baber/WOPTO huggingface dataset:
Patent GB-1424670-A (GB)
Title: Circuit arrangements
IPC: H04B3/14
Filed: 1972-04-13
Abstract: 1424670 Transversal equalizer tap multipliers PLESSEY CO Ltd 6 April 1973 [13 April 1972] 17111/72 Heading H4R In a gain adjusting device for attachment to the taps of the delay device in a transversal equalizer the tap signal is applied from a low impedance source V s  to the junction between a resistor R 0  and the source drain path of an fet 1, the other terminals of which components are connected to the terminals i + and i - of a difference amplifier, while the gate of the fet is fed from an integrator circuit 2 to which a signal dependent on the equalizer signal and error signal is applied. In the prior art, Fig. 1 (not shown), the common terminal of the fet 1 and resistor R 0  was fed with the tap signal derived from a constant current source, which provided a non-linear relation between the fet gate signal and tap gain. In the preferred embodiments the integrator input is derived from a modulator 6 fed with the tap signal V s  and the error signal, or error polarity E p . Fig. 4a shows one form of modulator including a differential amplifier to supply an inverted version of the tap signal V s  with the normal or inverted V s  signal selected by switching of fet's 8 and 9 by the error polarity signal E p . A modification of the circuit using only the one phase of the error polarity signal is shown in Fig. 4b. The signal handling capacity of the fet 1 can be increased by adding half the tap signal voltage V s  to the fet gate as in Fig. 5, with modifications to provide equal charging signals for positive and negative errors. A further modification feeds the modulator with tap signal polarities (V sp ) rather than magnitudes and polarities, Fig. 6 (not shown), while in a further modification, Fig. 7 (not shown), the modulator is fed with magnitude and polarity of both tap signal and error signal.
Patent GB-276480-A (GB)
Title: A combined luminous ophthalmoscope and retinoscope
IPC: A61B3/12
Filed: 1926-07-08
Abstract: 276,480. Keeler, C. H. July 8, 1926. Ophthalmoscopes. - Comprises an instrument for facilitating the examination of the eye which may be employed either as an ophthalmoscope or as a retinoscope by passing the beam of light through a series of lenses, the positions of which may be varied so that the beam reaching the eye is either divergent, parallel or convergent. The light from an electric bulb 1 contained in a tube 2 passes through lenses 7, 9, 13 and is reflected into the eye from the mirror 3, through which the eye is observed. The lens 7 is mounted in a slide 8 so that it may be completely withdrawn from the path of the rays, and similarly the lens 13 may be swung out of the ray path on the pivot 14. The lens 9 is arranged in a slide 10 so that it may be moved axially. When in its lowest position, the emergent rays are divergent and when in its uppermost position the rays are convergent permitting the instrument to be used alternatively either as an ophthalmoscope or a retinoscope.
Patent GB-462969-A (GB)
Title: Improvements in methods of preparing organic fluorine compounds
IPC: C07C17/21
Filed: 1935-06-14
Abstract: Fluorinated aliphatic hydrocarbons in which the number of fluorine atoms is at least as great as the number of other halogen atoms are made by reacting hydrofluoric acid on an aliphatic halogen-hydrocarbon in the presence of an antimony fluorohalide having a fluorine content of 10--21 per cent at at least 120 DEG  C. and at least 2,7 atmospheres pressure.  The reaction may be effected in stages, the reagents being brought into contact with a series of antimony halide catalysts of successively lower fluorine content, the first of which contains 10--21 per cent of fluorine; the first catalyst may have a relatively high content of pentavalent antimony, the succeeding ones containing a relatively high content of trivalent antimony.  Chlorine may be added to the reaction mixture.  In examples: (1) liquid hydrogen fluoride is added to a mixture of antimony penta- and tri-chlorides and a mixture of hydrogen fluoride, chlorine and perchlorethylene are then introduced at 160--170 DEG  C. and 5 atmospheres pressure, the products being fluorochlorethanes containing 3 and 4 fluorine atoms; (3) hydrogen fluoride is passed into two reactors in series each containing antimony tri- and penta-chlorides at 90--100 DEG  C. and 5 atmospheres pressure, then hydrogen fluoride and trifluorotrichlorethane are introduced into the first reactor at 150--160 DEG  C. and hexachlorethane and trifluorotrichlorethane to the second at 145--155 DEG  C.; the product being tetrafluorodichlorethane; (4) trifluorochlormethane and difluorodichlormethane are made from hydrogen fluoride and carbon tetrachloride; (8) tetrafluorodichlorethane is made from C2Cl4, C2F3Cl3, HF and chlorine in two reactors in series, the first containing a catalyst containing 6 per cent trivalent antimony and 16 per cent fluorine, and the second 40 per cent trivalent antimony and 8 per cent fluorine.  Specifications 390,289 and 391,168 are referred to.
