baber/WOPTO huggingface dataset:
Patent GB-1395093-A (GB)
Title: Laser oscillator for producing band-width-limited pulses
IPC: G02F1/03
Filed: 1973-01-26
Abstract: 1395093 Lasers UNITED STATES ATOMIC ENERGY COMMISSION 26 Jan 1973 [15 Feb 1972] 3964/73 Heading H1C [Also in Division H4] Bandwidth limited pulses, i.e. pulses of spatial extent less than the resonator length, are produced in a laser by providing a polarizer 13, Fig. 1, a quarter wave plate 14 and a Pockels' cell 15, in that order, between the active medium 11 and one of the resonator reflectors 17, 18, the laser being normally maintained in the low Q condition by biasing the Pockels' cell with its half wave retardation potential 19, and being switched through a transient high Q condition to a further low Q condition when the cell is changed to the zero retardation state by shorting it to ground at switch 21. Mode locking may be improved or stabilized by a dye cell 16. Operation is explained with reference to Figs. 2 to 4, the active medium being optically-pumped ruby, Nd, YAG, Nd glass, CO 2  or an organic dye, the polarizer 13 being a calcite prism and the quarter wave plate formed of quartz. Fig. 2 shows the optical conditions obtained when the Pockels' cell is biased with its half wave retardation potential, the radiation from the active medium 11 being plane polarized by the prism 13 at 22, and then converted to circular polarization 23 by the quarter wave plate. This radiation is then acted upon by the various components 15 and 13 in the remainder of its passage back to the prism such that it is finally plane polarized 27 in a sense as to be suppressed by this prism. The same final outcome of a plane polarized reflected beam suppressed by the prism 13 is obtained in Fig. 4, in which the Pockels' cell has a zero bias potential and consequential zero retardation. When the biased Pockels' cell is grounded it transitorily passes through the quarter wave retardation condition, shown in Fig. 3, in which the reflected beam 31 incident on the prism is plane polarized, but orthogonal to the polarization 27 obtained at this point in the case of half wave retardation bias and zero bias shown in Figs. 2 and 4. Accordingly the beam 31 passes through the prism and active medium to a partially transmitting output reflector 17. Thus an output pulse is obtained during the transitional bias period having a symmetrically decreasing gain characteristic on each side of a central maximum. Longitudinal mode selection is effected by using either multi-plate resonantly-reflective etalons for the reflectors or the combination of one such plate with a grating. It is suggested that a similar and additional optical switching arrangement be provided externally of the laser resonator, Fig. 7, the arrangement comprising, for a single beam pass, the combination of two polarizing prisms 37, 38 and two Pockels' cells 35, 36 biased and controlled as previously described.
Patent GB-321124-A (GB)
Title: Improvements in or relating to electric lamps for the production of ultra violet rays
IPC: H01J13/00
Filed: 1929-02-06
Abstract: 321,124. Verschoyle, W. D. Feb. 6,. 1929. Addition to 312,591. Metallic-vapour apparatus.-A lamp as described in the parent Specification is fitted with a series resistance. In the arrangement shown, the capillary tube a is formed with two enlargements c forming mercury reservoirs and an expansion chamber f. Into the reservoirs c through the end portions b of the tube pass tungsten wires d connected to resistance coils g contained in the enlarged ends of the tube and connected to the terminals of a lamp cap k.
