baber/WOPTO huggingface dataset:
Patent GB-815389-A (GB)
Title: Automatic-gain-control system for transistor circuits
IPC: H03G3/30
Filed: 1956-08-13
Abstract: 815,389. Gain control of transistor amplifiers. HAZELTINE CORPORATION. Aug. 13, 1956 [Sept. 19, 1955], No. 24710/56. Class 40 (6). In an automatic gain control system for a multi-stage transistor amplifier the transistors are biased from a constant current source to a point close to the peak of the emitter current/ gain characteristic and the bias current supplied from the source to the first transistor is less than that supplied to any of the other transistors. The Figure shows two I.F. amplifier stages 12, 13 and detector stage 14 of a radio receiver. A resistor 29 supplies a constant current to the emitter circuits of stages 12 and 13 so that they are biased at about point X (Fig. 2) of the emitter current/gain characteristic of the transistors. When the second detector 14 becomes conductive as a result of the presence of a signal part of the current through resistor 29 is diverted to the second detector so that the bias current of the two amplifier transistors are reduced and when the reduction reaches the point Y the gain of the amplifier starts to decrease, the difference in the bias points X and Y providing a delay in the automatic gain control action. Resistor 26 is made larger than 27 so that with increasing signal strength the transistor stage 12 reaches cut-off before 13 and so that the effects of local oscillator voltage in the input circuit of transistor 12 are reduced. If necessary the detector 14 may be provided with a bias supply in the emitter-base circuit. Specification 789,428 is referred to.
Patent GB-865337-A (GB)
Title: Rubbery polymers
IPC: C08F136/06
Filed: 1959-07-20
Abstract: Butadiene-1 : 3 is polymerized using as catlyst R3 Al where R is an alkyl group containing from 1 to 12 carbon atoms, titanium tetrachloride and titanium tetraiodide.  Specified aluminium compounds are the trimethyl, triethyl, tri-isopropyl, tri-n-pentyl, tri-isooctyl, and tri-n-dodecyl derivatives.  The mol ratio of R3A1 to the tetrahalides is in the range 2 : 1 to 100 : 1 whilst that of the chloride to iodide is in the range 0,5 : 1 to 5 : 1.  The reaction may be carried out in the presence of a hydrocarbon diluent e.g. benzene, toluene, xylene, ethyl benzene, propane, n-butane, n-pentane, isopentane, n-hexane, isohexane, isooctane, n-decane, cyclohexane, methylcyclohexane and their mixtures, under autogeneous pressure at -100 DEG  to 175 DEG F.ALSO:A butadiene polymerization catalyst mixture comprises R3Al, where R is an alkyl group containing 1 to 12 carbon atoms, titanium tetrachloride and titanium tetraiodide. Specified aluminium compounds are the trimethyl, triethyl, tri-isopropyl, tri-n-pentyl, tri-iso-octyl, and tri-n-dodecyl derivatives.  The mole ratio of R3Al to the chloride and to the iodide is in the range 2:1 to 100:1, whilst that of the chloride to the iodide is in the range 0.5:1 to 5:1.
Patent GB-481877-A (GB)
Title: Improvements in or relating to stretchers for invalids
IPC: A61G1/04
Filed: 1936-09-12
Abstract: 481,877. Ambulance litters. WILSON & STOCKALL, Ltd., and TAYLOR, J. Sept. 12, 1936, No. 24878. [Class 108 (i)] A stretcher of the kind comprising pivoted head, central and foot sections is provided with quadrant and worm adjustment for struts supporting the central and foot sections. The head section 9 is pivoted to the side longitudinals at 10 and is supported in adjusted position by an adjustable strut 15a, 15b having a toothed quadrant 16 engaged by a spring pawl 17. The centre and foot sections 11, 13 are hinged together at 14 and to the longitudinals 6 at 12. Struts 24, 25 pivoted at 26, 27 are provided with rollers 30, 31 adapted to bear on the underside of the sections 11, 13 and at the other ends are provided with quadrants 28, 29 operable by worms 34, 35 on shafts 36, 37 having handles 42 &c. The handles 7 of the longitudinals 6 may be provided with metal caps having a rectangular aperture in the end thereof so that they may be engaged by catches on the ends of spindles 45, Fig. 3, rotatable by levers 50 and handles 51 mounted on the bulkhead of an ambulance to secure the stretcher in position on an ambulance.
