baber/WOPTO huggingface dataset:
Patent GB-1501388-A (GB)
Title: Mounting assemblies for electronic components
IPC: H01L23/373
Filed: 1974-07-30
Abstract: 1501388 Thyristor mountings AEI SEMICONDUCTORS Ltd 20 May 1975 [30 July 1974] 33544/74 Heading H1K An electric component, e.g. a thyristor 1, is mounted on a flat base-plate 2 with an array of cooling fins 3 on its rear surface; the thyristor 1 being sandwiched between a pair of copper bodies 4, 5 and electrically and thermally conductive thrust plates being interposed if necessary between opposing faces of the copper bodies and the contact faces of the thyristor. The terminal members 8, 9 are retained against the copper bodies by studs 10 recessed to accommodate pairs of discs 11, 12; the latter being recessed into an insulant bush 13; the assembly being compressed by a dished spring 14 located by retaining block 16 recessed into the bush and by clamp 15 screwed at 21 to block 16 and secured by tie-rods within insulant tubes 18 to pillars 17 upstanding from the baseplate. A clamping plate 19 screwed to pillars 17 is screwed against spring 22 to retaining block 23 recessed into insulant bush 25 in turn recessed to locate a pair of discs 26, 27 of which the latter is recessed into body 4 or 5; whereby the latter are resiliently clamped against insulant thermally conductive discs 28 of boron nitride resting on bosses 29 apertured into the base-plate 2 and located by rim 29. The retaining pressures of the springs are adjustable, and a direct control connection is made to the thyristor over a flexible cable, not shown. Thermal expansion or contraction is taken up by the springs and the slidable interface between discs 10, 11 and 26, 27. The assembly may be enclosed by a box with a rim secured to the base-plate, and this may be flameproof.
Patent GB-1145587-A (GB)
Title: Improvements in telephone subscriber's instrument
IPC: H04M1/58
Filed: 1967-07-21
Abstract: 1,145,587. Substation circuits. INTERNATIONAL STANDARD ELECTRIC CORP. 21 July, 1967 [26 July, 1966], No. 33571/67. Headings H4K and H4R. In a substation which includes moving coil type transmit and receive transducers, outgoing speech is amplified by an amplifier which derives its D.C. power from the line and which consists of two stages of transistors that are D.C. coupled by a voltage dependent resistor which also serves for compensating for different lengths of lines, the emitters of the two transistors being coupled by a positive feedback A.G.C. circuit which includes a further voltage dependent resistor. Calling tone generator.-This comprises an audio transducer TG which forms part of the resonant circuit of an exchange battery powered transistor oscillator T1. The transducer produces a variable frequency tone continuously once it has responded to the initial negative pulse of ringing current. Transmit amplifier.-This consists of a dynamic microphone MA which is coupled via a low impedance network R19, C9 to a two-stage D.C. coupled amplifier T4, T3. (MA acts virtually as a constant current source and it is decoupled from the exchange line D.C. by capacitor C9). The amplifier includes a negative feedback path R13, a positive feedback path which provides A.G.C. (VR2) and is voltage gain stabilized because of the unbypassed resistors R12, R17. Operating current is derived from the line via a full wave rectifier D3-D6 and is supplied (at least to T4's collector and T3's base) via choke L1 and resistors R16, VR1. A measure of high frequency compensation is provided by C6. Anti-sidetone circuit consists of a transistor T2 which has a gain equal to that of T3 whereby a minimum of sidetone appears in the receiver RA whatever the length of line to which the set is connected. Receive amplifier.-This is only operative for long lines and comprises transistors T4, T2. A portion of the input signal is applied to T4 across R13, R17 and is amplified by T4 since T4's gain is increased considerably (via its positive feedback circuit) on long lines. The signal path to RA ordinarily consists in: A wire; junction D5, D6; RA; RB; R9 and R11, C5; C7; junction of D3, D4. Voltage dependent resistors VR3, VR4 act as click suppressors on incoming signals. Long line compensation is provided, by VR5 which stabilizes the collector current of T4, by VR1 which limits internal power dissipation on short lines and, by the resistance of L1, R16, R12 (and VR1) which govern the ratio of T4's collector current to T3's base current and hence the stability of the D.C. potential at the set's terminals.
