baber/WOPTO huggingface dataset:
Patent GB-546830-A (GB)
Title: Automatic frequency control for wave-signal receivers
IPC: H03J7/04
Filed: 1941-02-14
Abstract: 546,830. Valve circuits for wireless reception. HAZELTINE CORPORATION. Feb. 14, 1941, No. 2051. Convention date, Dec. 30, 1939. [Class 40 (v)] In an ultra-high frequency superheterodyne receiver having automatic frequency correction the variation of the phase angle in the thermionic reactance due to variations in the effect of the transit time of the electrons when operating at differing frequencies which would tend to impair the frequency correction is compensated by a circuit which counteracts the tendency of the phase angle to vary. The Figure shows an oscillator 23 and a 'frequency control valve 22 to which a phase displaced voltage is fed from the anode of the oscillator through the phase shifting impedances 43, 44, the capacity 44 being the input capacitance of the valve 22. The oscillator is tuned by the selected inductance 26 ... 28 and the inherent capacity 29 and the anode and screen voltages applied to valves 22, 23 is varied by resistances 39 .. 41 so as to maintain a 90 degrees phase angle between the oscillator voltage and the output voltage of valve 22. In this way incidental phase shifts produced on changing the frequency are prevented by choice of resistances 39 ... 41 and 43 and take into account variation produced by the lead inductance 37 and the phase change between the anode and screen of the valve 23.
Patent GB-783859-A (GB)
Title: Improvements in implements for laterally displacing crop lying on the ground
IPC: A01D78/00
Filed: 1953-10-09
Abstract: The subject-matter of this Specification is identical with that of Specification 783,857, but the claims differ.  Specifications 783,858 and 783,860 also are referred to.
Patent GB-231972-A (GB)
Title: Improvements in or relating to thermionic amplifying circuits for telephony
IPC: H03F1/36
Filed: 1924-01-29
Abstract: 231,972. Voigt, P. G. A. H. Jan. 29, 1924. Thermionic amplifiers.-To improve the tone quality of loud speakers &c. associated with valve amplifiers, the speaker S is balanced in a Wheatstone bridge arrangement against a suitable choke coil C (or a similar loud speaker with its diaphragm fixed), and any out-of-balance currents are fed back into the grid circuit of the amplifying valve V. The bridge is completed by resistances or chokes R, and the diagonal AB of the bridge includes the primary coil of a transformer F of which the secondary coil is connected in the grid circuit in series with the input coil D. At frequencies for which the speaker S is resonant, its impedance is less than that of the choke C, and the balance is upset, resulting in a voltage being impressed on the grid circuit by the transformer F in opposition to the original input voltage. The electrical constants of the choke C may be adjusted, or it may be shunted by capacity, so as to accentuate very high and very low frequencies. A transformer T may be interposed between the speaker S and the bridge. The corrected voltages in the plate or grid circuits may be applied to further amplifiers. The transformer F mav be omitted, if the resistances R are replaced by transformer primary coils, the secondaries of which are connected in series in the grid circuit of the valve.
Patent GB-536348-A (GB)
Title: A notch-cutting machine for use in the manufacture of wooden tent pegs, tent pins and the like
IPC: B27M3/28
Filed: 1940-02-07
Abstract: 536,348. Notching machine for tent-pegs. ERCOLANI, L. B. Feb. 7, 1940, No. 2365. [Class 145 (i)] A machine for notching tent-pegs comprises a rotary table 20, the upper surface of which is provided with devices 37, 38, 39 which support the pegs in a radial arrangement with the ends to be notched overhanging the table. They are thus carried through a working position in which a rotary cutter 50 notches the underface while steadying pressure is applied to the upper side by a pneumatic-tyred wheel 71 carried by a pivoted and weighted support 68. The pegs are subsequently removed from the table by an ejector device comprising inclined members 86, 87. The cutter comprises a set of four blades 51, Figs. 10 and 11, having inclined cutting edges and mounted in close contact with a circular saw 53. The machine may include camoperated bevelling chisels for chamfering the edges of the notched part of the pegs. The table and cutter are driven by separate motors through belt and pulley mechanism. Specification 536,040 is referred to.
