baber/WOPTO huggingface dataset:
Patent GB-787333-A (GB)
Title: Improvements relating to circuit arrangements incorporating semi-conductor devices
IPC: H01L29/00
Filed: 1954-09-20
Abstract: 787,333. Semi-conductor devices. WESTINGHOUSE BRAKE & SIGNAL CO., Ltd., and WALKER, A. H. B. Aug. 24, 1955 (Sept. 20, 1954], No. 27202/54. Class 37. [Also in Group XXXV] Controllable current is supplied from an A.C. source such as transformer 9 to a load 4 connected in series with the collector electrode 2 of a semi-conductor device having a base electrode 3 and an emitter electrode 1 which receives current from a source 11 during at least part of alternate half-cycles of the supply, the flow of load current being blocked by rectifier 7 during other half cycles. The emitter current 14 comprises a sinusoidal component 12 and a D.C. component 17 which is variable to alter the duration of the period of load current flow, when current 14 is greater than value 13 of the current which is adequate to bottom the semiconductor device. The power loss during the period when the emitter current is less than adequate may be reduced by employing A.C. with a steep waveform. The control may alternatively be by phase shift of the emitter A.C. to adjust the instant of supply of adequate current. In a modification the load circuit is connected between the emitter and collector electrodes, Fig. 3 (not shown). Fig. 9 shows the circuit of Fig. 2 including a semi-conductor device comprising an N-type base electrode 3 sandwiched between P-type emitter and collector electrodes 1, 2, the rectifier 7 being a P-N rectifying junction produced by forming a further N-type electrode on the surface of the collector electrode 2.
Patent GB-655561-A (GB)
Title: Device for transforming a sinusoidal wave into a periodic wave, the sinusoidal components of which are of frequencies which are harmonics of the frequency of the wave tobe transformed
IPC: H03K12/00
Filed: 1947-10-10
Abstract: 655,561. Sawtooth generating circuits. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. Oct. 10, 1947, No. 27290. Convention date, Nov. 9, 1946. [Class 40 (vi)] [Also in Group XL (a)] A sawtooth waveform is derived from a sinusoidal waveform by applying this voltage to a circular scan in a cathode-ray tube in which the beam impinges upon a resistive plate which is swept by the beam and is subjected to sudden periodic variations so that a sawtooth voltage waveform is generated between the ends of the resistance. The Figure shows a cathode-ray tube in which a circular scan is obtained from a sinusoidal waveform and causes the electron beam 5 to sweep round the resistive plate 6 so that the voltage between the ends A and B varies in a sawtooth manner and is applied to the grid 7 of an amplifying valve. In a modification, Fig. 5 (not shown), the single resistance of circular shape is replaced by a chain of resistive plates arranged around the circumference of a circle so that if n such plates are used the frequency of the sawtooth will be n times that of the sine wave from which it is derived. In a further modification, a number of concentric resistances are used each consisting of different numbers of resistive plates so that a number of harmonically related sawtooth output voltages may be obtained.
Patent GB-481755-A (GB)
Title: Improvements in oil coolers
IPC: F16N39/02
Filed: 1936-10-08
Abstract: 481,755. Radiators for aircraft. ROBERTSON, J. H. Oct. 8, 1936, No. 27336. [Class 29] An air-cooled oil cooler for aircraft engines comprises groups of tubes a ... f connected between headers and through which the oil normally flows in series from an inlet o to an outlet p. The tubes of the group f are larger than those of the other groups and preferably of oval or streamline cross-section, and oil may be byepassed through the group f directly from the inlet to the outlet by a pressure relief valve k. The air flows laterally across the tubes from left to right and is thus heated by the tube group f before passing over the other groups of smaller tubes. This tends to prevent congelation of oil in the latter groups. Specification 467,420 is referred to.