Patent GB-771051-A (GB)
Title: Method of detecting leaks and testing media for that purpose
IPC: G01M3/20
Filed: 1955-11-23
Abstract: 771,051. Detecting leaks. GENERAL ELECTRIC CO. Nov. 23, 1955 [Dec. 7, 1954], No. 33617/55. Class 106 (2). [Also in Groups XL (a) and XL (b)] In detecting leaks in a metallic vessel, the vessel is filled with a corrosion and rust inhibiting non-inflammable liquid comprising an aqueous solution of a liquid amine, a wetting agent, preferably non-ionizing, and a radioactive or fluorescent indicator substance so that the aqueous solution penetrates the vessel through the leaks to its exterior surface where the presence of the testing liquid may be observed by its radioactivity or fluorescence. Suitable amines are the hydroxy alkyl amines, particularly ethanolamine, diethanolamine, triethanolamine, and propanolamine, and morpholine (diethylene imide oxide), in concentrations of 0.25-2 per cent by weight. Suitable wetting agents are sodium dioctyl sulphosuccinate, sodium heptadecyl sulphate, sodium dioctyl phosphate, sodium tetradecyl sulphate alkyl aryl sodium sulphonates, polyethoxyamines, di-tertiary acetyloenic glycols, polyoxethylene thioethers, polyethylene glycol tert-dodecylthioether and alkyl phenyl polyethylene glycol ethers. The preferred concentration of wetting agents is 0.001 to 0.5 per cent by weight. Suitable fluorescent indicators are fluoroscein and beta-methyl umbelliferone in concentrations of 1-50 parts per million. A suitable radioactive indicator, which also forms the corrosion inhibitor is ethanolamine C 14 . A specific formulation comprises 0.5 per cent by weight of monoethanolamine, 0.05 per cent by weight of polyethylene glycol tert-dodecylthioether and 50 parts per million of fluorescein. The liquid may be held under pressure (3-20 pounds) in the interior of the vessel being tested.
Patent GB-605031-A (GB)
Title: Process for the manufacture of halogenated hydroxybenzamides of the heterocyclic series
IPC: C07D277/44
Filed: 1945-12-12
Abstract: Dihalogeno-hydroxybenzamides of the heterocyclic series are prepared by condensing dihalogeno-hydroxybenzoic acid, or their reactive derivatives, with heterocyclic amino compounds, preferably in the presence of diluents and condensing agents. Examples are given of the condensation of (1) 3,5-dibromo-salicyl chloride with 2-amino-4-methylthiazole in the presence of ether; (2) 3,5-dibromo-salicyl chloride with 2-aminothiazole in the presence of chloroform and pyridine; (3) 3,5-dibromo-salicyl chloride with 4-amino-antipyrine in the presence of chloroform; (4) 3,5-dichloro-salicyl chloride with 2-amino-4-methyl-thiazole in the presence of chloroform; (5) 3,5-dichloro-salicyl chloride with 2-aminothiazole in the presence of ether and pyridine; (6) 3,5-dibromo-salicyl chloride with 2-aminopyridine in the presence of chloroform and pyridine; (7) 3,5-dichloro-salicyl chloride with 2-aminopyridine in the presence of benzene; (8) 3,5-diiodo-salicyl chloride with 2-amino-4-methylthiazole in the presence of chloroform; (9) 3,5-diiodo-salicyl chloride with 2-aminopyrimidine in the presence of benzene and pyridine, and (10) 3,5-diiodo-salicyl chloride with 2-aminothiazole in the presence of dioxane and pyridine.
Patent GB-1199445-A (GB)
Title: Method of Producing Castings of Plasticisable Material.
