baber/WOPTO huggingface dataset:
Patent GB-693726-A (GB)
Title: High current gain semi-conductor devices
IPC: G01R31/26
Filed: 1951-04-18
Abstract: 693,726. Semi-conductor amplifiers. RADIO CORPORATION OF AMERICA. April 18, 1951 [April 21, 1950], No. 9046/51. Class 40 (iv). [Also in Group XL (c)] The current gain characteristic of a transistor is increased by a forming treatment in which a condenser is suddenly discharged between the base and collector electrodes, while biasing voltages are applied to the electrodes, and the collector is spaced at least 0.01 inches from the emitter electrode. Fig. 2 shows a circuit arrangement in which a pulse from charged condenser 31 is applied by means of switch 32 in the reverse current direction between the point contact collector electrode 14 and base electrode 11. The emitter electrode is biased in the forward direction by means of a battery in series with a resistance, and the collector electrode is similarly biased in the reverse direction. The spacing between the emitter and collector electrodes at the time of the pulse is adjusted to about 0.015 inches. Experimental data is furnished to show that the process results in increased current gain, reduced base resistance and reduced output resistance when the treated device is subsequently operated as a normal transistor amplifier, but with the same spacing of about 0.015 inches between the emitter and collector electrodes. The resistivity of the semi-conductor material in this case is assumed to be high, i.e. between 10 and 20 ohm-centimetres. If the resistivity of the semi-conductor material is low, i.e. between 2 and 8 ohmcentimetres, the collector and emitter electrodes may be placed the normal distance apart (i.e. not more than 5 mils.) after the pulsing treatment has been applied at the increased spacing of about 0.015 inches. Alternatively, an auxiliary electrode, spaced at this distance and biased as the emitter, the normal emitter being disconnected, may be used during the pulsing treatment, and then removed or disconnected. Fig. 1 shows a suitable construction for the device. The semi-conductor material may consist of germanium, silicon, boron, selenium or tellurium.
Patent GB-414005-A (GB)
Title: Improvements in or relating to explosive projectiles
IPC: F42B12/20
Filed: 1934-03-22
Abstract: 414,005. Projectiles. BRANDT, E. W., 101, Boulevard Murat, Paris. March 22, 1934, No. 9060. Convention date, April 7, 1933. [Class 9 (i).] An explosive projectile specially constructed for use against aircraft consists of a thick hollow base 1 of a very dense material to which is attached a curved tapered member 2 having thin walls. The centre of gravity of the projectile is preferably located to the rear of the connection between the members 1 and 2, and the mass of the base is preferably concentrated near its periphery to obtain the maximum gyroscopic effect. In the construction shown in Fig. 1, the member 2 is connected directly to the base and has a rearward extension on which the driving bands 4 are formed. It is preferably composed of duralumin while the base is of tungsten or tungsten alloy. In a modification, Fig. 2, the gyroscopic effect is increased by disposing an annular mass 8 of high density around the base, the mass being held in position by an intermediate member 7 which constitutes the driving band. The propulsive effect of the gases on the projectile is increased by forming a cup-shaped depression 15 in the base 1. In another modification, a number of rings 11, Fig. 5, adapted to break into small fragments, constitute a part of the peripheral portion of the base 1. The member 2 is attached to the base by means of an intermediate member 12 and is provided at the nose with time and percussion fuzes 14, 13. The percussion fuze may be of the type described in Specifications 383,105 and 392,478. The base of the projectile, in a further modification, may be provided with a detachable propulsive basal member of the type described in Specification 410,326.
Patent GB-152582-A (GB)
Title: Improvements in or relating to shuttle motions for looms
IPC: D03D49/46
Filed: 1920-03-29
Abstract: 152,582. Norrman, A. E. March 29, 1920. Picking-motions; shuttles. - The picking is effected by oppositely reciprocating shuttle holders 1 without the aid of catches. The shuttle is carried part way through the shed by one holder, and as the velocity of the holder diminishes, the shuttle moves by its inertia into the other holder. The holders are adapted to enclose or partially enclose the shuttle and to support it during its passage through the shed, and are provided with extension pieces 3 guided by the framework of the loom and operated positively in both directions from a cam-controlled rock-shaft 17. The shuttle 2 has a form corresponding to that of the shed opening. The holders may have springs to act against the shuttle, and to be released at the moment of transfer from one holder to the other.
