baber/WOPTO huggingface dataset:
Patent GB-519672-A (GB)
Title: Improvements in and relating to electric oscillation generators
IPC: H03B5/10
Filed: 1938-07-01
Abstract: 519,672. Valve generating circuits. TELEPHONE MANUFACTURING CO., Ltd., and PADDLE, L. H. July 1, 1938, Nos. 19523 and 24014. [Class 40 (v)] In a generator the path from the valve output to the resonant circuit or the path to the valve input includes means including an asymmetrically conducting impedance the voltage conditions of which are adjustable for suppressing part of the cycle of current in that path so that feedback occurs during less than 360 degrees in each cycle. Fig. 2 shows an arrangement in which the feedback from the anode to the tuned circuit L1C1, includes a rectifier M1 biassed from a resistance R4 in the anode supply. The pass direction of the rectifier determines whether a positive or negative pulse permits current to flow to the tuned circuit and is preferably so arranged that the feed is when the grid is swinging negative to avoid grid current. The bias of the rectifier controls the length of the cycle and so the amount of feedback. The feedback path may include a resistance in series with the rectifier and the bias may be derived from a separate battery. The resonant circuit may be coupled to the input by an impedance step-down device. A screen grid or pentode valve may be used with the load taken from the screen and the feedback from the anode circuit. The anode may be operated at a low potential so that a non-sinusoidal voltage is produced thereat. The asymmetric conductor may be a dry contact rectifier and may be arranged in the grid circuit in series with a resistance, Fig. 10 (not shown). The bias control may be automatic by means of a rectifier M2 and load resistance R8, Fig. 5, fed from the output. The grid potential may be limited by a grid leak or a rectifier and condenser when grid current occurs. Phase control means may be associated with the feedback circuit comprising a condenser in series or parallel with the rectifier, Fig. 8 shows an arrangement in which phase control is produced by condenser C4 and adjusted by series resistance R10.
Patent GB-1262935-A (GB)
Title: A quick tool-change mechanism
IPC: B23B19/00
Filed: 1969-04-16
Abstract: 1,262,935. Chucks and sockets. CINCINNATI-NEDERLAND N.V. 16 April, 1969 [17 April, 1968], No. 19535/69. Heading B3B. A quick-change tool-holder comprises a spindle 1 having a conical socket for a flanged tool-holder 2, a clamping ring 4 having projecting lugs 5 which in one position overlie the flange 3 of the tool-holder but which can be aligned with slots in the flange 3 to allow for removal of the tool-holder, and springs 9 which bear on a collar 7 axially secured by ball-bearing 6 to the clamping ring 4 to provide clamping pressure thereto. The spindle 1 is mounted in an axially movable quill 21, movement of which to the right, as shown, brings collar 7 into abutment with a stop-ring 16 secured to the spindle housing, then compresses the springs 9 and releases the lugs 5 of the clamping ring 4 from the flange 3 of the tool-holder; the ring 4 may then be rotated through 30 degrees to align the lugs 5 with the slots in the tool-holder flange for replacement of the tool-holder. Movement of the quill may be effected manually, hydraulically or electrically and may be arranged to operate a stop switch controlling the rotation of the spindle.
Patent GB-399294-A (GB)
Title: Process for separating separate kinds from a mixture of solid bodies of different specific gravity
IPC: B07B1/12
Filed: 1932-07-11
Abstract: 399,294. Separating solid materials. HEIDENREICH, H., 5, Gartengasse, Mahrisch, Ostrau, Czecho-Slovakia. July 11, 1932, No. 19626. Convention date, July 11, 1931. (Classes 82 (ii) and 117.] In the separation of granular materials of different specific gravity, the materials are subjected to the agitating action of grate bars A, B, Fig. 7, which alternately rise and fall in parallel planes without horizontal displacement so that the particles arrange themselves in superposed layers according to density. The action may be assisted by air or water passed between the bars. The tops of the bars may be bevelled or ridged, and, in order to provide a continuous process, they may be stepped as shown in Fig. 11, or inclined as shown in Fig. 12. A flexible covering may be secured to the bars to prevent the fine material passing between them ; and in a further modification the bars may be spaced sufficiently to sift the lower layer of denser material. The Specification as open to inspection under Sect. 91 comprises also an arrangement in which the bars reciprocate parallel to themselves in a direction inclined to the vertical and horizontal planes, and another arrangement in which the bars are of elliptical shape and rotate. This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specification 2544/09, [Class 117, Sifting &c.].
