baber/WOPTO huggingface dataset:
Patent GB-537937-A (GB)
Title: Improvements in diversity systems of radio reception
IPC: H04B7/08
Filed: 1940-03-15
Abstract: 537,937. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 15, 1940, No. 4884. Convention date, March 15, 1939. [Class 40 (v)] In a diversity receiving system, means responsive to a voltage dependent on the amplitude of signals applied to the receiver are used for selectively connecting the input of the receiver to one or other of a pair of antennae. The input 4 of a receiver 1 may be selectively connected to either of a pair of antennae 5, 6 by means of a relay 7 having opposed windings 9, 10 arranged in the anode circuits of a pair of gas discharge valves 20, 21 having control grids connected in parallel to a source of negative A.V.C. potential 3. As shown antenna 5 is in use and valve 20 is drawing current from source 22. If now the signal on 5 fades the grids of valves 20, 21 become less negative until suddenly valve 21 starts to draw current. The fall in potential across 24 acting through coupling condenser 25 reduces the potential of the anode of 20 so that it ceases to conduct. The current through 21 acts on coil 10 to switch over to antenna 6. In a modification the antennae are connected to the receiver through tuned circuits and a pair of thermionic valves which are alternately biased to cut off by the current through the discharge tubes 20, 21. In a further modification, the control potential for the grids of the gas discharge tubes 20, 21 depends on the differential effect of the rectified carrier and audio frequency in the received signal, and operates to switch over the antenna when the carrier has faded so as to produce more than 100 per cent modulation. In all cases, time constant circuits may be provided in the grid circuit of valves 20, 21 to prevent oscillation.
Patent GB-846518-A (GB)
Title: Improvements in or relating to the manufacture of monovinylacetylene
IPC: C07C2/38
Filed: 1958-02-17
Abstract: Monovinylacetylene is prepared by the polymerisation of acetylene in the presence of an agitated aqueous cuprous chloride catalyst solution in which is dispersed 5-25% by volume, based on the total catalyst volume, of a nonviscous liquid hydrocarbon or chlorinated hydrocarbon having a boiling point of at least 100 DEG C. Suitable additives include kerosene, fuel oils (preferably containing about 50% aromatics), white oils, solvent naphthas, toluene, xylene, cymene, mesitylene, decahydronaphthalene, cetane, cetyl chloride, tetrachloroethylene, monochlorobenzene, o-dichlorobenzene, chlorocyclohexane and chloronaphthalene.  Also added is 5-15% by weight of the hydrocarbon or chlorohydrocarbon of a dispersing agent which may be of the non-ionic type such as polyethylene oxides terminated with phenols, alcohols or mercaptans, polyesters of glycols and dibasic acids and esters of polyhydroxy compounds and fatty acids, or of the ionic type such as long chain quaternary ammonium salts and the hydrochlorides of copolymers containing basic amino nitrogen and long chain hydrocarbon side chains.
Patent GB-1083565-A (GB)
Title: Process for the catalytic oxidation of propylene
IPC: B01J23/28
Filed: 1966-02-04
Abstract: Acrolein, acetaldehyde and formaldehyde are prepared by oxidizing propylene with a molecular oxygen-containing gas in the presence of a catalyst comprising a heavy metal oxide, defined to be an oxide of molybdenum, vanadium, tungsten or bismuth, and an activator consisting of a mixture of oxides of arsenic and boron. The preferred catalyst containing molybdenum oxide is obtained by the calcination in air at 300-500 DEG  C. of molybdic acid or ammonium molybdate in the presence of boric and arsenic acids deposited by dispersion, precipitation or impregnation on a carrier such as silica, carborundum or pumice. The preferred molar ratio of boron to molybdenum and of boron to arsenic is from 0.2 to 5. The oxidation process is carried out in a static or fluidized bed reactor at a temperature of from 250-450 DEG  C. and at a pressure of from 1-10 atmospheres (absolute).  The reaction feed mixture comprises propylene, water vapour and excess air and may contain propane.  The reaction gases may be rec-cycled after removing the products by condensation followed by water washing. The products are identified by chromatographic analysis and molar partial conversions and yields are given for different catalyst compositions and reaction conditions. The process is also operated using a boron-free catalyst composition for comparison.  Acetic acid, acetone and propionaldehyde are obtained as by -products.
Patent GB-128525-A (GB)
Title: Improvements in Carburettors for Internal Combustion Engines.