Patent GB-1519384-A (GB)
Title: Mechanism for operating a switch
IPC: H01H36/02
Filed: 1976-12-15
Abstract: 1519384 Magnetic switches BAYHAM Ltd 15 Dec 1976 [8 March 1976] 09124/76 Heading H1N A liquid level gauge has a contact operating shaft 11 carrying a permanent magnet 13 which is repelled to effect contact operation by a second permanent magnet 16, driven through reduction gearing 17, 18 from a spindle 10 which is movable in response to a level sensor 1. The spindle 10 has a magnet co-operating with a magnet 5 as in Specification 904,848 and has a pointer (not shown) on a scale face 27 of the gauge. Stops 19, 20 limit the movement of the magnet 13 and of the shaft 11 which can have a cam 12 acting on a microswitch arm 14 or carry a mercury switch. The stop 20 can be adjusted (Fig. 2b, not shown) and two contact operating shafts may be provided.
Patent GB-917069-A (GB)
Title: Extrusion of thermoplastic materials
Inventor: LANDER DAVID ROBIN
IPC: B29C48/09
Filed: 1960-03-15
Abstract: 917,069. Extrusion dies. IMPERIAL CHEMICAL INDUSTRIES Ltd. March 8, 1961 [March 15, 1960], No. 9133/60. Class 87(2). A die for the continuous extrusion of thermoplastic polymeric materials, e.g. polythene, polypropylene, nylon, polyvinyl chloride and acrylic resins in the form of rod, tubing, coatings on wire and similar products, is provided with a plurality of removable die plates 1 contiguous with the die face (not marked) forming between them an orifice 3 of the same shape and size as and coaxial with the die orifice 6 (not shown) so that the deposit of polymer 5 which builds up during extrusion may be removed by removal of the die plates 1 without interrupting the process. Preferably a pack of die plates, Fig. 3 (not shown) is provided to avoid the necessity for replacement of a single after removal and cleaning, the pack being maintained in alignment by a guide and spring-loaded in place.
Patent GB-738817-A (GB)
Title: Improvements in or relating to marking gauges
IPC: G01B5/06
Filed: 1952-04-10
Abstract: 738,817. Linear-dimension gauges. CHIVERTON, H. A. April 10, 1953 [April 10, 1952], No. 9233/52. Class 106 (2). [Also in Group XXIII] A height gauge capable of standing on a surface plate comprises a helically marked cylindrical body 1, having an anvil 9 and cursor 5 slidably and rotatably mounted thereon. The cursor 5 has a bevelled index edge 12 for reading height measurements against a graduated scale 18 on the helical line 14. To enable fractions of these divisions to be measured, the cursor sleeve 5 has a bevelled window 16 marked with a datum line 17 that can be brought into exact coincidence with the helical line 14 in the region of the window by rotational adjustment of the body 1. The intersection of an axial reference line 13 with the scale on the edge 12 then gives the measured value at said fraction. The gauge ends comprise plugs 2 having centre holes 4 accurately aligned with the axis of the body 1. If wear is detected, the cursor 5 is set to zero and the gauge mounted in a grinding machine between the centres 4, and the lower end face 3 of the body 1 and the reference surface 11 of the anvil 9 ground coplaner. The body 1 may be lengthened by a cylindrical extension piece to which the body can be fastened in end to end abutting relationship. The gauge may have a second cursor similar to the cursor 5 to enable the gauge to be used for determining the distance between two points. Only the upper cursor would be set by means of the scale on the instrument, the lower one being set to slip gauges or plug gauges.
