baber/WOPTO huggingface dataset:
Patent GB-1104198-A (GB)
Title: Terephthalic acid esters
IPC: C07C69/82
Filed: 1966-07-26
Abstract: Polyalkylene terephthalates are prepared by subjecting a prepolymer to polycondensation in the presence of a catalyst, e.g. antimony trioxide, wherein the prepolymer is prepared by esterifying terephthalic acid with an alkylene glycol in a process comprising (a) heating 1 mole of acid with at least 1.2 moles of glycol and 0.01-1% by weight of acid of a volatile organic base at 240-320 DEG  C. and at a pressure above the vapour pressure of the glycol until 75-85% of the acid groups have been esterified and (b) maintaining the reaction product of (a) at 240-320 DEG  C. at a lower pressure than (a) until at least 95% of the acid groups have been esterified.  The catalyst may be added before or after the formation of the prepolymer.ALSO:The invention comprises a process for the esterification of terephthalic acid with an alkylene glycol involving (a) heating 1 molar proportion of terephthalic acid with at least 1.2 molar proportions of the glycol and 0.01 to 1% by weight (based on the acid used) of a volatile organic base at a temperature from 240 DEG  C. to 320 DEG C. and at a pressure above the vapour pressure at the reaction temperature of the glycol until 75 to 85% of the acid groups of the acid have been esterified and (b) maintaining the reaction mixture of the first stage at a temperature of from 240 DEG  to 320 DEG  C. at a pressure less than that of (a) until at least 95% of the acid groups of the acid have been esterified.  The pressure in (b) may be dropped continuously or in stages down to e.g. atmospheric pressure. Suitable volatile bases are alkylamines and cycloalkylamines having b.p.'s lower than that of the glycol.
Patent GB-777710-A (GB)
Title: Improvements relating to electric welding apparatus
Inventor: BRADY THOMAS WILLIAM
IPC: B23K11/24
Filed: 1953-12-06
Abstract: 777,710. Supply systems for resistancewelding depending on the use of static transformers. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 14, 1955 [Dec. 6, 1953], No. 33668/53. Class 38 (4). A peaking transformer 15 of the self-saturating type, for supplying firing potentials to valve apparatus 14 through which a resistance welding transformer 12 is controlled, is provided with one or more D.C. windings 20, 21 whereby the transformer core may be so saturated as to inhibit output from its secondary windings 17, 18, the effect of the D.C. winding(s) being controlled by a multivibrator 23, 24 of the bi-stable type which, when triggered from one stable state to the other allows the transformer to generate a peaky output and when triggered back to its initial state causes the output to be suppressed. The transformer may be controlled by a single D.C. winding connected in the anode circuit of one of the tubes of the multivibrator or, as shown, there may be two opposing windings, one of which is permanently energized from a D.C. source 22, whilst the other is energized from the multivibrator. Trigger pulses for the multivibrator may be supplied over leads 28, 29 from any of the cathodes of a multi-cathode discharge tube 25 in which the discharge transfers in succession from one cathode to the next in synchronism with the mains A.C. supply. If a single cycle of operation of the multivibrator only is required a condenser 32 may pass a negative impulse to the zero cathode of the multi-cathode tube 25, to locate the discharge on that cathode, when the valve 24 of the multivibrator is made conducting again.
Patent GB-760716-A (GB)
Title: Hydraulic hoisting device
IPC: F15B11/08
Filed: 1953-12-04
Abstract: 760,716. Stackers. MANTEN, R. Dec. 4. 1953 [Dec. 4, 1952], No. 33740/53. Class 78 (3), In a portable guided platform stacker movement of the platform is effected by an hydraulic ram which is controlled by means responsive to the presence of a load on the platform. The stacker (not shown) comprises a wheeled base supporting vertical guides along which a platform is moved by a cable passing over a pulley 28 mounted on a ram 29. With the platform lowered and unloaded fluid is circulated freely by a continuously running pump (not shown) from opening 37 through opening 36, bores in piston 9 and openings 33, and thence alongside the piston, through openings 32 back into reservoir 2. Loading of the platform moves ram 29 and piston 9 downwards to a position in which a valve 10 is engaged by a fixed pin 6 and thereby seals off openings 33. The piston then rises until it abuts a stop whereafter the valve 34 opens and allows free fluid circulation. Removal of the load from the platform allows saddle 43 to be forced upwards by spring 16 and valve 10 to be forced downwards by spring 12, thus providing two passages for the fluid through the piston and so allowing the ram to descend smoothly. The hoisting height is preset by aligning one of a set of unequal length pins 18 with a non-perforated portion of a plate 30 which is provided with holes to accommodate the remainder of the pins 18.