Patent GB-248877-A (GB)
Abstract: 248,877. Fryer, F. G. Jan 7, 1925. Disc mills. - In apparatus for reducing or refining chocolate &c. and of the kind comprising relatively rotatable metal discs yieldingly pressed together, the discs are provided with pockets which vary in depth. Preferably the depth of the pockets decreases progressively from the central pockets to the outermost pockets. Fig. 1 shows a sector 1 of a grinding-disc with concentric sinusoidal or zig-zag rings 2 between annular rows of pockets 3 slightly inclined from the radial in the direction of rotation of the disc. The sectors 1 are castings for securing to a backing-plate as described in Specification 237,645. Figs. 2 and 4 are sections on the lines A-A, and C-C respectively of Fig. 1. When the walls 31 between adjacent pockets in a row have the known saw-tooth cross-section, the bottom surfaces of the inner pockets 3, Fig. 4, will slant with greater inclination to the plane of the disc than those of the outer pockets 3, Fig. 2. Instead of pockets, ring-formed grooves may be provided between the rings 2.
Patent GB-1114742-A (GB)
Title: Circuit arrangement for producing a pulse train
IPC: H03K5/00
Filed: 1965-06-11
Abstract: 1,114,742. Electronic counters. TELEFONAKTIEBOLAGET L. M. ERICSSON. 11 June, 1965 [12 June, 1964], No. 24898/65. Heading G4A. Two AND gates A, B, responsive to specific conditions of a binary counter driven by a pulse source OC, start and stop a generator PG to provide a clearly-defined pulse signal. As shown, OC drives a trigger TG which produces output signals on leads 0 and 1 alternately, the 0 outputs feeding a binary cascade counter with stages M1-M3. AND gate A responds to the combination of a zero reading on the counter and 1 from TG to start a pulse from PG. AND gate B responds to a reading of 3 from the counter and 1 from TG to terminate the pulse. The use of 1 from TG defines the beginning and end of the pulse sharply. The pattern repeats when the counter next reaches zero.
Patent GB-389477-A (GB)
Title: Improvements in or relating to the impregnation of di-electric materials
IPC: H01B13/30
Filed: 1931-09-05
Abstract: 389,477. Impregnating cables &c. GENERAL ENGINEERING CO. (RADCLIFFE), Ltd. and TAYLOR, S., Station Works, Bury Road, Radcliffe, near Manchester. Sept. 5, 1931, No. 24950. [Class 36.] In the impregnation of electric cables and other dielectric materials, the material is supported in an impregnating-vessel in which it is immersed in an impregnating-composition which is free to circulate in the vessel, the material after impregnation being removed from the vessel while still immersed in the composition. As shown in Fig. 1, the material is supported in the vessel in trays a each having one or more apertures b at the bottom normally closed by a spring-loaded valve c. The valves c have extensions d which, when the trays are arranged in the vessel, engage lugs e on the trays below or, in the case of the bottom tray, a lug g secured to the wall of the vessel. The apertures b are thus held open, permitting the impregnating composition to circulate, when the trays are arranged in the vessel, but close as the trays are withdrawn. As shown in Fig. 2, each tray has a circular valve plate h adapted to uncover or cover holes i in the .tray, for the purposes described above, and operated by flexible-cable mechanism j against a return spring m. The flexible cable k is detachably secured to a lug l on the underside of the tray, and passes through a gland in the wall of the vessel ; with this construction, the circulation of the composition can be controlled during the impregnation. The flexible-cable mechanism may be replaced by electromagnetic operating means. A further construction is described in which each tray carries an electrically operated slide valve or valves each connected by a flexible cable to a plug coupling in'the wall of the vessel.
Patent GB-215656-A (GB)
Title: Improvements in the construction of hard tennis courts
IPC: E01C13/06
Filed: 1923-10-08
Abstract: 215,656. Burrough, W. G., and Withers, W. R. Oct. 8, 1923. Monolithic flooring.-Hard tennis courts of the kind having a. foundation layer of clinker and a superimposed layer of reinforced concrete, are provided with a top finishing layer composed of wood dust, colouring material such as ferric oxide powder, limestone grit, sand, Portland cement and water. The proportions of the materials used for the upper layer are as follows:- 4 lbs. of wood dust, 30 lbs. of ferric oxide powder, 56 lbs. of sand, 112 lbs. of cement, and 168 lbs. of limestone grit. The lines of the court are made of white marble inlaid in the plastic mass.
