baber/WOPTO huggingface dataset:
Patent GB-598287-A (GB)
Title: Improvements relating to tone correction or modification in audio frequency amplifiers
IPC: H03G9/08
Filed: 1939-04-25
Abstract: 598,287. Valve amplifying circuits. COLE, Ltd., E. K., and HUTCHINGS, E. L. April 26, 1939, No. 12359. [Class 40 (v)] In a tone control arrangement, with negative feedback to a valve V2 and positive feedback to a preceding valve V1, the frequency discriminating feedback circuit comprises a variably tapped resistance in parallel with a condenser and series resistance connected to the grid of valve V1, the variable tap being connected to the anode of valve V2. The anode of valve V2 is connected to the movable tap S of resistance R4, one end of which is connected through a resistance R3 and a volume control potentiometer R1 to the grid of a preceding valve V1. The other end of resistance R4 is connected through a condenser C2 and resistance R5 to the junction of resistances R1 and R3. When the slider S is at the left-hand end of resistance R4, the negative feedback to valve V2 through condenser Cl comprises the higher frequencies, while the low frequencies pass to the grid of V1 via resistance R3 as positive feedback. When slider S is at the right-hand end of resistance R4, there is little or no negative feedback at the higher frequencies to valve V2, while the highest frequencies pass through condenser C2 to give positive feedback to valve V1. Specification 524,690 is referred to.
Patent GB-727673-A (GB)
Title: Improvements in or relating to automatic pilots
IPC: G05D1/08
Filed: 1952-05-16
Abstract: 727,673. Automatic steering control systems. SPERRY CORPORATION. May 16, 1952 [June 8, 1951], No. 12439/52. Class 38 (4). In a system for automatically steering a ship, deviations from a course set by a hand wheel 25, Fig. 2, are detected by a gyrocompass 8 associated with a repeater compass 14 which adjusts, by means of a potentiometer 16, the input to a winding 40 of a magnetic amplifier 58, the output of which, through relays 80, 82, operates an electric servomotor 4 in the appropriate direction to correct course by adjustment of the ship's rudder 2. A potentiometer 38 driven by servomotor 4 and forming a bridge circuit with potentiometer 16, provides a follow up signal. The amount of rudder correction corresponding to a given course deviation may be set by knob 46 operating rheostats 44, 441. A generator 50 coupled to gyro 8 and energizing an auxiliary input winding of magnetic amplifier 58, provides an anti-hunt signal. Sensitivity of control may be set by knob 56 operating rheostats 48, 54 in the course deviation and anti-hunt circuits respectively. When it is desired to control servomotor 4 by hand wheel 25 only, a control lever, Fig. 1 (not shown), is operated to disengage a mechanical clutch 22. Under these conditions generator 50 is disconnected. A third position of the control lever de-energizes the whole system when direct manual operation of the rudder is desired. A switch 86 cam-operated with potentiometer 16 ensures that the system can only be changed from direct manual control to servomotor control when the rudder is central. Self-holding relay 94 maintains the system energized thereafter. Servomotor 4 is provided with normal limit switches 1, 3 and, in addition, closer limit switches 9, 11 which are effective during automatic steering but are shortcircuited by cam-operated contacts if the hand wheel is moved more than a predetermined extent during manual control of servomotor 4. Specifications 717,729, [Group XXIX], and 727,719 are referred to.
Patent GB-920042-A (GB)
Title: Improvements relating to the production of objects or parts from synthetic-resin material reinforced with glass fibre
IPC: B29C70/48
Filed: 1961-04-06
Abstract: 920,042. Moulding cellular resin articles. DUROPLAST SCHAUMVERBUNDBAU G.m.b.H. April 6, 1961 [April 6, 1960], No. 12444/61. Class 87(2). In a process for producing lightweight articles such as constructional parts for prefabricated buildings, low density cores 5, 6, which may be of foamed synthetic resin, or pressed straw or hemp sealed against taking up resin, are placed in a mould (not shown) and sheathed with glass fibre fabric which fills the spaces in the mould. The mould is closed and hardenable casting resin, such as unsaturated polyester resin, is forced under pressure into the mould and hardened to form an outer wall 1, an inner partition 2, ribs 3 and bridge pieces 4 reinforced with glass fibre. For some purposes only one core may be used.