Patent GB-1499166-A (GB)
Title: Selective recovery of one or more components of a polymer-containing composite material
IPC: D01B9/00
Filed: 1975-08-13
Abstract: 1499166 Processing polymer-containing scrap materials NYLEX CORP Ltd 13 Aug 1975 [14 Aug 1974] 33771/75 Heading C3P [Also in Division D1] A method for facilitating the processing of a polymer-containing scrap material having a composite structure consisting of one or more polymer components and a fibre or fabric component comprises subjecting the scrap material to a dosage of high energy radiation (e.g. radiation from a Co<SP>60</SP> source or from an electron accelerator) sufficient to selectively degrade at least one of the components of the material but which leaves one or more other components substantially unchanged, whereby the treated material can be subsequently reused. In a modification of the method, the composite material treated is a co-extruded or multilayered material consisting of two or more polymeric components, at least one of which is degraded by the radiation and at least one being left undegraded. In examples the treatment is applied to PVC-coated cotton fabric; the irradiated material is subsequently processed, together with other components, to form garden hoses and shoe soles.
Patent GB-625699-A (GB)
Title: Improvements in or relating to fire-arms
IPC: F41A21/10
Filed: 1946-11-14
Abstract: 625,699. Gun barrel liners. ANSALDO SOC. ANON. Nov. 14, 1946, No. 33835. Convention date, Sept. 15, 1944. [Class 92 (ii)] A partial liner tube B is introduced into the barrel A without screwing and with little or no forcing, and bears against a retaining ring C. The arrangement is such that, on firing, the tube expands and thus ensures gas-tightness at the junction g between it and the barrel. The front end of the tube may be conical. A tube may be similarly applied to the muzzle end of a gun.
Patent GB-464518-A (GB)
Title: Improvements in permanent magnets
IPC: G01R11/10
Filed: 1935-12-09
Abstract: 464,518. Eddy - - current brakes. CHEETHAM, G. A., SYKES, C., ARMOUR, A. M., KING, A. J., and METROPOLITAN VICKERS ELECTRICAL CO., Ltd. Dec. 9, 1935, No. 34104. [Class 103 (i)] [Also in Group XXXV] A permanent magnet comprises a soft steel yoke having attached thereto at least one polepiece of high coercive force material disposed adjacent the air gap, means being provided to bend the yoke for adjusting the air gap. In the form shown, polepieces 17, 18 are welded to the yoke 14 and the air gap may be adjusted by the bolt 19 and nuts 21. In a modification the bolt is disposed between the polepieces and the bent part of the yoke. The magnet may be used for braking in an electricity meter.
Patent GB-521630-A (GB)
Title: Improvements relating to the missiles or darts used in playing the game of "darts"
IPC: F42B6/00
Filed: 1938-11-24
Abstract: 521,630. Darts. SHOWELL, A. W. Nov. 24, 1938; No. 34131. [Class 132 (iii)] The body 7 of a dart is made of coiled wire into which the tail and point are pushed or screwed. The tail and point may be formed with or attached to a piece with a stub end for engaging the coiled body. In a modification the point is brazed to the body.
Patent GB-850299-A (GB)
Title: Improvements in or relating to power operated hedge trimmers
IPC: A01G3/04
Filed: 1957-11-04
Abstract: 850,299. Hedge-cutters. BOMFORD, D. R. Jan. 27, 1959 [Nov. 4, 1957], No. 34290/57. Class 6(2). A hedge-cutter comprises a cutter bar 11 mounted on a beam 10 supported on a universal joint 22 of the construction described in Specification 645,960, which is in turn supported by a frame 12, 14, 15, 18, 19 attached to a tractor. The beam can therefore pivot about both a horizontal axis, which is parallel to the fore and aft direction of the tractor, and about a vertical axis. Adjustment about the former axis is effected from the lift links 24, 25 of the tractor, the beam 10 being connected to the links via a spring 30 and a lever 28 pivoted at 29 on the tractor. Thus by raising the lift links the cutter can be adjusted according to the height of the hedge. Once part of the hedge has been cut, the cutter can be partially supported by the skid 31 resting upon the hedge, the lift links being lowered slightly so that the beam 10 is then floating and any pitching or rolling of the tractor is compensated for by the spring 30 instead of being translated to the cutter. Pivotal movement of the beam 10 about a vertical axis is controlled by a flexible inextensible, but adjustable tether 38 which is normally maintained in a taut condition by a spring 35. In an alternative arrangement, the tether is of fixed length, and the frame members 18 and 19 are pivoted to the frame member 12. The joint 22 may be mounted on a crank which is in turn pivotally supported on the frame 12, and by turning the crank with the aid of a handle, lengthwise movement of the beam 10 is effected to free the cutter from obstruction. The cutter may be driven through a system of belts and pulleys from the power take off of the tractor, or alternatively an electric motor may be mounted in the place of the counterweight 34.
