per cent each of Ni, Co, Mo and W, the balance being Fe and unavoidable impurities, is carburised and subsequently heat treated by quenching from 950-1150 DEG C. and tempering at 300-650 DEG C. The carburising may be carried out by heating to 900-1200 DEG C. for up to 12 hours in a mixture of wood charcoal and barium carbonate, or in an atmosphere of a carburising gas, or in a fused bath of a carburising salt.  The case produced after carburising and heat treating is stated to have a hardness of 683 V.P.N. and does not soften at temperatures up to 450 DEG C.
Patent GB-775949-A (GB)
Title: Process of producing metallic zinc from zinc sulphides
IPC: C22B19/04
Filed: 1955-07-19
Abstract: Zinc is produced by reacting zinc sulphide with zinc oxide, the reactants being in a state of molten flux, at at least 1500 DEG C. and under a pressure not substantially less than atmospheric. Preferably the mixture is ground to a fineness of at least 4900/cm2 mesh and compressed into tablets &c. and charged into a furnace preheated to at least 1500 DEG . the charging rate being such as not to reduce the temperature below 1400 DEG C.  A flux of e.g. alumina and aluminium sulphide or a molten mixture of the raw materials themselves, may be initially in the furnace.  The temperature is then raised to 1500-1600 DEG C., and then metallic zinc recovered by suddenly cooling with the admission of large volumes of cold inert gases, e.g. hydrogen, nitrogen, methane.  After separating the zinc and SO2 the cooled residual gas may be reemployed as coolant.
Patent GB-639794-A (GB)
Title: Improvements in or relating to electron-discharge tubes
IPC: H01J5/12
Filed: 1947-08-01
Abstract: 639,794. Thermionic valves. PHILIPS LAMPS, Ltd. Aug. 1, 1947, No. 20927. Convention date, Aug. 6, 1946. [Class 39 (i)] In a valve as disclosed in Specification 611,381, comprising a shielding plate 2 and a trimming condenser, one electrode of which is constituted by a part of the shielding plate, and is separated from the semi-circular plate 4 which is secured to a contact pin 3 and forms the other electrode, by a dielectric in the form of an insulating plate 5 which is rotatable about the contact pin 3 and has an aperture 6 which varies the capacity of the condenser when rotation is effected through the slot 7, said shielding plate 2 is provided with incisions 8 and 9 so that the portion which functions as an electrode of the trimming condenser is resilient and engages the insulating plate 5 with a definite pressure, thus preventing movement of the latter during transport or due to thermal strains in the shielding plate 2. The latter is embossed at several points, thus forming elevations 10 which bear against the bottom of the valve and prevent the shielding plate from being slightly pressed in when the valve is inserted in a holder, with consequent possibility of movement of the insulating plate 5.