Patent GB-1026541-A (GB)
Title: Improvements relating to locks
Inventor: WHITEHURST LAWRENCE
IPC: E05C3/10
Filed: 1961-04-07
Abstract: 1,026,541. Sash locks. LOWE & FLETCHER, Ltd. and WILKES BERGER ENGINEERING CO., Ltd. July 5, 1962 [April 7, 1961], No. 12495/61. Heading E2A. A sash lock having an eccentrically pivoted bolt 22 formed with a driven gear element, e.g. a toothed edge 26, is characterized in that a driving gear element 30 mounted on a spindle 31 is moved to the position in Fig. 1 where its teeth 30c, 30d obstruct movement of the teeth 26b, 26c of the element 26, to maintain the bolt in its locked position. The element 30 may be spring-biased to the locked position or be maintained there by its weight or it may be rotated by a key. In a modification a sliding bolt replaces the angularly movable bolt. In a further modification a cylinder-type key actuated lock intervenes between the key and the driving gear element, with the barrel forming the means for rotating the driving gear element.
Patent GB-437444-A (GB)
Title: Improvements in or connected with optical sights
IPC: G02B23/10
Filed: 1934-04-26
Abstract: 437,444. Gun sights. BARR & STROUD, Ltd., and MACGILL, C. D., Caxton Street, Anniesland, Glasgow. April 26, 1934, Nos. 12564/34 and 12140/35. [Class 92 (ii)] Relates to sights in which the target is viewed through a transparent screen 9 and an image of an illuminated or luminous ring is reflected from the screen whereby the sighting of the gun may be corrected for the speed of the target. According to the invention, the image of the ring is obtained by an annular optical member such as a parabolic reflector 2, Fig. 1, or an annular series of inclined optical members such as a ring of parabolic mirrors K, Fig. 3, or a ring of lenses P, Fig. 7, the source of light in the form of an illuminated ring or a ring of illuminated points being at the foci of the optical members, whereby an annular beam of light is projected on to and reflected from the screen. In Fig. 1, the surface of revolution forming the mirror 2 is generated by the arc of a parabola, the axis of which is inclined to the central axis A B. The source of light 4 illuminates an adjustable circular slit 3, embracing the foci of the parabolic arcs, and a central hole 7, the image of which is thrown on to the screen by a lens 6 to form the ring centre. In Fig. 3, the source of light 4 illuminates from below a ring of points 15 at the foci of a series of inclined parabolic mirrors K attached to a plate L. In Fig. 7, light reflected from a surface 16 illuminates a series of holes 17 at the foci of a ring of inclined lenses P.
Patent GB-773150-A (GB)
Title: Improvements in or relating to the preparation of steroid compounds
Inventor: ELKS JOSEPH
IPC: C07J71/00
Filed: 1954-04-30
Abstract: 3b ,12b  - Dihydroxy - 11 - oxo - 23 - bromo-5a , 22a-spirostan is prepared by hydrolysing an 11,23-dibromo-hecogenin ester with caustic alkali in solution in aqueous tertiary butanol or aqueous dioxan. The caustic alkali is preferably sodium or potassium hydroxide, a suitable concentration of caustic alkali being between 0.5 and 15 per cent by weight, preferably between 2.5 and 10 per cent by weight, of the reaction mixture.  The hydrolysis may be carried out at a temperature between 70 DEG  C. and the boiling point of the solvent used.  The above process may be modified in that the 11,23-dibromo-hecogenin ester is prepared by dibrominating hecogenin ester at the 11- and 23-positions in solution in dioxan, and aqueous caustic alkali is then added to the reaction mixture to carry out the desired hydrolysis to form 3b ,12b  - dihydroxy - 11 - oxo - 23 - bromo-5a ,22a-spirostan. The 11,23-dibromohecogenin ester or hecogenin ester used in the above process may be the acetate.  The above processes may be extended to prepare diesters of 3b ,12b  - dihydroxy - 11 - oxo - 5a ,22a - spirostan by esterifying the 3b ,12b -dihydroxy-11-oxo-23-bromo-5a ,22a-spirostan, e.g. by heating with acetic anhydride and pyridine, and the product is debrominated by treatment with zinc and acetic acid.  A number of detailed examples are given illustrating the above processes, in addition 3b ,12b  - dihydroxy - 11 - oxo - 23 - bromo-5a ,22a-spirostan is debrominated with zinc and acetic acid and is then acetylated to form 3b -12b  - diacetoxy - 11 - oxo - 5a ,22a - spirostan.  Reference has been directed by the Comptroller to Specification 721,953.