Patent GB-680349-A (GB)
Title: Improved means for setting two-part pit props
IPC: E21D15/58
Filed: 1949-10-25
Abstract: 680,349. Setting devices for pit props. BRAND, J., and RITCHIE, C. Oct. 25, 1949 [Oct. 1, 1948], No. 27358/49. Class 20(ii) [Also in Groups XIX and XXX] A detachable setting device for a twopart pit prop, for use prior to operation of the main locking device, comprises a toothed rack 13, Fig. 1 located in a casing 10 provided with lugs 11, 12 adapted to grip on the lower prop member with the head 14 of the rack pressing directly or indirectly under the head of the upper prop member, the rack 13 being driven by means of a pinion 18 which is rotated by gearing with a high transmission ration, (e.g. 1:40) by means of a ratchet 25. The head 14 may comprise a swivelly mounted head part 15 provided with a pressure mandrel 17. The ratchet shaft 23 may be arranged vertically, Fig. 1 or horizontally, Fig. 2 and the pinion 18 is keyed to a gear wheel 19 engaged by a pinion 20 co-axial with a bevel wheel 21 which meshes with a bevel wheel 22. On the shaft 23 of the bevel wheel 22, a latch wheel 24 and a ratchet 25 with a friction clutch are so fixed that the shaft 23 can be turned by a ratchet lever 26. The friction clutch consists of two plates 29, 30, Fig. 2 which are pressed together when the ratchet is actuated, by a toothed sleeve 31 screw threaded to the shaft 23. In an alternative arrangement, the pinion 18, Fig 4, is keyed to a worm wheel 33 driven by a worm 32 on the shaft 23, the ratchet mechanism being similar to that shown in Figs. 1, 2. When the ratchet lever 26 is moved in the direction indicated in Fig. 6, the sleeve 31 Figs. 4, 6 is rotated by means of a pawl 34 and is displaced axially upwards on the shaft 23 by means of the screw thread. The disc clutch is thus pressed together and the latch wheel 24 is also turned as soon as the shaft 23 is turned by the ratchet 25 on the completion of the axial displacement. The worm 32, wheel 33 and pinion 18 are thus rotated. When the ratchet is turned back, the pawl 34 slips over the teeth of the sleeve 31 whilst the shaft 23 is held fast by a pawl 35 engaging the latch wheel 24. During the next working stroke of the ratchet, the shaft 23 is again rotated. For releasing the setting device the pawl 35 is drawn back to disengage it from the latch wheel 24, whereupon the pawl 34 is turned by means of a button 36, Fig. 6 through 180 degrees whereby, on actuating the ratchet, the shaft 23 is turned back in the opposite direction. The worm 32 may be made disengagable from the worm wheel 33 by pivoting its upper bearing in the casing so that the worm can be swung away from the wheel. This enables the rack to be first adjusted by hand without actuating the gear. Alternatively the worm or bevel wheel may be made parallely displaceable or formed as an out-of-gear falling worm. The rack may be of U-section and the driving pinion divided while the worm wheel 33 or gear wheel 19 extends into the space between the arms of the U- rack.
Patent GB-936538-A (GB)
Title: Improvements in castors
Inventor: WAPSHOTT STANLEY EDWIN
IPC: B60B33/04
Filed: 1961-07-28
Abstract: 936,538. Castors. FLEXELLO CASTORS & WHEELS Ltd. June 25, 1962 [July 28, 1961], No. 27489/61. Class 52 (1). A castor has a housing of plates 1, 2, 3 swivelable about the castor swivel axis and containing a shock absorber unit consisting of two rubber half-barrel-shaped bungs 11 with an axial boring 14 and separated by a pressure plate 13 with pins 13, 13, a bar 19 joining the wheel fork members offset from a line joining the pivotal axis of the fork and wheel axis having a rubber facing 20 to engage a pressure plate 17 and apply axial pressure to the shock absorber under loading of the castor. Specification 860,352 is referred to.
