baber/WOPTO huggingface dataset:
Patent GB-684879-A (GB)
Title: Transistor amplifiers having frequency responsive variable gain
IPC: H03F3/191
Filed: 1950-08-25
Abstract: 684,879. Semi-conductor amplifier circuits. RADIO CORPORATION OF AMERICA. Aug. 25, 1950 [Aug. 31, 1949], No. 21089/50. Class 40 (vi). A transistor amplifier circuit comprises an input circuit connected between the base electrode and a common point of reference potential, and an output circuit between the collector and the common point, and a frequency variable impedance connected in series with the emitter and/or the base electrode such that the power gain characteristic of the circuit is a function of the frequency response characteristic of the impedance. The invention relates to transistors having a collector-emitter current gain factor of substantially unity, and it is shown that the voltage gain of the circuits described varies with the impedance in series with the emitter, while the power gain varies with the impedances in series with the emitter and/or the base electrode. Fig. 3 shows an amplifier circuit comprising transistor 20 having emitter 21, collector 22 and base electrode 23, in which the input signal is applied at terminals 37 between the base electrode and ground, and the output is taken from terminals 41 between the collector and ground. In this, and other circuits described, an impedance between the emitter electrode and ground tends to restrict positive feed-back, while an impedance between the base electrode and ground tends to increase the amount of positive feed-back. In Fig. 3, the series resonant circuit 35, 36 provides a low impedance at the resonant frequency and a high impedance at other frequencies, so that the amplifier has a band-pass characteristic giving increased gain at the resonant frequency. Numerous other circuits are described having series or parallel resonant circuits, or single capacitors or inductors, in series with either or both of the base and emitter electrodes, which provide band-pass or band-rejection amplifiers, or amplifiers in which the gain either decreases or increases with frequency. A resonant circuit may also be associated with the collector electrode to narrow the responsive band-width. A further modification provides for parallel tuned circuits in series with the base and the emitter electrodes which are tuned to different resonant frequencies, which provides a band-pass amplifier having a sharp cut-off characteristic on one side of the band. The semi-conductor material may consist of germanium, boron, silicon, tellurium, or selenium, and the emitter and collector electrodes may be on opposite surfaces of a thin wafer of material.
Patent GB-654195-A (GB)
Title: Improvements in or relating to optical projection screens used in television receivers
IPC: G03B21/62
Filed: 1948-08-11
Abstract: 654,195. Projection screens. PHILIPS ELECTRICAL, Ltd. Aug. 11, 1948, No. 21133. Convention date, Aug. 14, 1947. [Class 97 (i)] A translucent screen in a television receiver has a plurality of uniformly distributed lens shaped parts of two kinds, occupying respectively more and less than half the area of the screen and forming divergent light beams with axes inclined respectively at more and less than 70 degrees to the screen surface. The screen shown in cross-section in Fig. 2 has a plane face towards the incident light and on its other face cylindrically curved elements 6 with axes such as M2 in the plane face. Incident beams 10 are concentrated in the viewing angle α. Between the cylindrical elements are elements 7 of triangular section, the faces 9 of which produce total internal reflection, these faces being slightly curved about axes M1 so that an incident beam 8 is reflected into a viewing angle #. In the screen shown in Fig. 3, the lenticulated face towards the incident light has cylindrical elements 6 separated by grooves 11 with slightly concave faces 12 through which the beams 8 are refracted into the viewing angle #. The elements 7 or the grooves 11 may not extend across the full width of the screens. The Specification as open to inspection under Sect. 91 alludes to the construction of reflecting screens. This subject-matter does not appear in the Specification as accepted.
Patent GB-847354-A (GB)
Title: Improvements in or relating to containers for liquids
Inventor: BARNES ALONZO ROY TREVALLON
IPC: F04F1/06
Filed: 1955-06-30
Abstract: 847,354. Dispensing liquids by gaseous pressure. SANKEY & SONS Ltd., J., and BARNES, A. R. T. Oct. 1, 1956 [June 30, 1956; July 9, 1956], Nos. 21177/56 and 21255/56. Divided out of 847,351. Class 102(2). A container for liquid under gaseous pressure and from which the liquid is to be dispensed by the gaseous pressure, has a concave end wall 13 with a central recess 87 in which opens the end of a dip tube 83 leading to an outlet 79 in the other end wall which also has a gas inlet 93 leading to a gas tube 95 opening below the surface of the liquid. The outlet 79 may be in the side wall as described in Specification 847,351. Specifications 449,764, 670,977, 627,399 and 847,353 also are referred to.
