baber/WOPTO huggingface dataset:
Patent GB-1473592-A (GB)
Title: Converter circuits
IPC: H02M3/337
Filed: 1974-09-23
Abstract: 1473592 Automatic voltage and current control WESTERN ELECTRIC CO Inc 23 Sept 1974 [26 Sept 1973] 41245/74 Heading G3R [Also in Division H2] In a converter having automatic voltage regulation, an over current protection circuit includes a capacitor 89 having a charging circuit and arranged to be discharged in response to the output current exceeding a reference value and means for modifying the voltage regulation circuit in dependence on the charge on capacitor 89, the arrangement being such that the response speed is faster for a large over current than for a small one. Fig. 1 (not shown) depicts a D.C.-D.C. converter comprising a pair of pulse-width modulated transistors directing current to opposite sides of the primary of a transformer, the output of which is rectified and filtered to feed a load. The output voltage is monitored at 40 and compared with a reference 52, the error voltage being arranged to charge capacitor 61 which is discharged by means of a clock 48 twice per cycle of the main converter. The charge on 61 is monitored by transistor 63 and the duty cycle of a multi-vibrator 71 adjusted so as to maintain constant output voltage. The D.C. input current is monitored by resistor 17 and amplified at 19, capacitor 91 being included so that the circuit responds mainly to the A.C. component. This signal is fed to transistor 75 where it is compared with a reference 95 fed to transistor 78 such that the transistor 75 becomes  conductive when the current signal exceeds the reference 95, so periodically to discharge capacitor 89, previously charged from a D.C. source Vs via resistor 81. The charge on 89 is monitored and inverted by transistor 82 and fed via a diode 83 to amplifier 51 so as to modify the error voltage at 54 and so modify the duty cycle of the output and thus reduce current overload. The charging time constant of capacitor 89 is much greater than the discharging time constant, hence, during large increases in output current, 89 discharges for a longer duration in each switching period and so corrects the overload more quickly. The circuit 19, 91, 92 is stated to have a fold back characteristic Fig. 5 (not shown). Balancing current in two halves of a push-pull transformer. The current signal from amplifier 19 is passed via a blocking capacitor 85 to an amplifier 86 which compares it with a reference 90 during each half cycle and modifies the charge on capacitor 61 so as to tend to equalize the current in the two half cycles and thus prevent saturation of the output transformer.
Patent GB-947285-A (GB)
Title: A method of controlling thermal processes performed on travelling grates
IPC: C22B1/20
Filed: 1962-10-31
Abstract: 947,285. Electric correspondence control systems. METALLGESELLSCHAFT A. G. Oct. 31,1962 [Oct. 31,1961], No. 41257/62. Heading G1N. The rates of feeding material constituents to be sintered on to a travelling grate conveying them to an oven are conjointly controlled in accordance with the speed of the grate, as measured by a tachogenerator. As shown (Fig. 2), a number of hoppers V1-V6 containing the various material constituents, are discharged through weigh feeders D1-D6 to blending drums M1, M2, where the materials are mixed with controlled quantities of water before being sintered at SM and cooled at SK. The speed of travel of the sinter grate as measured by a tachogenerator is used to control (a) the rate of delivery from each hopper V1-V6 while maintaining a predetermined proportionality, (b) the rate of feeding the blended mixture on to the travelling grate SM, (c) the speed of the sinter cooler SK. These controls may be effected directly or indirectly, and modified by signals representing the moisture content of the mixture in the blending drums M1, M2, the height of material in the feed hoppers A, Z,and the height of material on the travelling grate SM and on the sinter cooler SK.
Patent GB-1588517-A (GB)
Title: Preparation of m-aryloxybenzyl chloride and m-aryloxybenzal chloride
IPC: C07C67/00
Filed: 1976-10-06
Abstract: A process for the preparation of a mixture of a meta-phenoxybenzyl chloride and a meta-phenoxybenzal chloride, which comprises chlorinating a meta-phenoxytoluene with sulphuryl chloride in the presence of a free-radical initiator under conditions such that the formation of ring-chlorinated derivatives is minimized.