Patent GB-1405847-A (GB)
Title: Dual thrust level monopropellant spacecraft propulsion system
IPC: F02K9/44
Filed: 1973-01-26
Abstract: 1405847 Rocket propulsion systems for spacecraft RCA CORPORATION 26 Jan 1973 [31 Jan 1972] 4011/73 Heading F1J The invention relates to an auxiliary propulsion system for a spacecraft which utilizes decomposition gases of a liquid monopropellant and which is adapted to provide either relatively high level thrust or relatively low level thrust. The system shown in Fig. 1 comprises a container 10 for monopropellant such as hydrazine N 2 H 4 , the container being pressurized by gas such as nitrogen in container 22. The hydrazine passes under control of valve 34 either to relatively high level thrusters 14 or to relatively low level thrusters 16. A thruster 14 is shown in Fig. 2 and comprises a cylindrical casing 60 and thrust nozzle 52, hydrazine being supplied through injectors 61 to a catalyst bed 46, the decomposition gases passing to chamber 48 and thence discharging through nozzle 52 to ambient space 56. A thruster 16 is shown in Fig. 3 and is generally similar to thruster 14 in that it comprises catalyst bed 46, decomposition gas chamber 48, a hydrazine injector 40 and a thrust nozzle 52; it is also provided with an electric heating coil 58 disposed around the decomposition gas chamber 48, the coil being enclosed within a layer of insulation 60. A single thruster 62, Fig. 4, may be provided to provide both high and low level thrusts, in place of two thrusters 14 and 16. The thruster 62 is similar to the thruster 16 shown in Fig. 3 having an electric heating coil 58 disposed around the decomposition gas chamber 48. It is also provided with a means 65 for varying the area of the nozzle throat 64.
Patent GB-118393-A (GB)
Title: Improvements in Circuit-breakers for Ignition Magnetos.
Filed: 1918-03-07
Abstract: 118,393. Labrosse & Esteve. Sept. 6, 1917, [Convention date]. Rotary interrupters.-In interrupters for ignition magnetos the axle a of contact-carrying lever b is surrounded by a metal bush c insulated from the interrupter disk by a fibre sleeve f and washer g. The cam bowl h of fibre &c. has a metal bush i for mounting on its pivot. The spring is connected to the end of the lever b remote from its pivot.
Patent GB-1287532-A (GB)
Title: Pharmaceutical compositons
Inventor: KUNA SAMUEL
Filed: 1971-02-05
Abstract: 1287532 Compositions comprising salicylamide MERCK & CO Inc 5 Feb 1971 4070/71 Heading A5B A pharmaceutical preparation for inducing drowsiness in insomniac persons comprises an orally administrable pharmaceutical carrier, diluent or coating, from 160-2600 mg. of salicylamide and from one third to an equal weight of glyceryl guaiacolate.
Patent GB-344176-A (GB)
Title: Improvements in electrically insulating joints
IPC: H02G15/115
Filed: 1930-02-07
Abstract: 344,176. Cables ; joints. ELLIS, R. E., 70, Chancery Lane, London.-(Engineering Products Corporation, Inc. ; 25, Church Street, New York, U.S.A.) Feb. 7, 1930, No. 4252. [Classes 36 and 38 (i).] In order to reduce the sheathing losses in an alternating-current cable, the lead sheath is divided into short sections by insulating joints which are preferably oil-filled. In the construction shown, the insulating joint comprises tubular metal sections 1 formed with interlocking teeth 2, the sections being out of contact with each other and connected by a ring of insulating material 6. In order to provide a rigid joint between the sections 1 and the insulating ring 6, the ends 4 of the teeth 2 may be bent outwards and a series of annular grooves 5 may be formed behind the teeth. The ring 6 may be formed of a plastic material moulded and pressed into shape, suitable materials being known under the registered Trade Marks "Bakelite," " Micanite " and "Colasta." The sections 1 are connected to the lead sheath 10 of a cable by a lead sleeve 11 provided with a filling plug 16.
Patent GB-468827-A (GB)
Title: Improvements in or relating to stators for alternating current machines
IPC: H02K1/16
Filed: 1937-02-12
Abstract: 468,827. Conductors for dynamo - electric machines. SIEMENS - SCHUCKERTWERKE AKT.-GES. Feb. 12, 1937, No. 4267. Convention date, Feb. 12, 1936. [Class 35] The circular stator conductors of an alternating-current machine disposed one behind the other in a slot have insulation which increases in thickness from the slot mouth outwards away from the stator bore. In the form shown, the highest potential conductor a<3> is disposed in the bottom of the slot with the greatest thickness of insulation i<3> and the lowest potential conductor a<1> is nearest the stator bore b.