Patent GB-181669-A (GB)
Title: Improvements in secateurs, pruning shears and the like
IPC: A01G3/02
Filed: 1921-08-10
Abstract: 181,669. Kohlbrunner & Martenet. June 15, 1921, [Convention date]. Void [Published under Sect. 91 of the Act]. Pivot pins.-The cutting-blades 1, 2 of pruning- shears &c. are pivoted eccentrically to the pivoting-centre 10 of the handles, and are jointed to their respective handles, 6, 7, so that the blades in closing move away from the centre 10. The pivot for the blades may consist of a bolt 3 with a locking-device in the form of a nut 4 with a toothed rim, a finger plate 13 bolted to the blade engaging in a tooth of the nut.
Patent GB-1015259-A (GB)
Title: Composite polymeric insulation for wires and cables
Inventor: DAWSON LESLIE NORMAN
IPC: H01B7/28
Filed: 1963-05-28
Abstract: A composite dielectric covering for electric conductor wires, comprises an inner layer of vulcanized ethylene/propylene rubber composition bonded to an outer layer of a vulcanized chlorosulphonated polyethylene composition. Optionally an additional layer of chlorosulphonated polyethylene may be applied between the wire and the ethylene/propylene rubber layer. The ethylene/propylene rubber may be derived from ethylene and propylene with/without diene, and may comprise a blend with butyl rubber.  In examples the following ingredients are contained in the various layers: whiting, carbon black, clay, red lead, litharge, zinc oxide, titanium dioxide, magnesium oxide, pigments, softeners, paraffin wax and vulcanizing agents.
Patent GB-734923-A (GB)
Title: A remote control mechanism
Inventor: SHARP LEONARD WILLIAM DESCARRI
IPC: G05D3/12
Filed: 1951-09-10
Abstract: 734,923. Stopping shafts in predetermined positions. PLESSEY CO., Ltd. Nov. 26, 1952 [Sept. 10, 1951], No. 21301/51. Class 80 (2). In a remote-control mechanism for two variable controls whose relative positions are to be set according to a predetermined selection, the first control is driven by a follow-up device, controlled from a remote point, to a selected position and actuates a selector device for the second control, which latter is first driven to an extreme position against a spring bias and then released, so that it returns under the spring bias to its selected position. As shown applied to the tuning controls of a radio transmitter or receiver two shafts 15 and 18, Fig. 1, are set in any one of a number of relative positions by a remote selector switch 32, Fig. 5. Setting of this switch energizes an electric motor 1 which drives a cam 6 to oscillate a lever 7 carrying pawls 11 and 16 which drive ratchet wheels 13 and 17 on the shafts 15 and 18 respectively. The shaft 18 is rotated to an extreme position against a coiled leaf spring (not shown) when the driving pawl 16 is disengaged and a locking pawl 19 engaged to hold the shaft from return movement. Meanwhile the shaft 15 is rotated until a position corresponding to the selected switch position is reached when a contact disc 30 on shaft 15 breaks a contact 31 of a follow-up circuit and the motor 1 is stopped. In this position of shaft 15 one of a number of selector levers 34, Fig. 2, falls into a notch of one of a number of cam discs 33 on the shaft. The other end of the selected lever 34 moves into the path of one of a number of stop cams 29 on the shaft 18. A release mechanism 23 operating the locking pawl 19 is then operated to allow the shaft 18 to spring back under the bias of its loading spring until the associated stop cam 29 engages the selected lever 34 and the shaft is stopped in the desired position. On a fresh selection the operative lever 34 is disengaged by the release mechanism 23 operating a bar 38 and the sequence of events is repeated. The cam discs 33 on the shaft 15 and the stop cams 29 on shaft 18 are individually adjustable on their shafts to vary the positions to be selected.
Patent GB-516328-A (GB)
Title: Improvements in apparatus for indicating the level of granular or like material within a container
IPC: G01F23/00
Filed: 1938-07-19
Abstract: 516,328. Shoots and hoppers. ELLIOTT BROS (LONDON), Ltd., and HARBEN, D. C. July 19, 1938, No. 21470. [Class 78 (i)] Apparatus for indicating the level of granular or like material contained in a hopper comprises a chain or other flexible member 1 secured at its upper end to a rod 6 which is urged upwardly by a spring 14 and is connected to a lever 9 secured to a rocking shaft 10 carrying a mercury switch 13. The chain is lowered by the weight or frictional drag of the material and the switch completes or breaks a circuit controlling an indicating or warning device. The circuit may include auxiliary apparatus for causing material to be fed to the hopper.