Patent GB-1309366-A (GB)
Title: Ion source for a cyclotron
IPC: H05H13/00
Filed: 1971-06-09
Abstract: 1309366 Ion sources KERNFORSCHUNG mbH GES FUER 9 June 1971 [16 June 1970] 19633/71 Heading H1D A metal wire stirrup 12 acting as a thermionic cathode in an ion source for a cyclotron is provided with a tip 13 of refractory metal or metal carbide located opposite an electron reflector 7.  The discharge chamber comprises an enlarged lower part 5 of Mo and a narrower neck portion 2 of tantalum carbide. The discharge is constructed by a magnetic field located in or parallel to the plane of the discharge. The reflector 7 of W or hafnium carbide is insulated from the chamber 2 by an insulator 6 of boron nitrite which may carry a Mo plate to prevent evaporation of the insulator. The tip 13 which may be cylindrical, as shown, or conical is preferably made of hafnium carbide and is located in a holder 15 of Ta having a pin 17 which is brazed into a bore in the bight 14 of the W cathode 12. Alternatively, a pin 17 may be formed on a tip 13 of W, the holder 15 being omitted. Ions are extracted through a slot 9 in the wall of the discharge chamber by an electrode 8. The chamber is filled with deuterium, hydrogen, or helium at a pressure of 0À2 to 0À4 torr.
Patent GB-1070629-A (GB)
Title: Improvements in and relating to vapour-compression refrigeration apparatus
Inventor: ROSENFELD LEV MARKOVICH
IPC: H01L35/30
Filed: 1964-05-12
Abstract: 1,070,629. Thermoelectric devices. LENINGRADSKY TEKHNOLOGICHESKY INSTITUTE KHOLODILNOI PROMYSH. LENNOSTI. May 12, 1964, No. 19670/64 Heading H1K. [Also in Division F4] A thermo-electric cooling device comprises a tube 6 for the passage of a liquid to be cooled, a plurality of copper elements 9 disposed along the tube, each element encircling the tube and being connected at its opposite sides with semiconductor elements 12, and further copper elements 14 which connect elements 12 electrically in series and are formed with passages for a coolant. Rods 16 are disposed in said passages. The tube has internal ribs and the thickness of elements 12 increases in the direction of liquid flow through the tube. Tube 6 is formed of aluminium and its external surface is anodized.
Patent GB-1056646-A (GB)
Title: Polyurethanes
IPC: C09D175/06
Filed: 1965-05-10
Abstract: A polymerizable composition comprises (A) a polyisocyanate, polyisothiocyanate or a mixture thereof, and a mixture of polyhydroxy substances containing (B) a polyhydroxy alkanolamide of the formula <FORM:1056646/C3/1> where R is the hydrocarbon radical of a polymeric fat acid, x is an integer having an average value of from 2 to 4 and R1 is a divalent aliphatic hydrocarbon radical having from 1-8 C and (c) a polyester polyol the acid component of which is at least in part a dimeric fat acid. The term "polymeric fat acid" is defined as the dimerized and polymerized acids obtained from "fat acids."  The term "fat acids" is defined as saturated, ethylenically and acetylenically unsaturated naturally occurring or synthetic monocarboxylic aliphatic acids containing from 8-24 C.  The polyisocyanate may be aromatic, aliphatic or cycloaliphatic. The alkanolamide may be an N,N,N1, N1-tetrakis-(2-hydroxyethyl) dimeramide, e.g. that derived from tall oil fatty acids.  In a typical Example (1) a polyester polyol derived from dimeric tall oil fatty acids, phthalic anhydride, trimethylolpropane, diethylene glycol and p-toluene sulphonic acid was mixed with the N,N,N1,N1 - tetrakis - (2 - hydroxyethyl) dimeramide derived from tall oil fatty acids, organic solvent and the prepolymer derived from toluene diisocyanate and trimethylolpropane.ALSO:Surface coatings are prepared from a polymerizable composition which comprises (A) a polyisocyanate, polyisothiocyanate or a mixture thereof, and a mixture of polyhydroxy substances containing (B) a polyhydroxy alkanolamide of the formula:  <FORM:1056646/B1-B2/1> where R is the hydrocarbon radical of a polymeric fat acid, x is an integer having an average value of from 2 to 4 and R' is a divalent aliphatic hydrocarbon radical having from 1-8 C and (C) a polyester polyol the acid component of which is at least in part a dimeric fat acid. Substrates may be tin and steel, and glass. The term "polymeric fat acid" is defined as the dimerized and polymerized acids obtained from "fat acids".  The term "fat acids" is defined as saturated, ethylenically and acetylenically unsaturated naturally occurring or synthetic monocarboxylic aliphatic acids containing from 8-24 C.  The polyisocyanate may be aromatic, aliphatic or cycloaliphatic.  The alkanolamide may be an N,N,N',N' tetrakis-(2 hydroxyethyl) dimeramide, e.g. that derived from tall oil fatty acids.  In a typical Example (1) a polyester polyol derived from dimeric tall oil fatty acids, phthalic anhydride, trimethylolpropane, diethylene glycol and p toluene sulphonic acid was mixed with the N,N,N',N' tetrakis (2-hydroxyethyl) dimeramide derived from tall oil fatty acids, organic solvent and the prepolymer derived from toluene diisocyanate and trimethylolpropane.  This composition was then applied to steel and tin in a 3 mil. thickness and baked at 300 DEG F. for 30 minutes.