Patent GB-1361768-A (GB)
Title: Pipe couplings
IPC: F16L47/10
Filed: 1973-01-27
Abstract: 1361768 Pipe couplings HEPWORTH PLASTICS Ltd 27 Jan 1973 4283/73 Heading F2G In an 0-ring sealed plastics pipe coupling socket, a snap-on retaining ring 8 has an inwardly projecting annular flange 12. The flange 12 is preferably backed by gussets 14.
Patent GB-1061089-A (GB)
Title: Improvements in and relating to stands for receptacles, such as a baby's bath or cot
Inventor: ZILKHA SELIM KHEDOUR
IPC: A47K3/164
Filed: 1965-02-01
Abstract: 1,061,089. Folding stands for cots. MOTHERCARE Ltd. Jan. 24, 1966 [Feb. 1, 1965], No. 4300/65. Heading A4H. A stand for a cot comprises two inverted U-shaped legs 1, 2 pivoted at the mid points of their sides and held in open position by an H-frame 6, 7, 8 pivoted to a cross bar 4 on one of the U-shaped legs and provided with end hooks 10 for engaging a further cross bar 5 on the other U-shaped leg. Additional hooks 11 on the frame determine a second alternative setting of the legs. Two pairs of articulated links 12, 13 and 14, 15 are pivoted at their free ends to the legs 1, 2 and assume a triangular position when the stand is open. The frame 6, 7, 8 may be swung out of use and the articulated links used to hold the legs in a further splayed out position.
Patent GB-828582-A (GB)
Title: Improvements in or relating to folding trailers
IPC: B60P9/00
Filed: 1958-02-11
Abstract: 828,582. Foldable vehicles. LASSEN, H. Feb. 11, 1958 [July 19, 1957], No. 4466/58. Class 108(1) A foldable trailer has a main cross beam 1 to the ends of which are secured side girders 2 foldable inwardly about the joints 8. The floor comprises panels 3 having flanges 4 and they may be collapsed into overlapping relation adjacent the beam 1 by moving the rear cross beam 6 forwardly. The wheeled axle is supported on brackets 9 slidable along the side girders 2. When the floor is collapsed the brackets 9 are slid forwardly to enable the rear ends of the side girders 2 to be folded inwardly.
Patent GB-1178941-A (GB)
Title: Improvements in the Surface Finishing of Aerated Concrete
Inventor: JARUND ROLF
IPC: C04B41/50
Filed: 1968-01-29
Abstract: 1,178,941. Moulding aerated concrete. YTONG INTERNATIONAL A.B. 29 Jan., 1968 [31 Jan., 1967], No. 4510/68. Heading B5A. [Also in Division B2] Aerated concrete products, which are cast from mixed materials containing lime and silicic acid with water which is made porous by adding a foaming agent, are provided with a surface dressing of partially embedded mineral grains, e.g. gravel, applied prior to steam curing and which are applied by a compressed air spray as the spray nozzle and the surface are relatively displaced so that 40-60% of the surface is covered by the grains. Circular grains are preferred and 30-70% of the surface of the grains is embedded within the concrete and, after steam curing, the dressed surface may be coated with a translucent or transparent plastics or a lacquer, e.g. an aqueous acrylic dispersion, providing a water repellent surface. The finished products may be employed as floor, roof, or external wall units, masonry blocks, partition wall units, lintels or large panels or as sandwich elements enclosing a core of cellular plastics.