Patent GB-225272-A (GB)
Title: Improvements in the method of and means for electrically heating a room or building
IPC: F24C7/04
Filed: 1923-08-24
Abstract: 225,272. Grierson, R., and Grierson, Ltd. Aug. 24, 1923. Mirrors; screens, furniture. - Electrically - heated furnishings, such as mirrors, screens, or the like, are provided at the back with a recess a' at the top and bottom of which are arranged insulating bobbins a<2> for supporting a heating wire D. The space between the front of the mirror or screen and the wire, or the whole of the space between the front and the back of the mirror or screen may be packed with slag wool d<1>. An aluminium or other reflector a<5> may be arranged at the back of the mirror.
Patent GB-773491-A (GB)
Title: Process for the manufacture of cerium mischmetal with low contents of iron, silicon, aluminium, copper, lead
Inventor: NEAL GERTRUDE MARIA
IPC: C25C3/36
Filed: 1952-08-27
Abstract: 773,491. Electrolytic mischmetal. POKORNY, E. A. Nov. 18, 1953 [Aug. 27, 1952], No. 21504/52. Class 41. Substantially uncontaminated mischmetal is produced by fusion electrolysis, in crucibles either of iron or steel lined with rare earth oxides and/or thoria instead of alumina or silica to avoid iron, aluminium or silicon contamination or formed of or lined with an iron or nickel alloy having a 20-85 per cent content of one or more of the metals tungsten molybdenum and chromium with a cathode consisting of or coated with a similar alloy, of rare earth halides, preferably chlorides, these halides being prepared, typically from monazite, in known manner so as to remove the bulk of the thorium, silica, and phosphorus impurities as well as alumina and iron, and freed from lead, copper, zinc and iron by electrolysis in similar cells at or preferably just below the decomposition voltage of the rare earth chlorides, the deposited metal impurites, and a small amount of mischmetal being removed by ladling out or pouring off the molten halides.
Patent GB-1507488-A (GB)
Title: Valve spring retainer and valve stem assembly
IPC: F01L3/10
Filed: 1975-05-20
Abstract: 1507488 Valves TEVES-THOMPSON GmbH 20 May 1975 [20 May 1974] 21540/75 Heading F2V A valve stem 10 is locked to a spring retainer 40 by a pair of lock elements 20, 30, each having a radius r 2  less than the radius r 1  of the stem and equal to 0À98-0À995 r 1 . When the elements are mounted on the stem r 2  becomes equal to r 1  and the elastic strain energy in the elements allows them to remain on the stem without any assistance from the retainer 40. The arc circumscribed by each element when it is installed on the stem is equal to 180 degrees less an arc equal to 0À08-0À18 times the radius r 1 .
Patent GB-154352-A (GB)
Title: Improvements in means for preventing or absorbing vibration in apparatus driven from a geared turbine
IPC: F16F15/10
Filed: 1919-09-02
Abstract: 154,352. Morison, D. B. Sept. 2, 1919. Connecting-rods.-The bearing bushes 4 of the connecting- rod 5 through which a turbine drives a pump are supported between laminated plates 4a held in position by bolts 6 with shoulders 7. A limited play is allowed the plates 4a to absorb the vibratory effects, and they are lubricated to keep a film of oil between each pair. The bearing of the driving pin may be provided with whole tubes or segments of tubes or a wrapping of sheet metal under oil pressure.
Patent GB-1522280-A (GB)
Title: Filter medium and method of making same
IPC: B01D39/14
Filed: 1977-05-23
Abstract: 1522280 Filter medium HOLLINGSWORTH & VOSE CO 23 May 1977 [1 June 1976] 21634/77 Heading B1D [Also in Division D2] An air or liquid filter comprises as the filter medium a water-laid web of fibers including at least 70% by wt. of cellulose fibers, the web having a ream wt. of 35- 180 1b per 3000sq. ft. ream, and being impregnated with resin in a pattern at its wire side to a depth from 15-45% of the total thickness of the web, the amount of resin being from 9-15% by wt. of the web, the pattern having first zones free from resin and other zones impregnated with resin, at least one surface dimension of each of the first zones being from 0.1 to 4mm, the total area of the first zones being from 35-60% of the total surface area of the wire side, and the porosity of the impregnated web being from 1-200 CFM per sq. ft. at a pressure drop of 0.5 inch water on a Frazier porosity tester. The filter may be in the form of a pleated filter.