Patent GB-144893-A (GB)
Title: An improved knife-cleaning board
IPC: A47L21/04
Filed: 1919-07-09
Abstract: 144,893. McAlpine, L. J. July 9, 1919. Knives, cleaning.-A knife-cleaning board has a square-cut uncovered gripping portion a at each end.
Patent GB-1256451-A (GB)
Title: Apparatus for injecting thermosetting plastics materials
Inventor: DEERBERG ROLF
IPC: B29C45/50
Filed: 1970-04-10
Abstract: 1,256,451. Injection moulding machines. DRABERT SOHNE. 10 April, 1970 [16 April, 1969], No. 17219/70. Heading B5A. Thermosetting plastics material is plasticized in a cylinder 1, 1a by rotation of a screw 2, forced into an annular chamber 6a by axial movement of the screw, and injected throughpassages 7d into a mould 7a, 7b by axial movement of the cylinder 1a in the chamber 6a (Fig. 5, not shown). The annular chamber 6a is formed between a cylinder 6 and a pin member- 7c having a frusto-conical end. The screw 2 is displaced by means of a cylinder 4 and the cylinder 6 by means of cylinders 8, 9.
Patent GB-1445832-A (GB)
Title: Fire protection means
IPC: C09K21/14
Filed: 1972-04-14
Abstract: 1445832 Coated product NATIONAL RESEARCH DEVELOPMENT CORP 12 July 1973 [14 April 1972] 17230/72 Heading B2E [Also in Divisions ASA and D1P] Fire protection means comprises reticulated plastics material impregnated with intumescent paint. The plastics material may be knitted strands of nylon, or a plastics foam made of polyurethane ether or ester. The intumescent paint may comprise a phosphorus-containing compound, a halogen-containing compound, an ammonium salt, or an oxide of arsenic, antimony, tin, boron, molybdenum, silicone or zinc. Preferably the paint is waterproof. Suitable waterproof paints comprise epoxy resin, a polyamide, and melamine phosphate. Preferably the reticulated plastics material is in the form of balls. Applications mentioned are the use of a block of impregnated foam located within a gas duct and which will normally allow gas to flow freely therethrough, and the placing of the impregnated foam at least partly around an aircraft internal fuel tank.
Patent GB-200510-A (GB)
Title: Improvements in the driving mechanism of disc sound recording and reproducing apparatus
IPC: G11B19/265
Filed: 1923-07-03
Abstract: 200,510. Ingram, W. H., Ingram, J., and Atkinson, E. J. R. July 4, 1922, [Convention date]. Void [Published under Sect. 91 of the Act]. Speed, regulating. - In sound-recording and reproducing machines of the kind in which a constant linear speed of the record under the stylus is produced, the position of the brake member associated with the governor is automatically varied by means actuated by the rotary movement of the tone-arm. The tone-arm, in the construction shown, is mounted in a rotatable socket 6b, to which is secured, by resilient arms (not shown), a sector-shaped plate 9. The underside 10 of the plate is inclined as shown, and against it is adapted to bear a pad 13 on a rod 12, the opposite end of which carries the brake-pad 11 with which the governor disc 14 contacts. A spring 18 may be provided to tend to raise the rod 12. The vertical position of the brake-pad 11 is varied bv the incline 10 as the tone-arm travels, thus causing the angular speed of the turntable to be increased progressively during the inward movement of the stylus. In order that the machine may be used with ordinary records, run at a constant angular velocity, the rod 12 is adapted to be moved laterally by means of a fork 20 projecting from a rotatable rod 21, so that the pad 11 may be clear of the disc 14. An arm 28 on the rod 21 carries a second brake-pad 27 which moves into operative position over the governor disc 14 when the pad 11 is shifted aside, to enable the speed to be regulated by hand in the usual way. This regulation is affected by adjusting the disc 14 vertically through the action of a cam-plate 29 on the governor spindle 17<a>. By turning a knob 33 on a spindle 31 which carries the cam-plate, the governor can be raised bodily, thus varying the normal position of the disc 14 relatively to the pad 27. The sector plate 9 may bear against rollers 38 mounted on the framework. The plate 9 may be so disposed as to move in a plane at any angle to the plane of movement of the tone-arm. If the plate is arranged vertically, the rod 12 may be controlled through a bell-crank lever or the like, or the governor spindle may be arranged horizontally. Instead of the plate 9 with an inclined plane surface, a cam with a curved surface eccentric to the tone-arm axis may be used.