Patent GB-1037636-A (GB)
Title: Improvements in or relating to tape recorders
IPC: G11B15/62
Filed: 1963-02-04
Abstract: 1,037,636. Reversible drive for record tapes S. KAWAUCHI. Feb. 4, 1963, No. 4539/63. Heading G5R. A reversible D.C. motor is provided with coupling means responsive to the direction of drive whereby the motor is coupled to a take-up spool or to a capstan for normal forward drive or to a feed spool for re-wind. In Fig. 1 the variable-speed motor M is universally mounted on fixed supports 6 and 7 and the ends 1 and 2 of its shaft are adapted to engage rubber rings 10a and 11a on take-up and supply reel supports. When the motor is driven forward the reaction on the shaft tends to rotate the motor so that the end 1 of the shaft engages the take-up reel support 10, and a brake pad 13 mounted on a spring 12 bears on the support. As tape is wound on to the take-up reel the load on the motor increases and the pressure on brake 13 is thereby increased so that the linear tape speed is held constant. When the motor is reversed the end 2 of its shaft engages reel support 11 to re-wind the tape. Local and remote controls may be provided for the motor, Fig. 3 (not shown). In a modification, Fig. 4 (not shown), a constant-speed motor drives a capstan in its forward drive mode, a belt drive being provided between the capstan and the take-up reel.
Patent GB-822179-A (GB)
Title: Improvements in or relating to four-wheeled tractors
Inventor: SPIEGEL ERWIN
IPC: A01B51/02
Filed: 1956-02-15
Abstract: 822,179. Tractors. STEYR-DAIMLERPUCH A.G. Feb. 15, 1956, No. 4763/56. Classes 79(1) and 79(4) In a four-wheeled tractor having two units of the chassis connected by a central longitudinal member 1, the front unit comprising an axle structure carrying the engine 2 and clutch and the rear unit b comprising the final drive gearing, the rear axle structure, control mechanisms and the driver's seat, a portion 6 of the front axle structure secured to the clutch housing 5 is disposed above the level of the main drive shaft connecting the clutch to the final drive gearing, a load carrying platform 39 being mounted above the longitudinal member 1. As shown the front axle portion 6 is rotatably mounted on a 'cylindrical portion of the housing 5, the portion 6 being connected to tubes 7 carrying king pins 11 supported on axles 9 by the front wheels 10, and the wheels 10. being each connected by links 12, 13 to a steering gear housed in a member 44 and controlled by a steering column 14. Alternatively the member 1 may be rotatably connected to the rear axle unit b with the front axle portion 6 secured to the housing 5 or the member 1 may be flexed torsionally. The unit b may be provided with power take-off shafts 37, 38. Power lift mechanisms. A link system may be provided between the axles and another behind the rear axle. The interaxle link system comprises an upper link 15 and lower links 16 interconnected by a rod 17 to which are secured chains 25 passing over rollers 26 to a crosshead 24 actuated by a hydraulic cylinder 21 which is under the control of a pedal 22 and connectible to a hydraulic reservoir disposed in the member 1. When the system carries a mower beam, the latter can be driven by a crank disc 36 driven by a belt drive from the shaft 37 and swing- able about the axis of the shaft 37. In a modification, Fig. 7 (not shown), the system comprises a lower link and two upper links carried by and pivotable about a transverse shaft carrying an arm connected to a hydraulic cylinder. The rear link system comprises lower links 30 and an upper link 31, the links 30 being actuated by a hydraulic actuator 32 connected to the hydraulic reservoir in the member 1, a pump 33 supplying the reservoir.