Patent GB-1144172-A (GB)
Title: Improvements in or relating to power plant
Inventor: LOCKETT GEORGE EDWARD
IPC: G21C7/00
Filed: 1965-05-21
Abstract: 1,144,172. Nuclear power plant. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. 17 May, 1966 [21 May, 1965], No. 21740/65. Heading G6C. In a gas turbine nuclear power plant, the reactor, heat exchangers and turbine are mounted within a cylindrical concrete pressure vessel. Helium gas is circulated through the reactor core, 1, and passes directly through the turbocompressor 4, 5, 6 which circulates the gas, and through the power turbine 8 coupled to the alternator 15. The gas is cooled at the compressor stages 4, 5 in the inter-cooler 10 and pre-cooler 12, both of which have a secondary water circuit. From the compressors, the gas flows into a recuperator, 11, and then into the base of the core from the chamber 20a. The recuperator receives the exhaust gas from turbine 8 when heat exchange occurs with the gas flowing to the chamber 20a. The turbine 8 may be shut down in an emergency by a valve connecting the inlet and outlet ducts of the turbine and sensitive to the turbine speed.
Patent GB-270936-A (GB)
Title: Improvements relating to the perforation of cards for statistical or other purposes
Filed: 1926-09-03
Abstract: 270,936. Tauschek, G. Sept. 3, 1926. Selective punching-machines. - In a machine for punching statistical &c. cards, nine punches 6 are mounted in a row within a frame 3 slidable on rods 2. Selected punches are gagged by a plate A attached to a slidable setting lever 9. The punchcarrying bar 4 is depressed by a lever 12 through toggle mechanism 10 and gagged punches perforate the card supported on a base 1. Depression of the lever 12 also releases a pawl of an escapement mechanism 17 to allow the frame 3 to be fed the distance between the card columns by a spring-urged shaft 15. An extra punch 13 with a forked end is used for punching a hole denoting the operation of addition or subtraction. Specification 263,748 is referred to.
Patent GB-391811-A (GB)
Title: Improvements in or relating to knitting mechanisms
IPC: D04B15/00
Filed: 1931-11-03
Abstract: 391,811. Knitting-machines. BRITISH CELANESE, Ltd., 22, Hanover Square, London, KINSELLA, E., PRATT, J. G., and KELSALL, B., c/o British Celanese, Ltd., Spondon, near Derby. Nov. 3,1931, No. 21768/32. Divided on 391,803. [Class 74 (ii).] Thread-guides, needles, sinkers, and other parts of warp or other knitting- machines are held in place by means of light fusible metal such as zinc-cadmium, zinc-aluminium or zinc-magnesium alloy in proportions specified. The elements are conveniently assembled in sections which are then secured to their appropriate bars. Thread guides 17 are connected by fusible metal 20 to a pressed steel plate 18 perforated at 21 to ensure binding. Sinkers 27 are similarly secured and, in addition the tips are run into a body of metal 31. Thread guides, sinkers, and needles may also be secured, by casting, to plates of fusible metal provided with strengthening and positioning ribs. Specifications 331,202, [Class 74 (ii), Knitting &c.], 391,803, 391,806, 391,807, 391,808, and 391,810 are referred to.
Patent GB-208192-A (GB)
Title: Improved device for handling bricks and other building blocks
IPC: E04G21/16
Filed: 1922-08-10
Abstract: 208,192. Lutz, C. T. Aug. 10, 1922. Holding and picking-up tools.-A device, for use in the erection of brick-work &c. consists of jointed arms connected to a centrally disposed handle and provided with claws adapted to be applied to opposite edges of the brick or other building 'block. The device is adapted to hold the block rigidly with respect to the handle so as to lay the block in place and to be removed therefrom without obstruction by adjacent bricks. One form of the device, Figs. 1 and 2, comprises arms f, g provided with claws c for engaging the edges of the brick h, the arms being connected together by a joint b near the claws of the arms f which terminate in a handle a. The arms g may converge as shown by dotted lines and be connected at d so that the brick is gripped at only three points, which is of advantage when the ends of the brick are not exactly parallel. A modification comprises pairs of arms f<1>, g<1>, Fig. 3 connected near their clawed ends by joints b<1> to links i, the free ends of the arms being slotted at m to engage extensions k on the central handle. The handle extensions also engage vertical slots o in plates n secured to the links i. By turning the handle so that projections c thereon engage lateral notches o<1> in the slots o the device may be carried with the arms locked in extended position. The claws c' may be detachable for easy renewal.