Patent GB-1391345-A (GB)
Title: Error-preventing device in length-measuring instruments
IPC: F16H57/12
Filed: 1972-06-13
Abstract: 1391345 Measuring instrument Y NUMATA 13 June 1972 [30 June 1971] 27568/72 Heading G 1M In a slide calliper, movement of the slider B is indicated by a digital counter 12 actuated from a rack 1 by a gear mechanism, means being provided to eliminate backlash in the gear mechanism. The counter is driven by means of a pinion 2 mounted on a shaft 15 and meshing with the rack 1, a gear 3 mounted on the other end of the shaft 15 and meshing with a gear 5 mounted on a shaft 16 which is attached to the first counter wheel 7. The means to eliminate backlash comprises a pinion 2' meshing with rack 1 and mounted on a shaft 15', a gear 3' mounted on shaft 15' and meshing with a gear 4, a shaft 16' cantilevered on the slider B for supporting gear 4, and a helical  compression spring connected at its ends to gears 4 and 5, spring 6 being torsionally preloaded by 1/5-2 turns. Gears 3, 3', 4 and 5 may be helical gears or bevel gears.
Patent GB-449464-A (GB)
Title: Improved apparatus for heating the ends of rods, bars, tubes or the like
IPC: B21J17/00
Filed: 1934-09-26
Abstract: 449,464. Metal - heating furnaces. BEDFORD, R. A., Grange Farm, Stumperlowe, Sheffield. Sept. 26, 1934, No. 27654. [Classes 51 (i) and 51 (ii)] In a furnace for heating the ends only of metal rods, bars, or the like p, e.g. mining drills or bits, the latter project through apertures o in a renewable brick n into a narrow vertical passage i which is traversed by hot gases on their way from a combustion chamber c to the chimney j, the heating being confined to the ends by the provision of perforated pipes t which project jets of cold air on to the rods p immediately behind the brick n. The outer ends of the rods rest on a stirrup r carried by stays q which latter support the manifold s supplying the cold air pipes t. The combustion chamber c is fired by an oil burner projecting through the block x, the air for combustion being preheated in a chamber m which has a connection direct to the burner for the supply of primary air and a further connection w through which secondary air passes to tangential inlets y in the block x.
Patent GB-1096053-A (GB)
Title: Photodevelopable silver halide compositions
Inventor: SUTHERNS EDWARD ARTHUR
IPC: G03C1/49
Filed: 1963-06-21
Abstract: A silver halide dispersion is obtained by forming in an acidic aqueous medium a first silver halide consisting of silver chloride or a mixed silver halide comprising silver chloride which is more water-soluble than silver bromide, and converting said first silver halide in the presence of dissolved thiocyanate to silver bromide or a mixed silver halide comprising bromide ions which is less water-soluble than said first silver halide, e.g. silver bromoiodide, by the addition of water-soluble halide.  Conversion is preferably effected at pH 4.0, and a temperature greater than 60 DEG  C. for 10 to 120 minutes.  The silver halide grains may have a mean projective area of 0.6-2.5 square microns.  In the examples, solns of AgNO3 and NaCl were mixed, and a soln of KBr containing KCNS then added.
Patent GB-447955-A (GB)
Title: Photographic cameras
IPC: B01F11/00
Filed: 1935-10-07
Abstract: 447,955. Collapsable photographic cameras. VOIGTLANDER & SOHN AKT.- GES., 7, Campestrasse, Brunswick, Germany. Oct. 7, 1935, No. 27695. Convention date, Oct. 9, 1934. [Class 98 (i)] A self-erecting camera has a member movable within the body of the camera in the direction of the line of sight for setting the lens front slide in focusing position, the said member being always located within the camera body. The base board 3 is hinged to the camera at 2 and a slide 5, 6 guided in tracks 4, supports pivoted struts 8 which carry the lens front 10 pivotally mounted thereon at 9. A member 14 is integral with an arm 14<1> pivoted at 15 on one of the side walls of the camera, and is connected to the slide 5, 6 by links 17, jointed on to the member and slide at 16, 18 respectively, and to one of the struts 8 by a link 12 jointed at 11, 13. The joint 13 is farther from the hinge 2 than the joint 16. A coiled spring 24 anchored at a pin 26 is connected to a lug 25 projecting downwardly from the slide 5, 6. An arm 19 pivoted at 15 is integral with a toothed segment 20 which is engaged by a pinion 21. The pinion is rotated by a button 22 outside the camera. A lug 23 on the arm engages the arm 14<1> for moving the latter rearwardly against the spring 24 and moving the slide 5, 6. The rotation of the button 22 determines the position of the slide 5, 6 and the focusing of the camera. When the camera is folded, the links 12, 17 move the struts 8 round their pivots 7 to an inverted position within the camera, the lens remaining upright. Specification 388,997 is referred to.