IPC: B29C45/23
Filed: 1967-07-21
Abstract: 1,199,445. Injection moulding. MASCHINENFABRIK UND GIESSEREI NETSTAL A.G. 21 July, 1967 [26 Aug., 1966], No. 33764/67. Heading B5A. [Also in Division B3] Articles of large volume of a thermoplastics material are made by filling a mould in two consecutive stages, the first stage being without any substantial pressure rise and the second by injection at high pressure. In the example shown the material is plasticized in a cylinder 2 by heating elements la and introduced into the mould by a rotating screw 3. Axial advance of the screw effects full pressure injection. A valve pin 8 operated through a pivoted crank 9 maintains the nozzle 6 closed during the plasticizing stage. In an alternative embodiment (not shown) both low and high-pressure filling are effected by means of a piston.
Patent GB-302052-A (GB)
Title: Improvements relating to the treatment of plant stems to obtain fibres therefrom
IPC: D01C1/02
Filed: 1927-12-14
Abstract: 302,052. Bahre, C. E. Dec. 14, 1927. Retting.-Stem fibres are treated with a disaggregating liquor in the presence of cholesterol or a substance rich in cholesterol. Phytosterol or vegetable cholesterol may be used. Fish oil, egg yolk, egg oil, wool fat, or cerebral substance are suitable animal substances rich in cholesterol. The material may be. placed in an autoclave with an ammoniacal or alkaline carbonate lye to which 10 grams of cholesterol per litre has been added. The material is boiled for twelve hours at a pressure of 8 atmospheres. It is, then separated, washed, neutralized and finally dried in vacuo at a low temperature.
Patent GB-902248-A (GB)
Title: Cutter head for dry shaver
Inventor: WAHL JOHN FRANCIS
IPC: B26B19/04
Filed: 1959-10-08
Abstract: 902,248. Dry shavers. WAHL CLIPPER CORPORATION. Oct. 8, 1959, No. 34105/59. Class 131. A dry shaver head comprises an outer shearplate 30 and a reciprocated inner cutting-member 36 which are formed of thin flexible prehardened sheet-metal, each having a perforate portion including a cutting region, the entire regions being in contact, deformable and resilient so that when the shear-plate is deformed the cutting member deforms and contact between the cutting regions is maintained. As shown, the shear-plate is arched and is secured by bars 32 to a bearing 20 integral with the casing 15. An electromagnet 17 and an armature 18, adjustable by springs to suit the voltage, are enclosed in the casing which has a removable part 16. A projection 23 of the armature passes through an aperture 22 at one end of the bearing 20 to engage in an aperture in a tongue 45 of a moulded nylon support 37 which has grooves to receive the edges of the cutting member. The tongue 45 is depressed by the engagement with the projection 23 to ensure bearing relation between the support 37 and the bearing 20. The initial contact between the shear-plate and the cutting-member may be such as to deform these members to provide cutting bias. The apertures in the shear-plate and cutting-member are formed by stamping or etching.
Patent GB-629938-A (GB)
Title: Improvements in or relating to work-holding vices
IPC: B25B1/14
Filed: 1947-12-24
Abstract: 629,938. Vices. CENTRAL TOOL & EQUIPMENT CO., Ltd., and SAMUEL, W. D. Dec. 24, 1947, No. 34226. [Class 61(ii)]  In a power-operated vice, the power operates directly to move the movable jaw up to the work and a multiplying linkage then comes into operation to apply workholding pressure to the jaw. The piston of a pneumatic cylinder 20 is connected to a bar 21 to which are pivoted two links 22. The outer end of each link is pivoted to one arm of a bell-crank lever 24, the other arm of which is pivoted to a link 27 connected to the movable jaw 15. The bell-crank levers are pivoted on a slide 25 which is held up to the movable jaw by springs and which carries pawls cooperating with racks on the base 11 of the vice. When pressure is applied to the piston, the lever system, slide and movable jaw are moved together until the latter engages the work. The lever system then tends to move the slide rearwardly until the latter is locked by the pawls engaging the racks, after which it acts as a fulcrum for the lever system which then applies increased pressure to the movable jaw to grip the work. When pressure is released and the piston is returned by a spring, the pawls are unlocked automatically.