Patent GB-797090-A (GB)
Title: Improvements in or relating to diode amplifiers
IPC: H03K7/02
Filed: 1955-07-07
Abstract: 797,090. Transistor pulse modulation and switching circuits. BURROUGHS CORPORATION. July 7, 1955 [Feb. 15, 1955], No. 19695/55. Classes 40 (5) and 40 (6). In a circuit employing a diode 31 a control signal source 41 varies the reverse impedance of the diode so that a pulse from a source 40, Fig. 2, applied in the reverse sense to diode 31 is correspondingly attenuated. The normal reverse impedance of diode 31 is high, Fig. 1, but if a forward current has flowing curves a, b, c the reverse impdance is momentarily reduced. Assuming discharge tube 33 to be cut-off, Fig. 3, curve 15, diode 31 presents a high impedance so that the pulse 12 is very little attenuated over resistor 34 and a pulse 16 is fed to output terminals 39. If the control current through the anode of tube 33 is set at an intermediate value 17 then the impedance of diode 31 is comparable with that of resistor 34 and a pulse 18 is sent out. With a heavier current the impedance of diode 31 upon the occurrence of pulse 12 is substantially zero and a negligible pulse is fed to the output. The circuit may be applied to read digital information from a magnetic drum, track 41, Fig. 5, having magnetized spots in one or other sense while track 40 has a series of regularly magnetized spots which cause pulses 75 to appear in the secondary of transformer 36. The signals from track. 41 are in one or other of the forms shown in curves 71 or 72 in which the clock pulse 75 coincides with the latter half of the first half-cycle. Discharge tube 33<SP>1</SP> is normally biased off so that the part of curve 71 occurring during pulse 75 maintains the anode current at zero so that diode 31 has a high reverse impedance and a large amplitude pulse 76 is fed to the output 39. In contrast the pulse 72 causes the tube to conduct and the diode 31 to have a low reverse impedance and a negligible output pulse 77 occurs. In a modification, Fig. 4, the control signal source 41 operates a relay contact 22 to cause thermionic diode 23 to pass current so that diode 31 assumes a low reverse impedance. The output is taken across the resistor 34 and a resistor is included in the anode lead of diode 23 to prevent the pulse 12 being shunted away.
Patent GB-433496-A (GB)
Title: Method of and apparatus for reducing the pressure on mixture containing liquid and other constituents
IPC: F16K1/02
Filed: 1934-07-04
Abstract: 433,496. Valves. UHDE, F., 12, Degginstrasse, Dortmund, Germany.-(also Assignee of Bredtschneider, K. ; 70, Heiliger Weg, Dortmund, Germany) July 4,1934, No. 19727. Convention date, July 4, 1933. [Class 135] A valve for releasing the pressure on mixtures containing liquid and solid substances under high pressures, such as occurs in autoclaves, oil wells &c., where the parts are subjected to considerable corrosion and abrasion, comprises a chamber A through which the mixture flows under control of an annular aperture formed by a replaceable member in the form of a rod C and a replaceable tubular member B having a bore of the same or practically the same diameter as the rod C, regulation being effected by relative axial movement of the two members. The adjustment may be effected by a screwed shaft D mounted as shown or directly in line with the rod C. To prevent grooving of the members the rod C may be rotated continuously by gearing E or vanes may be formed on the rod which is then rotated by the fluid flow.
