baber/WOPTO huggingface dataset:
Patent GB-493477-A (GB)
Title: Improvements in fidelity control of radio receiving sets
IPC: B65D3/22
Filed: 1937-08-10
Abstract: 493,477. Wireless receiving circuits. HAZELTINE CORPORATION. Aug. 10, 1937, No. 21995. Convention date, Aug. 13, 1936. [Class 40 (v)] The fidelity of reproduction of a wireless receiver is automatically controlled by varying the transmission efficiency of a modulated-carrier amplifier stage inversely or directly in accordance with the instantaneous amplitude of the modulation-frequency envelope of a desired signal. In the arrangement shown, part of the output of the first I.F. amplifier 14 of a superheterodyne receiver is applied to an A.V.C. rectifier 23, the load circuit of which comprises two resistances 24, 25 in series, the common point being earthed. The A.V.C. voltages across 24 are applied both to the preceding stages 12, 13, 14 and to the subsequent stage 15, whereby a flat A.V.C. characteristic is obtained. Due to the high selectivity of the I.F. circuits, the fidelity is poor, the outer sideband frequencies being attenuated with respect to the middle sideband frequencies. Part of the demodulated signal voltage across the load resistance 20 of the audio-frequency rectifier 19 is fed over condenser 32 to a repeater 31 and thence over a phase shift network 30 to the second control grid of the radio-frequency amplifier 12. The repeater 31 is normally biassed to cut-off by battery 33 which bias is opposed by the voltage drop across resistance 25 ; the valve is thus inoperative at signal strengths below a certain value ; and its gain, when operative, is directly increased with increasing signal strength. The audio-frequency voltages fed back from resistance 20 are applied to the amplifier 12 in reverse phase to the audiofrequency components of the carrier frequency applied from the system 10 ; the phase reversal occurs over the valve 31, the phase-shift network 30 merely compensating for the phase-shift through the receiver. Thus this system contemplates correction of distortion due to sharp tuning by feeding back the audiofrequencies in reverse phase over a repeater the transmission efficiency or gain of which varies directly with signal strength ; the result is an apparent broadening of the selectivity on strong signals without actually varying the selectivity of the receiver circuits. If the A.V.C. system has a rising characteristic, such that the input to the signal detector increases with increasing signal strength, the repeater 31 may be dispensed with. Alternatively the network 30 may be designed to discriminate against the middle sideband frequencies in favour of the outer frequencies, the control voltage being then applied to valve 12 in phase with the modulation frequency envelope of the signal input ; or a filter network having such discriminatory characteristic may be added to the network 30 in the feed-back path. The feed-back voltage may be applied to more than one radio-frequency stage or to one or more I.F. stages.
Patent GB-138045-A (GB)
Title: A filtering device for liquid fuel supply tanks
IPC: B01D35/02
Filed: 1919-09-08
Abstract: 138,045. Bennett, A. G. Dampier-. Sept. 8, 1919. Bag filters. - A filtering - device adapted to be fitted into the filling-orifice of a liquid-fuel tank comprises a cylindrical bag 1 made of silk &c., the mouth of which is secured round a flanged ring 3, which is supported in the filling-orifice by a wire handle 4, the ends of which project into grooves 8 in the sides of the orifice. The handle 4 normally hangs down, allowing a cap to be screwed on over the orifice, or the orifice may be threaded internally and closed by a screw plug.
Patent GB-701776-A (GB)
Title: Improvements in or relating to lampshades
IPC: F21V1/00
Filed: 1952-09-02
Abstract: 701,776. Lampshades. JARVIS, G. R. Dec. 19, 1952 [Sept. 2, 1952], No. 22069/52. Drawings to Specification. Class 75 (2) A method of making a lampshade consists in winding a strip of flexible material over a frame having top and bottom rings, the strip passing first over one ring then over the other ring, and so forth, and the winding progressing helically around the frame. The ends of the strip are joined to each other or anchored to the frame. The strip may be folded about a longitudinal line before winding on the frame, the inturned part being much narrower that the remaining part, and in the winding operation the fold of each convolution is disposed towards the previous convolution. The top and bottom rings of the frame are held spaced apart by connecting wires and are circular, triangular, square, rectangular or polygonal or of tortuous shape. In the Provisional Specification it is stated that if two or more strips are used they can be wound on simultaneously while held in overlapping relationship and that strips of different colour or patterned strips may be used.