Patent GB-508996-A (GB)
Title: Improvements in or relating to the cylinder ports of two-stroke internal combustion engines
IPC: F02B75/02
Filed: 1938-11-24
Abstract: 508,996. Cylinders. MASCHINENFABRIK AUGSBURG-NURNBERG AKT.- GES. Nov. 24, No. 1938, No. 34239. Convention date, Nov. 24, 1937. [Class 7 (ii)] In a two-stroke engine cylinder, having superposed piston-controlled inlet and exhaust ports 3, 4, one or more exhaust ports 5 are increased in area by extending them downwards. The inlet ports below them are thus reduced in area, or they may be omitted.. The extended exhaust ports, which may be at the middle or ends of the row, may be trapezoidal in shape.
Patent GB-1397716-A (GB)
Title: Variable resistors
IPC: H01C10/44
Filed: 1973-07-18
Abstract: 1397716 Variable resistors E F JOHNSON CO 18 July 1973 [15 Sept 1972] 34247/73 Heading HIS A variable resistor 10 comprises an elongate T-shaped insulating base 11 carrying resistive and conductive tracks on top and bottom surfaces of the cross-bar of the T, and a conductive slider 20 with a contact 21 which engages the top track 16 and sides 25, 26 which embrace the cross-bar so that bottom portions 27, 28 of the slider engage the lower tracks 15, 14. The base 11 is of ceramic or plastics and the contact 21 is shown biased by a spring 22, but a resilient woven or mesh contact (21a, Fig. 6, not shown) may be used. The track 16 is a resistive track connected to a conductive end coating 13 on the base 11, while the tracks 14, 15 are conductive and are connected to an opposite end coating 12; the coatings 12, 13 are soldered to printed circuit board conductors 31, 32. To provide a potentiometer, however, the coatings 12, 13 are connected to the two ends of track 16 and other conductive surfaces are provided, connected to tracks 14, 15. The tracks may contain discontinuities for specific applications, and track width may vary along its length.
Patent GB-900467-A (GB)
Title: Improvements in or relating to roller conveyors
Inventor: KEEN EDWARD DIXIE
IPC: B65G13/00
Filed: 1960-06-21
Abstract: 900,467. Roller conveyer units. WHITWORTH GLOSTER AIRCRAFT Ltd. June 21, 1960, No. 34255/60. Divided out of 900,466. Class 78 (1). A roller conveyer unit 5 is made of a baseplate 14 formed by pressing or extruding so as to have sides 15 which support self-lubricating plastic rollers 16, and so to have apertures 25 for lightness. As applied to an aircraft (Fig. 2), the aircraft body 2 has a plurality of such roller units 5 secured to the floor and is provided with doors 3, 4 and end retractable stops 12. Goods are fed into the aircraft on pallets, the sides of which engage with and are guided by rails 11.
Patent GB-768743-A (GB)
Title: Improvements relating to internal shoe drum brakes
Inventor: GRIFFIN CHARLES ARTHUR
IPC: F16D65/827
Filed: 1954-11-26
Abstract: 768,743. Internal shoe-drum brakes. MORRIS MOTORS, Ltd. Oct. 12, 1955 [Nov. 26, 1954], No. 34285/54. Class 103 (1). In order to prevent " heat-spotting " and brake fade in internal shoe-drum brakes, a thermally-conductive barrier-like member 3 (e.g. brass) is provided at or near the pivotal end of a shoe which extends transversely over the flange 4 of the shoe; a substantial gap being left between the member 3 and the neighbouring end 7 of the brake lining 2, and which either rubs lightly against or lies very close to the operative surface of the brake drum. In order to promote dissipation of heat a thermally-conductive element 8 (e.g. copper braid) is connected at one end to the web of the shoe and at its other end to the back-plate 10 of the brake (Fig. 3). The back-plate 10 is provided with an annulus 11 of thin cooling blades mounted in good thermal contact on the back-plate and exposed to the airstream. In an alternative construction, the barrier-like member 13 is in the form of a copper anglepiece passing through a slot in, and secured to, the back-plate 10. The slot 16 in angle-piece 13 enables it to be adjusted to make light rubbing contact with the operative surface 17 of the brake drum 18, or so that it is just clear of the surface. The heat absorbed by the member 13 during- operation of the brake is conducted to the back-plate and then dissipated by the device illustrated in Fig. 3. Specification 701,725 is referred to.
