baber/WOPTO huggingface dataset:
Patent GB-1067731-A (GB)
Title: Improvements in or relating to projection systems
IPC: G03B21/20
Filed: 1964-05-19
Abstract: 1,067,731. Optical apparatus. ALOS A. G. May 19, 1964 [May 28, 1963], No. 20498/64. Heading G2J. A projection system comprises a projection screen, an objective and an illuminating apparatus which includes a light source, a condenser and a concave reflector, the reflector having a reflection capability that progressively decreases from the outer periphery to the centre of the reflector in order to provide a uniformly illuminated screen. As shown in Fig. 3, the reflector comprises a part spherical glass base 30 provided with a reflecting coating 31 on the convex rear face and, at the centre of its concave surface, with two layers 32, 33 of light absorbing material, each layer having a thickness which decreases from the centre of the reflector. The variation in reflection capability may be provided by a reflecting coating of a thickness which decreases towards the centre or by a reflective metal coating which is matted or dulled towards the centre of the reflector.
Patent GB-391343-A (GB)
Title: Improvements in and relating to apparatus for use in cleaning footwear
IPC: A47L23/18
Filed: 1932-07-21
Abstract: 391,343. Boot trees. COOK, N., 18, Exchange Street, Manchester. July 21, 1932, No. 20576. [Class 17 (iii).] Boot-cleaning apparatus comprises a wall bracket 4 with a pivoted arm 7 which can be swung parallel with the wall or be fixed at right-angles by a wing nut 10. The arm 7 carries a leg piece 12 and a pivoted lever 14 which can be locked by a ratchet and pawl 17. The leg piece 12 carries a heel piece 18 and two rods 19 to support various sized toe pieces 21. The lower end of the lever 14 ends in a ball member 20 which contacts with a member 22 attachable to the toe pieces.
Patent GB-437260-A (GB)
Title: Improvements in or relating to cigarette cases or containers
IPC: A24F15/12
Filed: 1935-07-19
Abstract: 437,260. Cigarette cases. ROGERS, A., 22, Ryder Street, St. James's, Westminster. July 19, 1935, No. 20595. Addition to 408,511. [Class 18] A cigarette case described in the parent Specification is made of such a diameter that it will hold five or more cigarettes arranged in cylindrical formation.
Patent GB-1361384-A (GB)
Title: Electrical arrangements for establishing electrical connection  between a source and one of a plurality of remote units
IPC: H04M11/02
Filed: 1971-07-27
Abstract: 1361384 Selective signalling R TOWN 27 July 1971 [29 April 1970] 20606/70 Heading G4H [Also in Division H4] In a system for enabling a caller at an apart. ment block to signal and to speak to any one of the apartments so that the latter may then unlock the main door to the block, the signal/  speak units in the apartments are arranged in a co-ordinate array and the row wires for adjacent rows are connected via opposite polarity diodes to a single row select wire so that either row may be selected dependent on the polarity of the voltage connected to the select wire. Selection of an apartment is effected by setting rotary switches 18, 19, 20 to the number of the apartment required (visual displays 18<SP>1</SP>, 19<SP>1</SP>, 20<SP>1</SP> depict the number selected) and then the apartment is called by pressing button 25. This causes a mains derived D.C. voltage of +12 or - 12 volts, in accordance with the rotary switch settings, to be applied to the row select wire pertaining to the required row and an adjacent row whereby due to rectifier 63 or 62 &c., the voltage is applied to the particular row. A return path via the particular column wire is obtained also by virtue of the rotary switch settings. A low frequency interrupted calling tone is superimposed on the row select wire from oscillator 27 via amplifier 28 and transformer 29. A speech connection is provided over the same wires from microphone 33 and loudspeaker 35 when button 25 is restored, contacts 24 remaining closed for a timed period for this purpose. The apartment responds by directly looping his row and column wires so causing a D.C. surge to bring up relay 17 and thereby release electromagnetic lock 14. Each apartment is directly connected to a high frequency interrupted calling tone from generator 27 via wires 38 and 39, a simple push button on the apartment door being operable to cause this distinctive tone to be applied to the apartment's signal/speech unit. In the event of fire, lock 14 may be released automatically by a detector 8. It may also be released via relay 17 by means of an electronic key applied to detector 36.
