baber/WOPTO huggingface dataset:
Patent GB-905906-A (GB)
Title: Improvements in or relating to the control of a.c. to d.c. converters
Inventor: JENKINS WALTER NORMAN
IPC: H02M7/15
Filed: 1957-09-19
Abstract: 905,906. Control of D.C. motors. BRITISH IRON & STEEL RESEARCH ASSOCIATION. Nov. 20, 1958 [Sept. 19, 1957], No. 29525/57. Class 38 (3). [Also in Group XXXV] A D.C. motor is supplied from a rectifying device, the output of which is varied by controlling the device to be conducting or non- conducting for each of a number of periods of equal duration, in accordance with a selected one of a number of different predetermined control patterns, and changing the selection of pattern to vary in steps of at least one whole period the number of conducting periods within a control cycle. The rectifying device may comprise an arrangement of discharge tubes or power transistors. The anodes 3 of a mercury arc converter are connected to the secondary windings of transformer 2 and the converter grids 5 are supplied with positive pulses from a generator 9, in opposition to a steady negative bias. The pulse generator (Fig. 3) consists of a chain of series connected delay units 12, each giving a time delay of one-sixth of the period of the supply voltage, and provided with recirculation loop controlled by switches S1 to S7. Output lines 13 are connected to selected points in the chain and to the respective grids 5, and manipulation of the switches results in various pulse patterns giving various outputs. For example, if switch S1 is in its upper position a firing sequence-4 - - - 2 - - - 6 - - of the respective anodes is produced. Switches S5 to S7 are provided to connect pairs of sub-chains in series, and each sub-chain preferably includes part of the preceding sub-chain-for example the twelfth unit of the first sub-chain forms the first unit of the second sub-chain. The switches may be programmed to operate in an automatic sequence to vary the output smoothly from minimum to maximum value. If two pulse patterns can be selected to give the same output, that pattern is chosen which gives the least undesirable effects in the mains. It is stated in the Provisional Specification that each control cycle may be divided into sub-cycles of sixteen cycles duration, in which the number of pulses in each successive subcycle is different. It is also stated that in such an arrangement each sub-cycle may be provided by a separate counter, the counters being connected in series, and each counter controlling a pair of rectifiers, e.g. the first and fourth of six rectifiers.
Patent GB-1279031-A (GB)
Title: Supply system for thermoplastic materials
Inventor: ROSEN SAMUEL RAYMOND
IPC: B05C11/10
Filed: 1970-06-18
Abstract: 1279031 Coating apparatus NORDSON CORP 18 June 1970 [18 June 1969] 29631/70 Heading B2L [Also in Divisions F1 F2 and G1] Spray coating apparatus comprises means for feeding molten thermoplastic adhesive to a spray gun including a heated tank for holding the adhesive a pump to feed the adhesive to hoses connected to the adhesive applicator and means for heating the hoses controlled by a temperature sensing bulb 180 located inside the hose. The adhesive is maintained in a tank A by means of thermostatically controlled heaters at a predetermined temperature. A single piston double acting pump B is provided in the tank and this is driven by means of an air. motor C controlled by a four way valve which in turn is moved to its operating positions by an over centre device 100 which is actuated by a plate 126 on a piston rod 55 of the pump. Molten adhesive is pumped through a passageway 13 and through a filter F and from there via a distribution manifold H to hoses I. The hoses I comprise a heat resistant plastics hose 168 surrounded by a stainless steel braid 169 in turn surrounded by a thick layer of silcone foam insulation 171 and a woven protective sleeve 173. The hose carried a power supply to the applicator and a heating element 165 controlled by a bulb type sensing element 180 which through a pipe 23 controls a thermostat 24.
Patent GB-1490410-A (GB)
Title: Green light emitting gap diode and production method for same
IPC: H01L21/208
Filed: 1975-07-15
Abstract: 1490410 Light-emitting PN diodes MATSUSHITA ELECTRIC INDUSTRIAL CO Ltd 15 July 1975 [15 July 1974] 29689/75 Heading H1K In a green light emitting gallium phosphide PN diode the P and N zones, both grown by liquid phase epitaxy, include nitrogen to provide trapping centres and the P zone is doped with zinc to give a net acceptor concentration adjacent the junction of 1À5 x 10<SP>18</SP> to 3À5 x 10<SP>10</SP> atoms/cc. In a preferred embodiment both zones are formed in a single run liquid phase epitaxy process in the apparatus described with reference to Fig. 1 (not shown), the melt containing gallium, polycrystalline GaP and sulphur doped GaP during growth of an N layer to give a net donor doping of 9 x 10<SP>16</SP>, nitrogen being introduced into the hydrogen flow through the apparatus after stabilization of the melt. To form the P layer grains of zinc contained in a side tube are tipped into the melt to give a zinc concentration therein of 0À18-0À35 mol per cent and after a period of melt stabilization growth is resumed at the same cooling rate of 3‹C/minute. In an alternative method after formation of the N layer a zinc source in the apparatus is vaporized by heating to dope the melt to a concentration determined by the zinc source temperature, while in another the P and N layers are grown from separate melts.