Patent GB-1038292-A (GB)
Title: Automatic control circuit of television receivers
IPC: H04N5/53
Filed: 1963-06-24
Abstract: 1,038,292. Automatic frequency and gain control. SONY CORPORATION. June 24, 1963 [June 25, 1962], No. 25028/63. Headings H3A and H3Q. In an automatic gain control or automatic frequency control arrangement for a television receiver, the output of the last I.F. stage 8 of the receiver is coupled via coils 12a, 12c to an amplifier 26 tuned to the intermediate frequency which only amplifies the synchronizing signal portions of the I.F. signal; for automatic gain control the output of the amplifier is applied to a detector 37 which provides a D.C. signal for controlling the gain of the R.F. and I.F. amplifier circuits 2, 6 and 7 and for automatic frequency control the output of the amplifier is applied to a discriminator (not shown) which provides a D.C. control signal for controlling the frequency of the local oscillator 4. The amplifier may operate in class B or C whereby only the large amplitude synchronizing portions of the I.F. signal are amplified or may derive its power supply from a frame scanning coil 24 via pick-up loop 31 so that the amplifier is gated during the synchronizing signal portions of the I.F. signal.
Patent GB-1503208-A (GB)
Title: Offshore marine structures and methods for the construction thereof
IPC: E02B17/02
Filed: 1975-06-11
Abstract: 1503208 Erecting and installing offshore structures F HANSEN 4 June 1976 [11 June 1975] 25076/75 Heading E1H The tower structure of a marine structure e.g. an offshore platform, comprises three columns 1 rigidly connected together by braces 2, 3 and 4 and feet 5 which, at the installation site are embedded into the material of the water bed by excavating means arranged in the feet 5. The tower structure is constructed and towed to the installation site in a horizontal position with two of the columns 1 and their associated braces 2, 3, 4 providing the required buoyancy which may be supplemented by upper buoyancy tanks 7. At the installation site the tower structure is upended by ballasting and sunk onto the water bed. Fabrication. In one method two columns 1 and their braces are built in a dry dock, floated out and the third column and its associated braces are built afloat on the first part of the tower structure. The feet 5 are then connected as are the buoyancy tanks 7 if required. If the tanks 7 are used the deck and superstructure may be built onto the tower structure before towout, e.g. drilling and production equipment can be installed before tow out provided they can withstand the subsequent upending operation. Alternatively the tower structure may be installed first and the deck and superstructure floated out and jacked up into position. In a second method, the tower structure and the feet 5 are built separately and then both are floated out and connected together before tow out to the installation site. Embedment. In one embodiment (Fig. 6) each foot 5 is conical in shape and contains a suction pipe 11 with a cutter head 12. The cutter head 12 is moved within the head by tackle which runs on an annular track on the inner wall of the foot and is operable by winches on the deck of the structure. (Fig. 8, not shown). In another embodiment (Fig. 18, not shown), two cutter heads and their suction pipes are moved within a foot 5 by a toggle mechanism. Alternatively drag teeth may be operated by the toggle mechanism. After embedment the feet 5 are back filled with granular material e.g. sand or gravel.
Patent GB-721599-A (GB)
Title: Amplifying or controlling tube section for the voltages under comparison in voltage-comparing indicator tubes
IPC: H01J31/14
Filed: 1951-10-26
Abstract: 721,599. Cathode-ray tubes. STANDARD TELEPHONES & CABLES, Ltd. Oct. 26, 1951 [Dec. 27, 1950], No. 25098/51.. Class 39 (1) A voltage indicator contains a luminescent anode grid and cathode voltage control electrodes, and a number of amplifiers arranged at the same distance along the length of the cathode. For an amplifier, the cathode, Fig. 1, of oval or circular cross-section is surrounded by measuring electrodes 2, 3 extending over part of the cathode. Screen grids 8, shaped as metal strips, bars or grids, are used for determining the anode currents, increasing the sensitivity of the control electrodes or for the production 'of a space charge within which the control electrodes are arranged. The anodes of an amplifier are connected to the voltage control electrodes of the indicating electrode assembly. Additional anodes may be provided in the electron path, and the indicator may be suitable for both frequency modulated and amplitude modulated receivers or combined receivers. The grids consist of helical coils or of curved perforated sheets or slotted plates so arranged that the slots of adjacent grids intersect.at 90‹ so that screening of one grid by another is reduced. The plate-shaped grid nearest the cathode is constructed so that parts such as the support rods of these grids are shielded from the electron stream. The screen grids 2, Fig. 2, are formed of rods 8, 9 connected together or formed by a hair-pin shaped rod, and arranged within the measuring grids 2, 3. The rod-shaped measuring grids may be arranged within a screen grid or formed of two pairs of rods 2 ... 5, Fig. 4, each pair connected together and constructed to form a unit. Additional rod-shaped screen grids may be arranged between the pairs 2, 3 and 4, 5. Positive measuring grids which are not shaped are located on diagonals which join opposite ends of segment-shaped balance grids. The anodes 12, 13 of the amplifier shown in Fig. 7 are continued to join the voltage-measuring electrodes of the indicating assembly. Measuring electrodes 2, 3 and a screen grid 8 are provided; in modifications, the electrodes 2, 3, Fig. 7, consist of strips arranged on opposite sides of the cathode 1 or the anodes 12, 13 are shaped as metal strips extended to join the voltage-measuring electrodes, or an additional segment-shaped screen grid is symmetrically arranged between the pair of anodes 12, 13 and the screen grid 8. The positive potential on the anode 14, Fig. 11, is adjustable so that a larger electron flow to the anodes 12, 17 is obtained. A screen grid 8 is provided; in modifications, the anode 14 is a rod arranged between the anodes 12, 17 or the anodes 12, 11, and control electrodes 2, 3 are formed of strips, the anode 14 being dispensed with, or a rod-shaped additional anode is fitted between inclined strip anodes 12, 17, arcuate control electrodes 2, 3 surrounding the cathode 1. Specification 703,660 is referred to.