Patent GB-1083205-A (GB)
Title: Swing door
IPC: E06B3/80
Filed: 1965-03-25
Abstract: 1,083,205. Hinges. B. STAMM. March 25, 1965 [May 8, 1964], No. 12659/65. Heading E2F. [Also in Division F2] A swing door 2, which may be a sheet of P.V.C. or of wood or metal, mounted in a frame 1 is pivoted by spring urged hinges which return the door to a central position or retain the door in an open position if opened sufficiently to pass a dead centre position. In one form, Fig. 7, the moving part of the hinge is mounted in the frame 1, the fixed part 31 of the hinge carrying cams 36 engaging shoulders on the moving part. A spring 34 adjusted by a nut 35 loads the hinge. When the door is opened to the position shown in chaindot it remains open. An edge 42 on the frame is elastically deformable a n d swings against the door frame to make a tight fit. The shape of cams 36 can be altered by means of inserts to alter the position at which the door will remain open. The nut 35 may have teeth on its exterior engaged by a spanner in the form of a worm gear to adjust the spring load without dismantling the hinge. In an alternative embodiment, the cams are on the moving part of the hinge and the spring is mounted in a tube forming part of the fixed portion of the hinge, the tube being let into the door frame.
Patent GB-1260455-A (GB)
Title: Improvements in or relating to sparking plugs for internal combustion engines
IPC: H01T13/38
Filed: 1970-03-17
Abstract: 1,260,455. Sparking-plugs. ROBERT BOSCH G.m.b.H. March 17, 1970 [March 18, 1969], No. 12786/70. Heading F1B. A sparking-plug insulator 12 comprises grooves 15 of substantially trapezoidal section on its outer surface.
Patent GB-197696-A (GB)
Title: Improvements relating to sewing machine awls
IPC: B23D67/00
Filed: 1923-05-14
Abstract: 197,696. United Shoe Machinery Corporation, (Assignees of Rollins, Le R. W.). May 15, 1922, [Convention date]. Void [Published under Sect. 91 of the Act]. Filing-apparatus, reciprocating.-A device, for testing and pointing curved awls used in leathersewing machines, comprises jaws 12, 14 which are shaped to hold the awl 52 rigidly, and have hardened faces 40, 42, 44 adapted to guide a file F and a curved plate 35 secured to the jaw 12, having a curved edge adapted to fit a correctly shaped awl. The jaws are opened by a spring 20 closed by a screw 24 and guided by pins 16. The device may have a handle 10.
Patent GB-349257-A (GB)
Title: Improvements in or relating to the manufacture of therapeutic substances
IPC: A61K35/30
Filed: 1930-04-25
Abstract: A preparation which is capable of assisting and regulating the central nervous functions is obtained by precipitating aqueous or aqueous saline extracts of the central nervous organs, e.g. the brain of vertebrate animals with organic liquids such as alcohol. Ox brains are ground with quartz and extracted with water and the separated liquid poured into alcohol whereby a flocculent precipitate is produced which is centrifuged and washed with alcohol and dried at 37 DEG  C.  The material may also be obtained from dispersions, press juices, &c.
Patent GB-1091153-A (GB)
Title: Ringing method for telephone systems
IPC: H04Q3/00
Filed: 1965-03-26
Abstract: 1,091,153. Telephone systems. STANDARD TELEPHONES & CABLES Ltd. March 26, 1965 [April 1, 1964], No. 12912/65. Heading H4K. To avoid a called party lifting his handset in answer to a call which has just been abandoned by the calling party, an additional period of ringing current which is easily distinguished from normal ringing current is connected to the called line to signal calling party release.
Patent GB-492111-A (GB)
Title: Improvements in or relating to dance and stage floors
IPC: A63G31/14
Filed: 1937-05-06
Abstract: 492,111. Stage platforms. ROZSNYAI, S. May 6, 1937, No. 12944. [Class 132 (i)] The space for exhibition turns on a dance floor comprises an annular disc 12 fitting a cylindrical recess in the floor and a smaller central disc 44, the discs being rotatable at various speeds in either direction and being independently movable up and down. The rotation is effected by a friction cone 34 driven from an electric motor 31 and engaging a wedge-section ring 30 on a frame 4. The frame 36 carrying the bearings 35 of the shaft 33 of the cone 34 is rotatable about a pivot 37, Fig. 3, and is supported by springs 38 serving to press the cone 34 against the ring 30. A friction cone 40 positively geared to the cone 34 engages the upper face of the ring 30. The disc 12 is fitted with wheels 22 running on an annular rail 21, and it is lifted by motor-driven racks 27 carrying rollers 28 engaging annular rails 25 on the disc. The disc 44 is raised and lowered by a motor-driven nut 46 engaging a screw-thread on the shaft 45 supporting the disc. As the disc 44 is lowered, a safety cylinder 66 is raised when a slide 55 engages another slide 72 connected to the cylinder 66 by ropes 69 passing over pulleys 68. The driving- motors are controlled by switches at the bandstand.