Patent GB-657098-A (GB)
Title: Improvements in sound detectors
IPC: G01S1/72
Filed: 1947-12-29
Abstract: 657,098. Locating sounds. AUSCHER, J. Dec. 29, 1947, No. 34338. Convention date, March 13, 1940. [Class 118 (ii)] A sound detector which comprises a stationary support, and at least one rotatable frame mounted thereon carrying two listening horns, each connected by a tube to an ear-piece is characterized in that the listening horns in addition to moving with the rotatable frame can be orientated in two mutually perpendicular planes, one of which is itself perpendicular to the plane of rotation of the said frame. As described, the detector is employed to determine the azimuth and elevation of an aircraft. Azimuth. Two listening horns 15, 16 are pivoted in forks 13, 14 on graduated rods 11, 12 (Figs. 1 and 2), slidably mounted in a tubular cross-member 10 which is rotatably supported by an upright 9. The listening horns 15, 16 are connected by tubes 22, 23 to an operator's head-set and to determine the azimuth of a sound source the operator rotates the cross-tube 10 horizontally by means of a handle 17 until he obtains an equal response inboth ears, the crosstube being rotated in a vertical plane to obtain maximum intensity. The azimuth is read off from a pointer 18, bearing a lamp 19, in conjunction with a scale 4. The scale can be rotated in order to set it correctly with respect to North and then locked in position with a lever-nut 6 which can also be inserted in holes 7 in levelling screws 3 to adjust the level of the apparatus. The horns 15, 16 may be turned outwards about their pivots until the particular operator obtains optimum results. Elevation. A base 24, Fig. 3, is levelled and a rotatable scale 27 correctly orientated and locked in position by a wing-nut 30. A tripod 1 bearing a cross-tube 38 pivoted at 41 is then rotated by a lever 33 until a pointer 31 bearing a lamp 32 indicates on the scale 27 the azimuth already determined. The lever 33 is then released and applies braking means (not shown) via a rod 34 to lock the tripod in position. By means of the handle 51 the operator moves the cross-tube 38 about its pivot 41 until he receives an equal response in both ears, the elevation of the sound source being indicated by a pointer 43 and lamp 44 in conjunction with a scale 42. The mounting of the listening horns is similar to that already described. Listening horns. The listening horns may be formed of three segments 54, 55, 56, Fig. 4, the sensitivity being adjusted by varying the number of segments in use. In another form, Fig. 5, the horn comprises a funnel 57 and a resonator 58 containing a combined deflecting surface 59 and reflecting surface 60 which can be adjustably located along the axis 61. Either type of horn may be elliptical in cross-section, the major axis being perpendicular to the plane of sweep, i.e. vertical in the case of the azimuth apparatus.
Patent GB-440455-A (GB)
Title: Improvements in or relating to incandescent electric lamps
IPC: H01K1/32
Filed: 1934-11-30
Abstract: 440,455. Electric incandescent lamps. CONTI, J. T. F., 52, Rue de Clichy, Paris. Nov. 30, 1934, No. 34392. [Class 39 (ii)] An electric incandescent lamp has a reflecting surface which is generated by the rotation of the opposite branches 2, 3 of two coaxial parabolas of different focal lengths and having a common vertex on their common axis, about a line XX at right angles to the common axis and further away from the vertex than either focus f<1>, f<2>. The filament 4 is shaped as an arc of a circle concentric with the axis XX, and is disposed between the circular arcs generated by the foci f<1>, f<2> of the parabolas 2, 3 respectively. Half the surface of the bulb is silvered. The filament is in two parts and is supported by three conducting supports so that the two parts may be connected to the source of current either in series or in parallel.
Patent GB-1482290-A (GB)
Title: Switching means
IPC: H01H47/00
Filed: 1974-08-05
Abstract: 1482290 Summing circuits HEWLETT PACKARD Ltd 5 Aug 1974 34461/74 Heading G4G [Also in Division H3] The effect of capacitances Cs of transistor or other switches is reduced by connecting their outputs to the vertical earth terminal of a negative feedback amplifier and connecting the back contacts to earth. The circuit may be used for summing or scanning and the gain and frequency response may be determined by selecting the ratio of impedances Ri to Rf.