Patent GB-1084936-A (GB)
Title: Electrorefining of plutonium
IPC: C25C3/34
Filed: 1966-06-06
Abstract: <PICT:1084936/C6-C7/1> A process for electro-refining plutonium comprises melting in contact with impure Pu, to form an electrolyte and molten Pu, a mixture including MgCl2 with NaCl and KCl, maintaining the melted electrolyte and molten Pu at 700 DEG  C. to 830 DEG  C. and simultaneously stirring the same for a period of from 30 to 120 minutes to acquire a supply of Pu ions in the melted electrolyte, and thereafter initiating electrolysis through the electrolyte using the molten impure Pu as the anode.  The electrolyte may contain 2.5 to 9.8 weight per cent MgCl2 and equimolar proportions of NaCl and KCl. Electrolysis may be at 10 to 40 amperes D.C. and may be in an inert atmosphere, e.g. of argon at 3 p.s.i.g. The electro-refined Pu may be vacuum cast.  Prior to the electro-refining there may be a pre-electrolysis step in which current is passed in the reverse direction to remove traces of impurities from the electrolyte such as Fe, Si and Cu.  The process is carried out within a crucible 72, Fig. 3, which is housed within a furnace assembly (12), Fig. 1 (not shown) electrically heated by a coil (16) and having a lid which is hinged at (61) and cooled by coolant tubing (67). Fig. 3 shows a tungsten cathode assembly 82 and a molten impure Pu charge 80 electrically connected as anode by an anode shoe 93 at the end of an electrically insulated connecting rod 90.  A stirring assembly 98 with a MgO tip 100 stirs both the molten impure Pu 80 and fused salt electrolyte 81.  During the electro-refining, refined Pu 84 collects between two crucibles 73, 74.  The cathode assembly, anode connecting rod and stirrer can all be retracted when not required.  They are secured by clamping devices (95, 99), Fig. 1 (not shown).
Patent GB-782611-A (GB)
Title: Improvements in or relating to vehicle headlights
IPC: F21V11/16
Filed: 1955-09-01
Abstract: 782,611. Vehicle lamps. SCHENK, C. Sept. 1, 1955 [Sept. 3, 1954], No. 25153/55. Classes 75(2) and 75(4) A vehicle headlight comprises a concave reflector 1 at the rear of a lamp 7, a diffusing disc 8 in front of the lamp having on its rear face horizontal cylindrical contiguous converging lenses 2 and a set of vanes 4 spaced the widths of the lenses and disposed parallel to the lenses with their front edges adjacent thereto and their rear edges coinciding with the focal plane thereof. The widths of the lenses may be different. The optical axis of a lens need not be parallel to the axis of the headlight. The vanes are inclined downwardly from their rear edges. The front face of the diffusing disc 8 is provided with contiguous vertical cylindrical lenses 3 which may be convex or concave or alternating convex and concave.
Patent GB-615075-A (GB)
Title: A seedling transplanter
IPC: A01G23/02
Filed: 1946-08-23
Abstract: 615,075. Hand planting . tools. COLLINSON, P. Aug. 23, 1946, No. 25154. [Class 6 (ii)] A seedling transplanter consists of a handle of wood or synthetic resin enclosing the stem of a dibber 2. The other end of the stem is slit to receive a soil-loosening blade or fork 3.