Patent GB-1467480-A (GB)
Title: Syringe assembly including a separate vial and injector
IPC: A61M5/24
Filed: 1974-09-24
Abstract: 1467480 Medicament injectors ABBOTT LABORATORIES 24 Sept 1974 [25 Sept 1973] 41567/74 Heading A5R A medicament injector 12 adapted to receive a medicament containing vial 11 having a stopper 16 movable therein and provided with internal threads 17, comprises an integral polypropylene holder 30 including a post 32 having a cannula 31 moulded therein, the post extending along a major portion of the cannula and having a hub 33 on the distal end 25 from which one end of the cannula projects and a threaded stem 38 on the proximal end 26 from which the other end of the cannula projects, the threads being interrupted to facilitate removal from a mould, and a pair of opposed, longitudinally extending wings 41 which project from a laterally extending base 40 adjacent the hub towards the threaded stem. The vial is received on the post by screwing the stopper onto the threaded stem whereupon the cannula pierces a diaphragm 18 of the stopper and medicament may then be forced down the cannula by pushing the vial into the holder, the stopper being restrained on a stop 37 on the post. The post is preferably of cruciform shape, but may alternatively have a circular or square crosssection. The vial is made of glass. A cap (50) Fig. 2, (not shown), may be positioned over the stem 38 and the portion of the cannula which projects therefrom prior to the positioning of a vial on the stem in order to maintain the stem sterile, the cap being removable by applying pressure to the wings. A stiffener rib 45 is moulded into holder 30.
Patent GB-926597-A (GB)
Title: An abrasive tumbling machine
IPC: B24C3/26
Filed: 1961-11-21
Abstract: 926,597. Drive chains. BELL INTERCONTINENTAL CORPORATION. Nov. 21, 1961 [Dec. 14, 1960], No. 41578/61. Class 24. [Also in Groups XXIII and XXX] An abrasive tumbling-machine has a conveyer mechanism including an upper drive shaft, a pair of horizontally-spaced idler shafts, a conveyer flight trained on the shafts and presenting a work-receiving pocket between the drive shaft and one of the idler shafts, drive-imparting means carried by the drive shaft and engaged with the conveyer flight for moving the latter and auxiliary support means carried by the drive shaft and engageable with the conveyer flight as the same passes over the drive shaft, to relieve the drive-imparting means of substantially all loads excepting the drive load. A drive shaft 10 rotatably supported by the machine frame has sprockets 12, 14 carrying endless chains 16, 18. The links are connected by pins 34 passing through aligned openings in arms 20, 22 of a link and through a bore in the nose 24 of the adjacent link. Integral with the main body portion of each link is a lateral extension 38 having a canted flat upper surface 40 with openings 42 to receive fasteners for securing one end of a conveyer flight plate 46. Each lateral extension 38 has an arcuate undersurface 48 bearing against the periphery of an auxiliary support roller 50 or 52. Each of the latter is in two parts 54, 56, produced by cutting a roller in half after machining, the parts being aligned when re-assembled by locating pins 58, 60 which may be welded to one part. The parts are hardened by heat treatment and have pairs of bores 68, 70, preferably countersunk, through which extend screws engaging tapped openings in the hubs 74, 76 of the sprockets 12, 14.
Patent GB-415898-A (GB)
Abstract: 415,898. Cooldng-stoves. SOUTHERN, G. W., 34, Knowle Lane, Ecclesall, Sheffield. Oct. 10, 1933, No. 27839. [Class 126.] A cooking stove comprises a boiler b at one side of the fireplace ; a flue c between the boiler and an oven e ; a short horizontal flue d leading from the fire to the bottom of the flue c and to a flue f extending around the bottom, outer side, and top of the oven ; dampers m, k, n respectively in the flues f, c, and the chimney flue ; and an adjustable hot-plate cover h provided with a baffle i and arranged immediately over the flue c. In the form shown the baffle comprises a substantially semicircular wall extending downwardly into the flue so that the gases impinge on it and impart some of their heat to the cover h. By rotating the cover, the retarding effect of the baffle on the gases may be varied. In the combination fireplace shown, air heated by passing under the open grate a is delivered through openings a<1> in the front and rear ends of the flue d to the gases passing through it. Specification 388,546 is referred to.