Patent GB-304034-A (GB)
Title: An improved domestic fire grate
IPC: F24B1/18
Filed: 1928-01-25
Abstract: 304,034. Powrie, W. L. Jan. 25, 1928. Combined or convertible fuel-burning and electric stoves; combined or convertible solidfuel and gas stores; lighting fires. - A gas or electric fire is rotatably mounted about an axis at or near its centre above a fireplace grate, so that it can be turned to face forwardly when in use, and backwardly into a recess at the back of the fire when not in use. In the form shown in Figs. 2 and 3 a member 1<A> carrying a firebrick 2, radiants 3, and a gas burner 4 is mounted by means of vertical pivots 5, 5<A> so that when the gas fire is not in use it may be turned to face back into a semi-cylindrical recess at theback of the grate, the fire-brick 2 then forming the fire-brick; the pivot 5 is hollow for the supply of gas. In a modification, the member 1<A> is rotatable about horizontal pivots, in which case, as shown in Fig. 12, the pivots 5 may be either centrally mounted on the member 1<A>, or in an eccentric position which causes the gas or electric fire when in use to occupy a position in advance. of the fireback 1. In the cases both.of vertically and horizontally pivoted fires the gas burners may be separate from the fire and fixed so that the radiants come above them when in position of use. Fig. 14 shows a further modification, in which the pivots 5, 5A of the fire are supported by toothed wheels or segments 7 rolling on horizontal racks 8, so that the fire is simultaneously inverted and moved forward from the inoperative to the operative position shown respectively in full broken lines. The coal fire may be ignited by a tubular burner 10 integral with the grate bottom, the apertures 15 of which are protected from the fuel by the overhanging edges 14 of the cap, whilst the grate bars 12, taper downwardly so that fuel will not lodge between them to impede the jets.
Patent GB-1344165-A (GB)
Title: Clutch plate
Inventor: MAUCHER P
IPC: F16D13/64
Filed: 1971-01-18
Abstract: 1344165 Mounting clutch plates LUK LAMELLEN UND KUPPLUNGSBAU GmbH 18 Jan 1971 [17 Jan 1970] 2396/71 Heading F2U A clutch plate 14 is mounted by at least two parallel-acting vibration dampers 19, 23 each with its own force storing device (springs 21, 27, 45 or 47) and its own splined hub 20, 28, 37. The hub splines 32, 33 may have different clearances with shaft splines, one hub may be non-rotatable on the shaft. The springs 21 may not all be of the same gauge wire. The spring arrangements 44 ... 47 may be replaced by leaf springs (42) Fig. 6 (not shown) cantilevered from the hub 37.
Patent GB-981985-A (GB)
Title: Improvements in or relating to air supply regulators or dampers
Inventor: BROUGHTON HAROLD
IPC: F24F13/14
Filed: 1963-01-19
Abstract: 981,985. Valves. ENGINEERS & METALWORKERS (ST. HELENS) Ltd. Jan. 15, 1964 [Jan. 19, 1963], No. 2430/63. Heading F2V. [Also in Division F4] A flanged casing 10 connectible to an air supply duct, has a spider 12 fixed thereto, the central boss 13 of which houses a rotatable rod 14 having a threaded part 15 engaged in the boss 16 of a second spider 17 which is axially movable in the casing. A sectorshaped vane 19 is pivoted to each of the three or more, four as shown, arms of the movable spider 17, each vane 19 being connected by a link 20 to a different one of the arms of the fixed spider 12 whereby rotation of rod 14 causes axial motion of spider 17 and hence pivotal movement of the vanes to more or less obturate the fluid passage through the casing. An indicator may be associated with the rod 14. The rod may be plain instead of threaded and operate the vanes by a push-pull action either directly or via a cable or linkage. The arms of the two spiders are relatively offset whilst the functions thereof may be interchanged. Rotation of the axially movable spider is prevented by guides in the casing.