Patent GB-315311-A (GB)
Title: Improved apparatus for burning pulverised fuel and for extracting the heat therefrom
IPC: F23M5/08
Filed: 1929-07-05
Abstract: 315,311. Garreau, H. July 11, 1928, [Convention date]. Void [Published under Sect. 91 of the Acts]. Pulverulent. - fuel furnaces. - A mixture of pulverized coal and air is burnt in the interstices of a mass of loose material which may be refractory or combustible and arranged in a combustion chamber of any suitable shape so that the heat may be applied in any desired manner. The loose material may be regular or irregular in form and may be composed of carborundum, fused alumina, zirconium or the like or may consist of the substances under treatment, such as chalk or other minerals or castings to be melted, or combustible substances. A suitable form of combustion chamber is shown in Fig. 1 in which the material 2 is first heated by any means to the ignition temperature of the powdered fuel which is afterwards supplied with air through the openings 3, 4, into the spaces between the mass of material 2. The combustion products escape through the passage 5 and ashes are removed at 7. A cover 6 allows for the introduction and withdrawal of the material. The ashes may escape from the chamber from the same outlet as the gases which mav be at the bottom of the chamber. Fig. 7 shows a steam boiler heated in the manner described above by a combustion chamber 11 which may be fixed or removable. The loose material is contained in the chamber 11 and the ashes and combustion products escape at 14. The invention is also applicable to crucible furnaces, the crucible being supported in the bed of loose material.
Patent GB-187357-A (GB)
Title: Improved ventilator for closed vehicles
IPC: B61D27/00
Filed: 1921-08-04
Abstract: 187,357. Martin, A. Aug. 4, 1921. Ventilating vehicles.-Means for ventilating closed vehicles is shown applied to a railway carriage and comprises a longitudinal air flue A located near the roof and provided at each end with a bell mouth B fitted with a non-return valve as shown in Fig. 3. The flue A communicates with each compartment of the carriage through outlets C adjustable by means of the sliding shutter arrangement shown in Fig. 5. Two pipes may be fitted to each carriage and the outlets C arranged over the doorways.
Patent GB-506235-A (GB)
Title: Improvements in and relating to cassettes for cinematographic cameras
IPC: G03B17/26
Filed: 1938-07-13
Abstract: 506,235. Kinematograph-apparatus. GEVAERT PHOTO-PRODUCTEN N. V. July 13, 1938, No. 20761. Convention date, Aug. 27, 1937. [Class 97 (i)] Film holders, each comprising a single chamber, have projecting connecting elements on a section of a peripheral wall and a like number of recessed con necting elements thereon, the elements being so positioned that two film holders may be connected together with the axes of the centring sleeves for the coiled film spaced apart and parallel. As shown in the Figure, a single-chamber film holder c, having a centring sleeve a and a film slot b, is provided on one face of the peripheral wall with pins e, e<1> symmetrically arranged, with respect t6 a plane perpendicular to the axis of the sleeve a and containing the horizontal centre line of the face, with sleeves or sockets g, g<1> capable of being engaged by such pins. The film holder may be connected to another similar holder by inverting one of them and bringing the pins and sockets into engagement. In one modification, a dovetailed slot and a dovetailed rib are provided in positions symmetrical about the plane through the horizontal centre line, and, in another modification, pins and sookets are respectively provided in positions symmetrical about a plane containing the axis of the sleeve and the vertical centre line of the face, the covers of the holders being similarly directed when the holders are connected.
Patent GB-275661-A (GB)
Title: Improvements in and relating to cameras
IPC: G03B37/04
Filed: 1927-08-08
Abstract: 275,661. Aerofoto Akt.-Ges. Aug. 7, 1926, [Convention date]. Kinematograph apparatus.-Shutters for kinematograph cameras for use in aerial surveying &c., and comprising coaxially arranged discs rotated at different speeds, are connected with the film-feeding means through a change speed gear so that the time intervals between exposures may be varied. As shown, the shutter comprises apertured discs e, f carried by a shaft c and driven at different speeds in the same or opposite directions. A disc A, loose on the shaft c, is connected to the disc e by means of a pawl connection y while the film is in motion, the connection being broken by a sliding rod z when the film is stationary, and an aperture in the disc A being then opposite the lens. The film w is fed by a disc or drum v having in its circumference a gap v<1> which determines the stationary periods in the film feed. The shaft u, carrying the drum v, also carries a cam x which rocks a lever z<3> to move the rod z, and is driven from a shaft a through change-speed gearing comprising pairs of wheels g, h, g<1>, h<1>, the two pairs of wheels having different gear ratios. The wheels h, h<1> are slidable on the shaft i so as to be alternatively connected therewith by feathers h<2>, h<3>, and are moved by levers k, k<1> under the control of springs p, p<1> and cams s, s<1> on a driven shaft r.