Patent GB-1376533-A (GB)
Title: Shaft seals
IPC: F16J15/34
Filed: 1972-02-29
Abstract: 1376533 Seals RIGAKU DENKI CO Ltd 29 Feb 1972 [31 Aug 1971] 9243/72 Heading F2B A seal, e.g. for a shaft 6, of a rotary anode 1 in an X-ray tube comprises means 12 defining a helical groove 13 surrounding the shaft 6 for location in a stuffing box 5, and packing rings 10, 11 on the shaft 6 for retaining a low viscosity, low vapour pressure oil in the groove 13. Bearings 8, 9 are placed respectively between the ring 10 and the external atmosphere, and the ring 9 and the evacuated interior 3 of the X-ray tube, and the oil is supplied from a tank 16 open to the atmosphere through a hole 15, rotation of the means 12 with the shaft 6 exerting a pumping action on the oil in the groove 13. The anode 1 may be rotated through a drive pulley 7.
Patent GB-1079326-A (GB)
Title: Method and apparatus of cold heading blanks
Inventor: FRIEDMAN ROBERT GEORGE
IPC: B21K1/44
Filed: 1966-03-03
Abstract: 1,079,326. Forging bolts. NATIONAL MACHINERY CO. March 3, 1966, No. 9368/66. Heading B3H. A bolt is cold headed in a double blow heading machine from round wire stock by locating a workpiece 25 in a fixed receiving die 20, firstly deforming the protruding end of the workpiece by a punch 40 slidable within a polygonal die 35, and secondly deforming the resulting head 25a in a further die 57 (Fig. 5) to decrease its height and increase its diameter, a punch 59 simultaneously rounding off the edges of the head. A tool carrier 27 is shifted on a header slide 26 between the two steps to align the tools 28 and 50 with the workpiece. The tool 28 slides within the carrier 27 and houses the die 35, a stop 46 limiting sliding movement of the tool relative to the carrier, once the lost motion provided by a spring 34 is taken up. A lever 44, acting through a stem 43 of the punch, holds the workpiece within the receiving die 20 as the tool 28 is retracted. The second tool 58 includes a die 57 corresponding to the final shape of the bolt head, and a sliding punch 59, the tool and the carrier 27 moving together as the head 25a is deformed. As the carrier is withdrawn from the finished workpiece a lever 44<SP>1</SP> is operated to push the punch 59 clear of the die 57. The workpiece is then ejected by a pin 24 which, during working, forms the base of the receiving die 20. By providing a compound bore in the die 20, a bolt having a stepped shank and a collar on the underside of the head can be produced.
Patent GB-1136771-A (GB)
Title: Method and apparatus for sowing seed
Inventor: DAVIDSON MAXWELL WINGATE
IPC: A01C7/04
Filed: 1965-03-05
Abstract: 1,136,771. Seed sowing machines. MAXWELL DAVIDSON Ltd. 31 May, 1966 [5 March, 1965; 15 May, 1965], Nos. 9429/65 and 20629/65. Heading A1D. Seed is sown by accelerating it to at least the speed of sound in air to impact against the ground with sufficient force to penetrate to the desired depth below ground level. Seeds are fed into a chamber where they block a nozzle and air pressure is built up in the chamber so that the seed is ejected through the nozzle. As shown seeds are fed at spaced intervals along a pipe 30 through a non-return valve 31 into a chamber 32 and each seed blocks the orifice 35 causing pressure to rise in the chamber 32 which operates a piston 37 to operate a valve 39 of a high pressure supply line 40 the air from the supply forcing the seed through the nozzle 34.