Patent GB-274605-A (GB)
Title: Improvements in and relating to spikes, skewers and the like
IPC: A22C15/00
Filed: 1926-05-21
Abstract: 274,605. Jack, A. May 21, 1926. Eyes; kook-headed spikes.- A skewer a for hanging meat &c. has a hook or eye b with an external groove in which lies a cord e. The spike may be hollow.
Patent GB-311089-A (GB)
Title: Improvements in or relating to motor caravan trailers
IPC: B60P3/34
Filed: 1928-05-04
Abstract: 311,089. Caddick, S. May 4, 1928. Folding vehicles; vehicles convertible into caravans.-In collapsable caravan trailers of the type in which the two sides comprise horizontal panels which are hinged together and to a fixed bottom portion so that the panels can fold inwardly and the roof lowered, the sides comprise a number of longitudinal panels hinged together and to a roof which is formed as a single member and forms a complete roof for the collapsed caravan. As shown, the side walls comprise fixed panels 4 and folding panels 2, 3, the roof 5 being hinged to the panels 2. One end also comprises similar panels 6, 7, 8, the panels 6, 7 folding outwardly as shown in Fig. 2. The other end comprises folding panels 14, 15 hinged to panels 10 and a door 9 the upper part of which is foldable to correspond with the panels 14, 15. In a modification, the foldable parts of the end wall and of the door may be detachable and fixed in position when desired. Seats, tables, beds, &c. are provided in the interior.
Patent GB-955545-A (GB)
Title: Apparatus for separating, dividing or isolating tufts or pile in tufted fabrics and similar or suitable materials
IPC: D06C29/00
Filed: 1959-01-13
Abstract: 955,545. Treating tufted or pile fabrics with liquids. I. L. THATCHER. April 13, 1960 [Jan. 13, 1959], No. 13112/60. Divided out of 1161/59. Heading D1L. Apparatus for separating, dividing or isolating tufts or pile in tufted fabrics comprises means for traversing the fabric through the apparatus, for separating the tufts into longitudinal rows and for separating or subdividing the said rows into separate tufts or groups of tufts and for isolating the tufts into compartments which are sufficiently tight-fitting so that liquid dye added in one compartment does not run into the next compartment. Thereafter the separated tufts or groups may be separately treated, e.g. dyed by injecting liquid into the appropriate cells enclosing tufts. The fabric may be passed over a series of rollers and a table where the tufts may be separated into rows by the blades 9 of a separator as shown in Fig. 2, the rows then passing between further separators 12 (Fig. 4) with triangular shaped portions 13 which can be moved relative to one another to allow the tufts to pass along or, by aligning together, to form a series of cells each containing a separate group of tufts 14. The rollers for conveying the material through the apparatus may be fluted, serrated, clothed with wire teeth or friction material. The blades of separators may be adjustable both vertically and horizontally. The tufts may be passed through two initial separators of the type shown in Fig. 2 the fabric passing from the one to the other via a roller with spaced discs to keep the rows of tufts separate. The bars 12 may be heated to hasten drying after application of the dye or other liquid treatment.
Patent GB-131386-A (GB)
IPC: F41A25/20
Abstract: 131,386. Schneider et Cie..Tan. 24, 1918, [Convention date]. Recoil apparatus.-Relates to apparatus comprising a recoil brake, a recuperator, and a runout moderator, and consists in making them with a single sliding joint L between two relative ly movable parts A, B. In the form shown in recoiled position in Fig. 6, the part A is a pump barrel and carries an internal tube H, and the other part B is a hollow plunger, and carries a diaphragm G and a counter-rod E moving over and into the tube H respectively. The part A is attached to the recoiling part of the gun, and the part B to the fixed part of the gun. The recuperaator C is carried by the part. B. The recoil is governed by the profile of the rod H in its passage through the diaphragm G, and the run out by a valve F at the end of the rod E and by the profile of the rod E in its passage through a diaphragm H' at the end of the tube H; this end of the tube H is guided in the plunger B by a ring H<2> connected to the tube by webs h<2>. In modifications, (1) the plunger B carries the tube H, and the pump barrel A carries the diaphragm G and the counter rod E; (2) the plunger recoils, and the pump barrel is fixed; (3) the recuperator C is carried by the pump barrel, instead of by the plunger; (4) the recuperator is made annular, surrounding either the plunger or the barrel; (5) the port communicating with the recuperator is arranged to open into the recuperator about the middle of its length, so as to remain covered at all inclinations of the gun; and (6) .several ports are provided between the pump barrel and the recuperator.
