baber/WOPTO huggingface dataset:
Patent GB-1169120-A (GB)
Title: Controlled Rectifier Trigger Circuit
IPC: H02M1/08
Filed: 1967-06-06
Abstract: 1,169,120. Thyristor control circuits; control of A.C. motors. GENERAL EQUIPMENT & MFG. CO. 6 June, 1967 [6 June, 1966], No. 25948/67. Headings H2F and H2J. [Also in Division H3] A controlled rectifier in an alternating current circuit such as the windings of an induction motor, is triggered by means of two energy storage devices which are charged while the anode of the rectifier is negative and discharged into the trigger electrode to provide a high initial trigger current, the discharge path for one including a current limiting resistor so that together with current supplementing means operative when the anode is positive it provides a lower maintaining current. An A.C. supply at 37, Fig. 2, in phase with the supply to the anode of a thyristor 16 charges a capacitor 38 through diode 44. On the positive going portion of the negative half cycle diode 44 cuts off and capacitor 42 is charged via resistor 40. During the positive part of half cycle a thyristor 46 is triggered so that capacitor 42 discharges rapidly into the gate circuit of thyristor 16, the current being maintained at a smaller value by discharge of capacitor 38 through resistor 40 and thereafter by current through diode 43 and resistor 40. Reliable triggering is thus obtained when the load is inductive and anode voltage build-up is slow. The invention may be incorporated in a speed control system for an induction motor, one of the control circuits shown in Fig. 2, being provided in each of the three phase leads and each thyristor 16 being reversely shunted by a rectifier (Fig. 1, not shown). The triggering pulses for the thyristors 46 are provided by the circuits shown in Fig. 3. At the start of each positive half cycle a timing capacitor 68 is rapidly charged from a point X via diode 76 to an initial value and thereafter charges progressively through a resistor 67 from a circuit comprising a capacitor 61 which is charged during the negative half cycle through diode 62, the voltage during the positive half cycles being limited by a Zener diode 64. The charging continues until a uni-junction transsistor 70 fires and produces via transformer 49 a firing pulse for thyristor 46. Capacitor 75 is discharged during the negative half cycle through rectifier 75. Resistor 78 enables the initial charge on the timing capacitor to be adjusted, thus to equalize the timings of the three phases and to control the maximum speed of the motor. Similarly resistor 67 can be adjusted to equalize the operation of the three phases and the minimum speed of the motor.
Patent GB-1475952-A (GB)
Title: Smoke detector and alarm circuit arrangement
IPC: G08B17/107
Filed: 1975-06-18
Abstract: 1475952 Smoke detector and alarm circuit J L FRANKS 18 June 1975 [24 June 1974 19 May 1975] 26002/75 Heading G1A This comprises an alarm 15 activated by solid state switch Q 1  controlled by solid state trigger means Q 2  responsive to the conductivity difference of photocells PC 1  and PC 2  due to light from L.E.D. D 3  illuminating PC 2  directly and PC 1  by reflection from smoke. Neon 25 indicates as soon as the circuit is energized. Positive halfwave pulses are provided by diode D 1  and limited by resistors R 8 , R 9  so that D 3  emits at power line frequency. Voltage divider R 8 , R 9  supplies photo-conductor PC 2  with 20V. Photo-conductor PC 1  and resistor R 6  form a voltage divider supplied by PC 2  and R 7 . When light from smoke strikes PC 1 , its conductivity increases and the voltage at node I drops in proportion, and when it is less than at node 3 programmable uni-junction transistor Q 2  will latch on and stay on for the duration of the halfwave peak. When gate 42 of silicon controlled rectifier Q 1  is thus forward biased, it conducts so that Horn 15  sounds, whereas normally the horn current is only that to neon 25 limited to several orders less by resistor R 1 . Resistor R 2  and capacitor C 1  protect Q 1  from transients from the power line. If D 3  fails, the conductivity of PC2 increases, node 1 voltage drops and the horn sounds as above. PC 1  and PC 2  have the same temperature coefficient with resulting temperature compensation. Similarly they compensate for variation of L.E.D. output. PC 2  could be inserted in the position of R 5  with the appropriate component value changes. In the embodiment of Fig. 3 (not shown) the emitter of a transistor (Q 13 ) is connected to the photo-conductor (PC 12 ), which receives light directly from the GaAsP L.E.D., and its collector to the smoke sensing photo-conductor (PC 1  1 ) and the base to the slider of a potentiometer (R 15 ), which is a smoke calibration control. (Q 13 , PC 12 , R 15 ) and a resistor (R 16 ) form an adjustable continuous current source. A by-pass capacitor prevents high frequency line noise reaching the detector.
