baber/WOPTO huggingface dataset:
Patent GB-1082388-A (GB)
Title: Arrangement for controlling the brightness of lamps
IPC: H05B39/08
Filed: 1964-12-09
Abstract: 1,082,388. Automatic voltage control systems. SIEMENS A. G. Dec. 9, 1964 [Dec. 9, 1963], No. 50203/64. Heading G3R. [Also in Division H2] A retroactive dimming circuit for a bank of lamps B comprises a pair of reverse parallel connected thyristors V1, V2 controlled by a D. C. signal applied to either or both of terminals 5, 6 which allows the conduction of a transistor P1 forming with resistor r9 a potentiometer across a D.C. supply N, MP. The lamp voltage is sampled by a transformer M, rectified and applied through a Zener diode in opposition to the signal so that the feedback is non-effective below a determined value, say 50% of the lamp voltage. Chokes L1, L2, on a common core may provide smoothing and a capacitor C may be provided to protect the thyristors. To limit current surges due to switching cold lamps a further choke Br arranged across the diagonal of a rectifier bridge or a centre tapped choke and pair of rectifiers may be provided. A thermal overload cut-out U may be included in the circuit.
Patent GB-1298076-A (GB)
Title: Improvements relating to electrical switches
Inventor: DEAN JAMES
IPC: H03K3/013
Filed: 1969-10-15
Abstract: 1298076 Non-contact-making switches FERRANTI Ltd 9 Oct 1970 [15 Oct 1969] 50618/69 Heading H3B A switch which produces a pulse in an output circuit 22, Fig. 1, when a push-button 14 is depressed, comprises an intially-biased leaf spring 17 on which is mounted a piezo-resistive or piezo-electric transducer 20 adjacent to a clamped end of the spring. A stop 15 on the push button maintains the bias on the spring. The piezo-resistive transducer may be in the form of a resistance bridge 23<SP>1</SP>, 23<SP>11</SP>, Fig. 2, connected to a supply through leads 21, the resistors of the bridge each being defined by a P-N junction within an epitaxial layer of a silicon water substrate of P-type conductivity. The opposing active piezo-resistive resistors 23<SP>1</SP> extend along the leafspring, and at right angles to an inactive resistor 23 arranged to compensate for temperature fluctuations. The bridge output applied through an amplifier 24 to a monostable device 25, bothy components being formed in a passivating layer on the epitaxial layer of the wafer substrate. The wafer is alloyed to the leaf spring and is encapsulated by epoxy resin or other potting compound. Alternatively the device 25 may be bi-stable.
Patent GB-1205320-A (GB)
Title: Improvements in or relating to the production of semiconductor devices
IPC: H01L21/762
Filed: 1968-10-25
Abstract: 1,205,320. Semi-conductor devices. NIPPON TELEGRAPH & TELEPHONE PUBLIC CORP. 25 Oct., 1968 [28 Oct., 1967], No. 50752/68. Heading H1K. A method of producing a mesa type semiconductor element structure, wherein the sides of the mesa are covered with an insulating layer, comprises forming on that part of the surface of the semi-conductor element where the mesa is required a layer 3 of nitride and then oxidizing the remainder of the surface of the element to a depth H such that after the nitride layer 3 is removed to expose the semi-conductor surface the oxide layer 4 still remains over the rest of the surface to leave a mesa of height h whose side walls are protected by the oxide. A PN junction can then be formed in this mesa and a metal contact deposited on its top surface. The semi-conductor material may be silicon, germanium or gallium arsenide, and the nitride layer may be silicon nitride or tantalum nitride. In a further embodiment of the method, where accurately formed hollows are required in a silicon crystal surface, a silicon nitride mask is applied on the surface and apertures formed where the hollows are required. The silicon is then oxidized over these exposed regions into the crystal and then selectively removed to leave the required hollows. The nitride layers are grown from gases and the oxide layers by oxidation, and both are removed by etching processes. The method may be applied in the production of diodes, or transistors of the planar type
Patent GB-1350919-A (GB)
Title: Microwave heating apparatus
IPC: H05B6/66
Filed: 1970-10-26
