baber/WOPTO huggingface dataset:
Patent GB-536583-A (GB)
Title: Improvements in stable band-pass amplifier circuits
IPC: H03F1/36
Filed: 1939-10-19
Abstract: 536,583. Valve amplifying and generating circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., RUST, N. M., BRAILSFORD, J. D., and GOODENOUGH, E. F. Oct. 19, 1939, No. 28258. [Class 40 (v)] A negative impedance effect, independent of valve constants, for providing stable re-action so as to give sharp tuning in a band-pass amplifier, is produced in a multi-valve stage by including in the cathode leg of each valve a negative feedback circuit such that the product of the impedance of the feedback circuit and the mutual conductance of the associated valve is considerably greater than unity. Fig. 2 shows an arrangement in which positive feedback is obtained by the common cathode network ZIV, and this impedance producing positive feed-back may have a value large enough to cause the valve to oscillate. The intervalve coupling ZII comprises a parallel tuned circuit and similar circuits ZI, ZIII in the cathode leads provide negative feedback. Circuits of very low Q are preferably used and the grid-cathode capacity may be tuned out by coupling the coils in the grid and cathode circuits and the cathode-anode capacity may be tuned out by coupling inductances in the anode and cathode leads, compensation for grid-cathode capacity may also be obtained.
Patent GB-598499-A (GB)
Title: Apparatus for removing covers from receptacles
IPC: B67B7/12
Filed: 1945-10-26
Abstract: 598,499. Removing closure-discs from milk bottles. WAREN, F. A. O., and WILSON, L. G. Oct. 26, 1945, No. 28272. [Classes 66 and 125 (ii)] A closure-disc is removed from a milk bottle by putting a flanged cap 1 over the top and impaling the disc with a spiked knife 9 on the end of a lever 6 having a thumbpiece 8. The cap 1 and disc are lifted off together. Specification 18496/13, [Class 66], and U.S.A. Specification 1,820,999 are referred to.
Patent GB-1445505-A (GB)
Title: Electrolytic recovery of silver manufacture of knitted articles
IPC: C25C1/20
Filed: 1974-06-26
Abstract: 1445505 Recovering silver by electrodeposition CIBA-GEIGY AG 18 June 1975 [26 June 1974] 28330/74 Heading C7B Ag is recovered from a spent colour photographic bleach-fix solution 5 containing Ag ions and ferric ions by electrolysis in a cell 1 to deposit Ag on the rotating cathode 3, whilst continuously monitoring the redox potential of the solution, e.g. using a Pt + calomel pair of electrodes 4 connected to a milli-volt meter 8, and adding automatically a reducing agent, e.g. sodium dithionite, hydrazine, hydroxylamine, alkali metal (hypo) phosphite or borohydride, or ascorbic or sulphinic acid, either in aqueous solution 16 e.g. using a peristaltic pump 13 Fig. 1, or as powder e.g. in hopper 17 using an electrically driven Archimedian screw 18 Fig. 2, to the solution 5 when the redox potential rises above a predetermined level (-300 mV), e.g. using a potentiostat 9 connected to the meter 8 and a solenoid 10 which actuates a relay 11 in an electrical circuit powered by A.C. source 12 and which operates pump 13 or screw 18. The cathode may be of steel and the anode may be of carbon. The bleach-fix solution may contain a ferric-chelate complex as oxidizing agent and a water-soluble thiosulphate or thiocyanate as silver halide solvent or fixing agent, e.g. ferric ammonium EDTA, ammonium thiosulphate and sodium sulphite.
Patent GB-915827-A (GB)
Title: Improvements in or relating to pressure exchangers
Inventor: BARNES JOHN ANTHONY
IPC: F04F13/00
Filed: 1960-08-16
Abstract: 915,827. Charging engines. POWER JETS (RESEARCH & DEVELOPMENT) Ltd. Aug. 4, 1961 [Aug. 16, 1960], No. 28432/60. Class 7(2) [Also in Group XXVIII] The cell rotor 20-22 of a pressure exchanger is driven through a shaft 23 from an I.C. engine (not shown) and the effective opening of a bleed flow path between the high pressure engine exhaust inlet duct 34 and the low pressure outlet duct 33 is controlled by a valve 38 connected by a rod 37 to a conventional centrifugal governor 36. Ambient air is admitted through an inlet duct 32 and after compression is discharged through a duct 35 to the intake manifold of the engine. In a modification the governor-controlled bleed valve is of the rotary type and in a further modification the high pressure inlet duct communicates with the cells through a volute 50, Fig. 7 (not shown) connected by toothed gearing and a lever to the governor whereby the valute is angularly adjusted with respect to a fixed end plate of the pressure exchanger resulting in bleed ports in the valute being brought into or out of register with bleed passages in the said fixed plate.