Patent GB-1179858-A (GB)
Title: Method and Apparatus for Treating Textile Material
IPC: D06C7/02
Filed: 1967-06-06
Abstract: 1,179,858. Treating a length of knitted or woven material. INSTITUT TEXTILE DE FRANCE. 6 June, 1967 [10 June, 1966], No. 26026/67. Heading D1L. Continuous length knitted or woven material is impregnated with water before or during stress relieving treatment in which the material is subjected to the action of steam or hot air simultaneously with the formation of the material into folds along a generally upwardly inclined path and subjection of the material to vibration. The stress relieving treatment equipment consists of an inclined vibrating conveyor belt having a feed cylinder 7 rotating at the same speed as the end rollers 5, 6 of the conveyor together with an endless retainer belt 8 which is more steeply inclined than belt 4. Both belts are enclosed in a chamber through which steam or hot air is passed. The impregnation of the material with water may be effected by atomisers 3, or by rollers which themselves are immersed in a bath, or by passing the material itself through a bath with subsequent centrifuging and partial drying. An anionic or cationic wetting agent is preferably added to the water.
Patent GB-1244829-A (GB)
Title: Improvements in or relating to phonograph cartridge mounting platforms
IPC: F16B21/07
Filed: 1970-05-29
Abstract: 1,244,829. Pick-up cartridge mounts. PICKERING & CO., Inc. 29 May, 1970 [13 Aug., 1969], No. 26052/70. Heading G5R. Pick-up cartridge 12, which is normally mounted on a tone arm by screws passing through slots 28 in mounting bracket 26 to tapped holes in the arm, is more simply mounted by the interposition of a platform 10 of e.g. nylon material between cartridge and arm. The platform is formed with resilient walls 36, between which bracket 26 snap fits, and upwardly directed spring lugs 46, 48 which are split to allow a compressed fit in the tone arm screw holes.
Patent GB-518935-A (GB)
Title: Process for the improvement of the electrical properties of solutions
IPC: C25D3/02
Filed: 1938-09-08
Abstract: 518,935. Electroplating. BECK, R.. Sept. 8, 1938, Nos. 26255 and 26256. Convention dates, Nov. 3, 1937, and Aug. 26, 1938. [Class 41] Dilute solutions of organic or inorganic substances prepared by graduated dilution in three or more stages with an interval of rest between the stages are added in small quantities to electrolytic baths used for the deposition of metals, and improve the baths as regards conductivity, current consumption, yield &c. and the deposited metal as regards adhesion ductility, reflective power, resistance to corrosion &c. In examples, solutions prepared by graduated dilution of shave grass solution, sodium hydroxide or common salt are added to a nickelplating bath, antimony sulphate to a zinc-plating bath, benzoic acid to a chromium-plating bath, water-glass, extract of birch containing saccharin and boric acid, or solution in alcohol of nickel carbonate to a copper-plating bath, mercuric potassium cyanide to a silver-plating bath, extract of ox kidneys to a tin-plating bath, solution in alcohol of' copper carbonate to a lead-plating bath and an extract of fresh ash tree shoots containing saccharin and boric acid to a gold-plating bath.
Patent GB-717426-A (GB)
Title: Improvements in or relating to perfluorocarbon bromides
IPC: C07C17/093
Filed: 1951-11-09
Abstract: Perfluorocarbon bromides are made by reacting bromine at temperatures substantially above atmospheric temperatures with a perfluorocarbon carboxylic acid or an anhydride thereof.  The reaction with the anhydride also gives a perfluorocarbon carboxylic acid bromide which, however, is decomposed on heating to the bromide.  Temperatures of 150 DEG  to 600 DEG  or 650 DEG  C. are mentioned.  At least about an equal molar proportion of bromine is used and generally bromine is in excess.  Catalysts may be present.  In examples: trifluoroacetic acid yields trifluoromethyl bromide in the presence of (1) active carbon, and (2) non-catalytically and with active carbon which may be mixed with p  silver, zinc, or aluminium bromides, in (3) pentafluoropropionic, (4) perfluorobutyric, (5) perfluorocaprylic and (6) perfluorocyclohexane-carboxylic acids yield pentafluoroethyl, n-heptafluoropropyl, n-perfluoroheptyl and perfluorocyclohexyl bromide respectively in the presence of active carbon and in (7) perfluoroacetic and (8) perfluorobutyric anhydrides yield trifluoromethyl bromide and n-heptafluoropropyl bromide respectively in the presence of active carbon the corresponding acid bromide additionally produced in (7) being subsequently heated to yield further quantities of the bromide.  Dicarboxylic acids, e.g. perfluorosuccinic, perfluoroadipic and perfluorocyclohexane-1,3-dicarboxylic acids, and anhydrides, e.g. perfluorosuccinic acid anhydride may also be used.  Pressure may be applied to effect a liquid phase reaction.