Patent GB-389473-A (GB)
Title: Improvements in and relating to the production of fertilising materials
IPC: C05D9/00
Filed: 1931-08-04
Abstract: Fertilizers are prepared by mixing fertilizing substances, wholly or in part dissolved, with adsorptive clay, loess or kaolin, active aluminium or iron hydroxide, active silica, or similar inorganic adsorptive substances, the resulting mixture being converted into a strewable condition by drying. Specifications 11911/99, [Class 111, Sewage &c.], and 389,111 are referred to.  The Specification as open to inspection under Sect. 91 states that inorganic absorptive substances may be used instead of the adsorptive substances.  This subject-matter does not appear in the Specification as accepted.
Patent GB-466455-A (GB)
Title: Improved cutter for and method of cutting gears
IPC: B23F21/22
Filed: 1936-08-11
Abstract: 466,455. Gear - cutting. - GLEASON WORKS. Aug. 11, 1936, No. 22123. Convention date, June 2. [Class 83 (iii)] A gear - cutting tool, particularly a facemilling cutter for cutting, bevel and hypoid gears has a different effective pressure angle adjacent its tip than along the rest of its height. Thus the tool 41, Fig. 2, for cutting a pinion 40 has a pressure angle a from the bottom to the point 43 and a smaller pressure angle a<1> from the point 43 to the tip. The dedendum portions 46 are thus cut to the full line profile instead of to the standard profile shown in dotted lines, the full line profile being set back below a point 50 so that there is no contact of the tips of the gear teeth and the part of the pinion teeth below the point 50 when the gear and pinion are running in mesh, as shown in Fig. 3. In a face-mill tool, Fig. 5, the cutting blades 66 all have outside cutting edges 67 which are formed with hook 68 extending from the point 43 of Fig. 2, the effect of this hook combined with the relieving of the top face 70 of the blade, being to provide the smaller pressure angle required as shown in Fig. 6, whereon 75 shows a line in the top blade surface lying in the plane 67 and 73 shows the outer top edge of the blade. Instead of using hooked blades the cutter may be composed partly of blades 80 having standard cutting edges 81 and partly of blades having edges 83, of the smaller pressure angle a<1>, the edges in projection crossing at point 85, Fig. 8, corresponding to point 43. In another modification, Fig. 10, the blade has edges with the two pressure angles joining along a line 94. The gears are generated from such tools by the usual rolling movements. Preferably only the pinion of a pair of gears is cut by the above method but in some cases both gear and pinion may be so cut or if the pinion is to drive always in the same direction only one side of the pinion teeth may have the modified profile. The invention is also applicable to cutting other forms of gears either bevel or spur and the tools may be reciprocating tools or grinding wheels.
Patent GB-1351996-A (GB)
Title: Method and device for routing gas through heat exchangers
IPC: C01C1/04
Filed: 1971-04-19
Abstract: 1351996 Tubular heat exchangers; steam generators FRIEDRICH UHDE GmbH 19 April 1971 [19 Feb 1970] 22126/71 Headings F4S and F4A A shell and tube heat exchanger, particularly for cooling hot recycle gas from an ammonia synthesis reactor, comprises a header chamber 7 subdivided by a partition 3 and guide tube 2 into a central distribution chamber for the hot gas and a surrounding collection chamber 11 for the cooled gas. The gas, which enters through an inlet connection 1 and leaves through an outlet 12, is cooled by heat exchange with water entering the shell at 14 and leaving at 15 as high pressure steam. The partition 3 and tube 2 are made of nitriding resistant material, and nitriding resistant cladding 8 covers the tube sheet 4 within the central area bounded by the partition 3. To protect the inlet connection against inadmissibly high temperatures, cold gas is injected through a bore 13; this gas then mixes in chamber 11 with the cooled recycle gas whose temperature has been lowered to a level below the nitriding temperature.