Patent GB-797979-A (GB)
Title: Improvements in or relating to organo-silicon compositions
IPC: C08L83/04
Filed: 1957-02-12
Abstract: A copolymerizable organosilicon composition comprises (1) from 5 to 75 per cent by weight of the trisiloxane of the formula <FORM:0797979/IV (a)/1> or of the formula <FORM:0797979/IV (a)/2> or of the formula <FORM:0797979/IV (a)/3> or mixtures thereof, and (2) from 25 to 95 per cent of a polysiloxane in which the units are monovinyl, phenylvinyl, monophenyl, phenylmethyl, monomethyl or diphenyl siloxane units, which polysiloxane may contain up to 20 mol. per cent of units of the formula R3SiO, where R is methyl, phenyl or vinyl, at least 10 mol. per cent of the polysiloxane being vinyl siloxane units and the phenyl : silicon ratio being from 0.25 : 1 to 1.1 : 1, and (3) an organic peroxide or per-ester curing agent.  The compositions may be cast by the usual methods and may also be used to impregnate coils, transformers, &c.  Fillers such as metal oxides, silica, carbon black, glass fabric, glass beads, asbestos and clays may be added to the compositions.  In the examples: (1) a copolymer of 29.4 mol. per cent of PhViSiO, 62 mol. per cent of PhMeSiO and 8.6 mol. per cent of PhMeViSiO0.5, having a viscosity of 7400 c.s. at 25 DEG  C., is mixed with 30 per cent by weight of Me2ViSiOSi(Ph2)O SiMe2Vi to give a mixture of viscosity 800 c.s., and 1 per cent of di-tert. butyl peroxide is added.  The mixture is cured by heating at 150 DEG  C.; (2) a copolymer of 60 mol. per cent of PhMeSiO and 40 per cent PhViSiO having a viscosity of 2,500 c.s. is mixed with 25 per cent by weight of Me2ViSiOSi(Ph)(Me)OSiMe2Vi and 1 per cent of di-tert. butyl peroxide, and is cured at 150 DEG  C.; (3) 75 parts of the copolymer of Example 2 is mixed with 25 parts of Me2Vi SiOSi(Ph)(Vi)OSiMe2Vi and cured as before.  The trisiloxanes may be prepared by cohydrolysing Me2ViSiCl with Ph2SiCl2 or PhMe SiCl2 or PhViSiCl2. Specification 755,198 is referred to.
Patent GB-805000-A (GB)
Title: Method of separating plutonium
IPC: C01G56/00
Filed: 1947-02-19
Abstract: Plutonium is separated from elements having an atomic number not greater than 92 by dissolving in aqueous acid to give an acidity of 0.5-4N and extracting the plutonium with a water-immiscible organic solvent, a salting-out agent being present in the aqueous solution. The plutonium should be in the tetravalent state.  The salting-out agent may be a watersoluble salt of ammonium, sodium, magnesium, aluminium, zinc, copper, iron, strontium, or calcium, e.g. ammonium, calcium, or magnesium nitrate.  Suitable solvents are methyl n-propyl ketone, methyl n-amyl ketone, ethyl isobutyl ketone, triglycol dichloride, dibutyl carbitol, dibutoxytetraethylene glycol, betaethoxyethyl acetate, carbitol acetate, n-butyl-d-tartrate, ethyl acetate, beta phenyl ethyl alcohol, dibutyl carbinol, isobutyraldehyde, anisaldehyde, nitromethane and nitroethane.  In examples: (1) plutonium is separated from uranium and fission products by dissolving neutron-irradiated uranium in nitrac acid, saturating with ammonium nitrate, adjusting the acid strength to 2N, and extracting seven times with triglycol dichloride; the organic extracts are washed with saturated ammonium nitrate solution and then with water to remove the plutonium from the solvent. Nitromethane and nitroethane also are suitable solvents for this process; (2) plutonium is separated from fission products by dissolving in nitric acid, adding calcium nitrate, and extracting with triglycol dichloride; (3) plutonium and uranium are separated from fission products by saturating a nitric acid solution with ammonium nitrate and extracting with methyl iso-butyl ketone, diethyl ketone, nitromethane or dibutyl carbitol.
Patent GB-684898-A (GB)
Title: Improvements in or relating to collapsible seats for perambulators
IPC: B62B9/12
Filed: 1951-03-01
Abstract: 684,898. Seats. DAVIES, D. L. Jan. 7, 1952 [March 1, 1951], No. 4971/51. Class 52(ii) A child's seat for a perambulator comprises a seat proper 1 connected to a back rest 2 by hinges 3 of flexible material the seat 1 being connected to press studs on the sides of the perambulator by side flexible flaps 4. The back rest 2 is adjustable angularly by straps 7 connectible to the press studs on the perambulator.