Patent GB-171557-A (GB)
Title: Improvements in clamping screws for use on machine tools and the like
IPC: B23B29/04
Filed: 1920-09-15
Abstract: 171,557. Archer, B. B. Sept. 15, 1920. Set-screws.-A screw A for clamping tools in toolholders has its end recessed to accommodate a loose projecting piece C of case-hardened steel. The piece C is a rod of uniform diameter fitting friction tight in the recess and projects slightly less than its diameter from the screw.
Patent GB-1015760-A (GB)
Title: Resilient shaped member with metallic-lustre or high-lustre surface, more particularly for use in motor vehicles
IPC: B60N2/75
Filed: 1963-07-04
Abstract: 1,015,760. Ornamenting. A. HUECK & W. ROPKE. July 4, 1963 [July 4, 1962; July 7, 1962; Aug. 7, 1962], No. 26544/63. Heading B6G. [Also in Divisions A4 and B7] A shaped member, e.g. a vehicle arm-rest, a sun-shield, a grip handle, a panel lining or a headlight weather gasket, is made of foamed synthetic plastic, e.g. cold-foaming polyurethane, covered wholly or in part with a synthetic plastic skin backed with a reflecting layer. The skin is deep drawn to shape before or after coating with the reflecting layer, depending on whether a low- or a high-lustre finish is desired. The skin is translucent and may be coloured. The skin may be double with each lamination having a reflecting layer, the reflecting layers being face to face. In a sunshield, the other surface may be ribbed or grained to prevent glare. As shown in Fig. 3, a padded grip handle has a polyurethane body 2 foamed about a reinforcing layer 3 and having its upper part covered with inner and outer skins 6, 9 having reflecting layers 7, 8 on the facing surfaces. As shown in Fig. 6, a headlight base having a peripheral weather seal consists of a body of polyurethane foam, the edge rim 12 of which has adhesively secured thereto an outer skin 21 backed by a reflecting layer 20 and a protecting layer 23.
Patent GB-421462-A (GB)
Title: Improvements in electric incandescent lamps
IPC: H01K1/46
Filed: 1934-09-17
Abstract: 421,462. Electric incandescent lamps. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London.-(Assignees of Patent-Treuhand - Ges. f³r Elektrische Gliihlampen; 11, Ehrenbergstrasse, Berlin) Sept. 17, 1934, No. 26665. Convention date, Sept. 19, 1933. [Class 39 (ii)] Caps ; sealing leading-in wires.-In an electric incandescent lamp for use more particularly with an alkaline storage battery, the base plate of the cap is provided with a contact face 8 and an extension or portion 9 in which one leading-in wire 2 is secured by cadmium solder 12, the aperture within which the end of the wire is soldered being remote from the contact face 8. The other leading-in wire 3 is soldered within a hole in a lug 13 formed on the metal sleeve 6, cadmium preferably being used in making this joint also. The insulating body 7 of the cap is formed with a funnel-shaped cavity 11 for the passage of the leading-in wire 2.
Patent GB-309816-A (GB)
Title: Improvements in apparatus for feeding paper sheets
IPC: B65H9/06
Filed: 1928-09-18
Abstract: 309,816. Phillip, F. von, and Phillip, H. von. Sept. 18, 1928. Sheet-separators ; pile supports.-In apparatus for feeding sheets from a fanned-out pile, the suction separator is constructed as a suction rod 3 which is reciprocated horizontally only, in fixed horizontal slots 2a, and the front of the pile is reciprocated vertically so as to bring the top sheet into contact with the rod 3 by means of a pivoted plate 20. The plate 20 is oscillated by a cam e acting on a roller f on a rod c formed with a, slot d embracing the shaft 7 of the cam e.