Patent GB-672732-A (GB)
Title: Improvements in or relating to electric current rectifiers
Inventor: MAYER SIMON ERNEST
IPC: H01L21/479
Filed: 1949-08-26
Abstract: 672,732. Asymmetrically-conducting resistances. STANDARD TELEPHONES & CABLES, Ltd. Aug. 25, 1950 [Aug. 26, 1949], No. 22203/49. Class 37. A rectifier comprises a semi-conductor layer separated by a barrier layer from the counter electrode, the semi-conductor layer being deficient in oxygen in comparison with the barrier layer. Preferably the semi-conductor layer is titanium dioxide in conducting condition and the barrier layer is a thin film of titanium dioxide in non-conducting condition. Titanium dioxide is compressed to a disc having a density of 3.5, is dried and heated to 1050 C. for 1¢ hours and then to 1300 ‹ C. for an hour, being allowed to cool in a hydrogen atmosphere which may contain nitrogen. A base electrode of silver is deposited, the opposite face being polished and heated to 500 ‹C. in an oxygas flame; alternatively, this surface may be oxidized chemically or electrolytically, e.g. by anodic treatment in sulphuric or oxalic acid. A separate barrier of titanium dioxide layer may be deposited from titanium tetrachloride or butyl titanate. A counter-electrode of lead foil or tellurium is then applied, or a silver counterelectrode may be deposited; if tellurium is used, it may be mixed with a metal oxide, e.g. thallic oxide. Barium or other titanate may be used in place of titanium dioxide, or the titanium dioxide, or the titanium dioxide may be mixed with other metallic oxides. Where a back-plate is required to give rigidity, a layer of iron particles and a layer of the semi-conductor are sintered, or titanium dioxide may be deposited on an iron plate by the decomposition of butyl titanate. Specification 569,388, [Group II], is referred to.
Patent GB-633515-A (GB)
Title: A shock absorber for use on motor cars or other similar sprung vehicles
IPC: B60G11/14
Filed: 1947-08-11
Abstract: 633,515. Road-vehicle spring-suspensions; shock-absorbers. ADAMSON, S. B. Aug. 11, 1947, No. 22211. [Classes 108 (ii) and 108 (iii)] A vehicle shock-absorber comprises a boxshaped housing 1 secured to the chassis and having an open side to which a cover 8 (Figs. 2, 6, not shown), is secured by studs 7 and associated nuts. Springs 4a-4d are loaded by means of a member 2 which is journalled in the cover 8 and the opposing face of the housing 1. The member 2 is actuated by a crank-arm (Figs. 2, 6) which is connected to the axle by a link 15, Fig. 7. A resiliently-mounted bolt 21 is carried by a member 16 pivotally secured to the lower end of the link 15. The bolt 21 is secured by a nut 21<SP>1</SP> to one of a series of alternative holes 18<SP>1</SP> in a member 18 rigid with the axle.
Patent GB-442029-A (GB)
Title: Improvements in or relating to the manufacture of hydrogen peroxide
IPC: C01B15/03
Filed: 1934-07-30
Abstract: <PICT:0442029/III/1> Hydrogen peroxide is obtained by heating aqueous solutions of persulphuric acid or persulphates and distilling off the resulting hydrogen peroxide under reduced pressure in two or more stages with intermediate dilution of the remaining liquor by addition of water or steam prior to the second and any subsequent distillation stage.  Dilute persulphuric acid is introduced into a steam jacketed coiled glass tube 1, the products passing to a liquid-vapour separator 4 from which the liquid passes through a suitable seal to a second steam-heated tube 2.  Steam or water is introduced by a tube 17.  A separator 5 separates the residual liquid from peroxide and water vapours which are led, together with those from separator 4, to condensing or rectifying apparatus.  The pressure throughout the apparatus is maintained at 120--200 mm. while the temperature preferably does not exceed 120 DEG  C.  Different pressures and temperatures may, however, be used in the two stills.  One example describes the distillation of persulphuric acid in a steam-jacketed vertical helical coil at a pressure of 90 mm., sealed at its lower end to a separator, the liquid residue being diluted with an equal volume of water and re-distilled in the same coil.  Batch methods can also be used. The amount of water added is such that the combined distillate contains about 1--6 per cent by weight of hydrogen peroxide. Specification 390,549 is referred to.  The Specification as open to inspection under Sect. 91 comprises also the addition of water during the distillation.  This subject-matter does not appear in the Specification as accepted.
Patent GB-1143424-A (GB)
Title: Improvements in or relating to frequency- and time-proportional signal control devices
IPC: G05D11/13
Filed: 1966-05-19
Abstract: 1,143,424. Selective signalling. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 19 May, 1966 [22 May, 1965], No. 22255/66. Heading G4H. In a system which produces an output signal whose duration is dependent upon the difference in frequency between a measured frequency fm and a nominal frequency fn, cycles of the measured frequency are counted Z, Fig. 1, until a time base pulse occurs after a period t M  from the instant that counting commenced, which causes either gates G v1  and G v2  to be opened and clock pulses of frequency ¢fp to be merged additively with the cycles of fm, or gates G R1  and G R2  to be opened and clock pulses of frequency ¢fp to be merged subtractively with the cycles of fm, in accordance with whether the count reached when the pulse t M  occurred was less than (Fig. 2a), or greater than (Fig. 2b), a preset count Z s  being the count which would be attained in a period t M  if the measured frequency fm equalled to nominal frequency fn - and counting at the new rate of fm + ¢fp or fm - ¢fp continues until the counter is zeroized and the gates closed. A signal is present on one of leads AV and AR for the duration for which counting at the modified rate continues; this signal has a duration of when fm < fn, and a duration of when fm > fn.