Abstract: 1350919 Supply systems for microwave ovens C E M TIBBS and O A VILE 15 Oct 1971 [26 Oct 1970 5 Jan 1971] 50814/70 and 499/71 Heading H2H A microwave oven powered by a magnetron has a gas-filled tube, or a probe connected to an electrode of the tube, projecting into it, which tube ionizes and cuts off the magnetron power supply if the field intensity becomes excessive, e.g. due to absence of load in the cavity, activation of the tube being prevented during an initial period after energizing of the oven. As shown, a multielectrode tube 20 has anode 1 and cathode 4 supplied with a D.C. potential via diode 15, and a primer electrode 23 connected at the junction of resistor 18 and capacitor 19 and supplied with the D.C. voltage via resistor 18. A probe 24 is connected to a trigger electrode 8 which causes ionization of the tube at large field strengths which in turn activates a relay coil 11 to open contacts (9), (9<SP>1</SP>), Fig. 1 (not shown), in the magnetron power supply and the contact 9<SP>11</SP> in the control circuit. The threshold may be adjusted by altering the amount of the probe projecting into the cavity. The tube 20 and associated components are shielded in a can 29 with the probe projecting therefrom through the roof of the oven. In a modification, Fig. 5 (not shown), the tube 20 itself is arranged to project at an adjustable distance from the roof of the oven. To prevent energization of the tube owing to surge effects immediately after activation of the oven the potential on the primer electrode 6 is caused to rise slowly by the R, C circuit 18, 19 so that the tube may not be ignited during, e.g. the first ¢ [second of energization of the magnetron. In a modification, Fig. 6 (not shown), a 2 electrode tube is used, the probe being coupled with one electrode and the activation of the tube being initially prevented either by a delay in switching on of the control circuit after the magnetron is energized, or by a thermistor circuit adapted to increase the electrode voltage slowly as the temperature rises. The tube may also form one arm of a Wheatstone Bridge circuit.
Patent GB-1448374-A (GB)
Title: Condensation resins based on phenol-aldehyde resins
IPC: D06M15/41
Filed: 1973-11-06
Abstract: 1448374 Novolak resins HOECHST AG 6 Nov 1973 [7 Nov 1972] 51400/73 Headings C3R and C3B [Also in Division C2] A novolak resin is prepared by reacting simultaneously a phenol, an aldehyde and an olefinically unsaturated aromatic component selected from olefinically unsaturated aromatic hydrocarbons and alpha-chlorostyrene in the presence of an acid catalyst, water being continually removed from the reaction mixture. The phenol-aldehyde molar ratio is preferably from 1 : 0À5 to 1 : 1 and the phenol/aromatic component molar ratio is preferably from 1 : 0À1 to 1 : (3-2n) where n is the number of mols. of aldehyde per mol. of phenol. Suitable phenols are phenol, cresols, xylenols having 2 hydrogen atoms in the o- and/or p-positions to the OH group, butylphenols, naphthols, resorcinol, diphenylolmethane and diphenylolpropane. Suitable aldehydes are formaldehyde, paraformaldehyde, trioxan, acetaldehyde, propionaldehyde, .butyraldehyde, isobutyraldehyde and benzaldehyde. Suitable aromatic compounds are styrene, alpha- or beta-methylstyrene, vinyltoluene, divinylbenzene, indene and alpha-chlorostyrene. The reaction may be performed in an organic solvent and the water formed during the reaction is preferably continually distilled off and the solvent recycled into the reaction mixture. Suitable acid catalysts are strong protonic acids such as H 2 SO 4 , HCl, H 3 PO 4 , an aromatic sulphonic acid or a hydroxy sulphonic acid, and Lewis acids such as AlCl 3 , ZnCl 2 , SnCl 4 , and the etherates and acetates of boron trifluoride. The novolak produced may be modified by reaction with epichlorohydrin in the presence of an alkali to yield an epoxy resin, or by reaction with an alkylene oxide to yield a diol. In the examples, novolaks are prepared (1) by first heating phenol with H 2 SO 4  and then reacting with vinyltoluene and either trioxan or aqueous HCHO; (2) by first heating phenol with aqueous phenolsulphonic acid, followed by reaction with aqueous HCHO, followed by dehydration, and then reacting the modified phenol with trioxan and styrene; (3) by first heating phenol with H 2 SO 4  and then reacting with styrene and trioxan. Toluene or xylene are used as solvents. Resin (3) is further reacted with epichlorohydrin in the presence of NaOH to produce an epoxy resin or with propylene oxide in the presence of NaOH.