Patent GB-1134487-A (GB)
Title: Improvements in vacuum-type circuit interrupter with pressure-monitoring means
IPC: H01H33/66
Filed: 1967-02-28
Abstract: 1,134,487. Vacuum switches. GENERAL ELECTRIC CO. 28 Feb., 1967 [17 March, 1966], No. 9436/67. Heading H1N. Should the pressure within the envelope 11 of a vacuum switch 10 become too high, opening of the switch contacts 17, 18 is prevented by the initiation of a discharge between a screen 30 and the contacts 17, 18, a high potential source 51 being connected across the screen and contacts by auxiliary contacts 90 only when the vacuum switch is closed. The discharge current flowing through a coil 62 trips a circuit-breaker 65 which at contacts 72 opens the circuit for the trip coil 74 of the vacuum switch, at contacts 68 opens the discharge circuit, and at contacts 70 completes an alarm circuit.
Patent GB-680431-A (GB)
Title: Preparation of crystalline dihydrostreptomycin hydrochloride
IPC: C07H15/238
Filed: 1949-04-08
Abstract: Crystalline dihydrostreptomycin hydrochloride having a characteristic X-ray diffraction pattern and exhibiting the following additional crystalline characteristics: indices of refraction a  = 1.522, b  = 1.548, g  = 1.566; birefringence -0.008; axial angle 2V (calculated) 80 degrees; is obtained by a process that comprises preparing an essentially anhydrous methanol solution of dihydrostreptomycin hydrochloride, decreasing the relative amount of methanol to form a supersaturated solution, exposing the supersaturated solution to traces of seed crystals of dihydrostreptomycin hydrochloride while agitating the solution, thereby causing crystallization of dihydrostreptomycin hydrochloride from the supersaturated solution. The amount of methanol may be decreased by adding an organic solvent which is miscible with methanol and which is essentially a non-solvent for dihydrostreptomycin hydrochloride.  As organic solvent there may be used acetone, isopropanol and ethanol.
Patent GB-527022-A (GB)
Title: Improvements in or relating to rubber and like articles
IPC: B29C65/48
Filed: 1939-03-28
Abstract: 527,022. Rubber and like articles. SEMPERIT OESTERREICHISCH AMERIKANISCH GUMMIWERKE AKT.-GES. March 28, 1939, No. 9626. Convention 'date, March 28, 1938. [Class 70] Toys and other articles made from superposed sheets 1, 2, of rubber or other elastic material are given a hollow or expanded form by turning the edges 3, 4 out of the plane of the sheets and uniting the edges by adhesive.
Patent GB-174896-A (GB)
Title: Improvements in traction devices
IPC: A63G31/00
Filed: 1921-03-31
Abstract: 174,896. Pickard, H., (Assignee of Beech, A. C.). Jan. 31, 1921, [Convention date]. Suspended vehicles.-A pasenger or goods car 27 is suspended from one end of a lever 12 which is fulcrumed on a carriage 8 travelling on an overhead track 5 provided with guard-rails 9. The opposite end of the lever 12 is fitted with a roller 22 which bears against the underside of a rail 21, which may vary in height along its length and thus cause the car 27 to rise and fall. The carriage 8 may be driven by a chain 32, by electromotors or by gravity. A pivoted landing- stage 42 may be provided. In a modification, the car 27 is suspended from a rope connected with a winch on the carriage 8 so that the car 27 can be lowered to the ground for loading.