Patent GB-1344745-A (GB)
Title: Ethylene terpolymer waxes
IPC: C08F10/00
Filed: 1972-06-14
Abstract: 1344745 Ethylene terpolymer waxes ALLIED CHEMICAL CORP 14 June 1972 [9 July 1971] 27828/72 Heading C3P Ethylene terpolymer telomer waxes containing 2 to 7 mol. per cent of acrylic acid and 0À5 to 8 mol. per cent of vinyl acetate, based on the ethylene, and having a molecular weight of 2000 to 5000 and a viscosity of 100 to 1500 cp. at 140 C., may be prepared by reacting the monomers and a telogen in the vapour phase in the presence of a free radical initiator at 140 to 200 C. and 5000 to 10,000 p.s.i. The initiator may be t-butyl peracetate, t-butyl peroctoate, di - t - butylperoxide, 1 - cyano - 1 - (t - butylazo) cyclohexane, 2 - (t - butylazo) isobutyronitrile or 2-t-butylazo-2-phenylpropane; and preferred telogens are isopropanol and acetone. The process may be effected continuously, and the products may be emulsified and used in polish formulations. In examples isopropanol telomers are prepared in the presence of t-butyl peracetate and di-t-butyl peroxide, and the products emulsified in water with ethoxylated oleyl alcohol, potassium hydroxide, ethylene glycol and diethylaminoethanol.
Patent GB-776941-A (GB)
Title: Improvements in and relating to electrical circuit breakers
Inventor: ROBBINS JAMES ARTHUR
IPC: H01H71/52
Filed: 1954-09-27
Abstract: 776,941. Automatic circuit-breakers. CHILTON AIRCRAFT CO., Ltd. Sept. 26, 1955 [Sept. 27, 1954], No. 27836/54. Class 38(5) A circuit-breaker has a pivoted flat rigid gravity-biased detent 22 which may be raised by an overload-responsive bimetal 9 or by a push rod 8 when lifted by the armature 6 of an electromagnet having overload responsive and earth-leakage coils 4, 5. The detent 22 releases a spring- biased lever 17 having an arm 16 which strikes a pin 14 on a toggle linkage 13 to cause the opening of a switch arm 11 under spring bias. A. resetting lever 19 is provided.
Patent GB-986905-A (GB)
Title: Poly-(silylphosphonates)
Inventor: BROOKS JOHN LANGSHAW
IPC: C08G77/48
Filed: 1962-07-19
Abstract: Poly - (silyl - phosphonates), characterized in that at least one P atom carries a substituent of the formula <FORM:0986905/C3/1> wherein A is an alkylene, cycloalkylene, arylene or alkylene-arylene radical X2 is a substituted or unsubstituted alkyl, cycloalkyl or aryl radical, X1 is H or X2 or X1 and X2 together form a heterocyclic ring with the N atom, may be made by reacting a halo-silane containing at least 2 halogen atoms with a compound of the formula <FORM:0986905/C3/2> wherein Z is H or a hydrocarbon radical, optionally in admixture with a compound of the formula <FORM:0986905/C3/3> wherein R3 is a hydrocarbon radical.  The reaction is affected by heating the reactants together optionally in the presence of a solvent at temperatures of from 50 DEG  to 250 DEG C.  Many examples of the reactants are given.  In a typical Example (1) dimethyldichlorosilane was reacted with diethylaminomethylphosphonic acid by refluxing under nitrogen to yield a light yellow soft wax composed of poly-(dimethylsilyldiethylaminomethylphosphonate). Uses:  as mould release agents, thickening agents, flameproofing agents and as plasticizers and stabilizers for plastics.  They are particularly useful as surfactant additives in making foamed cellular polyurethane in that they stabilize the foam during the foam-forming reaction and prevent premature collapse of the foamed material before hardening. Numerous examples of reactants for making hydroxyl-containing polyesters, polyesteramides and polyethers, and polyisocyanates are given.  In a typical Example (2) a mixture of an oxypropylated glycol (mol. wt. 3000), water, the product of Example (1). 4-dimethylaminopyridine and tolylene-2 : 4- and 2 : 6-diisocyanates, was vigorously stirred and poured into a mould; the polyurethane hardened to a flexible foam.