Patent GB-1134825-A (GB)
Title: Cap forming apparatus and method
Inventor: VOSS JOSEPH MERYL
IPC: B21D51/46
Filed: 1965-10-20
Abstract: 1,134,825. Feeding caps; container closures. CHEMETRON CORP. 20 Oct., 1965, No. 41620/65. Headings B8S and B8T. [Also in Division B3] An embossed aluminium closure cap has a liner 11 of vinyl coated paper or paperboard positioned below an inwardly projecting bead 211; a knurled surface 209 and circumferentially spaced apart slits 204 positioned centrally of an outwardly projecting bead in order to render the cap tamperproof. During the manufacture of the caps, cap blanks are transferred in single file with their open ends in alignment to a shoot 83, Fig. 6. An incorrectly aligned cap is stopped by a star wheel 84 and may be manually removed through a door 88. Each cap is removed from the shoot 83 to an embossing and trimming machine by one of a number of circumferentially spaced rotating spindles 87 mounted on a rotating carrier (112), (Fig. 12, not shown). A roller 99, Fig. 9, is deflected by one of the spindles 87 to cause via linkage a cap to fall from a projection 93 on to a yieldable stop 105, from where it is picked up and held by the rotating spindle 87. A solenoid actuated stop 89 prevents the cap feed to the embossing and trimming machine if the processed caps accumulate in the conveyer (not shown) extending between the embossing machine and the following processing machine.
Patent GB-934532-A (GB)
Title: Improvements in and relating to the sealing of bottles and other containers
IPC: B65D53/04
Filed: 1959-12-08
Abstract: 934,532. Container closures. C. D. WALLER. Dec. 8, 1959, No. 41768/59. Addition to 710,470. Class 125(3). A sealing wad as described in the parent Specification is modified in that the wad has a concave portion 3 in its upper surface having a projection 4 at its centre surrounded by a ring 5. A secondary seal may be provided by an annular ring 8. In a modification, Fig. 2 (not shown) the protuberance 2 on the lower side of the wad has a smaller concentric protuberance on its surface enabling it to seal a container having a smaller opening. The wad may be of polythene. Specification 934,533 also is referred to.
Patent GB-905722-A (GB)
Title: Process for the preparation of threo-l-p-nitrophenyl-2-acylamino-propan-1,3-diols
Filed: 1959-12-10
Abstract: Threo-1-p-nitrophenyl-2-acylamino-propane-1,3-diols are prepared by reducing a p-nitro-a -acylamino-b -hydroxy-propiophenone with calcium borohydride.  The reduction is preferably carried out in an alcohol solvent at -25 DEG  to -35 DEG C. and the resulting mixture of isomers, which contains predominantly the threo isomer, separated. The calcium borohydride may be prepared in situ from sodium borohydride and a calcium halide.  In the examples a -acetamido and a -dichloroacetamido compounds are reduced.  The process of Specification 854,200 is disclaimed.  Specifications 711,018 and 739,127 and German Specification 931,829 are referred to.
Patent GB-972803-A (GB)
Title: Desulphurisation of hydrocarbon materials
IPC: C10G67/12
Filed: 1961-11-24
Abstract: Hydrocarbon materials containing 1% or more by weight of sulphur, especially petroleum fractions containing material boiling above 250 DEG  C., for example crude oil and atmospheric and vacuum residues, are desulphurized by submitting the material to separate and successive treatment stages, one stage comprising an oxidative desulphurization treatment, and the other stage comprising a hydrocatalytic desulphurization treatment, the oxidative treatment comprising a selective oxidation reaction in which the sulphur-containing compounds are selectively attacked, for example by air or oxygen, desirably in the presence of a promoter such as a Group 5A or 8 metal, metal salt, or metal oxide, especially Pt, Pd, Ni and V, on a support, followed by a thermal decomposition step in which the sulphur is eliminated as a sulphurous gas.  Other suitable oxidizing agents include organic and inorganic peroxides, hydroperoxides and per acids, chlorine, nitrogen oxides, and ozone. Preferred hydrogenation conditions are 500-900 DEG  F., 100-2500 p.s.i.g. SV 0.1-10 v./v./hr., hydrogen recycle rate 500-5000 SCF/B. The oxidative and hydrogenative stages may be carried out in either order. Specification 949,392 is referred to.
Patent GB-1176460-A (GB)
Title: Pocket Receiver for Private Calling Systems
IPC: H04B1/16
Filed: 1968-09-05
Abstract: 1,176,460. Inductive signalling; radio receivirig apparatus. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 Sept., 1968 [8 Sept., 1967], No. 42209/68. Headings H4L, H3Q and H4U. A pocket receiver for a paging system is provided with a transistor switch, operated by contacts on a spring clip for holding the receiver in a pocket, which automatically switches off the receiver when it is removed from the pocket. The battery supply terminal 3 of the receiver 1 is connected via the emitter-collector path of a transistor 6 to the battery 5, the terminal 4 being connected direct to the battery. The base of the transistor is connected to the positive terminal of the battery through a resistor 7 so that the transistor is conductive when a switch 8 is open. When the receiver is removed from the pocket switch 8 formed by the spring clip is closed and transistor 6 is made non-conducting. A spring-loaded insulating plate may be arranged on the housing of the receiver so that it can be moved between the clip contacts to put the receiver into operation, the plate being displaced automatically from the contacts when the clip is clamped on a pocket.