Patent GB-342962-A (GB)
Abstract: 342,962. Hand knitting appliances. LONDON ASSOCIATION FOR THE BLIND, 144A, Warwick Street, and ALEXANDER, F. E., 168, Fleeming Road, Wal. thamstow, both in London. April 16, 1930, No. 12100. Drawings to Specification. [Class 74 (ii).] Knitting needles or pins are formed with one or more flats, extending over a portion of the length, to enable the loops to be picked up more readily. One or both ends of the needle or pin are pointed.
Patent GB-1482585-A (GB)
Title: Semiconductor device
IPC: H01L29/00
Filed: 1974-08-05
Abstract: 1482585 Semi-conductor devices SEMIKRON GES EUR GLEICHRICHTERBAU UND ELEKTRONIK mbH 5 Aug 1974 [8 Aug 1973] 34367/74 Heading H1K At least the peripheral part of a PN junction formed in a lightly doped wafer of one conductivity type is produced by diffusion into the walls of a recess formed in a main face of the wafer, the inclination of the upper edge of the recess and its distance from the eventual location of the wafer edge being such that the junction periphery makes an angle of less than 90 degrees with said edge which itself is normal to the main face of the wafer. In making the thyristor shown in Fig. 4 the junctions between P+ zones 2, 4 and the N-type wafer 1 are identically formed in this way and the emitter region 5 in a subsequent step. A number of device forms may be produced in a common wafer from which they are later divided by use of various circular and annular recess configurations and masking to limit the areas into which diffusion may occur.
Patent GB-443657-A (GB)
Title: Improvements in or relating to drums, cans, kegs and like sheet metal containers
IPC: B65D21/02
Filed: 1934-12-03
Abstract: 443,657. Heads for drums, kegs, &c. ANTHONY, W. D., 63, Great George Street, Liverpool. Dec. 3, 1934, No. 34620. [Class 21] A drum, can, keg, or like sheet metal container is constructed so that it can be stacked without injury to its handle 3 or pouring spout 4 by providing on the head an upstanding corrugation or ridge 5 of arched, angular, ridge or other section interrupted at 6 to clear the pouring spout and spaced inwards from the edge to provide a flange 7 which is seamed, welded, &c. to the body. The corrugation may be interrupted to form a series of projections.