Inventor: WALFORD ERIC WESTON
IPC: F02M1/00
Filed: 1919-03-01
Abstract: 128,525. Walford, E. W., (Holley, G. M.). March 1, 1919. Spray carburettors.-In a carburettor for use with alternative fuels, the particular fuel required is selected by rotating a ported tube, the interior of which is open to the atmosphere and forms a preliminary mixing chamber, the rich mixture formed therein being drawn through an exhaust heated vaporizer into the main mixing chamber of the carburettor. The float chamber A has an extension A<2> which is secured to a lug B<2> on the mixing chamber B by a bolt B<3>, and forms the casing of the mixing tube D which is rotatable from a distance through the universal joint D<3>. One fuel is supplied through a passage A<4> and another through A<5>, and opposite these passages are ports D<8>, D<9> in the tube, of different sizes and at different angular positions, by means of which the fuels are selected and controlled. The tube is held in its adjusted position by a spring-pressed ball D<6>. Air enters the tube at D<2>, and the rich mixture, after passing through a vaporizer, enters the main mixing chamber B at B<4>. The air supply to this chamber is controlled, mainly at starting by a valve C<4>, and during normal working by an automatic valve E. A delicate adjustment of the air supply is provided by a bevelled tube G which mav be rotated by a disk G<6> and controls a passage F which bypasses the valve E.
Patent GB-566980-A (GB)
Title: Treatment of granular polyvinyl acetate with sebacic acid
IPC: C08J3/12
Filed: 1943-03-31
Abstract: Where polyvinyl acetate is prepared in finely-divided form suspended in an aqueous vehicle, the particles are prevented from agglomeration by coating them with sebacic acid and then drying them at an elevated temperature.  Because of the solubility of sebacic acid in water, the invention is carried out most economically by separating the polymer particles from the aqueous vehicle before coating them.  It is preferred to use between 0.3 and 1.0 per cent by weight of the polymer of sebacic acid and to carry out the drying process between 50 and 100 DEG  C.  The process is also applicable to copolymers in which vinyl acetate is a major constituent, e.g. copolymers with ethylene or methyl methacrylate.
Patent GB-255758-A (GB)
Title: Improvements in priming devices for multi-stage rotary pumps
IPC: F04D9/06
Filed: 1926-02-23
Abstract: 255,758. Hentschel, R. Feb. 23, 1926. Multi-stage centrifugal pumps; starting, facilitating.-In a multi-stage pump wherein priming is effected by an injector, one or more of the pump stages can be used for operating the injector which feeds into the outer of two connected concentric chambers the inner of which is in communication with the impeller. A two-stage pump is shown in Fig. 1 and its stages a, b are separated by the double chamber d, l. Entrance to the inner chamber d from the first pump section a is controlled by a valve composed of a spring- pressed ring c or a number of hinged flaps. An air vent r in the wall of the outer chamber is controlled by a float valve q. The injector e is fed through the pipe f from the pressure chamber g of the second pump section b and the liquid passes through the pipe k to the lower part of the chamber l from whence it passes to the chamber d and the impeller b, so maintaining a circulation. The injector creates a suction in the chamber e and draws air from the chamber i. The air travels with the water until it escapes through the vent r. When the air is exhausted, water will enter through the pipe h until the chamber l is filled; the float valve q then closes, and the injector can be shut off for the commencement of the pumping. The injector can be used during pumping for the discharge of air from the suction chamber i, and the pipe k may have a second mixing cone in addition to the cone y. An annular gap round the shaft is connected to the pipe h to prevent leakage. The two valves for shutting off the injector may be in one plug.
Patent GB-1211432-A (GB)
Title: Blood letting lancet
IPC: A61B5/15
Filed: 1968-02-01
Abstract: 1,211,432. Blood-letting lancet. PROPPER MFG CO. Inc. 1 Feb., 1968 [9 Nov., 1967], No. 5166/68. Heading A5R. A disposable blood-letting lancet is comprised of a single piece of sheet metal, e.g. a stamping and has an elongated body portion 11 with two or more corrugations 13 with raised dimples 16 (to facilitate gripping) and a point 25 at one or both ends formed on a central corrugation 27, the point(s) projecting the required distances from the shoulders 17. When a point is present at both ends, they are of different lengths, e.g. c. 0.094" and 0.156", to suit different subjects (Fig. 8, not shown). Preferably, the points are of the shape indicated in Fig. 2 (not shown) with a discontinuity in the side edges giving a sharp point on a robust base.