Patent GB-730205-A (GB)
Title: Improvements in or relating to echo-sounding apparatus
Inventor: CHAMBERS GEOFFREY EDWARD
IPC: G01S7/60
Filed: 1952-08-06
Abstract: 730,205. Echo-sounding apparatus. SUBMARINE SIGNAL CO. (LONDON), Ltd. Aug. 6, 1953 [Aug. 6, 1952], No. 19789/52. Class 118 (2).  In a pulse echo-sounder comprising an electro-chemical depth recorder with a stylus mounted at the end of a rotating arm so as to traverse periodically a record strip of paper which is moved longitudinally at a constant low speed, a pulse for triggering the transmitter is generated by momentarily completing the power supply of a trigger unit 35 through a keying switch comprising a drum 21 rotating synchronously with the stylus arm, the insulating surface of the drum having a conductive segment 23 and a contact roller 22 being maintained in engagement with the drum by a spring, Fig. 1 (not shown); alternatively the drum surface may be conductive and the segment 23 insulating, the trigger pulse being then initiated by breaking a circuit. A similar switch 16-18 may be selected by switch 24 to delay the commencement-of the recording period relative to the time of pulse transmission. the segments 17, 23 of the two switches being circumferentially displaced; additional keying switches providing different delays may be provided. The invention is described as applied to a recorder with a plurality, e.g. two, of angularly-spaced stylus arms, each keying switch comprising a corresponding number of circumferentially-spaced segments or contact rollers. A 1:6  two-speed gear-box is provided for operating the recorder selectively at one of two predetermined speeds so that the range calibration marks represent fathoms or feet, respectively, and when operated at the higher speed, switches 37 and 38 are opened by the gear lever to connect the keying switches 16 and 21 in series with drum timing switches 26 and 27 respectively, each of which has a single conductive segment 28, 29 and pair of contact fingers 30, 31, the timing drums being rotated  at 1/ 6  the speed of the keying drums 16, 21 so that only one pulse is transmitted during every six revolutions of the stylus arms. During high-speed operation only one of the two styli is effective and this stylus is connected to the receiver through a further drum switch 39 which is similar to and mounted on the same spindle as the timing drums 26, 27 so that the stylus circuit is closed once in every six revolutions of the stylus arm for a time interval slightly longer than that taken by the stylus to traverse the record strip as described in Specification 730,206.
Patent GB-943180-A (GB)
Title: Variable focal length lens system
IPC: G02B15/14
Filed: 1962-05-23
Abstract: 943,180. Variable focal length lens systems. P. ANGENIEUX. May 23,1962 [May 31, 1961], No. 19823/62. Drawings to Specification.. Heading G2J. A variable focal length lens system comprising a first frontal convergent member which is fixed for focusing on an object at any given distance, a second axially movable divergent member, and a third axially movable convergent member, all these members being aligned on the same optical axis in front of a fixed correcting member also aligned on the same optical axis, is characterized in that said second member produces a  magnification lower than 0. 5 (and preferably greater than 0.15) when it has completed its forward stroke while simultaneously the third member, which has then completed its backward stroke, produces a magnification also lower than 0. 5 (and preferably greater than 0. 15), said third member consisting of at least three lens elements among which are a divergent lens element having a concave rear face and a convergent lens element located behind the rear face of said divergent lens element at a distance which at minimum is zero and at maximum is 5% of the focal length of the third member, the front face of said convergent lens element being convex and having a radius of curvature at least equal to that of the rear face of said divergent lens element, this last-named radius being greater than half the focal length of said third member (and preferably less than twice this focal length). Preferably the ratio of the focal length of said third member to that of said second member ranges from 1 to 1. 6. Numerical data for three examples of embodiment are given.
Patent GB-1347417-A (GB)
Title: Screw extruder
IPC: B29C48/68
Filed: 1972-04-28
Abstract: 1347417 Extruders CREUSOT-LOIRE 28 April 1972 [11 May 1971] 19843/72 Heading B5A A screw and barrel extruder has a first section (not shown) in which the screw has a succession of threads of different pitch and rotates coaxially within a circular bore of the barrel to subject the material to be extruded to compression, expansion and shearing forces to homogenize it, and a second section in which the screw 3 and the barrel are both threaded and the screw describes a planetary motion about the axis of the barrel in the manner of a Moineau pump to extrude a section or tube of thermoplastics material through a die. In the pumping section the screw has four threads and the barrel has five threads of 5/4 the pitch, thus forming four helicoidal closed chambers which progress along the screw as it rolls around the inside 2 of the barrel. The plastics material may be plasticized and coloured and the barrel may be heated.