Patent GB-349789-A (GB)
Title: Improvements in or relating to combined portable sound and picture kinematograph apparatus
IPC: G03B21/30
Filed: 1930-06-04
Abstract: 349,789. Kinematograph projectors. ZEISS IKON AKT.-GES., 72, Schandauerstrasse, Dresden, Germany. June 4, 1930. No. 17304. Convention date,July 20, 1929. [Class 97 (i).] A portable kinematograph projector combined with an optical sound-reproducing device is characterized in that the sound-reproducing device is arranged between the film spools, which are on parallel spindles, and the film is fed through it in a direction transverse to the common axial plane of the spools. The invention is shown applied to a portable machine similar to that described in Specification 328,160, [Class 97 (i), Optical systems &c.]. As diagrammatically indicated, a prism 5 is so arranged as to turn through a right angle a beam from a light source such as a lamp mounted on the side of the casing, the beam being projected through the film 6 as it passes through a picture gate 7. The film is fed by a constantly rotating sprocket 9 and an intermittent sprocket 10, guiding and pressure rollers 11, 12, 13 being arranged as shown. After passing the roller 13, the film is guided by rollers 14, 15, 20 through an optical device for reproducing sound from a record on the film, which device is arranged between the film spools 1, 2 as shown, and comprises a lamp 16, an optical system 17, and a light-sensitive cell in a casing 19. The spool 2 is continuously rotated through a friction clutch or belt. Specification 316,994, [Class 97 (i), Optical systems &c.], is referred to.
Patent GB-1038015-A (GB)
Title: Water-in-oil emulsifier
IPC: C09K23/00
Filed: 1964-04-27
Abstract: An emulsifier for a water in oil emulsion comprises a monofatty acid ester of an unsaturated fatty acid with a symmetrical or asymmetrical disubstituted hydroxalkylurea or hydroxyalkylthiourea.  Two general formulae for the esters are <FORM:1038015/A5-A6/1> where X, Y may be the same or different and are each one of the following <FORM:1038015/A5-A6/2> where n > 1, m \sF 1 and R is an alkyl radical having at least 10 carbon atoms which is preferably unsaturated and may contain hydroxyl groups.  The urea oxygen may be replaced by sulphur.  The emulsifier may be prepared by thermal or catalytic esterification of urea derivatives, by ester interchange from fatty acid esters by esterification via a corresponding acid chloride or by preparing an amine ester hydrochloride and converting the amino group to urea using cyanates.  16 examples of emulsifier are given.  The emulsifier is mixed with paraffin or petroleum jelly which is then emulsified with water, the product being used in cosmetics.ALSO:An emulsifier for a water in oil emulsion comprises a monofatty acid ester of an unsaturated fatty acid with a symmetrical or asymmetrical disubstituted hydroxyalkylurea or hydroxyalkylthiourea.  Two general formulae for the esters are:  <FORM:1038015/B1-B2/1> where X, Y may be the same or different and are each one of the following: <FORM:1038015/B1-B2/2> where n > 1, m   1 and R is an alkyl radical having at least 10 carbon atoms which is preferably unsaturated and may contain hydroxyl groups.  The urea oxygen may be replaced by sulphur.  The emulsifier may be prepared by thermal or catalytic esterification of urea derivatives, by ester interchange from fatty acid esters, by esterification via a corresponding acid chloride or by preparing an amine ester hydrochloride and converting the amino group to urea using cyanates, 16 examples of emulsifier are given. The emulsifier is mixed with paraffin or petroleum jelly which is then emulsified with water, the product being used in cosmetics, pest destruction or textiles industry.
Patent GB-729983-A (GB)
Title: Improvements in the production of 1.2-epoxy-cyclo-octane
Filed: 1953-06-23
Abstract: The invention comprises a process for producing 1 : 2-epoxycyclo-octane by the action of elementary oxygen on liquid cyclo-octene at temperatures up to about 150 DEG  C., with or without the usual oxidation catalysts.  By-products can be minimized by the addition of alkaline agents.  In examples, cyclo-octene containing catalyst or without has air passed vertically through it for varying times, the yields of 1 : 2-epoxycyclo-octane being specified, together with some quantity of cyclo-octenone, and cyclo-octenol. The epoxide may be converted into the 1 : 2-diol or the benzoic acid - 2 - chlorocyclo - octyl ester.  A residue of one example may be oxidized to suberic acid.