Patent GB-727656-A (GB)
Title: Improvements in or relating to loud-speaking telephone systems
Inventor: LAURENCE ROGER FREDERIC
IPC: H04M9/10
Filed: 1951-09-24
Abstract: 727,656. Two-way transmission. WINSTON ELECTRONICS, Ltd. Aug. 5, 1952 [Sept. 24, 1951; Nov. 6, 1951; Nov. 6, 1951], Nos. 22310/51, 25972/51 and 25973/51. Class 40 (4). In a loud-speaking telephone system wherein a proportion of the signal in each channel is rectified and compared by a circuit which mutes the channel producing the smaller, and one of the channels is muted at any time, the rectifier has a condenser input filter having a pick-up time of three milliseconds or less and a much longer discharge time, also the ratio of signal current to resulting control voltage is greater in the case of the muted channel than in the unmuted one. In the system, Fig. 2, speech voltages from each direction of transmission are sampled at Y and Z and applied after amplification in valves V7, V9 and rectification in MR1-4 to a commoncathode triggered pair V11, V12 to mute the unwanted direction of transmission. The muting is effected by the connection by relay A of resistors R17, R18 across points TU and VW in the microphone and loudspeaker amplifiers respectively. The sampled microphone output from point Y comprising the voltage induced in the secondary of transformer T3 reinforced by the output from the centre tap of resistors R6, R7 is applied to rectifiers MR1, MR2 via a high isolating resistance R30 and cathode follower V8. The sample of the incoming signal is similarly applied to rectifiers MR3, MR4, but to provide a bias on valve V10 opposite to that from MR1, MR2. Relay B connects a low resistance shunt across the rectifier pair proper to the unwanted direction. The microphone output to line is applied in parallel to two windings P, Q of line transformer T1 and the loud-speaker input windings r, s are connected in phase opposition to eliminate the transfer of microphone currents to the loud-speaker. Modification of the amplifier arrangement for three or four-wire working by dispensing with the line unit valves V3, V4 and transformer T1 is also described, and in a further embodiment, Fig. 3 (not shown), three relays are included in the bathode-coupled triggered pair. Muting in this embodiment is achieved by disconnecting the loud-speaker circuit, and the output of the control rectifier proper to the unwanted direction is also reduced by a relay.
Patent GB-1434366-A (GB)
Title: Fire escape
IPC: A62B1/20
Filed: 1972-05-12
Abstract: 1434366 Fire escape DEFENCE SECRETARY OF STATE FOR 13 Aug 1973 [12 May 1972] 22345/72 Heading A5A A fire escape which can be suspended from a building or fireman's ladder comprises a plurality of platforms 1 linked by flexible means 2 so that when deployed the platforms are suspended in a vertical series, each platform comprising a floor 3 in which an aperture 5 is provided through which a human being can pass for descent to the next platform. The aperture may form “-1/3 of the area of each platform, apertures in adjacent platforms being diametrically oppositely situated. The platforms may be of flame-proof fabric supported on a hoop 4 of steel, cartoon-fibre reinforced plastic or glass fibre-reinforced plastic, and the links may be chains, wire or carbon filbre-reinforced rope. The platforms may be enclosed in a flame-proof flexible housing 7, e.g. of high temperature polyimide film, which may be translucent or transparent and/or lights 8 may be provided. A rope 6 may hang down from each platform to assist descent to the next.
Patent GB-334335-A (GB)
Title: Improvements in winding and tensioning devices for wires, ropes and the like
IPC: F16G11/12
Filed: 1929-07-20
Abstract: 334,335. Highfield, J. S. July 20, 1929. Wire and rope strainers.-A wire or rope strainer, applicable for example in straining fence wires or in taking in the sheets of headsails, comprises a pulley having two portions of different diameters, each portion being formed with a circumferential groove capable of receiving a number of turns. The grooves are connected by a 'diametral slot e or other passage which may be inclined as in Fig. 1 from the bottom of the groove b in the portion of smaller diameter to the groove a in the portion of larger diameter or, as in Fig. 3, may be horizontal. The mechanical advantage is obtained by leading the wire from the portion of smaller diameter, through the slot and around the portion of larger diameter from which it is drawn off, a shorter length being drawn on to the smaller portion when the wire is pulled off the larger portion. When no straining action is required the wire is drawn directly off the smaller portion through the slot, which then serves as a fairlead.