Patent GB-1180773-A (GB)
Title: Tuning Arrangement for an Electric Oscillator
IPC: H03B9/10
Filed: 1967-11-14
Abstract: 1,180,773. Adjusting tuning element; automatic frequency control systems; modulator systems. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 14 Nov., 1967 [17 Nov., 1966], No. 51756/67. Headings H3A, H3Q, H3R and H4L. In a tuning arrangement for an oscillator providing a predetermined fixed frequency comprising a rotor 2 rotatably supported in a stator portion and driven by a reversible motor 1, the rotor is rotated in a certain direction to continuously vary the tuning frequency of the oscillator and an arrestor arrangement is provided which is rendered ineffective when the tuning body is rotated to provide the continuously varying tuning frequency but which functions when the rotor is rotated in the opposite direction by the motor so as to arrest the rotor in a position which corresponds to the predetermined oscillator frequency. The rotor shaft 2 of the motor 1 of a tunable magnetron, is attached to a disc 3 such that when the disc is rotated clockwise, the tuning of the magnetron is continuously varied and a catch lever 7 is moved by springs 14, 15, which are in frictional contact with the disc 3, against a stop 12. If the direction of the motor is reversed the disc 3 moves anticlockwise until the lever 7 moves against a projection 4 and the tuning of the magnetron is then fixed. The pre-set frequency may be varied by rotating a shaft 18 and screw 16 which meshes with teeth or a rack 17 on the ring 9, on which the catch lever 7 is mounted. The locking and adjusting arrangements are protected by a lid 23 which is hermetically connected to the arrangement. The motor may be of two-phase type connected to provide forward and reverse under control of a switch (27, Fig. 3, not shown). Automatic frequency control (Fig. 4).-The output from the magnetron is passed to the aerial via a waveguide 28 which is coupled via a directional coupler 29 to a further waveguide 30. Two cavity resonators 31, 32 tuned to different frequencies are coupled to the waveguide 30 and feed detectors 35, 36 which give outputs in opposite directions. The outputs from the detectors are added in an amplifier 37 which gives an output error voltage. This is fed via a peak rectifier 39 to control a servomotor 40 which is coupled to the shaft 18 of the tuning arrangement so as to maintain the predetermined frequency half way between the frequencies (f 1 , f 2 , Fig. 5, not shown), of the cavity resonators 31, 32. An attenuator 38 may be provided so that the output voltage from the detectors can be adjusted to be equal.
Patent GB-1113860-A (GB)
Title: Sustained release composition
IPC: A61K9/22
Filed: 1965-12-09
Abstract: Oral sustained release pharmaceutical forms comprise a pharmaceutically active agent dispersed in a solid matrix of a lipid which is solid at room temperature and silica having a particle size not exceeding 0.1 mm., preferably colloidal silica. Preferred lipids are cetyl or stearyl alcohol; palmitic or stearic acid; 12-hydroxy stearic acid; or hydrogenated castor - or cocoanut - oil, or may be higher esters, or mineral, vegetable or animal waxes.  The silica may be colloidal pyrogenic silica.  The compositions are prepared by melting the lipid or softening it with volatile organic solvent e.g. npropanol, adding the silica to yield a gel, dispersing the finely divided drug into the gel, congealing the latter by cooling or removing the solvent, and then grinding the composition to granules and compressing them into tablets.  The tablets may be coated with a soluble rapid release composition of a drug by conventional coating procedures.  The rate of release of drug from the sustained release composition may be regulated by inclusion therein of water-soluble substances, such as salts, glycine, urea and polyethylene glycol, or else water-soluble gums or insoluble hydrophilic fillers, to increase the rate of release, or lipid-soluble water-insoluble polymers such as ethyl cellulose, to decrease release rate.  Also the drug itself may be used in suitably modified form to achieve such effects. Examples are given for sustained release forms, which may be coated, containing methamphetamine and phenobarbital, brompheniramine maleate; hyoscine, atropine and hyoscyamine; phenylephrine, phenyl propanolamine and chlorpheniramine; quinidine; and glycopyrrolate with phenobarbital and phenobarbital sodium.  Many other drugs are listed by name.
Patent GB-1526779-A (GB)
Title: Impact impulse measuring devices
IPC: G01R19/17
Filed: 1975-12-22
Abstract: 1526779 Measuring peak values N-I INST INTROSKOPII 22 Dec 1975 [24 Dec 1974] 52431/75 Heading G1U A digital peak value measuring system can operate selectively in two modes: (a) a "single pulse" mode in which the peak value of that pulse that first occurs after the depression of a key is measured and transferred to an output register; and (b) a "multiple pulse" mode in which as successive pulses reach the system their peaks are measured and sequentially transferred to the output register. The peak measuring circuit of the type in which clockpulses are counted to produce a rising analogue voltage which is made to follow all rises (but not falls) in an input signal. According to the invention, this circuit is accompanied by a pulse detecting circuit which, by comparing the input signal with a zero level, produces a signal when a pulse is present. In the first mode of operation, depression of a key readies the circuit to respond to the next pulse received. This pulse then has its peak measured in the usual way, and at the end of the pulse a transcribe pulse is produced which transfers the measurement to the output register where it remains indefinitely. In the second mode of operation the first pulse to arrive is treated as just described. However, the transcribe pulse also resets the peak measuring circuit so that it is ready for the next pulse, and this process repeats indefinitely.