Patent GB-666264-A (GB)
Title: Wire stripper
IPC: H02G1/12
Filed: 1949-02-25
Abstract: 666,264. Wire stripping tools. DEHN, S. G. (General Cement Mfg. Co.). Feb. 25, 1949, No. 5218/49. Class 36. [Also in Group XXIII] In wire stripping tools having two pairs of jaws, one pair for gripping the wire and the other for cutting the insulating covering thereon and in which the pairs of jaws are moved apart to strip the insulation therefrom, a fingeroperated catch is provided to prevent closing together of the pairs of jaws until the stripped wire has been released from the jaws. One gripping jaw 16 and one stripping jaw 21 are carried on the upper ends of L-shaped jaw carriers 10 and 11 pivoted on a pin 12 and normally held in closed position by a spring 26. The other gripping jaw 17 and the other stripping jaw 22 are operatively connected with the upper ends of the handle levers 19 and 24 which are pivoted to the jaws carriers 10 and 11 at 20 and 25. With the parts in the position shown in Fig. 1, the covered wire is laid between the jaws. On gripping together the handles the jaw 16 approaches the jaw 17 to grip the wire and the jaw 21 approaches the jaw 22 to sever the wire covering, the spring 26 is compressed and the jaw carriers then open about the pivot pin 12. At the same time the inwardly bent stepped end 38 of a catch-plate 33 pivotally and oscillatably mounted on the pivot-pin 12 moves under the influence of the spring 36 into the crotch between the jaw carriers 10 and 11 to prevent closing thereof on release of the handle levers 19 and 24. After removal of the wire, the catch-plate is moved to inoperative position by finger pressure on the tail portion 43, whereby a lug 39 on the front cover-plate 40 is released from the slot 41 in the catch-plate and the stepped lug 38 lifted into engagement with the outer end of the lug 39. U.S.A. Specification 2,313,793 is referred to.
Patent GB-546313-A (GB)
Title: Improvements in and relating to screw thread gauges
IPC: G01B3/48
Filed: 1941-04-23
Abstract: 546,313. Screw thread gauges. GILSON & CO., Ltd., D., WRIGHT, A. F. J., and BANNISTER, E. April 23, 1941, No. 5256. [Class 106 (ii)] A yielding platform 12 is provided between the ribbed or threaded gauging rollers 6 so that as the part 18 to be gauged is moved over it the platform 12 is depressed to the necessary extent for the threads on the part 18 correctly to engage the ribs or threads on the rollers. Each roller is mounted on an eccentric to provide adjustment of the gauging distance and each roller has a slight axial movement against the action of a spring. The pieces 18 to be gauged are heaped on a base 2 between inclined ribs 20 along which spring strips 19 are adjustable to form a gate. The pieces 18 are passed one at a time through the gate and presented to " go " rollers 6. If too big the piece 18 is passed out at 22. If the "go" rollers are passed the piece is presented to the " no go " rollers 8. If too small the piece passes through the gauge and to the exit 26. If correct, the piece is passed out at 30. The platforms 12 are connected by a yoke between which are bolts attached to the base are springs.
Patent GB-359347-A (GB)
Title: Improvements in electric transformers
IPC: H01F27/40
Filed: 1931-02-19
Abstract: 359,347. Transformers. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Assignees of Patent-Treuhand Ges. fur Elektrische Gl³hlampen; 11, Ehrenbergstrasse, Berlin.) Feb. 19, 1931, No. 5291. Convention date, April 16, 1930. [Class 38 (ii).] The primary winding f of a high reactance transformer for supplying a luminous discharge tube is connected to terminals g on one end wall of a twopart casing between the parts of which the core c is clamped, whilst the ends of the secondary winding j are brought out through the opposite end wall of the casing for direct connection to the luminous discharge tube within the box-shaped shield of which the transformer is housed. The transformer casing may be filled with sealing compounds to secure the windings in position on the core. Specification 26933A/06, [Class 38 (ii), Electric currents, Converting &c.], is referred to.
Patent GB-563714-A (GB)
Title: Improvements in or relating to the sealing and/or lining of containers
IPC: C08L91/06
Filed: 1942-04-21
Abstract: A sealing and lining composition for containers comprises a polymerized methacrylate, a bitumen or pitch, a resin, a wax and a solvent, the proportion of polymer being greater than that of the bitumen or pitch, resin and wax together.  Polymers specified are ethyl, n-propyl, isopropyl, isobutyl, and tert-amyl polymethacrylates.  Suitable waxes are paraffin wax and Utah wax. The resin may be colophony or a coumarone-indene resin.  The bitumen or pitch may be coniferous or bituminous pitch, petroleum pitch or Gilsonite (Registered Trade Mark), tabbyite or wurtzellite.  Suitable solvents are benzene, toluene, xylene, chloroform, carbon tetrachloride, ethylene dichloride or aromatic petroleum spirit. Rosin oil and butyl stearate and a dye may be added.  The composition may be supplied to the peripheral sealing groove of a metal can end heated to drive off the solvent.  The whole of the can end and the interior walls of the container may also be coated.  After forming the joint between the can end and the body by the usual seaming operation, the joint is heated at 185 DEG -425 DEG  F. to cause the composition to flow and cement the metal folds together.