Patent GB-440743-A (GB)
Title: Improvements relating to flexible metallic tubing
IPC: F16L11/15
Filed: 1934-07-06
Abstract: 440,743. Flexible metal tubes. POWER FLEXIBLE TUBING CO., Ltd., Derby Works, Finsbury Park, London.- (Assignees of Debenedetti, R. ; 50, Via Cervino, Turin, Italy) July 6, 1934, No. 19905. Convention date, July 29, 1933. [Class 99 (ii)] Metal tubing is composed of two metal tubes 1, 3 with an interposed layer or layers 2 of plastic or elastic material, e.g. rubber, the tubing being corrugated helically or annularly to secure flexibility. The outer tube may be made of wear-resisting metal such as iron, copper or copper-alloy and the inner tube of lead or other metal proof against the chemical action of the fluid passing through the tubing, and the rubber, which may be in a compressed condition, is preferably vulcanized after the tubing is corrugated. In a modification the tubing consists of more than two metal tubes with a rubber layer between each or some of them.
Patent GB-1224101-A (GB)
Title: Improvements in or relating to centrally-controlled telephone systems
IPC: H04Q3/54
Filed: 1969-04-18
Abstract: 1,224,101. Automatic exchange systems. SIEMENS A.G. 18 April, 1969 [19 April, 1968], No. 19923/69. Heading H4K. A priority subscriber in a PBX may seize a busy relay set in order to set up a local or outgoing call by dialling a special code into an auxiliary relay set to which he is automatically connected whenever the normal relay sets are all busy. The normal relay sets are universal in that they can be used for local or outgoing calls but once in use such a set can only be preemptied if the priority caller requires a similar type of call. If a normal relay set is free but all the exchange lines are busy, the priority caller causes one of these lines to be connected to the relay set to which he has been connected by dialling the special code thereinto. Whenever all the relay sets or exchange lines are busy, one of the relay sets handling a non-priority local call and one handling a non-priority outgoing call are connected to a tone source which provides the subscribers connected via these sets with an indication that their calls are liable to be forcibly interrupted. " All relay sets busy " and " all lines busy " conditions are detected by the setting of respective magnetic cores due to the total of current increments supplied to windings thereof from each busy relay set or line. The cores are periodically scanned and if " set " a transistor is turned-on in order to initiate a search for non-priority relay sets to which the warning tones can be supplied. Depending on the call direction required by a priority subscriber and the type of equipment busy condition encountered, one of four programmes for setting up his call is initiated by central control. In the relay sets, all relays which are connected to common busses are decoupled by rectifiers.
Patent GB-199559-A (GB)
Abstract: 199,559. Hartsock, F. R., Dickey, C. O., and Dickey, L. E. May 6, 1922. Tyres, elastic, tools for removing and replacing. -A tool for use with all types of transverselydivided rims comprises means for expanding and contracting the rim and also means for drawing the split ends of the rim out of. alignment. Two arms 10 are pivoted together at 11 and each carries rim-gripping jaws 12 at the outer end. The jaws 12 are attached to a head 13 on the arm by means of a clamping bolt 14, which carries a lever-nut 17, and are connected at their inner ends by a spring 20 which passes through a lug 21 on the head 13. The front end of each jaw is provided with a V-shaped rim-gripping groove, to the inner side of which is riveted a steel plate 19, the squared ends of which bite into the rim. A lug 23 on each jaw 12 works in a groove 22 in the corresponding face of the head 13, both the lug and the groove being horizontally curved on an are struck from the centre of the bolt 14. Screws 24 pivoted to the arms 10 are threaded into a rotatable sleeve 27, to which is fixed a ratchet 28. A hand-lever 29 pivotally mounted on the sleeve 27 carries a spring-actuated snap-over pawl adapted to rotate the ratchet and the sleeve to expand or contract the rim. A chain 32 or other flexible member is connected to the pivot 11 and also adjustably to the lower end of a hand-lever 33 which is provided with a pivotal hook 35. The hook 35 is adapted to engage the rim to either side of the joint. By pulling the lever 33 inwardly, the whole frame is swung about the nearer bolt 14 as fulcrum to disalign the ends of the rim. To re-align the rim-ends the hook 35 is attached to the rim on the opposite side of the joint. In use, the device rests on a tripod consisting of the bolts 11, 14. To remove the rim, the jaws are clamped thereto on either side of the split, the rim is expanded, the ends disaligned, and then the rim is contracted to allow the ends thereeof to overlap.