Patent GB-1364887-A (GB)
Title: Method for the optical recognition of a character
IPC: G06V10/10
Filed: 1971-11-12
Abstract: 1364887 Character recognition systems TURLABOR AG 12 Nov 1971 [13 Nov 1970] 52741/71 Heading G4R In a system in which a character to be recognized is regarded as lying within a field comprising a matrix of n x m cells, each cell is inspected at, for example, four positions. Corresponding positions from the n x m cells are regarded as forming the cells of four n Î m matrices spaced relative to one another. Each such matrix is then compared with reference character matrices. As described the matrix has 9 x 5 cells. The character is scanned by a column of 18 photodiodes, there being two diodes vertically spaced in each row of the raster scan matrix. The 18 diodes are enabled sequentially twice in the time taken for the diodes to scan one column of cells, so effectively scanning each cell in 4 positions. Fig. 5 shows a thin character superimposed on a 9 x 5 matrix in which each cell is divided into 4 positions. The top left position in each cell is regarded as forming one cell of a first 9 Î 5 matrix, this matrix Fig. 5A, containing no character portions for the character shown in Fig. 5. The top right positions provide a second matrix, Fig. 5B, the bottom left positions a third matrix, Fig. 5C, and the bottom right positions a fourth matrix, Fig. 5D. By comparing the 4 matrices bit by bit with the reference characters the unknown character can be identified. The subdivision of the scan matrix into 4 relatively displaced matrices ensures the recognition of the character should it be off centre or have stroke elements differing from the nominal of one scan cell width. Also, since the derived matrices have only 9 Î 5 cells the reference character stores need accommodate only 9 Î 5 bits each, rather than 18 Î 10.
Patent GB-1141780-A (GB)
Title: Electrical delay device
Inventor: WADSWORTH DAVID FREDERICK
IPC: H03K17/28
Filed: 1966-11-24
Abstract: 1,141,780. Transistor oscillator and time delay circuits. ERICSSON TELEPHONES Ltd. 31 Aug., 1967 [24 Nov., 1966], No. 52753/66. Heading H3T. The end of the delay period in a time delay circuit is detected by rendering conducting a diode in the transformer feedback path of a transistor so that the transistor oscillates. In the normal condition of the circuit shown a start contact S maintains a capacitor C1 charged and applies a bias through D4 to the emitter of VT1 to maintain it non-conducting. If S1 is now opened the left-hand plate of C1 falls to earth potential bringing the right-hand plate below earth potential by the value of the supply. These changes remove the bias from the transistor, allowing it to conduct, and cut off diode D1. C1 charges through R1 until its potential is such that D 1 conducts to complete a regenerative feedback path between collector and base of the transistor through transformer T1, T2. The transistor oscillates and its rectified output operates a relay E. Contact E2 provides a diode bias independent of the timing resistor R1 but a charge accumulates on C1 which eventually cuts off diode D1 and stops oscillation. E2 now opens and the charge leaks away until the diode again conducts and oscillation restarts. Thus successive operations of the relay take place until contact S is reopened.
Patent GB-1597346-A (GB)
Title: Accessory to be fixed onto a rear-view mirror
IPC: B60R1/08
Filed: 1977-12-19
Abstract: The attachment is composed of a wedge-shaped mirror piece (2) having a level base surface (14) which can be mounted onto the level viewing surface of the rear view mirror (1) and having a mirror surface (15) which is inclined towards the latter surface. Furthermore, means are provided for fastening the mirror piece (2) on the surface of the rear view mirror. <IMAGE>
Patent GB-1198576-A (GB)
Title: An Improvement in Perforation Machines.