Patent GB-1280432-A (GB)
Title: A process for the manufacture of polyene compounds
IPC: C07B37/00
Filed: 1970-07-16
Abstract: 1280432 Polyene compounds F HOFFMANN-LA ROCHE & CO AG 16 July 1970 [1 Aug 1969 31 Oct 1969] 34484/70 Heading C2C [Also in Division C5] Polyene compounds of the general formula in which the R-residue has the same significance and each represents the formyl residue, an alkoxy carbonyl residue or the 4,8-dimethylnona-1,3,7-trien-1-yl residue are prepared by reacting in the presence of an ethylene oxide which may be substituted by C 1 -C 5  alkyl, either a dialdehyde of the general formula in which a and b stand for zero, with a phosphonium salt of the general formula in which c stands for 1, Y represents an aryl or di(C 1 -C 4  alkyl)amino group and Z represents a halogen or hydrosulphate ion, or a dialdehyde of Formula II in which a and b represent 1 with a phosphonium salt of the formula in which c stands for zero, R<SP>1</SP> represents the 2,6- dimethyl-hepta-1,5-dien-1-yl residue, or a dialdehyde of Formula II in which a represents zero and b represents 1, with a phosphonium salt of the general formula Examples describe the preparation of crocetin dialdehyde, crocetin dicetyl, dimethyl and diethyl esters.
Patent GB-932207-A (GB)
Title: Improvements in or relating to saw-tooth wave generators
Inventor: JULIAN JOHN DERTAD
IPC: H03K4/24
Filed: 1960-10-07
Abstract: 932,207. Saw-tooth circuits. MARCONI INSTRUMENTS Ltd. July 24, 1961 [Oct. 7, 1960], No. 34501/60. Class 40 (6). A saw-tooth generator comprises a capacitance 16 in series with a valve 14 or transistor and a resistor 15, the charge being linearized by means of a unity-gain stage 6 fed from the voltage across the capacitance 16 and feeding the control electrode of the charging device 14 via a constant potential device 12. The circuit shown in Fig. 4 can operate either as a " bootstrap " timebase (when switch S is set to position A) or, when switch S is thrown to position B, as a Miller timebase. When the electronic switch 19 is closed, valve 18 is rendered non-conductive so that the stray capacitance 16 can charge via valve 14 and resistor 15. The charge is made linear by " bootstrap " feedback via cathode follower 6 and the gas-filled constant voltage tube 12. The sweep is terminated by opening the electronic switch 19 so that valve 18 is rendered conductive, discharging the capacitance 16. The voltage across capacitance 16 at the beginning of the sweep is stabilized by feedback via cathode followers 6, 25 and diode 23 to the control grid of valve 18. When switch S is thrown to position B, a low-speed sweep is provided by the Miller capacitance coupled by cathode follower 6. Specification 867,406 is referred to.
Patent GB-506835-A (GB)
Title: Tension attachment to bows of string instruments
IPC: G10D3/16
Filed: 1937-12-14
Abstract: 506,835. Violin &c. bows. HOGGARD, C. W. Dec. 14, 1937, No. 34541. [Class 88 (ii)] To strengthen the stick without materially adding weight, and to produce adjustable tension on the hair without unduly straightening the curve of the stick, a wire E is stretched between two light clamps A, B, its tension being adjustable by a nut F screwing on a sliding piece D. A guide H also clips the wire to the stick. A screw K acting within the frog takes up slack in the hair.
Patent GB-1246759-A (GB)
Title: Improvements in or relating to braking control systems
Inventor: CHEVREUX G
IPC: B60T1/06
Filed: 1970-07-17
Abstract: 1,246,759. Brake control systems; valves. SOC. ANON. D.B.A. 17 July, 1970 [1 Aug., 1969], No. 34701/70. Headings F2F and F2V. In a system for controlling actuation of at least one brake mechanism provided with primary and secondary brake actuating means operatively controlled by a service braking fluid pressure control circuit and an emergency braking control circuit respectively, a pressure relief valve 38 controlled by the emergency braking control circuit is operatively provided in the service braking control circuit for terminating the normal braking fluid pressure supply to the primary brake actuating means and for connecting the latter to a relatively low fluid pressure reservoir upon actuation of the emergency braking control circuit. As shown, the front and rear brakes 18, 20 of a vehicle are actuated by a master cylinder 8 having a reservoir 40 and the rear-brakes are additionally, actuated by a hand lever 30 and cable 32 connected to a lever 34 which operates an actuator 26 located between the free ends of brake shoes 31, 33. Upon displacement of the lever 30 the plunger 48 is urged to the left, as seen in the Figure, to cause closing of a tipping valve 42 and simultaneous opening of a check valve 50 whereby brake pressure fluid released from the actuator 16 passes to the reservoir 40 via. an outlet chamber 46 of the relief valve 38.