Patent GB-1059665-A (GB)
Title: Improvements in or relating to the manufacture of body bands for fluid flow control valves
IPC: F16K27/04
Filed: 1965-10-05
Abstract: 1,059,665. Making valves. GROVE VALVE & REGULATOR CO. Oct. 5, 1965 [Oct. 21, 1964], No. 42270/65. Addition to 911,408. Heading B3A. A valve body band, which is clamped around the periphery of a fluid flow control valve (35) (Fig. 14, not shown) between two parallel end walls (34), is formed from a ring 10 of rectangular cross-section to which is welded a shaped head 11. The two annular end faces of the assembly are grooved and the ring is deformed to an elongated oval configuration. The end faces, are then either ground to size, or the radially inner wall (28a) (Fig. 10, not shown), is cut in height, any distortion in the cross-section due to deformation to the elongated oval shape being accommodated during clamping by the end walls (34) of the valve.
Patent GB-925636-A (GB)
Title: Improvements in or relating to surface grinding machines
Inventor: WADE GEORGE COLLINS
IPC: B24B27/00
Filed: 1961-11-27
Abstract: 925,636. Surface grinding machines. REPCO AUTOMOTIVE EQUIPMENT CO. PTY. Ltd. Jan. 25, 1962 [Nov. 27, 1961], No. 42336/61. Class 60. The grinding head 4 of a surface grinding machine is supported by a reciprocatory hanger 17 of inverted L-shape mounted for manual movement lengthwise of a pair of vertically-spaced rails 7, 8, one leg of the hanger 17 depending in front of the lower rail whilst the other leg 19 overhangs an adjustable work-support and carries the vertically adjustable grinding head; a handle 37 enables the head to be traversed between spring stops 46, Fig. 4, located adjacent the upright limbs 3 of the machine frame, between which the rails 7, 8 are supported. Trackways are provided on the rails for rollers 22 and 24, the latter having means for lateral adjustment whereby the grinding head axis is maintained in its vertical position. The grinding wheel spindle 29 is motor-driven within a vertically adjustable sleeve 26 externally screwed at 34 and rotatable by a handwheel 36. Coolant is supplied to a trough 41 formed in the upper portion of the grinding-wheel supporting means, perforations 42 therein allowing the coolant to flow to the wheel and work and then to drain into channels 44 in the base of the machine, whence it is recirculated. The work, e.g. a motor cylinder block, is held by adjustable clamps 72, 74 carried by channel members 76 secured to upright supporting member 66 either above or below their upper flanges by cross-bars 68 secured by anchor bolts 69 to the base 2; when in the lower position the cross-bars engage holes 67 in the supports 66. Sets of supports 66 of different height may be used. The traverse of the head 4 on the rails 7, 8 may be limited by adjustable stops 46 carried at the opposite ends of a shaft 47, Fig. 4, slidably mounted in lugs 48 bolted to the ends of the rail 7 and having shockabsorbing springs 58 interposed between shouldered collars 51 and adjustable abutments 52 so that axial movement of the shaft in either direction is spring-resisted. The stops 46 are secured by clamping screws 62 which engage in the selected recesses 63 on the shaft.
Patent GB-918384-A (GB)
Title: Arc welding
IPC: B23K9/12
Filed: 1960-12-12
Abstract: 918,384. Welding by fusion. AIR REDUCTION CO. Inc. Dec. 12, 1960 [Dec. 24, 1959], No. 42737/60. Class 83 (4). In arc welding in which a consumable electrode is fed first through a contact device and then through a guide insulated from the contact device, but connected in parallel to the welding supply, the guide is disconnected from the welding supply after the arc is struck. When welding is to be started, a switch 33 is operated to supply current to the feed motor control circuit 27 and to energize a relay 19 which connects the guide 8 in parallel with the contact tube 7. The electrode 1 is fed at a slow speed depending on the setting of a potentiometer 37 until the arc is struck, whereupon relay 22 operates relay 23 to gradually increase the feed rate to the normal welding speed set by potentiometer 43 and to complete a circuit for a time delay relay 29. After full speed is reached, relay 29 disconnects 19 so that all the welding current passes to the contact tube 7. The arrangement is applicable to surfacing using a substantial projection of the electrode beyond the contact tube 7 to increase the resistance heating effect. The electrode or the work may be oscillated to increase the bead width and a shielding gas, e.g. argon or helium with, if desired, 1-5% oxygen, or carbon dioxide may be used.