IPC: B26F1/20
Filed: 1968-11-07
Abstract: 1,198,576. Perforating webs. LILLA EDETS PAPERSBRUKS A.B. 7 Nov., 1968 [9 Nov., 1967], No. 52850/68. Heading B4B. A machine for transversely perforating webs e.g. of paper has a roller 2 bearing at least one longitudinal knife 5 co-operating with abutment means comprising a longitudinal support 12 having transversely spaced abutment surfaces resiliently urged into the path of the knives 5. As shown, the abutment surfaces are provided by glass plates 13 spaced by spacers (17), Fig. 3 (not shown), a compressed air hose 16 providing resilient loading. On passing a paper web over the roller 2 in cooperation with felt-covered guide rollers 7, the plates 13 co-operate with the knives 5 to produce perforation slits. To ensure even wear of the knives 5, the support bar 12 is reciprocated longitudinally through an eccentric connection and worm gear drive from the machine's power source, Fig. 3 (not shown). In alternative contstructions the plates 13 have bevelled edges to obviate the use of spacers, and may be formed of ceramics or hard metal, or an integral machined block may be employed; further the roller 2 may be reciprocated in relation to the bar 12.
Patent GB-1270879-A (GB)
Title: Electrically controlled valve
Inventor: FORD JAMES FERGUSON
IPC: F16K31/08
Filed: 1969-10-30
Abstract: 1,270,879. Valves. SANTON Ltd. 9 Nov., 1970 [30 Oct., 1969], No. 53270/69. Heading F2V.  A valve comprises a closure member 10 of magnetic material co-operating with a seat 11 and positioned with a clearance space on one side of a diaphragm 13 of non-magnetic material. A bi-metallic thermal element 14 on the. other side of the diaphragm carries two electric terminals 17 and a permanent magnet 16 which attracts the closure member to open position when the element 14 is heated and bends toward the diaphragm by current passed through at least one conductive metal of the element. The element may be U- or W-shaped. The valve is incorporated in an off-peak electric water storage heater, in which a replenishment tank (3), Fig. 1 (not shown); is mounted on top of the heater (2) and the valve is connected through pipes 8, 12 to the tank and heater.
Patent GB-1191880-A (GB)
Title: Temporary Axle Assemblies with Air Bag and Torsion Arm Suspension
IPC: B60P3/40
Filed: 1967-11-23
Abstract: 1,191,880. Temporary axle structure. GICHNER MOBILE SYSTEMS Inc. 23 Nov., 1967 [23 Nov., 1966], No. 53411/67. Heading B7D. A temporary axle assembly for attachment to a load container 16 for transport purposes comprises an axle 32 having wheels 28 which may be pivoted at 34 for steering by a tow arm 26 through linkages 36, 38 or may be non-steerable. Towards each end, the axle is pivoted to a supporting structure by an assembly comprising a torque arm 42 and a suspension arm 44. The torque arm 42 comprises a tube 48 connected to the axle 32 with the aid of a sleeve member 50, and a tube 62 telescopically mounted thereon and retained in position by means of resilient discs 56, the arm 62 having a fixed flange 60, pressure being exerted upon the discs 56 through a bolt 66 and plate 68. The tube 62 is pivoted at 64 to the suspension arm 44 which comprises a plate 80 and depending flanges 82 and is pivoted at 86 to the support structure. An hydraulic ram 108 extends between the suspension arm 44 and support structure for raising the load, a brace 114 having a lock 120 being provided for retaining the load in the raised position. The arm 44 bears upon the axle 32 through an air spring 94 and a vibration damper 102 and bump stop 98 are provided. The support structure for attachment to the load may comprise a transverse beam 136, upright 126, diagonal 152, support hooks 148 and a roller 146 to facilitate positioning the load. In a modification, Fig. 12, the torque arm 206 and suspension arm 208 are mounted at 222, 224 upon the support structure, with a common pivot axis. In a modified support structure arrangement, Fig. 14, the suspension assemblies are connected to uprights 252 which are rigid with a beam 254 and the load is connected to brackets arranged on the inside of the uprights 252 and to uprights 258 which are connected to the uprights 252 by means of torque tubes 256.
Patent GB-1263115-A (GB)
Title: Internally insulated and lined pressure vessel
Inventor: HEINZE WALTER WILLIAM
IPC: B01J8/00
Filed: 1969-11-03
Abstract: 1,263,115. Pressure vessel with internal insulation and lining. UNIVERSAL OIL PRODUCTS CO. 3 Nov., 1969, No. 53746/69. Headings B1F and B1X. [Also in Division F2] A metal lining for an internally thermally insulated pressure vessel comprises two parts 10 and 11, the lower part 11 being supported by members 13 which extend through slots 14 in part 11, Fig. 4. The metal lining may be of steel to prevent acid corrosion. The internal insulation may be of light weight, concrete type (exemplified), tile or pre-formed light weight block insulation cut to cover the internal wall. The construction is stated to allow drainage of liquid from behind the lining.