Patent GB-253697-A (GB)
Title: Improvements in signalling (ringing) arrangements for carrier wave systems
IPC: H04J1/14
Filed: 1925-05-20
Abstract: 253,697. Western Electric Co., Ltd., (Western Electric Co., Inc.). May 20, 1925. Wired wireless systems; calling systems and apparatus. - An arrangement to ensure the transmission of calling or ringing signals between two distant stations on a carrier-wave system comprises means whereby the initial low-frequency ringing current is caused first to change the normal frequency of the local carrier-wave oscillation-generator, tn a new value which lies within the transmission range of the line, and then to modulate the new carrier at audible frequency. At the receiving end a branch circuit, shunting the ordinary terminal apparatus, receives the rectified calling-wave and causes it to operate a local ringing-source As shown in the Figure, a circuit 10, shunting the input network 3 to the modulator M, intercepts ringing-current on the line L of a frequency of approximately sixteen cycles, and causes a relay 11 to bring a condenser 12 in or out of the main oscillatory circuit 4, 13 of the carrier generator G, thus changing the normal carrier-frequency and simultaneously interrupting the changed frequency at sixteen cycles. At the receiving end, the interrupted calling-frequency passes through a band filter RF, and is detected at D and amplified at A. The resultant impulses are collected by a tuned circuit 15, 16 branched across the ordinary speaking-channel RF1, and pass through a rectifier R to operate relays 18, 19, which disconnect the terminal network 3 and insert a ringing-source 2 in the line L to call the distant subscriber. Owing to the tuning of the circuit 15, 16 it has no appreciable shunting action on received speech currents which pass into the speech filter RF1 and through the network 3 into the low-frequency line L. A similar calling-arrangement may be applied to a standard four-wire circuit comprising push-pull modulators and rectifiers, the frequency-changing relay 11 being also adapted simultaneously to break or unbalance the push-pull couple. A system is also described in which an intermediate carrier frequency is independently generated and then modulated by low-frequency ringing-currents, the resultant complex being used to modulate the normal carrier-wave frequency.
Patent GB-673638-A (GB)
Title: Improvements relating to the formation of phosphate coatings on metal surfaces
IPC: C23C22/12
Filed: 1948-05-13
Abstract: Metallic surfaces are treated with aqueous acidic phosphate solutions containing 0.01-2 per cent of a water-soluble cellulose ether, e.g. the methyl or methyl-ethyl ether.  The phosphate solution may contain zinc dihydrogen phosphate with zinc nitrate-sodium chlorate or zinc nitrate-nitroguanidine accelerators, and may be applied by brushing or spraying.
Patent GB-162925-A (GB)
Title: A new or improved glass reflecting globe for electric safety or similar lamps
IPC: F21V7/04
Filed: 1920-05-13
Abstract: 162,925. Gulliford, A. G. May 13, 1920. Globes.-The upper part of a glass reflecting globe of a miners' electric safety or similar lamp is flat at the top and is formed internally with an inverted conical portion F. The edge D is domed or rounded and the flat surface AB may be silvered. The conical portion F may be provided with a recess C for a spring pressing on the. top of the lamp bulb.
Patent GB-515474-A (GB)
Title: Improvements in or relating to television transmission systems and the like
IPC: H04N7/04
Filed: 1938-05-04
Abstract: 515,474. Wireless signalling ; television. BEATTY, W. A. May 4, 1938, No. 13258. [Classes 40 (iii) and 40 (v)] Vision and synchronizing signals are transmitted as modulations of a carrier frequency within different amplitude ranges and the carrier frequency is varied from one value during vision signals to another value during synchronizing signals. The vision signal may be transmitted as an asymmetrical sideband and the change in carrier frequency during synchronizing may be used to indicate correct tuning at the receiver. The change in amplitude during synchronizing periods may be small, e.g., from 85 per cent. to 90 per cent. modulation, since it is accompanied by a frequency change. A small change in amplitude may be used for the line frequency while the frame frequency may be transmitted as a large change in carrier amplitude without further frequency change. Frequency modulation may be effected by a saturated diode or pentode valve in parallel with an oscillation circuit. The Figure shows an arrangement in which crystal oscillators 27, 28 feed a driving stage 31 through baffer stages 29, 30 which may be differentially controlled by the synchronizing pulses or by pulses derived from a saturated diode. Two stage variable impedances may be used to give two stages of frequency control for use in three colour or in stereoscopic television. At the receiver an auxiliary selector circuit may be provided to give outputs varying in accordance with the steps of the frequency modulation. The system may be used to increase the definition and a receiver is described for 875 lines which is also capable of receiving 441 lines transmitted by a double sideband system. The peak values of the synchronizing signals may be used for gain control.