Patent GB-1498746-A (GB)
Title: Preparation of steroidal 19-nor-3-hydroxy-1,3,5(10)-trienes
IPC: C07J75/00
Filed: 1975-08-21
Abstract: 1498746 Preparation of steroid 19-nor-3- hydroxy - 1,3,5(10) - trienes MITSUBISHI CHEMICAL INDUSTRIES Ltd 21 Aug 1975 [22 Aug 1974] 34752/75 Heading C2U A 10 - methyl - 3 - keto - #<SP>1,4</SP> - steroid dissolved or suspended in a hydrocarbon is pyrolysed by mixing with a preheated hydrocarbon which is cracked to a significant degree at the pyrolysis temperature, to produce a 19-nor-3- hydroxy-#<SP>1,3,5(10)</SP>-steroid. The preheated hydrocarbon may be, for example, ethane, propane, butane, pentane, heptane, kerosene, light oil, tetralin, naphtha, decalin, mineral oil or cyclohexane and it is suitably heated to 450-750 C. and supplies at least most of the heat required for conducting the pyrolysis. The weight of this hydrocarbon may suitably be 10-2,000 times as large as that of the starting steroid, preferably 20-1000 times as large. The starting steroid may be dissolved or suspended, for example, in an aromatic hydrocarbon or a mixture of such with tetralin, decalin, light oil, kerosene or naphtha, and the solution or suspension is preferably heated to a temperature of up to 300 C. before mixing with the preheated hydrocarbon. To prevent tar and coke formation the surface of the feed pipe for the solution or suspension of the starting steroid near the opening to the mixer is preferably maintained at a temperature below 450 C., most preferably below 400 C., for which purpose the feed inlet pipe may be enclosed within a jacket through which a coolant gas, e.g. N 2 , is passed. The presence of water or hydrogen in the reaction mixture also inhibits tar and coke formation. The pyrolysis is most preferably carried out at 500-650 C. with a linear gas velocity of 30- 30,000 cm./sec. and a residence time of 0À01- 30 sees. The reaction mixture is subsequently rapidly quenched by direct contact with a hydrocarbon having a b.pt. higher than that of the preheated hydrocarbon. Products obtained in the examples are estrone and 3-hydroxyestra- 1,3,5(10),6-tetraen-17-one; and 17#-hydroxyandrosta-1,4,6-trien-3-one and pregna-1,4-diene- 3,20-dione are also referred to as suitable starting materials.
Patent GB-447502-A (GB)
Title: Improvements in or relating to ball swivel joints for use with steam and other fluid conduits
IPC: F16L27/073
Filed: 1934-12-04
Abstract: 447,502. Locking nuts. DEWRANCE, SIR J., 165, Great Dover Street, Southwark, London. Dec. 4, 1934, No. 34818. [Class 89 (i)] [See also Group XXVIII] In a ball-and-socket pipe joint in which fluidtightness is effected by laminated packings 9<a>, 9<b>, inadvertent disengagement of the gland 7 and socket 2 is prevented by a grub screw 11, or else a spring arm, which is provided on one of the two members to coact with slots or serrations on the other.
Patent GB-1005391-A (GB)
Title: Improvements in or relating to strengthened glass objects
IPC: C03C8/10
Filed: 1961-09-28
Abstract: A glass object, e.g. a cathode-ray tube, is strengthened by covering at least partly with a layer under compressive stress which consists at least in part of crystallized glazing consisting of 40-72% PbO, 15-40% ZnO, 7.5-25% B2O3, and having a low coefficient of expansion (i.e. 45 x 10-7 per  DEG  C.). The glazing may be applied as a suspension in alcohol and water to the surface of a glass object having a coefficient of expansion of 100 x 10-7 per  DEG  C.  The object is then heated for at least 5 minutes at 400-500 DEG  C. Examples of glass objects coated with the above glaze consist of (i) SiO2 68.2%, Na2O 16.8%, K2O 1.0%, CaO 5.5%, BaO 2.0%, MgO 4.0% and Al2O3 2.5%; (ii) SiO2 70.3%, Li2O 0.5%, Na2O 7.8%, K2O 7.5%, BaO 11.1%, Al2O3 2.5% and Sb2O3 0.3%.
Patent GB-1427409-A (GB)
Title: Connectors for fluid conduits
IPC: F16K15/04
Filed: 1973-07-23
Abstract: 1427409 Valves, pipe couplings FESTOMASCHINENFABRIK GOTTLIEB STOLL 23 July 1973 [18 Aug 1972] 34930/73 Headings F2V and F2G A connector for pipes carrying gaseous media includes an infinitely variable throttle valve element 7 for controlling flow in one direction through the connector and in parallel with the throttle a loose-ball spring loaded checkvalve 9 to give free flow in a reverse direction through the connector. The connector comprises two main parts, a connector part 3 which can swivel around a casing 1. Grooves 102 are provided in the seat of the checkvalve to permit of a small flow when the ball is seated.