Patent GB-657906-A (GB)
Title: Monitor for analyzing frequency shifted waves
IPC: H04L27/14
Filed: 1948-10-14
Abstract: 657,906. Electric tests. RADIO CORPORATION OF AMERICA. Oct. 14, 1948, No. 6760. Convention date, Oct. 31, 1947. [Class 37] [Also in Groups XL (b) and XL (c)] In a monitor for frequency shifted waves including a tuning indicator M2 and a frequency shift meter M5, part of the output of the discriminator L7, C21, L6, C18 and V3 is fed via potentiometer R18, R19 to a cathode follower V4A. The square wave output V4A is fed over conductor 42 to the grids of double triode V8, the right-hand half of which provides deflecting potentials for an oscilloscope. The left-hand section of V8 is connected as a cathode follower feeding the left-hand section of V9, which is arranged so. that the average grid voltage depends only on the percentage mark of the signal. Meter M3, adjusted by R46, in the cathode lead of V9 (L.H.) is calibrated to read percentage mark directly. The grid-to-cathode section of V9 (L.H.) and rectifier 78 act as a peak-to-peak rectifier, so that meter M4 indicates the peak-to-peak value of the signal appearing across the cathode load R41 of V8 (L.H.). Potentiometer R18 is adjusted so that the peak-to-peak level, as shown by meter M4, of the signal applied to the tuning indicator circuit and the mark/space ratio meter circuit is maintained at a predetermined level.
Patent GB-401296-A (GB)
Title: Improvements in or relating to thermionic valves
IPC: H01J21/02
Filed: 1932-05-02
Abstract: 401,296. Thermionic valves. WARREN, S. F., 27, Lowick Road, Harrow, Middlesex. May 2, 1932, No. 26876/33. Divided on 401,305. [Class 39 (i).] A valve has a cathode 2 surrounded by a control grid 3, a screen grid 5, a suppressor grid 13, an anode 4 and an external screening electrode 6 which is connected with the suppressor grid 13. The electrode 6 is of grid form and connected with a point of low potential such as the cathode, or with the control grid, or earthed. The suppressor grid 13 has a wide mesh. An annular metal screen 12, connecting the electrodes 6, 13 is provided at one or both ends. Specification 401,305 is referred to.
Patent GB-662035-A (GB)
Title: An improved seconds' mechanism for a watch movement
IPC: G04B13/00
Filed: 1949-10-19
Abstract: 662,035. Watches. EBAUCHES SOC. ANON. Oct. 19, 1949 [July 1, 1949], No. 26887/49. Class 139 A seconds mechanism for a watch movement comprises two co-axial wheels 15, 16, Figs. 2, 3, one driving (15) and the other driven (16), these two wheels being connected with one another by a spring 7 and having the same number of teeth, and an arresting member co-operating with these two wheels in such a way that on passage of each tooth of the driving wheel 15 the arresting member will be displaced by an amount sufficient to afford passage to the driven wheel 16 which is then actuated by the spring 7. The diameter of the driven wheel 16 is greater than that of the driving wheel and the arresting member is constituted by a double pawl 17, 17b, one arm 17b of which co-operates with the driving wheel and the other arm 17 with the driven wheel 16. A pin 12 on the wheel 15 cooperates with the spokes of the wheel 16 to determine the relative initial positions of the wheels 15, 16. The arrangement is such that with the wheel 15 " beating " fifths of a second the wheel 16 " beats " full seconds and is connected through the gears 3 and 2 to the seconds hand.
Patent GB-920097-A (GB)
Title: Improvements in or relating to temperature measuring or temperature responsive apparatus
IPC: G01K7/34
Filed: 1960-08-03
Abstract: 920,097. Measuring electrically. WAYNE KERR LABORATORIES Ltd., and R. CALVERT. July 28, 1961 [Aug. 3, 1960], No. 26936/60. Class 40 (1). Temperature measuring or temperature responsive apparatus comprises an electrically conductive expansible liquid in a non conductive tubular container, said liquid forming one electrode of a capacitive arrangement of which a second electrode is disposed outside said container adjacent a part thereof, a conductive screen extending axially in both directions beyond the second electrode, means for applying a reference A.C. voltage between one of the electrodes and the screen, a current responsive device to which is fed the current between the other electrode and the screen resulting therefrom, and a balancing circuit arranged to feed a balancing current to the current responsive device in opposition to the said resulting current so that the current responsive device presents a low impedance to said resulting current. As shown, Fig. 1, mercury in a tube 10 of glass or quartz forms a first electrode; a second electrode 12 around the tube 10 may be axially movable. Electrode 12 and a screen 15 are embedded in a resin casting 16 and are connected to the inner and outer conductors respectively of a coaxial cable 14. A.C. is applied between the screen and the mercury; as shown, the mercury is capacitively coupled to an earthed electrode 17; alternatively a direct connection between mercury and electrode 17 may pass through the container. The device may be calibrated in the same way as an ordinary mercury thermometer. In the measuring circuit of Fig. 2 the output of a secondary half-winding 23 of an input transformer 25 is supplied between electrode 17 and screen 15, electrode 12 and screen 15 being connected to the primary winding 20 of a transformer 21 whose secondary 31 is connected to a detector 32 with a null balance indicator 33. The primary 20 is also fed via an adjustable capacitor 28 with the output of a second secondary half-winding 24 of transformer 25, a null output from transformer 21 being obtained by adjustment of variable capacitor 28 or a tap 29 on primary 20. To prevent the mercury sticking to the tube the latter may be vibrated as by a moving-coil vibrator 60. In a modification, Fig. 3, the output from electrode 12 and screen 15 is fed to a high-gain amplifier 40 having a negative feed-back circuit 41, the output voltage of the amplifier 40 being measured by a meter 46; this output may also be used to control the temperature of a body as through a servo-system. The input to the amplifier may be partially balanced by a signal of known magnitude derived from a secondary half-winding 49 of the input transformer feeding a standard impedance 50. If visual access to the mercury is required electrode 12 and screen 15 have aligned axial slits, or are made of transparent material, e.g. conductive glass.