Patent GB-643186-A (GB)
Title: Improvements in the assembling of well casing heads
IPC: E21B33/04
Filed: 1948-01-27
Abstract: 643,186. Wells. NAAMLOOZE VENNOOTSCHAP DE BATAAFSCHE PETROLEUM MAATSCHAPPIJ. Jan. 27, 1948, No. 2433. Convention date, Jan. 27, 1947. [Class 85] In the assembling of the sections of a well casing head, each joint is tested immediately after assembly by isolating that section of the casing head containing the joint from the tubing string and the rest of the head and introducing fluid under pressure into that section. A fall of pressure over a period of time indicates leakage at the joint which can then be rectified before proceeding further with the assembling operation. One form of isolating member has a packer which makes a fluid-tight fit with the wall. In another form, the packer can be expanded to close the bore of the apparatus and also has a second expansible packer. This two-packer isolating member is used when it is only required to test a given section of the head and it comprises a hollow mandrel 37 on the lower end of which is a shoulder stop-nut 38 against which rests one of the backing plates 96 of the lower packer 40. Sliding on the outside of the mandrel is a spacer sleeve 41 which rests on the upper plate 95 of the lower packer and supports the lower plate 45 of the upper packer 42. The packers can be expanded by rotation of a nut 39. The fluid may be pumped into each section through suitable ports provided in the casing, or it may be caused to bye-pass the upper packer by suitable passages formed in the mandrel sleeve or the upper packer. Pins may be provided on the member to enable it to be removed by a fishing tool.
Patent GB-1184419-A (GB)
Title: Method and Device for Generating and Measuring Electrostatic Charges
IPC: G01R5/28
Filed: 1969-01-15
Abstract: 1,184,419. Electrostatic generators. ALBANY FELT CO. 15 Jan., 1969 [20 Feb., 1968], No. 2440/69. Heading H2A. [Also in Division G1] A device for measuring the relative electrostatic properties of sheet materials comprises a pivoted frame 20 . . . 23 for supporting a testpiece 19 of sheet material under a predetermined tension, a weight 32 and cord 29 attached to the frame for holding the test-piece 19 in rubbing contact with a reference material 35 mounted on a wheel driven by a motor 10, and a probe 11 mounted so that it can be moved into contact with the test-piece after disengagement of the latter from the reference material, the probe being connected to a charge-measuring meter. The motor and probe are mounted on a platform 12 slidable on rods 14, 15. After charging the test-piece, the frame is swung away from the wheel and the platform is slid to the right in the figure to bring the probe into the measuring position.
Patent GB-933900-A (GB)
Title: Position control system
IPC: B23Q1/60
Filed: 1962-01-23
Abstract: 933,900. Electric correspondence control systems. SENECA FALLS MACHINE CO. Jan. 23, 1962 [Jan. 24, 1961], No. 2463/62. Class 40 (1). Apparatus for positioning a tool relative to a workpiece by means of a coarse and fine signal comprises an automatically balanced resistance bridge for each signal. As shown (Fig. 1), the tool is mounted on a vernier carriage 9 carried by a main carriage 1, the latter being driven by a drive screw 4 which also drives the slider of a potentiometer 21, and the former being driven by a drive screw 10 associated with a potentiometer 28, the potentiometer signals being individuals compared with order signals set up by knobs 17, 18. In the coarse control system (Fig. 2), the potential set up by knob 17 on potentiometer 171 is compared with that on potentiometer 21 driven by screw 4, the difference being amplified at 24 to energize servomotor 8 driving the screw 4. At balance a relay 25 is de-energized to disconnect the bridge circuit from amplifier 24, and replace it by the output from the opposing secondary windings of a transducer 15 whose core 47 is attached to a stylus 16 nesting against one of a number of stops 5, each accurately indicating one of the positions corresponding to the digital, coarse signals set up on knob 17. Thus motor 8 is now energized to drive the main carriage 1 until the carriaga 1 is located correctly relative to the selected stop 5. In the fine control system (Fig. 3) the potential set up by knob 18 on potentiometer 18<1> is similarly compared with that from driven potentiometer 28, indicating the longitudinal displacement of the vernier carriage 9 along the main carriage 1, the potential difference being amplified at 30 to energize motor 13. The circuit is biased to cause carriage 10 to approach the balance position from only one direction, thereby eliminating the effects of backlash. Specifications 686,650, 691,897 and 692,173 are referred to.