Patent GB-463449-A (GB)
Title: Improvements in control valves for liquid elevating apparatus
Filed: 1935-10-15
Abstract: 463,449. Raising liquids. EXLEY, W. H., and HADDON, W. Oct. 15, 1935, No. 28462. [Class 102 (ii)] Relates to liquidraising apparatus of the type described in Specification 399,918, in which the liquid is discharged by compressed gas from two chambers acting alternately, and the invention consists, primarily, in resilient mountings for the control valves. Each liquid chamber is connected to a valve chamber 1, which is alternately connected, by a doublebeat valve 14, to a passage 4 supplying compressed gas, and to a passage 21 communicating with the atmosphere. The lower end of the valve rod 9 is hollowed to receive a plunger 30, acted on by a spring 29, the compression of which is adjustable by means of a screwed bush 31. The valves of the two liquid chambers are operated by a cam 34, engaging a hole in a lever 35, which operates the valve rods through tappets 33, having adjusting screws 36. The tappets may carry bells 38 dipping into liquid seals 39. In a modified apparatus intended for use with corrosive liquids, the exposed parts are of lead or lead alloy. The valve 14 is of lead &c. and encloses the steel rod 9 and is extended to form a sleeve passing through the stuffing-box 23, the gland 24 of which is of lead cast on a steel core. The lower portion of the valve rod housing the spring '29 is of aluminium bronze &c., and is screwed to the upper steel portion 9.
Patent GB-173862-A (GB)
Title: Improvements in or relating to the construction of reinforced concrete floors, decking and the like
IPC: E04B5/28
Filed: 1920-10-07
Abstract: 173,862. Williams, E. O. Oct. 7, 1920. Centering for floors.-Concrete floors are cast by means of channel-shaped metal moulds g having outwardly-turned flanges k and resting on temporary boards h bolted to the joists a. The open ends of the moulds are closed by precast slabs e which may be reinforced by expanded metal or wire netting projecting at the lower edge and overlapping under the joists. Rods f may project between the flanges for the attachment of ceiling lathing.
Patent GB-285070-A (GB)
Abstract: 285,070. Koppers Co., (Assignees of Lovett, J. A. B.). Feb. 12, 1927, [Convention date]. Cleaning, fluid - pressure processes for.-Carbon deposits are prevented from accumulating on the insides of coke ovens by applying a fluid blast at suitable intervals. In the example shown the pusher ram 3, Fig. 2, for pushing coke out of the oven, which may be driven by an electric motor 5 and gear mechanism 6, carries on its head 4 a set of nozzles 16 connected by a pipe 15 to a flexible hose 14 wound on a drum 13, pressure air passing into this hose through the axle of the drum from a compressed air tank 10 operated by a compressor 11. The hose is kept taut by weights 27, Fig. 6, connected by a string 25 to a small drum 24 mounted on the axis of the reel. The blast is admitted at suitable times by a valve which is controlled by a solenoid energized by switches actuated by the movements of the pusher ram.
Patent GB-285442-A (GB)
Abstract: 285,442. I. G. Farbenindustrie Akt.- Ges. Feb. 16, 1927, [Convention date]. Trisazo dyes.-Fast blue dyeings are obtained by treating with a copper compound fibres dyed with a triazo dyestuff containing as first component an aminosalicylic or aminocresotinic acid, or a derivative thereof, amines of the benzene or naphthalene series having a free pposition as middle components, and as end component 2- amino-5-naphthol-7-sulphonic acid or a derivative or substitution product thereof (coupled alkaline). In an example cotton dyed with p-aminosalicylic acid-azo-1-naphthylamine-7-sulphonic acid-azo-1- naphthylamine-azo-2 : 5 : 7-acid (alkaline coupling) is treated with copper sulphate. The first component may alternatively be a sulphonated p-aminosalicylic acid or an aminocresotinic acid. 1-naphthylamine-6-sulphonic acid is also specified as a middle component, and 2-phenylamino-5- naphthol-7-sulphonic acid as end component. Specification 3673/00 is referred to.