Patent GB-1000052-A (GB)
Title: Improvements in or relating to magneto-hydrodynamic generators
IPC: H02K44/08
Filed: 1963-05-24
Abstract: 1,000,052. Generators operating by electromagnetic interaction with fluids. WESTING- HOUSE ELECTRIC CORPORATION. May 24, 1963 [July 13, 1962], No. 20889/63. Heading H2A. In order to keep the working fluid of a magnetohydrodynamic generator at high temperature and therefore fully ionized additional heat is added to it continuously during its passage through the working part of the duct. Fuel and oxygen are burned in combustion chamber 14, where seeding material is also added, and passed along duct 10 between electrode pairs 2, 3, 5, 7. Additional oxygen and/or fuel is added from injectors 32, 34 spaced along the duct to keep the temperature reasonably uniform. Alternatively a fuel having a slow combustion rate could be used thus obviating the need for the injected supply. The seeding material is recovered from the exhaust gas by normal washing or precipitation means and returned to the combustion chamber. Reference has been directed by the Comptroller to Specification 926,498.
Patent GB-1267906-A (GB)
Title: Signal overload compensation circuit for antenna tuning system
Inventor: BYLES THEODORE AVERILL
IPC: H03H2/00
Filed: 1970-04-30
Abstract: 1,267,906. Tuning radio receivers; A.G.C. in transistor circuits. MOTOROLA Inc. 30 April, 1970 [15 May, 1969], No. 20913/70. Headings H3T and H3Q. In a wave signal receiver having a voltage variable reactance 41 in series between the antenna 9 and an R.F. amplifier 12, a signal level overload compensation circuit for the voltage variable reactance has a voltagevariable resistive impedance 60 and/or 12 (Fig. 2, not shown), connected in the input circuit of the R.F. amplifier 12 and a control voltage derived from the output of the R.F. amplifier is used for varying the impedance of the variable impedance 60, so that its impedance variation causes corresponding variations in the signal level of the wave signals applied across the voltage variable reactance 41. The R.F. amplifier 12 includes a hyper-abrupt varactor diode 16 as may the oscillator 26 for turning together with the hyper-abrupt diode 41 by adjustment of the potentiometer 20, which may be in the receiver or remotely located. Capacitances 48 and 49 represent the antenna and cabling capacitances and capacitor 50 may be provided to tune the radio to the A.M. band. The input circuit to the R.F. amplifier 12 includes a series tuned L-C circuit 40, 41 and when the radio is used in a car a whip antenna 9 may be used. A high level input signal causes the A.G.C. voltage to make transistor 60 less conductive so that it increases the A.C. impedance in the input circuit. This reduces the A.C. gain of the R.F. stage 12 and more of the signal voltage occurs across the impedance presented by the transistor 60 so as to limit the voltage across the diode 41 to a value to prevent it acting as a rectifier to produce a D.C. detuning voltage. This arrangement does not affect the D.C. bias to transistor 12 and the bandwidth is maintained constant over the tuning range. In a modification (Fig. 2, not shown), using an opposite conductivity type transistor (60<SP>1</SP>) in place of transistor 60 with its emitter and collector connections interchanged, the A.G.C. voltage is applied to the base of the R.F. transistor 12. When a high level input signal is received the A.G.C. voltage increases to decrease the conductivity of transistor 12 which result in a reduced collector voltage of transistor 12. This gives an amplified A.G.C. voltage to the transistor (60<SP>1</SP>) from the collector circuit of transistor 12 which reduces the conductivity of transistor (60<SP>1</SP>) so that both the base-emitter path of transistor 12 and the collector-emitter path of transistor (60<SP>1</SP>) provide the increased impedance for compensation of the signal overload.