Patent GB-1572761-A (GB)
Title: Method of manufacturing animal feedstuff containing enzymes
IPC: A23K20/158
Filed: 1977-01-21
Abstract: Enzymes or enzyme-containing products are sprayed in the form of a suspension in a liquid or molten feed fat onto feed. The process is suitable in particular for the production of temperature- and moisture-sensitive feeds containing proteases. The feed to be sprayed can be in pelletised form.
Patent GB-789712-A (GB)
Title: Methods of determining the location of p or n zones in semiconductor bodies
IPC: C10K1/08
Filed: 1956-01-25
Abstract: 789,712. Electric tests. WESTERN ELECTRIC CO., Inc. Jan. 25,1956 [Feb. 4, 1955], No. 2470/56. Class 37. In order to locate the exact position of a P-N junction in a semi-conductor body, the body 1 (Fig. 1) is fed with an alternating voltage through end electrodes 2, 3 and a probe 7, connected to a battery 13, is slowly moved along the semi-conductor body while the current/voltage characteristic is continuously indicated on a cathode-ray oscilloscope 16, the effect of the bias voltage on the probe 7 being to change the C.R.O. display when the probe passes over the P-N junction. The body 1 is illuminated by a lamp 17 so that its photodiode characteristic is utilized to accentuate the in the display. To make the change in the display occur at a more precise location the bias voltage on probe 7 is augmented by pulses of opposite polarity from a further battery 20, the pulses being produced by manual operation of a switch 22. Specifications 727,678 and 748,414 are referred to.
Patent GB-461523-A (GB)
Title: Improvements in and relating to tobacco leaf stemming mechanisms
IPC: A24B5/04
Filed: 1936-01-27
Abstract: 461,523. Tobacco-stemming machines. INTERNATIONAL CIGAR MACHINERY CO. Jan. 27, 1936, No. 2479. Convention date, Nov. 5, 1935. [Class 130] In a stemming-machine in which the leaf stems are severed from the webs by adjacent stretches of a pair of travelling endless flexible cutting members or band-saws, the operative stretches of the cutting members or band-saws are held in close contact with the sides of the stem throughout the length of the leaf. The tobacco leaves are fed across a guide plate 27 to booking drums 35 and the stems, which are supported by a rotating roller 71, are cut out of the leaves by a pair of band-saws 57, the cutting edges of which are flared away from each other to guide the stem between them. To enable the saws to cut the webs at the juncture with the stems despite variations in the diameter of the stem, one band-saw 57 is resiliently urged towards the other by a spring- pressed pulley 63 which can be retracted by a treadle 66 to facilitate the insertion of the stem between the saws. Each leaf is fed by hand until the webs are engaged between the booking drums 35 and the belts 34. To permit the leaf books B to be removed from the drums, handles 21, 33 swing away from the drum the arms 22, 26 over which the belts 34 pass.
Patent GB-980771-A (GB)
Title: An impregnating epoxy resin
IPC: C08G59/42
Filed: 1961-01-20
Abstract: Epichlorohydrin, 2,2 - bis(4 - hydroxy - 3,5 - dibromophenyl)-propane, and a methanol solution of sodium hydroxide were heated together at 65 DEG  C., salt was filtered off and the filtrate stripped by distillation to yield brominated polyglycidyl ether with a Durran's softening point of 45-50 DEG  C., oxirane oxygen content of 4.4% and epoxide equivalent of 364.ALSO:A polyglycidyl ether of a polynuclear phenol, having a plurality of bromine or chlorine atoms attached to nuclear carbon atoms, and being free from groups reacting with an acid anhydride other than hydroxyl and epoxy groups, is brought to the form of a stable liquid having a viscosity of less than 80,000 cps. at room temperature by admixture with a polycarboxylic acid anhydride which has a melting point not greater than 40 DEG  C.  The composition can be cured to a flame retardant state in the presence of sufficient polycarboxylic acid anhydride to yield 0.5-2 anhydride groups per epoxy group and of a catalyst for epoxyanhydride reactions.  The composition may also include liquid non-halogenated epoxy resins, e.g. EPON 828 or Epiphen 849.  