Patent GB-1275511-A (GB)
Title: Improvements in and relating to windows
Inventor: JEPPESEN BENT JENSEN
IPC: E06B3/54
Filed: 1970-02-04
Abstract: 1275511 Imitation leaded lights B J JEPPESEN 4 Feb 1970 [7 Feb 1969] 5404/70 Headings E1J and E1R In an imitation leaded light the H-section came 2 is provided at the bottom of the channel 8 to receive the marginal edge of a piece of glass &c with a recess 9 which is adapted to interlock with a ridge 10 on the marginal edge portion of the piece 1. The strips also may be of plastics with sufficient resiliency to allow the ridge 10 to be pushed home into the recess 9. The junctions of the various frame members may be of _I_, L or K formation with junction members corresponding, and have pins at their ends which are received into holes 6 in the cames. The ridge 10 may be interrupted into spaced lengths, and is absent as regards the piece fitting into a plain groove in the junction members, i.e. without the recesses 9.
Patent GB-1299263-A (GB)
Title: Printing machine blanket cylinder cleaning device
Inventor: GATES ALBERT GEORGE RONALD
IPC: B41F35/06
Filed: 1970-02-04
Abstract: 1299263 Printing machines GESTETNER Ltd 19 April 1971 [4 Feb 1970] 5455/70 Head- B6C The blanket cylinder 1 of a printing machine is cleaned by a roller 2 rotatable about a fixed axis, the shape of the roller being such that as the roller makes one revolution its surface contacts the cylinder 1 for part of the time only. The roller 2 may be D-shaped, or have a gap 2A which also serves for mounting the securing means for a roller cover 44. During normal printing, the gap 2A is adjacent to the cylinder 1 so that there is no contact between the roller and the cylinder. Ratchet wheels 5, 6 on the roller shaft engages pawls 10, 11 carried by arms 8, 9. The ratchet wheel 6 has a circumferential space with no ratchet teeth. During a cleaning operation, arm 8 is actuated by cam means on the shaft of cylinder 1, and the roller 2 rotates intermittently preferably in the same direction as the cylinder, the pawl 11 acting as a retaining pawl. When the gap 2A is adjacent the cylinder 1, the pawl 10 has reached the untoothed part of the ratchet wheel 6 and cleaning is stopped. To start a cleaning operation, arm 9 is operated, e.g. by electromagnetic means after a predetermined number of revolutions of cylinder 1, so as to cause the pawl 11 to rotate the ratchet wheels 5, 6 and roller 2 until the pawl 10 can again engage the teeth of ratchet wheel 6 whereupon the roller 1 has imparted thereto a one-revolution wiping rotation. The parts 9, 11 may be dispensed with and means provided for lengthening the stroke of the pawl 10 to cause it to engage teeth when the roller 2 is to be rotated. The roller 2 is partly immersed in cleaning liquid in a trough 3 and may be engaged by a spring-pressed squeegee roller 4. When the liquid falls below a certain level it uncovers an air-hole so as to control the supply of liquid from a reservoir. A wiper blade 45 is provided on the roller 1, and the gap 43 for the blanket-securing means 42 is fitted with an absorbent pad 46 covered by a perforated plate 47. Liquid remaining on the blanket after cleaning is collected by the blade 45 and urged towards the pad 46 where it is first absorbed and then evaporated through the perforated plate 47.
Patent GB-164087-A (GB)
Title: Improved brake for gramophones or talking machines
IPC: G11B17/02
Filed: 1920-02-24
Abstract: 164,087. Parr, G. W. Feb. 24, 1920. Applied by springs.-A brake for automatically stopping a gramophone or the like when the tone arm reaches the end of its travel comprises a spring-actuated slidable pin B mounted radially to the turntable D, and normally held away from the edge thereof by a gravity or spring- controlled pivoted block A having a projection engaging in a groove b in the brake pin, the block A being adjustably attached to an upwardly extending bent arm F. This arm, on which is fitted a rubber sleeve f<2>, is raised by the tone-arm when it reaches the end of the record, so as to release the pin B, and allow the spring E to force it against. the edge of the turntable. The end of the block A is split, and adjustably clamped to the arm F by a screw a<1>. The block A may be held in engagement with the brake-pin by gravity, or by a spring. The Provisional Specification describes a modified construction in which the brake pin passes through a hole in the pivoted block.