Patent GB-444169-A (GB)
Title: Improvements in or relating to the stripping of dyes from textile materials
IPC: D06P5/13
Filed: 1934-06-12
Abstract: Textile materials dyed with basic, azoic, alizarine and vat dyestuffs are stripped by treatment with an aqueous solution of a quaternary phosphonium or sulphonium salt containing a straight or branched chain of not less than 10 carbon atoms.  The bath may also contain an alkali, or an acid, or a reducing agent such as sodium hydrosulphite or sodium sulphoxylate formaldehyde, or a soluble soap or other detergent, or two or more of these. Suitable stripping agents are: cetyl-trimethylphosphonium bromide; dodecyl-trimethylphosphonium bromide; hexadecyl-triethylphosphonium bromide; cetyldimethyl - sulphonium methyl sulphate; benzylcetyl methylsulphonium methyl sulphate; dodecyl-dimethylsulphonium bromide.  When stripping basic dyes it is usually sufficient to heat in an aqueous liquor containing the phosphonium or sulphonium salt; with azoic, alizarine and vat dyestuffs, a reducing agent and an acid or alkali are necessary, and in the case of vat dyestuffs a soluble soap or other detergent must be used.  There are a number of examples; in some of these, to obtain a white, a final hypochlorite or hydrogen peroxide bath or a soap boil or both of these is employed.  Specifications 398,818, 400,239, 422,466, 422,556, 434,810, and 436,076 are referred to.  Benzyl cetyl methyl sulphonium methyl sulphate is prepared by treating cetyl mercaptan with sodium in methanol and then heating with benzyl chloride.  The resulting cetyl mercaptan is then heated with dimethyl sulphate.  Dodecyl dimethyl sulphonium bromide is made by heating dodecylmethyl sulphide with methyl bromide.  Dodecylmethyl sulphide is prepared by reacting dodecyl mercaptan and dimethyl sulphate in aqueous alkali.  Reference has been directed by the Comptroller to Specification 434,810.
Patent GB-356255-A (GB)
Title: Improvements in or relating to rotary printing
IPC: B41L13/04
Filed: 1930-06-05
Abstract: 356,255. Stencilling ; printing-surfaces. UHER ENGINEERING CO., Ltd., Kubli House, Poststrasse, Glarus, Switzerland. June 5, 1930, No. 17450. Convention date, Jan. 28. [Class 100 (ii).] In a rotary printing process wherein one or more printing-cylinders each consisting of a permeable hollow cylinder capable of resisting compression and distortion are employed with a layer adhering thereto which is perforated to correspond to the particular printed image to be produced, the printing-cylinder receiving the ink or other printing medium from the back of the printing-surface, the ink &c. 1, Figs. 2 and 3, is forced by the internal pressure imparted to it to diffuse uniformly through the printing-cylinder 2 and perforated layer 10 at a rate corresponding to the consumption of the ink &c. applied to the surface to be printed upon and practically without any impression pressure. The cylinder 2, Fig. 2, which may be of baked clay or a permeable metal alloy, is clamped on a hollow shaft 3 by means of an axially displaceable cone 4, a fixed cone 5, and fastening nuts 6. An extension 7 of the cone 4 is fitted with a rubber bush 8 to make a fluidtight joint with the shaft 3. The ink 1 enters the interior of the cylinder through the hollow shaft 3 and a radial hole 9 in the latter- The perforated layer 10 constituting the printing- stencil may be a resin emulsion made sensitive to light by chromate salts and which is developed and afterwards washed to form the stencil when in position on the cylinder. A paper &c. web 12 passes around the cylinder and is guided by rollers 13. The end faces of the cylinder are provided with an impervious coating 11. In the arrangement shown in Fig. 3, a paper &c. web 12 passes around the cylinder 2 and is held against it by means of an endless elastic band 14 engaging over the entire breadth of the printing-surface. The band 14, which may be adjusted by means of an adjustable roller and a screw 16, passes around rollers 13 and is driven with the cylinder and the web 12. The flow of the ink may be regulated by means of internal pressure, and the centrifugal action of the ink inside the cylinder may be throttled by means of a central volume-reducing member 18. Where the web 12 is not in contact with the cylinder the exit of the ink from that portion may be prevented by blowing air over it from nozzles. More than one cylinder may be used when it is desired to print in different colours and on both sides of the web in one operation.