Patent GB-1053638-A (GB)
Title: Halogenated polyphenylene ethers
Inventor: STAMATOFF, GELU STOEFF
IPC: C08G65/38
Filed: 1964-07-01
Abstract: 1,053,638. Polyphenylene ethers. E. I. DU PONT DE NEMOURS & CO. July 1, 1964, No. 27149/64. Heading C3R. Polyphenylene ethers containing units of formula where R is a chlorine, bromine or iodine atom, are obtained by polymerizing under anhydrous conditions a compound having ions of formula where X is chlorine, bromine or iodine, in the presence of a solvent for the polyphenylene ether and an initiator consisting of an inorganic perocyacid salt, an organic acid peroxide, a hypochlorite or hypobromite or an inorganic periodate. In examples polymers are obtained from a phenolate derived from sodium hydroxide and 2,6-dichloro-4-bromophenol using benzoyl peroxide, tert. butyl hypochlorite and lauroyl peroxide as initiators.
Patent GB-311630-A (GB)
Title: Method of and apparatus for tapping oils and fats in measured quantities from a tank
IPC: B67D7/60
Filed: 1928-09-21
Abstract: 311,630. Huber, P. Sept. 21, 1928. Fixed-chamber apparatus.-Oils or fats from a tank 1 are fed to and delivered from a measuring chamber 6 by means of compressed air. A pump 3 delivers compressed air by a pipe 5 into the top of the tank 1 from which the liquid is forced through the float-controlled valve 25 and pipe 7 into the chamber 6. When the piston 8 has completed its stroke, the valves 13, 15 are rotated through a right angle by means of the lever 18. The pipe 7 is thus cut off and the valve 15 now provides a communication between the chamber 6 and discharge pipe 16. At the same time the valve 13 allows compressed air to pass through the pipe 14 from the top of the tank 1 to the space above the piston 8. The stroke of the piston may be adjusted for varying the amount delivered by enclosing the piston rod 9 within a tube 10, Fig. 4; the tube may be turned by an external calibrated disc 12 to bring any one of a number of grooves 40 of differing length into alignment with a projection 41 from the rod. At their lower ends the grooves 40 terminate in a transverse groove by which the turning adjustment is permitted but is restricted to the occasions on which the piston and its rod are in their lowermost positions. The passage of air into pipe 7 is prevented by the float-controlled valve 25. Dripping from, the tap 26 is prevented by the fitting of an adjustable spring-pressed valve. One pair of valves 13, 15 may be used with two cylinders working alternately.
Patent GB-336069-A (GB)
Title: Improvements in sterilizing cases for hypodermic syringes and other small clinical instruments
IPC: A61L2/26
Filed: 1929-09-09
Abstract: 336,069. Goldstein, A. A. Sept. 9, 1929, Disinfecting. - A sterilizing case for a hypodermic syringe or other small clinical instrument comprises a tube 1 closed at one end by a screw cap 7 and at the other by a reservoir 6. An inner tube 9 sliding in a reduced portion 10 of the bore of the tube. 1 is normally pressed upwards by a spring 12 and is formed at its top with a seating to engage a bevelled portion 16 of a syringe 17, and at its lower end with a flange 13 to engages a valve seat 3 at the base of the tube 1. The flange 13 is preferably formed on a threaded cap 14. The tube 9 is formed with holes 15 above the cap 14. When the syringe is in place and the case closed, as in Fig. 2, sterilizing liquid enters the tube 9 and surrounds the needle and lower part of the syringe but cannot escape into the upper part of the case. On withdrawing the syringe the tube 9 is forced upwards by the spring 12, as in Fig. 3, so that the flange 13 closes the liquid reservoir 6. The liquid remaining in the hollow cap 14 is used for cleansing the skin prior to insertion of the needle.