Patent GB-1255587-A (GB)
Title: Organopolysiloxane compositions which cure at room temperature to give elastomers
IPC: C08L83/04
Filed: 1970-02-27
Abstract: 1,255,587. Organopolysiloxane elastomers; polysiloxanes. WACKER-CHEMIE G.m.b.H. 27 Feb., 1970 [27 Feb., 1969], No. 9659/70. Headings C3S and C3T. A composition which is storage stable in the absence of moisture and which cures to an elastomer on exposure to moisture comprises a hydroxy-terminated diorganopolysiloxane and a compound: R 3 Si(OSiR 2 ) n OSiY 3 (I) in which each R is independently an optionally substituted monovalent hydrocarbon group and each Y which may be the same or different represents a hydrolysable group selected from an acyloxy, hydrocarbonoxy, isothiocyanato, amino, aminoxy, acylamino, aminoalkoxy or oxime group. If n = 0 and Y is aminoxy of formula OY<SP>1</SP> where R<SP>1</SP> is a monovalent amine or heterocyclic amine radical the composition does not additionally contain 50-99À9% (based on the weight of I) of a difunctional nitrogensilicon material having the structural unit, R<SP>1</SP>(OY<SP>1</SP>)Si : where R<SP>1</SP> is the same as R or is a triorganosiloxy radical. R is preferably a radical containing not more than 8 carbon atoms and which does not contain a tertiary carbon atom. The organopolysiloxane may have the average general formula: (HO) x (SiR y O (4 _ y)/2 ) m H in which x = 0.99-1.01, y = 1.99-2.01, x + y = 3 and m is at least 3. It may have a viscosity of 100-200,000 cs./25 C. I may be used at from 0.5-40% by wt. of the total composition. Conventional fillers pigments and additives may be present. I may be prepared by reacting a compound: R 3 Si(OSiR 2 ) n OSiX 3  (X = halogen) with ammonia, a primary or secondary amine, a carboxylic acid anhydride, an N-substituted hydroxylamine, an acid amide, an aminoalcohol or an oxime in an inert solvent optionally in the presence of a proton acceptor. The Specification describes the preparation of 1,1,1-trimethyl- 3,3,3 - triacetoxydisiloxane and 1,1,1 - trimethyl - 3,3,3 - tricyclohexylaminodisiloxane and (CH 3 ) 3 SiOSi[ONC(CH 3 )Et] 3  by reaction of (CH 3 ) 3 SiOSiCl 3  with acetic anhydride, cyclohexylamine and methylethylketoxime respectively.
Patent GB-513213-A (GB)
Title: Improvements relating to teething beads and similar articles
IPC: A61J17/02
Filed: 1938-03-30
Abstract: 513,213. Moulding teething-beads &c. PAGE, H. F. March 30, 1938, No. 9709. [Class 87 (ii)] Teething-beads and similar articles having apertures therethrough are made by moulding an outer shell 2 of synthetic resin or similar plastic composition under pressure around a wooden core 1 in the form of a hollow dowel, openings 3 being left in the shell in alignment with the bore of the dowel. In moulding, the wooden core may be supported and centralised in the mould by a two-part locating pin, the parts having shoulders at the ends which cause recesses 5 to be formed in the shell. The moulding is done under such conditions that the material forming the shell penetrates into the fibre of the core.
Patent GB-610161-A (GB)
Title: Improvements in or relating to checker for open hearth regenerative furnace
IPC: F28D17/02
Filed: 1946-03-29
Abstract: 610,161. Checker brickwerk. STEVENS. A. H. (Steel Ingot Production, Inc.). March 29, 1946, No. 9751. [Class 64(i)] A checker for an open hearth regenerative furnace comprises bricks 20 laid in continuous vertical columns arranged in parallel vertical planes e.g. 25, 26, the columns in each plane having their adjacent ends spaced from each other and having at their ends, vertical sides that are parallel to said vertical planes and which overlap the vertical sides in adjacent columns to form a plurality of vertical flues 27 extending from top to bottom of the checker, the tops of the columns being smooth and lying in a horizontal plane and the horizontal meeting faces of each brick being provided with interlocking detents 18, 19 for vertical alignment. The horizontal joints of the bricks forming the columns are off-set vertically from the horizontal joints in each adjacent column and half bricks are used at the top and bottom alternately of adjacent columns to keep the tops of the columns level. Arches extending at right angles to the aforementioned planes 25, 26 carry blocks which support the checker columns.