Patent GB-225570-A (GB)
Title: Improvements in wireless receiving apparatus for eliminating disturbances
IPC: H04B1/12
Filed: 1924-11-29
Abstract: 225,570. Levy, L. Nov. 30, 1923, [Convention date]. Atmosp,herics and undesired signals, eliminating or limiting; thermionic heterodyne receivers. - In an " atmospheric " eliminating s y s t e m , two identical receiving circuits 1, 3, 5, and 2, 4, 6, are employed slightly out of tune with the signal, preferably one above and one below, and are connected to two valves 7, 8 connected in opposition so that in the output 24, 25 impulses are balanced out, while signals in the two circuits are out of phase in opposite senses and, due to the retro active couplings 21, 22, each tends to become 90 out of phase so that the two are additive in the output 24, 25. In a modification, two stages of balanced valves are employed, and additional stages may be added. Further selection may be made on a modulating frequency introduced either at the transmitter or at the receiver to give audible or supersonic beats. Fig. 3 shows the additional circuit which may be connected to the output 24, 25, Fig. 1. The plate circuits 59, 61 and 60, 62 are mistuned relatively to the modulating frequency and the output is tuned to the modulating frequency. In the reception of double modulated waves, four frames tuned in pairs to the frequencies may be employed. The Specification as open to inspection under Sect. 91 (3) (a) also describes the connection of a frame aerial, with or without an associated local heterodyne, to the input 24, 25 of the circuit shown in Fig. 3. This subject-matter does not appear in the Specification as accepted.
Patent GB-933500-A (GB)
Title: Nuclear fuel element
IPC: G21C3/62
Filed: 1961-08-09
Abstract: 933,500. Nuclear fuel elements. NUCLEAR MATERIALS & EQUIPMENT CORPORATION. Aug. 9, 1961 [Aug. 23, 1960], No. 28733/61. Class 39 (4). A nuclear fuel element comprises a compacted mass of pellets of fissile material, each pellet having a coating of at least one layer of a material which protects the fissile material from corrosion (which may occur as a result of leakage of the cladding, particularly at welded joints), helps to retain fission products, and provides additional mechanical strength to improve dimensional stability under irradiation, the coatings being deformed but not broken during the compacting process so that the compacted mass has a lattice of the deformed but unbroken coatings with the fissile material contained in the lattice cavities, and the pellets being deformed so that the density of the element approaches that of a solid block of the fissile material, e.g. in excess of 90%. One method of manufacture is illustrated in Fig. 2, a dense mass 15 of the pellets enclosed in a tube 17 of Zr, Nb, Zr-Nb alloy, or stainless steel closed by rubber stoppers 19 being passed through a swaging machine where it is repeatedly impacted by dies 21. The compacting may also be effected by hot or cold extrusion. The stoppers 19 are subsequently removed and metallic end plugs inserted and welded in place. Suitable materials for the pellet coatings are; Al, Cu, Ni, Fe, Si, Cr, Nb, V, W, Mo, Zr, Ti, Yt, Mg, Be, C, V-Nb alloy, Mo-W alloy, Mg-Be alloy, Fe-Cr alloy, stainless steel, Al 2 O 3 , Yt 2 O 3 , ZrO 2 , SiC, and BeO. The coatings may be single layers or several layers of different materials, one encasing the other, each layer including at least one of the above materials.
Patent GB-754186-A (GB)
Title: Presser device for sewing machines
IPC: D05B27/04
Filed: 1954-10-06
Abstract: 754,186. Sewing-machines. SINGER MANUFACTURING CO. Oct. 6, 1954 [Oct. 9, 1953], No. 28772/54. Class 112. The presser foot of a sewing-machine is lifted to an intermediate position, suitable for embroidering or darning, by means of a cam 34 pivoted at 33 to the faceplate closing the hollow head of the sewing- machine, a surface 35 on the cam co-operating with the head of a stud 38, securing a collar 39 to the presser bar 18, so as to lift the presser bar against a spring 19 when the cam is turned to its operative position by means of a fingergrip 37 carried at the end of an arm 36 extending from the cam; and the head and face-plate are formed with an indendation 41 which accommodates the finger grip when the cam is in the inoperative position. A leaf spring 42, carried by the cam, has a free end which projects through the latter and which enters a notch in the face-plate when the cam is in its inoperative position.