Patent GB-1013073-A (GB)
IPC: E21B19/24
Filed: 1964-07-07
Abstract: 1,013,073. Percussive drills. ATLAS COPCO A.B. July 7, 1964 [July 10, 1963], No. 27946/64. Heading B4C. A centralizer and device for coupling the sleeves 31 to the drills rods 29 used in a rock drill comprises a support 11 for mounting on a shell 10 of the rock drill, members 25 movable on the support between adjacent and separated positions and formed with a socket 33 adapted, when the members are in the adjacent position, to receive a sleeve, and means 41 and 35, 36 for moving the members to the adjacent and separated positions respectively. The members 25 are pivotally mounted on a housing divided into two halves 13, 14 each pivoted on the support 11, the members being provided with bosses 27 in which the-socket 33 is formed. The two halves 13, 14 are urged together by a spring 21 so that when a sleeve 31 has been moved into the socket as shown in Fig. 6, the socket grips the sleeve and by then rotating the drill the latter is unscrewed from the sleeve. A lever 35 in the form of a foot pedal, is provided for opening the members 25 against the action of springs 41, so that the sleeve may pass through. In modifications the housing for the members 25 is formed as a complete ring and the springs 41 are replaced by rubber bushings and the inner face of the socket may be provided with teeth in order to increase the grip.
Patent GB-207771-A (GB)
Title: Improvements in coil holders for wireless signalling systems
IPC: H01F27/00
Filed: 1922-08-08
Abstract: 207,771. Igranic Electric Co., Ltd., Curtis, A. H., Wright, S. R., and Mackley, A. H. Aug. 8, 1922. Inductances. - A coil-holder for wireless apparatus comprises arms 20 having recesses 31 to receive gimbals on the coils, and mounted on slides 23 secured by brackets 26 on opposite sides of a plug 27 which may be attached to a standard socket. The plug 27 consists of two wedge-shaped pieces of insulating material secured by a screw 30. The arms 20 are provided with cheeks 24 and saddles 22 and are secured on the slides by screws 25. The ends of the coil are passed through holes 33 exposed by compressing a spring 32 and are held by releasing the spring. The coils may be adjustable about their diameters in the manner described in Specification 206,899.
Patent GB-1400925-A (GB)
Title: Cylindrical switch
IPC: H01H1/36
Filed: 1973-06-13
Abstract: 1400925 Retractive switches; momentarycontact switches GENERAL SIGNAL CORP 13 June 1973 [24 July 1972] 28082/73 Heading H1N] A switch has a cylindrical housing 10 containing an axially operable spring biased plunger 11 carrying a U-shaped contact spring 12 with laterally disposed contact points 13 near its ends, a contact-supporting base 14 with a central axial opening 15, contact plates 16, 17 secured to the base 14 on opposite sides of opening 15, each having a rib extending in the opening for making contact with the contact points 13, one of the contact plates being selectively securable to the base 14 in one position or another for effecting circuit closure, in combination with the other contact plate and the contact points 13, at respectively different operating positions of the plunger 11. As shown, the housing 10 is of resilient plastics material to allow an actuator ball 22 to be inserted via a somewhat smaller opening 33. The ball 22 helps seal the switch from moisture and dirt. The fixed contacts comprise identical plates 16 and 17 shaped as shown and secured by terminal screws 24, 25 such that they may be turned to provide a normally-closed switch (as shown) or normally-open (Fig. 4C, not shown) or momentary contact (Fig. 4B, not shown), or one contact may be turned to provide a long edge for continuous engagement with one contact point 13. In a second embodiment (Figs. 5 to 9, not shown) a contact-supporting base (40) clips into a housing (41) by means of detents (42) after insertion of the ball actuator. In this embodiment one contact (49) is continuously engaged by the moving U-shaped contact, while the other has a narrow extension (52) which can be selectively inserted through one of three holes (53) to provide a normally closed, open or momentary-contact switch.