Patent GB-982841-A (GB)
Title: A terminal for a flat flexible cable
Inventor: DAHLGREN VICTOR FRITZ
IPC: H01R11/12
Filed: 1961-07-12
Abstract: 982,841. Flat strip cables. SANDERS ASSOCIATES Inc. July 12, 1961, No. 25207/61. Heading H1A. [Also in Division H2] A connector cable for a printed circuit (Fig. 3) comprises a flat flexible cupric oxide (19) and plastics (20) insulated cable 10 having a conductor 11 embedded therein with a terminal 12 formed at one shaped end by removing portions of the insulation so as to leave an exposed area. The conductor is of copper chemically coated with cupric oxide and the plastics insulation is preferably P.T.F.C.E. In a modification (Fig. 5) for high voltage applications the conductor 11 has a coating of cupric oxide and is encapsulated in laminations of plastics 20; the terminal being formed of a frusto-conical cavity in the plastics exposing the conductor and may be of the shape shown in Fig. 3. An application of the cable to a lampholder (see Division H2) is also described (Fig. 1, not shown).
Patent GB-961227-A (GB)
Title: Improvements in or relating to image reproduction systems
Inventor: MAWBY DAVID HARRY
IPC: G03F3/08
Filed: 1961-07-12
Abstract: 961,227. Electric analogue calculating. CROSSFIELDS ELECTRONICS Ltd. July 4, 1962 [July 12, 1961], No. 25250/61. Heading G4G. [Also in Division H4] Computer units utilizing difference circuits, biased diode amplitude selectors, diode maximum and minimum signal selectors and resistor adding circuits in various combination are utilised in colour reproduction apparatus (see Division H4) to derive colour and tone correction signals. A typical unit is illustrated in Fig. 5 where a signal from a photomultiplier 26 BK is inverted in a circuit 41 and then added (so as to produce the difference) to the instantaneous maximum, selected by diodes 67, of three signals from photomultipliers 26B, 26R and 26G. The resulting difference signal passes through cathode followers and a biased diode to a resistance adding circuit 48 where it is combined with preselected proportions of the signals from photomultipliers 26B, 26R and 26G. Specifications 835, 111, 912,553, 913,050 and 934,108 are referred to.
Patent GB-1305865-A (GB)
IPC: H01P5/12
Filed: 1971-04-19
Abstract: 1305865 Matching impedances SPERRY RAND CORP 19 April 1971 [27 March 1970] 25350/71 Heading H1W [Also in Division H3] A transmission-line coupling circuit comprises a pair of transmission-line elements 3, 3a, each varying in impedance from a magnitude Z 0  at one end (A or B) to a magnitude Z L  = 2Z 0  at the other end C where they are coupled to a trunk line 5 of impedance Z 0 . It is shown in the Specification that such an arrangement produces substantially reflectionless combination of two impulse signals transmitted simultaneously from the ends A and B. The trunk line 5 may vary in impedance from Z 0  at the end C (shown) to a remote end (not shown) of empedance Z L  = 2Z 0 ; i.e. it may be identical to the line elements 3, 3a. Such an arrangement forms the basis of a ramified system having 2<SP>n</SP> inputs coupled in pairs to 2<SP>n-1</SP> trunks which are again coupled in pairs, and so on through n stages to a single output. This circuit may be used for combining coherent pulse signals fed to the inputs through directional couplers spaced along a transmission line (Fig. 3, not shown). In order to avoid dispersion, the length of each line element is great compared to the product of the impulse duration and the speed of light.
Patent GB-282009-A (GB)
Title: Apparatus for producing rontgen rays
IPC: H05G1/06
Filed: 1927-09-26
Abstract: 282,009. Siemens -- Reiniger Veifa. Ges. f³r Medizinische Technik. Dec. 8, 1926, [Convention date]. R÷ntgen-ray apparatus.-For safety purposes, the tube and the high tension lead are enclosed in a vertically supported earthed sheath made in one or more parts extending to a point out of reach. The tube itself is provided with an adjustable window. In one construction of suspension device, the supply transformer casing a is fixed to the ceiling, the high tension tube d being suspended by a ball and socket or other universal joint b. The tube d is encased in an insulating tube e outside which is an earthed metal sheath f surrounding the tube c and impenetrable to rays except through a window slit or opening. The suspension device is preferably telescopic. The tube has an enlarged cooling stem g, extending within the tube d, which may be hollow. In an alternative construction, the casing a is mounted on a wall and the joint b is at the end of an horizontal arm. In a further alternative, the transformer casing may be mounted on the ground with a hollow upright pillar from which an horizontal extensible and jointed arm projects at the end of which is a tubular socket through which the upright sheath f is passed and supported, this arrangement providing for an adjustment of the suspension arrangement about a vertical axis. The casing f may have a cover slide o, Fig. 5, provided with a window n and movable in a guide m which is preferably spaced from the casing to allow for air circulation. The slide o may be rigidly connected and movable with a diaphragm tube p.