Patent GB-465156-A (GB)
Title: Improvements in or relating to dash pots
IPC: G01G23/08
Filed: 1935-10-29
Abstract: 465,156. Dashpots. FITZPATRICK, H. J. (Maatschappij van Berkel's Patent N.V.) Oct. 29, 1935, No. 29787.. [Class 108 (iii)] A dashpot particularly for use in weighing - apparatus comprises an outer cylinder 10 having a tapered member 12 fixed at its lower end and projecting into the open lower end of an inner cylinder 1 in which a piston 2 reciprocates, the outer cylinder 10 being adjustable axially relatively to the inner cylinder in order to vary the annular passage between the member 12 and the lower end of the inner cylinder and consequently the resistance of the dashpot. As shown, the upper end of the cylinder 1 is closed by a cap 4 which is screwthreaded externally to engage the internally-screwthreaded, upper end of the cylinder 10. Ports 15, 15a permit passage of liquid to and from the space 16 between the cylinders on reciprocation of the piston 2.
Patent GB-174425-A (GB)
Title: Improvements relating to ejector devices for utilizing the exhaust gases of internalcombustion engines to cause or promote circulation of water or air
IPC: F01N5/00
Filed: 1920-10-21
Abstract: 174,425. Tilbury, W., and Reeves, W. J. Oct. 21, 1920. Forced ventilation.-In a watercooling system for an internal-combustion engine, the circulation is assisted by the ejector action of exhaust gases discharged through a nozzle g into a right-angle pipe e by which the cooling water is returned to a radiator c. The gases entering the radiator are conveyed by a pipe i to the main exhaust pipe b. An additional ejector may be attached to the exhaust pipe for ventilating.
Patent GB-911819-A (GB)
Title: Polymerization of aldehyde by metal alkoxide
IPC: C08G2/00
Filed: 1960-08-30
Abstract: An aldehyde of formula <FORM:0911819/IV(a)/1> where R is an aliphatic or aromatic radical or a halogen substituted aliphatic or aromatic radical, is polymerized at below room temperature using as catalyst a metal alkoxide of formula Me(OR)x where M is a metal of valency x and R is an aliphatic or aromatic radical the two R not necessarily being the same when X is greater than one.  Specified aldehydes are acetaldehyde, propionaldehyde, butyraldehyde, monodi- and tri-chloroacetaldehydes, and benzaldehyde.  Specified alkoxides are aluminium isopropoxide, titanium tetraethoxide, sodium ethoxide, magnesium, calcium and zinc diethoxides and ferric triethoxide.  A solvent, e.g. hexane, may be used.  An apparatus in which aldehyde vapour is brought into contact with the catalyst is described. Specification 766,629 is referred to.
Patent GB-1190119-A (GB)
Title: Foam Plastics
Inventor: RICHERT KARL HARTWIG
IPC: C08G18/16
Filed: 1968-06-24
Abstract: 1,190,119. Polyurethane foams. FARBENFABRIKEN BAYER A.G. 24 June, 1968 [27 June, 1967], No. 29929/68. Headings C3C and C3R. Polyurethane foams are prepared by reacting a compound containing active hydrogen atoms, a polyisocyanate and water or other expanding agent in the presence of an emulsifier and/or foam stabilizer and in the presence of a catalyst which is a mixture or complex of an organic metal compound with a sila-amine (i.e. a compound containing both an amino group and a silicon atom), and optionally a tertiary amine. The active hydrogen containing compound is most suitably a polyether or polyester. Conventional polyisocyanates, expanding agents, emulsifiers and foam stabilizers are used. Complexes and/or mixtures of organic tin compounds with sila-amines or of organic tin compounds with mixtures of sila-amines and tertiary amines are preferably used. In examples the catalysts used are stannous octoate/2,2,4- trimethyl - 2 - silamorpholine, stannous octoate/1,3 - bis - (diethylaminomethyl)-tetramethyl disiloxane and stannous octoate/1,3-bis- (diethylaminomethyl) - tetramethyldisiloxane/ 2,2,4 - trimethyl - 2 - silamorpholine mixtures or complexes.