Patent GB-1495581-A (GB)
Title: Motor vehicle battery charging system
IPC: B60R16/03
Filed: 1975-02-06
Abstract: 1495581 Vehicle electrical systems DUCELLIER & CIE 6 Feb 1975 [15 Feb 1974] 5019/75 Heading H2H In the electrical system of the motor vehicle the device indicating that the alternator of the vehicle is not generating comprises one or more light emitting diodes. An alternator 1, 2, 3 of a motor vehicle is connected so as to charge a battery 13 by way of a full wave rectifier 5-10, the output of the alternator being controlled by means of a regulator 12 acting upon the field winding 15 of the alternator. With the alternator stationary, closure of the ignition switch 14 will cause a light emitting diode 16 to be illuminated since the battery voltage at point B is above the phase voltage of the alternator at point A. When the alternator is being driven the phase voltage at point A is approximately equal to the battery voltage and the diode 16 then emits no light. A diode 20 prevents discharge of the battery into the alternator. In a further embodiment the phase voltage at the point A is used to control the conduction of a transistor placed in parallel with the light emitting diode.
Patent GB-687480-A (GB)
Title: Improvements in or relating to gas turbine plants
IPC: F04D29/58
Filed: 1949-02-24
Abstract: 687,480. Gas turbine plant, axial flow compressors. SOC. RATEAU and ANXIONNAZ, R. Feb. 24, 1949 [Feb. 27, 1948; April 17, 1948], Nos. 5107/49 and 5108/49. Classes 110(i) and 110(iii) A gas turbine plant has water, which is heated by turbine exhaust gases, injected into the compressor either between two successive compressor wheels or at the periphery of a wheel in the air passages between the blades. A rotating disc 41 between two bladed rotor discs is provided with a water channel 40 ending in a spray nozzle 42. There are two such discs and water is supplied to them from pipes 49a, 49b which supply rotating chambers 49<SP>1</SP>a, 49<SP>1</SP>b, from which lead the conduits 47a, 47b. Alternatively, the channels 40 may be provided in the rotor discs with spray nozzles between the rotor blades. The injection into a stage may be controlled by a valve actuated by a spring loaded diaphragm subjected to the pressure rise across a part of the compressor. The injected water is heated by the turbine exhaust in a heat exchanger arranged after the preheater for the combustion air. The Specification as open to inspection under Sect. 91, comprises also the subject-matter of Specifications 676,008 and 687,548. The invention is described with reference to a gas turbine plant having two turbines driving the compressor by a common shaft with reheating between the turbines. It is stated that the turbine driving the compressor may be on a separate shaft from the turbine giving useful power. This subject-matter does not appear in the Specification as. accepted.
Patent GB-1498762-A (GB)
Title: Fuel cells
IPC: H01M8/02
Filed: 1976-02-10
Abstract: 1498762 Fuel cells INSTITUT FRANCAIS DU PETROLE 10 Feb 1976 [25 Feb 1975] 05179/76 Heading H1B A fuel cell comprises a block made of a stack of electrodes (e.g. 1, 2) delimiting between each other compartments of substantial thickness for containing products necessary to the operation of the fuel cell, and at least one intermediate element 4 in one of said compartments, the volume of said element being such as to leave only a small free volume available to said product in said compartment, the element being located so that said free volume is divided into two spaces respectively adjacent the two electrodes, the two spaces extending over substantially all the area of the electrodes, and the element having perforations 4a extending between said two free spaces. Element 4 may be made from 2 sheets of polyethylene, polypropylene or polyamide joined together and having hollow "bubbles" formed by co-operating hemispherical indentations in the sheets; the 2 sheets may be coated "internally" with polyvinylidene chloride, and the "bubbles" are gas-filled. Element 4 preferably has an average density # that of the product in the same compartment, and is inert with respect to the product. An alternative element 4 (as shown) is a parallelepiped, e.g. of expanded polystyrene, with apertures as shown; the element may occupy # 95% of the interelectrode space.