Patent GB-1422863-A (GB)
Title: Rolling of tube ends
IPC: F28F9/16
Filed: 1973-02-05
Abstract: 1422863 Jointing by tube expanding KOTTHAUS & BUSCH 5 Feb 1973 [4 Feb 1972] 5554/73 Heading B3J The end of a tube 21 is expanded in a bore in a tube plate 22 by subjecting the tube-end to differential rolling along its length. The expanded tube may be a sliding fit in the plate or, in the case of a heat exchanger, fixed therein. A tube of two different materials may be used. The two end zones of a tube-end may be expanded by 10% and the central zone by 20%. Alternatively, four zones may be expanded in increasing steps (III), or the expansion may increase uniformly over the length (IV) or from each end to a central zone (V). A roller-expander for performing the method may have a different adjusting member, e.g. a potentiometer, for controlling the expansion at each of ten zones, The stages may thus be controlled automatically and indicated by illuminating a lamp for each stage. A selector switch may permit selection of the desired combination of stages, and a repeater switch may allow repetition of a stage after reverse running and an adjustment pause at the end of a stage. A simple adjusting member can be moved mechanically as a function of a curve. A recording instrument may record a curve of each operation for purposes of comparison. The operation may be controlled by a computer.
Patent GB-783984-A (GB)
Title: Improvements in or relating to valves for controlling the flow of liquids
Inventor: FRASER JOHN
IPC: F16K31/363
Filed: 1955-02-24
Abstract: 783,984. Fluid-actuated valves. AVERYHARDOLL, Ltd. Nov. 24, 1955 [Feb. 24, 1955], No. 5587/55. Class 135. A valve controlling liquid flow from 21 to 29, comprises a main valve 24 controlled by a pilot valve 36 varying the pressure in a control chamber 27 which tends to close the valve while the pressure upstream of the valve tends to open it, the pilot valve when moved to connect the chamber 27 to the downstream side via passage 37, cutting-off the chamber from the upstream side via passage 34, and means, e.g. the venturi 47, whereby liquid flow through the valve applies suction to the chamber. The pilot valve is initially lifted to open the downstream and close the upstream connection to the control chamber by a crank 42 and shaft 43 connected to a hand lever 52, the latter also setting a flow meter 10 when a hand lever pawl 57 engages a stop 58 on a lever 53 loose on shaft 43 and connected to the meter. The pressure differential across piston 25 opens the main valve, the opening movement being increased by venturi suction applied to the chamber via passage 37. The pilot and main valves may be lowered to stop flow either by the meter acting on the hand lever through the pawl and stop 58 or by movement of the hand lever alone so that the pawl 57 snaps under a stop 59 on lever 53. Specification 737,696 is referred to.
Patent GB-1082048-A (GB)
Title: High frequency electron discharge devices
IPC: H01J23/36
Filed: 1965-02-09
Abstract: 1,082,048. Transit-time tubes; impedance matching. VARIAN ASSOCIATES. Feb. 9, 1965 [Feb. 21, 1964], No. 5642/65. Headings H1D and H1W. A waveguide window, forming a vacuum seal for e.g. a travelling-wave tube, comprises a dielectric block 14 arranged in a rectangular or round waveguide 13 between two E-plane discontinuities 15, 16. The nature of the discontinuities is prescribed partly by the output impedance of the tube and the impedance of the load, which may be a standard waveguide. The dielectric constant of the chosen material for the block, e.g. fused quartz, alumina, beryllia. single-crystal sapphire, is used to determine its axial length which is made to approximate an electrical length of n# g /2 where # g  is the guide wavelength at the centre frequency of the pass-band. The aspect ratio of the block and hence the dimensions of guide section B are then chosen to give the maximum band-width consistent with mode-free operation, using known techniques. The best position of the window with respect to the position of one of the discontinuities (the position of the other meanwhile remaining arbitrary) is then determined experimentally using VSWR measurements to plot the admittance function of the window on a Smith chart. The desired shape of the plot is one which can be moved to circle the origin by the addition of the other E-plane discontinuity on the other side of the window. Details of the procedure are described and illustrated in the Specification. The discontinuities are not necessarily on the same broad face of the waveguide and each discontinuity may be distributed between opposite faces. An inductive iris 18 may be added.