Patent GB-884412-A (GB)
Title: New 6-methyl-19-nor-steroids and process for the preparation thereof
IPC: C07J75/00
Filed: 1959-09-02
Abstract: The invention comprises steroids of the formula <FORM:0884412/IV (b)/1> (wherein Z is H(b OH), H(b OAcyl, R(b OH), R(b OAcyl) or = O in which R is a saturated or unsaturated aliphatic hydrocarbon radical of at most 4 carbon atoms) and the preparation thereof by oxidizing a d 5-3 : 17-dihydroxy-19-nor-androstene-3-mono-acylate or -3 : 17-diacylate to the corresponding 5a  : 6a -oxido-compound, preferably with a peracid, reacting the product with a methyl metal compound, preferably a methyl magnesium halide, to obtain 3b  : 5a  : 17b -trihydroxy-6-methyl-19-nor-androstane, treating this with an oxidizing agent, e.g. chromium trioxide to obtain the corresponding 3 : 17-diketone, treating this with a dehydrating agent, e.g. an inorganic acid in alcohol, to obtain the compounds of the above general formula, wherein Z is a keto group, and then, if desired, converting the 17-keto group into another group Z as defined above by known methods.  Such methods include (1) reduction, e.g. with a complex metal hydride, to a 17b -hydroxy group, during which process the D 4-3-keto group must be protected, for example by conversion to a 3-enol ether or a 3-enamine and released again after the reduction, for example with the use of an organic or inorganic acid; (2) concomitant alkylation and reduction to a 17b -hydroxy-17a -alkyl grouping, for example by means of a metal derivative of a saturated or unsaturated hydrocarbon such as a Grignard reagent, during which process the 3-keto group must be protected, e.g. by conversion to an enolester or enolether, and subsequently released, for example by treatment with an acid; (3) treatment with an alkyne in the presence of an alkali (including alkaline earth) metal or alkali metal compound, to give the 17b -hydroxy-17a -alkynyl compounds; (4) reduction of the products of (3) to the corresponding alkenyl or alkyl compounds; and (5) esterification of the 17b -hydroxy compounds to the 17b -acyloxy compounds, for example by means of the appropriate acid or an anhydride or halide thereof.  Examples are given and an extensive list of suitable esterifying acids is provided.  The preparation of D 4-3-keto-6-methyl-17b  - hydroxy - 17a  - methyl - 19 - nor - androstene by oxidising the 3 : 17 - diacetate of D 5-3b  : 17b -dihydroxy - 17a  - methyl - 19 - nor - androstene (obtained from the diol and acetic anhydride) to 3b  : 17b -diacetoxy-5a  : 6a -oxido-17a methyl-19-nor-androstane, reacting this with methyl magnesium bromide to form 3b  - 5a  : 17b -trihydroxy-6-methyl-17a -methyl-19-nor-androstane, oxidizing this to 3-keto-5a  : 17b -dihydroxy-6-methyl-17a -methyl-19-nor-androstane and dehydrating this, also is described, and the preparation of other 17a -hydrocarbon compounds by a similar method also is referred to. D 5-3 : 17-Dihydroxy-17a -alkyl-19-nor-androstenes, are prepared by converting 17a -alkyl-19-nor-testosterones into 3-enol acylates thereof and reducing the 3 : 4-double bond.
Patent GB-897668-A (GB)
Title: An improvement in means for grinding and/or polishing glass
Inventor: THREBAULT LOUIS
IPC: B24B7/24
Filed: 1958-09-18
Abstract: 897,668. Grinding glass. COMPAGNIE DE SAINT-GOBAIN. Sept. 18, 1958, No. 29960/58. Class 60. A rubbing tool 1 for grinding or polishing glass comprises a single driving member 3 which actuates the tool so that a point thereof describes a circular path 5, and means for preventing rotation of the tool about the point. The tool is formed with guides 6 on which slide members 7. Links 9 are at one end, connected to journals 8 on the members 7 and, at the other end, mounted on pivots 10 on a fixed frame 11. A link 12 is pivotally connected to each of the links 9 or to the journals 8 on the members 7 and serves to maintain the links 9 parallel to each other during orbital movement of the tool imparted from the crank 3 which is secured to a shaft 4 and a pin 2 on the tool. The crank may be positioned at the end of the tool or be displaceable longitudinally of the tool and dynamometers used to determine the position of the crank for least lateral reaction, and consequently wear, between the guides 6 and members 7. Expansion of the tool due to heating is accommodated by relative movement between the guides and members 7.