Patent GB-1006454-A (GB)
Title: Improvements in or relating to self-supporting roofs
IPC: E04B7/10
Filed: 1961-09-28
Abstract: 1,006,454. Roofs; roofing units. B. O. ZEINETZ. Sept. 28, 1961 [Oct. 1, 1960; March 23, 1961], No. 34833/61. Headings E1B and E1V. A self-supporting roof having a curved shell comprises panel elements held together under compression by tension members under strain, the tension members being clamped together at the corners of the panel elements by coupling members. As shown for a cupola or funnelshaped roof having a peripheral girder, panel elements a 1 , b 2 , c 2 , d, etc., are compressed and held together by tension members, which may be of H-section and are joined at the corners of the elements by coupling members in the form of pins, bolts, or screw-threaded connectors. The tension members may fit into grooves in the panel elements and grooves may also be provided in the elements for sealing material. The elements may each be curved, curved in two directions, or folded, and of glass, foamed glass, wood, plastics, concrete, or in layers of metal, fibreboard, wood wool, cardboard, and porous concrete. A sound-absorbing facing of fibre-board with closed-ended holes may be included.
Patent GB-1107578-A (GB)
Title: Mineral mining machines
Inventor: HEYER WILLY
IPC: E21C27/34
Filed: 1965-08-13
Abstract: 1,107,578. Mineral-mining machines. GEWERKSCHAFT EISENHUTTE WESTFALIA. 13 Aug., 1965, No. 34837/65. Heading E1F. The cutter means of a mineral-mining machine are powered from an intermittently re-energisable fly wheel type energy storage means mounted in the machine. A cam-operated hydraulic transmission driven by a fly wheel may cause percussing of the picks of a plough, or an out of balance fly wheel or wheels may set up vibratory pulses in a plough, or a cutter drum or disc may be rotated by a flywheel.
Patent GB-787296-A (GB)
Title: Improvements in or relating to removing impurities from platinum
Inventor: APPELL HERBERT RUDOLPH
IPC: C01G55/00
Filed: 1955-12-06
Abstract: Aqueous solutions containing platinum as part of a complex anion and also containing a cation impurity are purified by contacting the solution with a solid cation exchange material which absorbs the cationic impurity.  The cation impurity may be copper, nickel, iron, manganese, magnesium, sodium or potassium. The platinum metal anion may be one containing F, Cl, Br, I, CN, NH2, NO or OH, for example chloroplatinic bromoplatinic, iodoplatinic fluoroplatinic, bromoplatinous, iodoplatinous, bromo-chloroplatinic, bromo-chloroplatinous, cyanoplatinic, aminoplatinic, nitrosoplatinic, hydroxyplatinic, the corresponding platinous acids or cyanochloropoplatinic, or hydroxy-chloroplatinic acid.  The preferred cation exchangers are strongly acidic, such as sulfonated coal or carbonaceous zeolites orsynthetic resins of the phenolic or non-phenolic type, in particular a sulfonated copolymer of styrene and divinylbenzene. These materials may be employed as powders or chips or spheroids. The cation exchange material may be regenerated with an acid solution, and if a small amount of platinum is retained on the cation exchanger it may be removed with water washing and the solution so obtained may be contacted with an anion exchanger which picks up the platinum anion.  The anion exchange material may then be burned to leave an ash of the platinum which may be taken up in water and re-purified.  According to examples: (1) platinum containing minor percentages of iron and copper impurity were dissolved in aqua regia the solution evaporated to dryness and the resulting salt dissolved in distilled water.  The solution was then again evaporated to dryness and the salt again dissolved in water and the resulting chloroplatinic acid solution containing the copper and iron impurities was passed through a bed of commercial "Amberlite" (Registered Trade Mark) cation exchange resin whereby the iron and copper impurities were retained.  (2) Platinum containing iron and copper was dissolve in aqua regia as in Example (1) and the solution of chloroplatinic acid resulting was passed through a phenolic type cation exchange resin which freed the chloroplatinic acid from iron and copper impurities. The resin was then washed with distilled water to remove traces of platinum therefrom and the resulting solution contacted with an anion exchange resin of low ash content which picked up the platinum from the solution.  The anion exchange material was then burned and the resulting platinum containing ash was dissolved in aqua regia and purified as before.