Patent GB-901795-A (GB)
Title: Glass cutting apparatus
IPC: C03B33/037
Filed: 1960-01-13
Abstract: 901,795. Cutting sheet glass. PITTSBURG PLATE GLASS CO. Jan. 13, 1960 [Jan. 19, 1959], No. 42859/61. Divided out of 901,794. Drawings to Specification. Class 56. Apparatus for cutting glass sheet comprises conveyer means to move in a given path a glass sheet having a leading edge, a carriage above the conveyer means adapted to move from a home position along a path parallel with that of the glass sheet, a glass scoring tool mounted on the carriage for movement thereacross to spore the shest transversely, the carriage being moved by vacuum cups mounted on the carriage and having a raised position and a lowered position in engagement with the glass sheet where they are evacuated, means to accelerate the carriage from the home position and means to sense the position of the leading edge of the moving glass sheet and thereby initiate the movement of the carriage, the lowering of the vacuum cups and the transverse movement of the glass scoring tool. The apparatus disclosed is identical with that of the Specification 901,794. Specifications 900,983 and 901,796 also are referred to.
Patent GB-1395996-A (GB)
Title: Dc motor circuits
IPC: H02P3/14
Filed: 1972-09-15
Abstract: 1395996 Braking D.C. motors ASSOCIATED ELECTRICAL INDUSTRIES Ltd 14 Sept 1973 [15 Sept 1972] 42889/72 Heading H2J A D.C. motor circuit comprises a braking arrangement wherein the armature 12 is connected in a first series circuit with the field winding 11, in a second series circuit with a load resistance 5 and in a third series circuit with the D.C. supply terminals, and circuit means are provided and are arranged to control the series circuits cyclically so that in a first part of a cycle energy is generated by rotation of the armature 12 in the first circuit, in a second part aportion of this energy is dissipated in the resistance 5 and in a third part a portion of this energy is returned to the D.C. terminals. In a preferred embodiment the first circuit comprises thyristors 2, 3, field coil 11, resistor 13 and armature 12, the polarities of the thyristors being such as to pass currents generated by movement of armature 12. In the first part of the cycle both thyristors are fired and energy is stored in the winding 11 and the polarity of the right hand plate of the commutating capacitor 4 rises to that of the positive D.C. rail. Thyristor 1 is then fired causing a reverse bias to be applied across thyristor 2 turning it off thereby terminating the first part of the cycle and the polarity of capacitor 4 commences to reverse. The field winding 11 is included in a freewheel circuit comprising diode 10, resistor 13 and saturable reactor. The effect of this reactor is to delay the build-up of field current in the freewheel circuit after termination of the first period and to cause the right hand plate of capacitor 4 to reach a lower negative potential owing to field e.m.f. acting through thyristor 3. As the current builds up when the reactor saturates the thyristor 3 is reverse-biased and extinguished. The second circuit now in operation comprises the thyristor 1, resistance 5, diode 9, resistance 13 and armature 12, and rheostatic braking takes place. The second part of the cycle is terminated by firing thyristor 2 to extinguish thyristor 1 and regenerative braking via diode 9, resistor 13 then occurs. At low speeds, the generated armature current will be insufficient to maintain diode 9 forward-biased against the free-wheeling current and this latter will then be identical with the armature current. In a modification, Fig. 2 (not shown), resistor 13 is omitted and the anode of diode 10 connected to the negative D.C. supply line.
Patent GB-1528077-A (GB)
Title: Electronic timepiece
IPC: G04G3/00
Filed: 1976-10-15
Abstract: 1528077 Electronic timepieces DAINI SEIKOSHA KK 15 Oct 1976 [23 Oct 1975] 42967/76 Heading G3T In an electronic timepiece having a quartz crystal controlled oscillator circuit for producing a time standard signal, the crystal has a "turning point temperature" in the range between 14‹C and 18‹C. The turning point temperature is the temperature at which the rate of change of #f/f is zero i.e. the temperature T px  in curve B Fig. 2 wherein #f is the frequency deviation of the oscillator between temperatures T px  and T px  + α. Curve A is in respect of a conventional quartz oscillator in a timepiece.