Patent GB-392166-A (GB)
Title: Improvements in or relating to appliances for use in playing miniature or indoor golf
IPC: A63B71/04
Filed: 1931-10-09
Abstract: 392,166. Golf-practising appliances. CLEAR, E. H., 61, Broadway, New York, U.S.A. Oct. 9, 1931, No. 28121. Convention date, Oct. 9, 1930. [Class 132 (ii).] A golf-hole substitute for practising putting or for use in indoor or miniature golf games consists of a cup comprising a base 60 having a relatively thin peripheral edge portion 61 and an inner portion increasing in thickness centrally, the upper surface of the edge portion merging into a thin flexible substantially frustro-conical lip 63 projecting upwardly and inwardly from the base in a gradual curve from an annular junction line a substantial distance from the periphery of the base. A groove is provided at the junction of the inner surface of the lip 63 with the base so as to facilitate the depression of the lip as the ball passes into the cup. The bottom surface of the base is slightly concave to produce a suction action for maintaining the cup in position. The Specification as open to inspection under Sect. 91 describes also a set of templets 10, 20, 30, Fig. 2 (Cancelled), for facilitating the positioning on a lawn or rug 1 of "hazard indicators " A .. D, a cup such as that described above, and one or more tees. Various positions for the cup are indicated by semicircles 34, 36 and a circle 35, on the templet 30. The tee positions are given by tabs 12, 13 on the templet 10. A set of charts is provided showing various directions in which the ball may be played around the " hazard indicators " in reaching the cup. This subject-matter does not appear in the Specification as accepted.
Patent GB-1147412-A (GB)
Title: Process of producing oxide films on substrates
Inventor: RAND MYRON JOEL
IPC: H01L21/316
Filed: 1966-06-23
Abstract: 1,147,412. Oxide films. WESTERN ELECTRIC CO. Inc. 23 June, 1966 [14 July, 1965], No. 28138/66. Heading C1A. An oxide film of at least one refractory element (Si, Al, Ti, V, Ta, Nb, Zr, Be, Th) is formed on a substrate by heating the substrate below its m.p. in an atmosphere comprising H 2 , NO and vapour of a compound (e.g. halide) of the refractory element(s). The concentration of NO may be 0À2 to 10% by volume. The substrate may be a semi-conductor material (e.g. Si or Ge) or a metal or ceramic. When SiO 2  is the desired coating, SiCl 4  or SiBr 4  may be used in amount 0À1 to 1% by volume and the substrate heated to above 700 C. after it has been placed in the said atmosphere.
Patent GB-1506599-A (GB)
Title: Check digit numbering mechanisms
IPC: B41F33/00
Filed: 1975-07-04
Abstract: 1506599 Selective printing MOORE BUSINESS FORMS Ltd 23 June 1976 [4 July 1975] 28198/75 Heading B6F Check digit numbering mechanism includes a proximity switch 12 detecting movement of a serial number printing cylinder 1 which causes via control circuit, Fig. 4, selective energization of solenoids 6 whose armatures 6a move into the path of a gear 11 connected to check digit print wheel 10 and thereby cause selection of the digit. The control circuit includes switches 15, 17, 19, 23, 24, 25 manually settable to give a "loading" to the check digit code.