Patent GB-1505077-A (GB)
Title: Porous diaphragms
IPC: C25B13/08
Filed: 1974-06-28
Abstract: 1505077 Seaming non-metallic sheet material IMPERIAL CHEMICAL INDUSTRIES Ltd 20 June 1975 [28 June 1974] 28804/74 Heading B5K [Also in Division C3] A porous diaphragm for an electrolytic cell is made from a plurality of sheets of filled polytetrafluoroethylene, i.e. polytetrafluoroethylene sheets containing removable solid particulate additive, by fusing a fluorine-containing polymer into the sheets at or near juxtaposed edges of the sheets at a temperature which will not substantially decompose the filler in the sheets, solidifying the fluorine-containing polymer so as to effect joining of the sheets and thereafter removing filler from the thus joined sheet. In one embodiment, juxtaposed edges of two filled polytetrafluoroethylene sheets are overlapped with a strip of the fluorine-containing polymer. Heat and pressure is applied between heated platens to effect joining. The platens may be lightly greased with silicone grease to prevent sticking. In another embodiment, one or more strips of fluorine-containing polymer are made to partially overlap and are fused to one or more edges of a filled PTFE sheet. The protruding portions of the strips are used to bond the sheet to other PTFE sheets which have not had strips fused to their edges. In a modification, the strips are replaced by tabs at intervals along one or more edges of a filled PTFE sheet. Preferably, the temperature at which the fluorine-containing polymer is fused into the PTFE sheet is lower than the melting point of PTFE. Specified fluorine-containing polymers are polychlorotrifluoroethylene, polyvinylidene fluoride, a fluorinated ethylene/propylene copolymer or an ethylene/chlorotrifluoroethylene copolymer. Specified fillers for the PTFE are starch, e.g. maize and/or potato starch, waterinsoluble inorganic bases or carbonates, e.g. calcium carbonate, and cellulose. In addition, the PTFE may contain a non-removable filler, e.g. titanium dioxide, to render the diaphragm wettable when installed in an electrolytic cell. In Example 1, laminated starch-filled PTFE sheets prepared according to Example 1 of Specification 1,424,804 and having a mesh gauze woven of monofilament polypropylene yarn laminated thereto are butt-joined using an FEP strip laid along and fused to the butt joint. In Example 2, the polypropylene gauze is replaced by an FEP backing sheet. In Example 3, cellulose is used as filler and an FEP backing sheet is used. In Example 4, starch is used as filler, an FEP backing sheet is used and the fluorine-containing polymer is a strip of a copolymer of ethylene and chlorotrifluoroethylene.
Patent GB-996977-A (GB)
Title: Improvements in or relating to cast-iron
IPC: C22C37/00
Filed: 1961-08-09
Abstract: A white solidifying cast iron comprises .C.3.1-3.8% .Si.1.5-3.0% .S.0.1-0.2% .Mn.less than 0.15% the balance being iron and any impurities, among which P is preferably not more than 0.15%.  The alloy is suitable for centrifugally casting hollow members, especially thin walled ones. The heat treatment used may be a stress relieving anneal, a graphitizing anneal at 900-950  DEG C. followed by slow cooling.
Patent GB-190851-A (GB)
Title: Improvements in or relating to railway signalling apparatus
IPC: B61L21/04
Filed: 1921-10-31
Abstract: 190,851. Automatic Telephone Manufacturing Co., Ltd., and Hudd, A. E. Oct. 31, 1921. Addition to 166,703. Wire and rod compensators; slots, reversers, and the like.- In apparatus of the kind described in the parent Specification, the spindle 6, to which the signal lever 10 is secured, is mounted in two bearings in a U-shaped frame 1, 5 and the chain drun@ 7 is mounted independently upon a boss on the part 5. The clutch-member 11 is formed of a clutch part 34 and two parallel plates between which the mechanism 15, 22, 24 is mounted. The plates carry lugs 11<a> which slidingly embrace a squared portion 9 of the shaft. A straight-cored electromagnet 17 is carried by the member 11 and, being energized, attracts its armature 19 which is pivoted at 21. A shoulder 30 of the armature thereupon moves a rod 31 and, through a spring 32, presses a roller 12 on the inner surface of the chain drum and the subsequent rotation of the drum by the chain carries the roller up to the lever 15. The lever 15 is, however, locked by the mechanism 22, 24, while the electromagnet is energized, and therefore the roller 12 forces the member 11 to move endwise into clutching engagement with the chain drum. The roller' 12 may be a spiral spring or a short cylinder with deep cross-cuts so that it will bed itself on to the surface of the drum. The pivot 27 is provided by an eccentric pin so that the mechanism may be adjusted. Leads from the terminal box 40 are brought through the hollow shaft 6 and terminate in plugs which fit into sockets on the member 11 from which permanent connections are taken to the electromagnet.