Patent GB-368546-A (GB)
Title: Improvements in flushing apparatus for water-closets or the like
IPC: E03D1/08
Filed: 1931-03-31
Abstract: 368,546. Siphon discharge waterwaste-preventers. DAVIES, P. T., New Road, Armitage, near Rugeley, Staffordshire. March 31, 1931, No. 9799. [Class 26.] The lower end of the inlet limb 1, Figs. 1 and 5 of the U-shaped siphon is quadrant-shaped and is provided with a flap 4 pivoted to the side of the inlet limb adjacent the outlet limb 13 ; the flap is raised to start the flush by a device such as an L-shaped lever 5, 5a bearing against the underside of the flap at a point disposed within the quadrant-shaped end. The lever 5 is pivoted at 6 about an axis parallel to that of the flap 4, to a bracket 7 on the siphon, and is operated by means of a cranked member comprising an operating handle 8 capable of clockwise or anticlockwise movement and a boss 9, Fig. 1, carrying arms 9a with rods 10, 11 which engage the edges of the lever 5. The siphon is constructed from sheet brass and is shouldered at 13a so that the cross-sectional area of the limb 13 is less than that of the limb 1 above the normal water level. The member 5a is increased in thickness towards the outer end to form a curved surface coacting with the flap 4 near its pivot, while the flap 4 is similarly thickened and is provided with a boss 4b and curved end 4a. In a modification the flap 4 is operated by a rotatable crank connected to a rod vertically slidable in guides fixed to the siphon, the rod having a horizontal member coacting with the flap. According to the Provisional Specification, the pivoted flap is provided with a cam surface coacting with a ridge on the horizontal member of the rod.
Patent GB-1503939-A (GB)
Title: Semiconductor switch
IPC: H03K17/72
Filed: 1975-03-10
Abstract: 1503939 PNPN switches HITACHI Ltd 10 March 1975 [11 March 1974 19 July 1974] 9916/75 Heading H3T Undesired turn-on of a PNPN switch due to a rapid increase of anode-cathode voltage is prevented by a further switching means and a passive element connected in parallel with one end junction of the PNPN switch, the further switching means being controlled by a current derived from the current flowing through the other end junction. As described, a PNPN switch Q I, Q2 has a resistor R2 and transistor Q3 connected between cathode gate G K  and cathode K. If a rapid step voltage is applied across A-K, the potential at point 3 rises faster than at point 4 with the result that Q3 is saturated and Ql cannot conduct. The conductivity types may be interchanged so that transistor Q3 is connected between anode and anode gate. Transistors Q4 and Q5 may be combined as a multi-collector transistor. Transistor Q4 may be replaced by a diode or capacitor connected between the base of Q2 and point 3. The circuit may be integrated using a planar silicon technique. Two switches may be connected in antiparallel and voltage controlled by field effect transistors connected across Q2 to form a bidirectional speech path switch for a telephone.
Patent GB-931020-A (GB)
Title: External covering for window ledges
IPC: E04B2/92
Filed: 1962-03-15
Abstract: 931,020. Sill covers. ELTREVA A.G. March 15, 1962 [March 16, 1961], No. 9941/62. Class 20 (3). A sill e of a concrete window ledge a is provided with a cover-plate d which is formed along its outer edge as a gutter d<SP>1</SP> with drainage holes d<SP>2</SP> and supports outer aluminium alloy covers f reinforced on their inner sides with channels h. Between the cover-plate d and the outer covers f is a synthetic strip g. The inturned bottom edges f<SP>1</SP> of the outer covers f have drainage holes f<SP>2</SP> and are attached to an angle-iron section j which is anchored to the concrete ledge, which section j also supports one end of a thin cover plate i. The window frame c is of metal, and the ledge has an external lining b containing glass fibres.
Patent GB-181174-A (GB)
Title: An improved tin opener
IPC: B67B7/46
Filed: 1921-04-04
Abstract: 181,174. Cleburne, E. J., and Chandler, J. April 4, 1921. Opening by cutting. - A tinopener comprises a bifurcated plate, one prong A of which forms a. blade of double convex cross-section H, and on each side of the other prong C is secured an arm having a roughened foot adapted to serve as a fulcrum for the opener when in use. Preferably the roughened feet are in the form of serrated rollers, two on each arm. The outer roller G of each pair being of greater diameter than the inner roller F. A notch L is provided for removing crown corks from bottles.