Patent GB-664677-A (GB)
Title: Improvements in or relating to apparatus for the production of composite articles ofstrip material and mouldable material
IPC: B29C43/18
Filed: 1949-08-23
Abstract: 664,677. Moulding composite articles of rubber and metal &c. DUNLOP RUBBER CO., Ltd., TROBRIDGE, G. W., and BRIERLEY, P. July 31, 1950 [Aug. 23, 1949], No. 21822/49. Class 87(ii) Composite articles of strip material and mouldable material, e.g. brass and rubber, are produced in a sectional mould 1, 2, containing blades 8 adapted to shear portions of strip material 11 located within a cavity or cavities in the mould and to divide the cavities into compartments 9 upon closure, and a loading chamber (shown completely closed) which is reduced in capacity as the mould closes and forces moulding material into the compartments. The mould is first opened, and lower brass strips 11 placed in position. Then grooved cores 3, Fig. 5, each carrying three slotted blades 8, Fig. 4, are placed with the lower blade-edges resting on the strip. Finally, the upper strips 11 are laid on the upper cutting- edges of the blades and a preform of rubber is positioned on the land 7 beneath the bleeder-holes 10. On closure of the mould, the strips are cut in two by the central blades and their edges trimmed by the outer blades. Rubber, forced into the parts of the cavity unoccupied by the cores 3, bonds on to the brass strips to form the article shown in Fig. 7. The blades may be integral with the mould parts.
Patent GB-1340536-A (GB)
Title: Information storage circuits
IPC: G11C11/414
Filed: 1971-04-19
Abstract: 1340536 Bi-stable circuit WESTERN ELECTRIC CO Inc 19 April 1971 [17 Feb 1970] 21834/71 Heading H3T A bi-stable circuit comprises two transistors 20, 21, cross coupled by two pairs of series connected resistors 28, 31 and 29, 30, at least one of the junctions formed between the resistors in a pair being connected via a resistor 36 and asymmetrically conductive device in series to a digit line 107, the emitters of the two transistors being connected to a voltage line which renders the bi-stable operative or non-operative and the collectors each being connected via a respective resistor to a supply line 101, the values of the resistors 34, 31, 32, 36, 28 being such that the amplitude of signals obtained from the bistable, when reading its contents, is independent of the non-operative or standby power levels. A further asymmetrically conductive device and resistor 37 may be connected to the junction of the other pair of resistors and line 108. The asymmetrically conductive device may be a diode, transistor or apparatus using such components. In an array of bi-stable circuits (Fig. 1, not shown) the lines 107, 108 are digit lines leading to a digit reader and the line 109 a word line. During the non-operative state the word line voltage is high and diodes 105, 106 are reverse-biased to isolate the circuit from the array. Writing into the circuit is effected by lowering the word line voltage and supplying a digit "one" on line 107. Reading out non- destructively is effected by lowering the word line voltage to cause the digit lines to discharge into the circuit. Since one transistor is on, there is a difference in discharges and this is detected by the digit reader (112). Relative values of the resistors are given for optimum performance. In integrated form, the resistors may be the parasitic resistances of the transistors. The bi-stable circuit may also be used in shift-registers, adders and counters.
Patent GB-172680-A (GB)
Title: Improvements in and relating to telephone call registers
IPC: H04M15/10
Filed: 1920-10-25
Abstract: 172,680. Merton, H. B. Oct. 25, 1920. No Patent granted (Sealing fee not paid). Counters giving monetary indications.-A device for recording the monetary value of the number of telephone calls made is characterized by the use of a single bearing-plate a for carrying the necessary gearwheels connecting the valve-recording dials g, h, and by the use of enlarged bearings b, c filled with washers e and flanges d, so that when the nuts f are tightened-up the bearings have a slight degree of axial play and revolve freely. Each call is recorded by depressing 0 a small ratchet-lever (not shown) at the side of the apparatus. The indicating-dials g, h are mounted on their axles by friction only, so that they are readily re-set to zero.