Patent GB-1511763-A (GB)
Title: Acceleration-insensitive hydrophone
IPC: B06B1/06
Filed: 1976-05-20
Abstract: 1511763 Hydrophones; piezoelectric transducers BENDIX CORP 20 May 1976 [6 June 1975] 20957/76 Heading H4J A hydrophone, for compensating acceleration effects, comprises a cylindrical housing 10 divided into two chambers 14, 16 by a bulkhead 12, identical ceramic piezoelectric elements 32, 34 physically and electrically bonded to the bulkhead 12 and metal end cap members 36, 38 connected to the outer ends of the piezoelectric elements 32, 34. O-rings 44, 46 in grooves 40, 42 of the end cap members 36, 38 provide liquid-tight seals and insulated annular areas 50, 52 insulate the end cap members 36, 38 from housing 10. A wire 22, providing a first output is supported by a post 20 and is electrically connected to the housing 10, the bulkhead 12 and adjacent ends of the piezoelectric elements 32, 34. A wire 30, insulated from the housing 10 by a grommet 26 provides a second output, of opposite polarity to the first output, and is connected to end cap 38 by a light wire 54; end caps 36 and 38 are interconnected by a wire 56. In a modification (Fig. 2, not shown) a pair of piezoelectric elements connected in parallel are used in each chamber and the outer ends of the outer piezoelectric elements are insulated from the respective end caps. The second output is connected only to one of the end caps.
Patent GB-614572-A (GB)
Title: Improvements in arrangements for secret telephony
IPC: H04K1/04
Filed: 1946-07-12
Abstract: 614,572. Scrambling. SOC. FRANCAISE RADIO-ELECTRIQUE. July 12, 1946, No. 20963. Convention date, May 8, 1944. Drawings to Specification. [Class 40 (iv)] [Also in Group XL (b)] In a scrambling system for a simplex or multiplex system an intermediate frequency band comprising frequencies representing the aggregate of all the spaced bands is moved bodily up and down in the frequency spectrum either continuously or in irregular jumps, prior to single side-band transmission on a radio carrier. The system is described with reference to a system having two channels of frequency range 0.25-3 kc, the second channel being first inverted with respect to 5.25 kc. The respective channels then modulate a 100 kc. carrier, the lower side band being taken for the first channel and the upper side band for the second channel. The aggregate is superimposed on a varying intermediate carrier of 899Œ0.5 kc. and the upper side band taken to modulate the radio carrier. An unvarying pilot frequency of 1000 kc. is also transmitted. The carrier frequencies and side bands may be seen to be so chosen that the bands representing the two channels do not at any stage clash with the 1000 kc. pilot tone. The intermediate carrier variations may be carried out continuously throughout the range Œ0.5 kc. or may consist of abrupt jumps between fixed frequencies in that range. These frequencies may be generated from quartz crystal oscillators having corresponding frequencies in the range 99Œ0.5 kc. which modulate an 800 kc. frequency derived from an oscillator excited by the 100 kc. oscillator mentioned above, this last being also crystal controlled. Successive selection of the intermediate frequencies may be effected by a distributer comprising a series of optical screens which cover or uncover a number of luminous beams which act on photo-electric cells to control amplifying stages following each of the frequency sources. The order in which the frequencies are used may be varied periodically by feeding the oscillators to the input terminals of a socket whose output terminals are connected to the distributer, various plugs being provided each incorporating different cross-connections between its input and output pins. The plug and socket arrangements may be replaced by a multi-contact switch each position of which corresponds to a different frequency sequence. Synchronizing signals for the distributers at sending and receiving stations may consist of short breaks in the 1000 kc. pilot tone. Alternatively, the intermediate frequency to be used may be signalled to the receiving station by the selection and transmission of one of a set of predetermined frequencies outside the speech bands. In a multi-channel embodiment one of the channels is omitted and the pilot and control frequencies occupy a 2 kc. band therein, the remainder of the channel band being used to accommodate parts of the neighbouring channels as their position varies in the frequency spectrum.