Patent GB-698231-A (GB)
Title: Improvements relating to cutting-off devices for book-stripping machines
IPC: B42C9/02
Filed: 1947-10-29
Abstract: 698,231. Bookbinding. HOPE, jun., T., and ROTHWELL, J. Sept. 4, 1948. [Oct. 29, 1947] No. 38845/47. Class 16. [Also in Group VIII] In a machine wherein lengths of adhesivecoated strip are cut from a continuous strip and attached to the backs of sets of collated sheets, the strip - cutting blade 5 is driven through a friction coupling and is held stationary by an Þlectromagnetically-controllÚd device which is operated to release the blade by a switch 19 having an actuating member 18 in the path of the successive sets of sheets to be united by the severed strips. The movement of the member 18 by the leading edge of a set of sheets closes the switch 19 to energize electromagnets 8 which attract an armature 14 attached to a spring-pressed lever 9 to move the latter away from a projection 5a on a bladecarrying member 1. The friction-drive then rotates the knife 5 to sever the strip in advance of the set of sheets. The switch 19 comprises a make-and-break device so that immediately after the switch is closed, it is re-opened to reset the lever 9. The energizing of the magnets 8 may hold the lever 9 in operative position in which case movement of the member 18 by the leading edge of a set of sheets opens the switch.
Patent GB-1196303-A (GB)
Title: Screening Apparatus
IPC: B01D35/28
Filed: 1967-06-22
Abstract: 1,196,303. Screening apparatus. BAUER BROS. CO. 22 June, 1967 [29 June, 1966], No. 28915/67. Heading BID. Screening apparatus for slurry comprises an inclined screen of which adjacent sections 38, 39, 40, over which slurry flows successively, are inclined at respective angles of 150, 140, 130 degrees to the vertical. Slurry is supplied from container 19, which acts as a preliminary settling tank, over lip 20 and section 21, coplanar with screen section 38. Plate 26 is adjustable to regulate flow and the screen rests on supports 29 whose angles of inclination on side walls 28 are adjustable. The screen comprises longitudinal bars bridged by cross-bars whose respective centre portions are displaced in the direction of slurry flow relative to their ends by virtue of their slight curvature. This causes rolling of fibrous material and obviates streaming along the longitudinal bars.
Patent GB-814075-A (GB)
Title: Process and catalyst for oxidation of methanol to formaldehyde
IPC: C07C45/38
Filed: 1955-10-11
Abstract: A catalyst suitable for use in the oxidation of methanol to formaldehyde is prepared by mixing iron oxide-molybdenum oxide catalyst, which has become spent in this reaction, with at least an equal amount of catalyst precursor prepared as claimed in Specification 814,073 and activating the mixture by heating and air blowing.  The spent catalyst may first be sieved to remove particles finer than 20 mesh Tyler and larger than 4 mesh Tyler. Alternatively the unsieved spent catalyst may be mixed with a slurry of the catalyst precursor prior to drying.  The catalyst may be used with higher methanol-air feed ratios than catalyst obtained wholly from catalyst precursor, and also the activity of the catalyst is retained for longer periods.ALSO:Formaldehyde is produced by the oxidation of methanol in the presence of a catalyst prepared by mixing iron oxide-molybdenum oxide catalyst, which has become spent in this reaction, with at least an equal amount of catalyst precursor prepared as claimed in Specification 814,073 and activating the mixture by heating and air blowing (see Group III).  The catalyst may be used with higher methanol-air feed ratios than catalyst obtained wholly from catalyst precursor.
Patent GB-747029-A (GB)
Title: Television transmitters having noise reduction circuits
IPC: H04N5/18
Filed: 1953-10-20
Abstract: 747,029. Television. RADIO CORPORATION OF AMERICA. Oct. 20, 1953 [Nov. 14, 1952], No. 28983/53. Class 40 (3). [Also in Group XL (c)] A television transmitter having a modulator stage 17, a radio-frequency output stage 19, and a direct-current restoration circuit 28, 51 in conjunction with the modulator stage, the output stage being modulated to produce a maximum output during synchronizing pulses, is characterized by a noise reduction circuit including a peak detector 65 of line synchronizing pulses coupled to the output stage and arranged to derive a rectified voltage representative of the maximum R.F. excursions, and amplifier means 71 to feed back said rectified voltage so as to modulate the voltage level above ground of the entire rotoration circuit in accordance with variations in the amplitude of said maximum excursions. The restoration circuit comprises a pair of diodes 53, 55 rendered conducting during the synchronizing pulses or back porch by pulses derived through phase splitter 28 from transformer 25, and the voltage fed back through amplifier 71 is applied across a resistor 41 or a transformer connected in the cathode circuit of the phase splitter. Amplifier 71 has a response extending from a few cycles per second (say twenty to thirty) up to seven or eight hundred and possibly to five or six thousand. The amplifier incorporates a gain control. The correct phase of voltage fed back for a video input to stage 17 extending in the negative direction is obtained with a negative detector as shown and a single stage resistance coupled amplifier.