The brominated epoxy resin specified is prepared from brominated bisphenol, e.g. 2,2,bis-(4 - hydroxy - 3,5 - dibromophenyl)propane, and epichlorohydrin. Anhydrides specified are Dills-Alder adducts of maleic anhydride, e.g. methyl endomethylene tetrahydrophthalic anhydride; an adduct of maleic anhydride and myrcene; or tetrapropenyl succinic anhydride prepared from maleic anhydride and the tetramer of propylene.  Suitable catalysts for the curing reaction are basic tertiary amines, e.g. dimethylbenzyl amine and salts thereof, or Lewis acids, e.g. boron trifluoride or stannic chloride.  Fillers, thixotropic agents, pigments, flexibilizing co-reactants or reaction diluents may be included in the curable compositions.  In examples (1) a stable liquid mixture of the brominated polyglycidyl ether referred to above and methyl-endomethylenetetrahydrophthalic anhydride was prepared. With addition of tris - (2,4,6 - dimethylaminomethyl)-phenol it could be cured in 3 hours at 120 DEG  C. If desired the composition before curing could include 35% talc and 5% antimony trioxide. (2) Myrcene-maleic anhydride is used to liquefy the brominated glycidyl ether, and methyl-endomethylene-tetrahydrophthalic anhydride and tris - (2,4,6 - dimethylaminomethyl)phenol were added to make a curable mixture. The curable composition may include talc and antimony trioxide.  (3) The brominated polyglycidyl ether was liquefied with myrcene-maleic anhydride adduct, and the mixture cured with an acid-terminated polyester prepared from maleic anhydride and polypropylene glycol with tris-(2,4,6-dimethylaminomethyl) phenol as catalyst.  The curable composition may include talc and antimony trioxide.  (4) The compositions of Example (3) were modified by inclusion of some EPON 828-a conventional epoxy resin.  The compositions are useful as casting resins, wire insulation, or impregnants for glass cloth.
Patent GB-450105-A (GB)
Title: Improvements in or relating to the reduction of material to a fine state of subdivision by attrition
IPC: B02C21/00
Filed: 1935-01-25
Abstract: <PICT:0450105/III/1> In the method of producing partially oxidized lead powder by abrading lead in an oxidizing zone and removing and separating the powder, the oversize particles are returned automatically to the zone for further treatment.  As shown, the drum 19 revolves in a stationary casing 13 connected by ducts 14 to an air sifter.  Each end of the drum is provided with a grating 30 and a spiral conveyer 37.  Metallic lead is fed through a hollow trunnion 21 to a central feed pipe 24 provided with opposed feed screws 26 which discharge the lead through a central opening 25<a>.  A sieve 33 and perforated plate 35 form a chamber around the grating 30, the fine material falling into hoppers 34 whilst the coarse material is returned to the feed pipe 24 by the conveyers 37.  The screens 33 may be tapped by beaters.  The lead is oxidized by friction or heated air.
Patent GB-168818-A (GB)
Title: Improvements in temporary binders or loose leaf books
IPC: B42F13/04
Filed: 1921-01-19
Abstract: 168,818. Watt, R. J., and Spicer, J. L. Jan. 19, 1921. Flexible band files; clamping - devices ; covers. - In loose-leaf binders of the kind in which a screw rod is located in a hollow cover and acts upon a cross-bar carrying straps which pass through the cover and clamping-bars, the straps being attached to the other cover and acting as hinges, slotted U-shaped connecting-pieces 4 project from the covers 6, 7, the edges of the slots 5 being rounded off for the free passage of the straps 3 through the leaves and clamping-bars 1, which are provided near the centre with slots 2, the arrangement permitting the binder to open out perfectly flat. The length of the projecting-pieces from the covers is equal to the distance of the slots 2 from the edges of the clamping-bars, so that. the rear edges of the covers abut the inner portions of the clamping-bars in the closed position of the binder and the outer portions in the open position. The cross-bar 8 is provided with holes through which pass rods 9 secured in the cover frame-work, the rods acting as guides and ensuring both straps being tensioned alike. The end of the screw rod 10 is tapered, and the key is formed with dents 13 so that the key will jump on the rod when any tendency to overwind the straps occurs. The end of the rod may be round or coned, and the key slit to give the friction grip. According to the Provisional Specification, the straps may be constructed from green vellum scraped clean amd cemented to webbing.