Patent GB-1287166-A (GB)
Title: Stabilizer system for asbestos-filled polypropylene
IPC: C08K3/06
Filed: 1970-05-01
Abstract: 1287166 Stabilizing polypropylene compositions ARGUS CHEMICAL CORP 1 May 1970 [16 May 1969] 21037/70 Heading C3P Asbestos-filled polypropylene compositions are stabilized with a stabilizer comprising (1) a polycyclic phenol having two phenolic nuclei linked by a substituted or unsubstituted aromatic phenolic hydrocarbon group or by O, CO, S, SO, SO 2  or an aliphatic, cycloaliphatic, aromatic, thiohydrocarbon, oxyhydrocarbon or heterocyclic group having at least two atoms in the linking chain and (2) sulphur in a ratio of 1 : 1 to 15 : 1. The polymer may be a homopolymer or copolymer of propylene with amino or proportion of ethylene, butene or pentene, or a mixture of such a polymer with a minor proportion of polyethylene, polybutene, polybutadiene or polyisoprene. The asbestos is preferably anthophyllite. Carbon black may also be present as light stabilizer. Many suitable phenols are listed and examples describe compositions comprising polypropylene, asbestos, sulphur and (I to III) di(di.cyclopentadiene)tri(2-t.butyl.4-me thyl phenol), (IV) 4,4<SP>1</SP>-thio bis-(2-t.butyl-5- methyl phenol, and (V and VI) pentaerythrityl tetra(4-hydroxy-3,5-di-t.butyl phenyl propionate).
Patent GB-1369924-A (GB)
Title: Rotary device for setting a spindle of a machine tool
IPC: B23B29/03
Filed: 1972-05-05
Abstract: 1369924 Indicating devices INDEX-WERKE KG HAHN & TESSKY 5 May 1972 [7 May 1971] 21156/72 Heading B3B  A rotary setting device for indicating adjustment produced by a spindle in a machine tool comprises a housing 14 securable to the machine tool, a rotary adjusting member 24 carrying a scale 25 and which is supported in the housing for rotation relative thereto about a first axis, an annular scale member 48 located coaxially on the member 24 for rotation relative thereto and adjacent a datum ring 46 the scale member 48 being located between the datum ring 46 and the housing 14. Adjacent the scale portion 25 of the member 24 is provided an eccentric boss 44 on which is rotatably mounted about a second axis, parallel to the first, an annular gear 66 which is adapted to engage with internal teeth 62, 64 and 22 on the datum ring 46 scale member 48 and flange 20 on the housing 14, respectively. The gearing ratio between these components is so selected whereby with rotation of the adjusting member 24, the datum ring remains stationary relative to the housing 14 and the scale member 48 is rotated by way of the gear 66 through a given larger angle than that of the adjusting member, the adjusting member and scale ring each having a scale indicating fine and coarse adjustment respectively. The scales may be in either metric or English units.
Patent GB-478892-A (GB)
Title: Improvements in and relating to mowing machines
IPC: A01D65/06
Filed: 1936-07-31
Abstract: 478,892. Mowing-machines. ELDEVIK, S. July 31, 1936, No. 21266. [Class 6 (iii)] The wheel 6 situated in front of and secured to the shoe 4 of a mowing- machine is provided on its periphery with spikes 7. The wheel, which is slightly dished, is mounted on an axle 8 which is bent at right-angles and secured to a bracket projecting upwards from the shoe.
Patent GB-173800-A (GB)
Title: Improvements in or relating to electric transformers
IPC: H01F27/30
Filed: 1920-07-14
Abstract: 173,800. British Electric Transformer Co., Ltd., and Roothaan, J. July 14, 1920. Transformers.-Clamping-means are provided at each end of a transformer winding and are interconnected so that compression of the winding takes place simultaneously from opposite ends. In the arrangement shown, the winding a is compressed between rings e, f by means of hollow bolts h, i rotatably mounted in stationary units j, k. Each bolt is provided with an operating- spindle w having a pin u which extends into a slot t in the bolt. A tube v extends from each bolt to the corresponding bolt at the opposite end of the winding, so that both bolts are moved simultaneously in opposite directions by operating one of the spindles w. The heads of the bolts may be separate from the shanks, and springs may be placed between the heads and shanks. In a modification, springs are placed between the heads of the bolts and the clamping-rings to take up any further shrinkage of the winding, and locking- arms are provided to prevent reverse movements of the rings or winding under the action of disruptive forces. The screw-threads in the bolts may be of unequal pitch on opposite sides of the winding in order to cause one of the clamping- rings to move to a greater extent than the other.
Patent GB-139420-A (GB)
Title: Improvements in or relating to tobacco and like pipes
IPC: A24F7/02
Filed: 1919-08-29
Abstract: 139,420. Ropp, E. Aug. 29, 1919. 'Tobacco pipes.-A washer 1 is formed with a plain or corrugated projecting ring or teeth 4 adapted to. enter an annular groove or recesses in the stem 2, and retains the cork packing-ring 5 in place. The inner part of the washer may be plain as shown in Fig. 4, or countersunk as shown in Figs. 5 and 6..