Patent GB-341838-A (GB)
IPC: B23K11/24
Filed: 1930-07-24
Abstract: 341,838. Welding. INTERNATIONAL GENERAL ELECTRIC CO., Inc., 120, Broadway, New York, U.S.A.-(Assignees of Allgemeine Elektricitats-Ges. ; 2, Friedrich Karl-Ufer, Berlin.) July 24, 1930, No. 22357. Convention date, July 25, 1929. [Class 83 (iv).] In an automatic electric-flash welding machine, a relay is provided, which is operated by the current increase and/or decrease of pressure if the parts to be welded stick together, so as directly or indirectly to stop or reverse the drive for moving the parts towards each other. When sticking has been eliminated the relay is put out of action and the drive again put in. A relay c in the secondary circuit b of the transformer is energized, if the parts stick together, so as to close, against the action of a spring d, a circuit e, through a winding f to reverse the switch g of the driving motor m. In a second form the relay acts through the winding to operate a switch to stop the motor, which may be rapidly stopped by an automatic brake, preferably electrical. The switch mechanism for stopping the feed can be replaced by a disengageable coupling, or that for reversing the feed can be replaced by couplings or change gears, the couplings being preferably electromagnetic. The relay may be arranged in the primary instead of in the secondary circuit of the transformer.
Patent GB-421714-A (GB)
Title: Improvements in trimming means for sewing machines
IPC: D05B37/08
Filed: 1934-07-31
Abstract: 421,714. Sewing machines. SPIELMAN, A., 440, South 56th Street, Philadelphia, U.S.A. July 31, 1934, No. 22366. [Class 112] A trimming mechanism for a sewing-machine comprises a driven rotary cutting wheel and an anvil disc, the cutting wheel being capable of radial adjustment with respect to the anvil disc. As the needle 5 of the machine reciprocates, oscillatory movement is imparted to the component 43 of the clutch 42 through the vibratory arm 63 and link 59, by means of the wedging action of the clutch rollers 47. The inclines 50 of the notches in the component 43 and the inner surface of the drum flange 48 of the component 44, causes the shaft 16 and hence the cutting wheel 17 to be intermittently turned in the direction of the arrow, Fig. V. As the cutting wheel 17 is firmly held in pressure contact with the freely revolving anvil disc 25 on the throat plate 3, the material is cut as it is fed forward. In the example shown, the zigzag periphery of the cutting wheel makes a correspondingly shaped edge 90, Fig. X. The wheel 17 may be shifted relatively to the needle by the thumb nut 39, Fig. 11, to vary the distance of the cut from the seam 89. The movements of the cutting wheel are adjusted to correspond with those of the feed dog by adjusting the stud 58 in the slot 37 of the clutch arm 56, and effecting a firm adjustment by the eccentric fulcrum pin 66.
Patent GB-592613-A (GB)
Title: An improved machine for grinding or polishing granite, stone, marble and like materials
IPC: B24B27/00
Filed: 1939-08-02
Abstract: 592,613. Grinding and polishing stone. CASSIE. F. B. Aug. 2, 1939, No. 22373. [Class 60] In a radial type grinding or polishing machine for surfacing granite and the like in which a main upright support carries a radial arm mounted to swing about the support and vertically adjustable thereon, a toggle arm pivotally attached at its inner end to the outer end of said radial arm, and a vertically adjustable tool spindle mounted on the outer end of said toggle arm, there is provided an electric. motor carried by the toggle arm and mechanism operatively connecting the said motor to the tool spindle. Rotatably mounted on a tubular column 1 is a vertically adjustable radial arm 4, to the bifurcated outer end of which is pivoted, about vertical pivot pins 11, a toggle arm 13 carrying on an inner rearward extension an electric motor 21 which is free to swing between the forked limbs of the arm 4. The outer bifurcated end of the toggle arm 13 carries a vertical tool spindle 16 carrying a tool 32 and being vertically slidable in a sleeve 15, being so mounted therein as to be rotatable with it. The upper end of the spindle 16 is associated with a counterbalancing weight 27, while a lockable handle 28 engages a collar on its lower end to control vertical movement of the spindle. The sleeve 15, and thus the spindle 16, is rotated by worm reduction gearing 17 driven, through an enclosed shaft 20 and flexible couplings 19, by the motor 21.