Patent GB-595934-A (GB)
Title: Improvements in or relating to electric attenuating devices
IPC: H01P1/22
Filed: 1945-07-10
Abstract: 595,934. Attenuators. STANDARD TELEPHONES & CABLES, Ltd., and SECKER, B. July 10, 1945, No. 17561. [Class 40 (iii)] An attenuator for very high frequencies comprises a coaxial transmission line 1, 2, whose outer conductor 2 has a helical slot 3 in consequence of which the skin current flows outside and around the conductor. Outside the conductor are one or more tubes 7, 9 made of magnetic material of high permeability, each having a straight longitudinal slot whereby the circumferential currents induced in their inner surfaces bv the currents in the outer surfaces of the enclosed conductors are forced into outer return paths, the final current path being on the inside surfaces of the cylinders 6, 10, which are not slotted. In this way energy is dissipated, the attenuation at any frequency bearing a constant ratio to that of the coaxial line, while the characteristic impedance is substantially that of the line. The attenuation is varied by shifting the assembly longitudinally or by stretching the helical part of the conductor 2. The latter may alternatively comprise helically-wound copper tape. A fixed attenuator with micrometer adjustment, Fig. 6 (not shown) may be used instead of the variable attenuator. The device described may be used as an equalizer in an amplifier having negative feedback.
Patent GB-651771-A (GB)
Title: Improvements in heat exchangers
Inventor: ALCOCK JOHN FORSTER
IPC: F28D19/04
Filed: 1946-06-12
Abstract: 651,771. Thermal regenerators. POWER JETS (RESEARCH & DEVELOPMENT), Ltd. June 12, 1946, No. 17642. Divided out of 636,666. [Class 64(i)] In a rotary regenerator in which, a rotatable heat-absorbing annulus 1, drum or disc transfers heat from turbine gases to compressed air in passages which are separated from one another by a partition 15, 16 which is asymmetrically disposed so that the compressed air flows through the smaller exposed area of the annulus &c. and the turbine gases through the larger' area, the partition or a part 15 thereof is movable automatically in response to a change in at least one operating condition of the regenerator, to vary the ratio of the exposed areas. In the form shown, changes in the pressure difference of the turbine gases and air move a diaphragm 31 which moves an arm 33 over a resistance 34 and so controls the current supply to an electric motor 37 which moves the partition section 15. The ends of the partition may be sealed against the annulus by rollers or by an endless flexible band running on pulleys. A similar endless band may be provided between the casing 8 and the annulus 1.
Patent GB-544752-A (GB)
Title: Improvements in dry gas meters
IPC: G01F3/22
Filed: 1940-12-14
Abstract: 544,752. Gas meters. PARKINSON & COWAN (GAS METERS), Ltd., ROLFE, L. H., and DOUGLAS, R. R. R. Dec. 14, 1940, No. 17687. [Class 54] The diaphragms e are disposed vertically side by side in chambers formed in the lower part of the meter by a partition c. Each diaphragm operates by a flag j a vertical shaft i carrying an arm m coupled by a link u to a block p on an arm 9 of a crankshaft r arranged in the upper part of the meter. A crank s at the lower end of the shaft r carries two rollers t engaging slots in bell-crank levers u. The other ends of the levers u carry adjustable eccentrics v engaging between lugs w on the valves x which are thereby turned about pivots y to admit and exhaust gas supplied to the upper part of the meter by a pipe 9 directly through ports 2 in a valve plate z and to and from the measuring chambers. The exhaust ports 3 in the valve plate lead to a conduit 5 communicating with the outlet pipe 6. The valves 2 may be of the straight slide type 2 instead of the arc or radial type. The body of the meter and its cover b may be moulded in synthetic plastic material or die cast.
Patent GB-1014173-A (GB)
Title: Improvements in or relating to door latches
Inventor: JAMES MICHAEL JOSEPH
IPC: E05B13/00
Filed: 1961-05-16
Abstract: 1,014,173. Latches. MICRO & PRECISION MOULDINGS (CHELTENHAM) Ltd. April 25, 1962 [May 16, 1961], No. 17713/61. Heading E2A. A door latch comprises a shaft 15, a release member 8 bearing projections 10 which in operation engage apertures 12 of the spring loaded bolt 4, is characterized in that the shaft 15 can be axially displaced from one side of the door to a locking position in which rotation of a handle 20 on the opposite side of the door is not prevented but is ineffective to release the latch and is provided with retaining means 32 which retain the shaft in the locking position, such means being movable by the bolt, on releasing movement of the latter, to free the shaft. In use, the shaft 15 is displaced by means of a projection 23 to the locked position where a rounded portion 30 engages the square aperture 26 of a drive plate 27, whereupon the retaining means or detent bolt 32 springs into an arcuate notch 34 of the shaft 15 to lock the shaft in position. Further rotation of the handle 19 forces the shaft 15 from the detent bolt and it returns to its operative position. In a modification Fig. 6 (not shown) one end of the shaft extends through the handle forming a pushbutton. The bolt is formed with a steep bevel 39.