Patent GB-1333883-A (GB)
Title: Apparatus for controlling pressure in a well
IPC: E21B21/08
Filed: 1971-06-25
Abstract: 1333883 Boring earth &c EDWARDS ENG CORP 25 June 1971 [15 Oct 1970] 29973/71 Heading E1F [Also in Division F2] A system for controlling drilling mud pressure in a well bore comprises means for circulating mud through a drill string, a mud return line connected to the well bore, and means connected to the return line responsive to variations in mud flow and maintaining a substantially constant back pressure on the mud. The means connected to the return line comprises a choke 18 having an inlet 20 receiving mud from the return line and an outlet 21 discharging to the mud tank. A valve-head 25 cooperates with an annular projection 23 and is connected to a piston 29 subjected on its lower side to a substantially constant pressure from an accumulator 30. The pressure from the accumulator which is of the same magnitude, as the back pressure is indicated on a gauge 40.
Patent GB-946032-A (GB)
Title: Improved lubricating oil compositions
Inventor: NACSON GEORGE
IPC: C10M133/00
Filed: 1961-08-18
Abstract: A succinimide of the formula: <FORM:0946032/C3/1> where R is a polyisobutenyl radical and X is a radical derived from tetraethylene pentamine is prepared as follows:-  Polyisobutylene having a molecular weight of 615 and a bromine number of 21 is heated with maleic anhydride to form polyisobutenyl succinic anhydride which is then reacted with tetraethylene pentamine.  The product is used as an additive for lubricating oils (see Division C5).ALSO:A lubricating oil composition comprises a lubricating oil and minor proportions of (A) a succinimide having the formula <FORM:0946032/C3/1> where R is a polycycloalkyl, polyalkyl or polyalkenyl radical having 30-200 carbon atoms and X represents one of the groups <FORM:0946032/C3/2> wherein R1 is an alkylene radical, R2 and R3 are alkyl radicals and n is an integer of from 1 to 6; and (B) an alkylated bis-phenol, which preferably has the formula <FORM:0946032/C3/3> where X represents a bridge selected from -S-, -S-S-, -Se-, -S-CH2-, -CH2-S-CH2-, -CHR-, -CR2-, -(CH2)m-, -NH- and -O- groups, R is a methyl or ethyl radical, and m is an integer of 1-3. Additives (A) and (B) are extensively exemplified. A small proportion of di-imides of succinic acid, formed during the preparation of the mono-imides (A), may be present.  The lubricating oil may be mineral or synthetic, e.g. naphthenic base, paraffinic base and mixed base hydrocarbon oils, oils derived from coal products, alkylene polymers, alkylene oxide polymers and esters thereof, dicarboxylic acid esters, liquid ester or phosphorus, alkyl benzenes, polyphenyls, alkyl biphenyl ethers, or organic esters of silicic acid and silicon-containing polymers.  These oils are exemplified. Optional additives referred to are esters of phosphoric and phosphorous acid (e.g. trichloroethyl phosphite, tricresyl phosphate, &c.), silicone polymers, polymeric acrylic esters (e.g. lauryl methacrylate/N-vinyl pyrrolidone copolymer), dibenzyl disulphide, the condensation product of maleic anhydride and long-chain alkenes, acidless tallow, and peroxidized aromatic extracts, all of which perform their customary functions.
Patent GB-520049-A (GB)
Title: Improvements in or relating to the construction of walls
IPC: E04B2/58
Filed: 1938-10-17
Abstract: 520,049. Walls. HURDEN, E. Oct. 17, 1938, No. 30036. [Class 20 (iv)] A double wall comprises inner and outer walls A, B formed of asbestos-cement sheets bolted or otherwise fastened together, one or both of these walls being recessed at intervals to provide a series of hollows within the double wall; the spaces may be wholly or partially filled with concrete, sand, or other material C. The two walls are secured together and to metal purlins F, Fig. 1, by bolts D engaging clips E on the purlins. The outer wall structure A may be formed with large recesses J, and the other structure B may have smaller recesses H; or both walls A, B may have similar registering recesses ; or the inner wall sheets B may be flat. Metal distance-pieces may be provided between the two walls at the recesses so as to increase the wall thickness. In another form, Fig. 6, the supporting structure may be disposed between .the sheets A, B. This structure may be a T-bar M disposed at the joint, or a channel-iron N disposed between joints. The sheets may overlap at the horizontal and vertical joints. A smooth finish may be produced at the recessed portions of the sheets by means of cement P. Specifications 152,173 and 246;949, [both in Class 20 (iv)], are referred to.
Patent GB-1334748-A (GB)
Title: Electrolytic honing tools
IPC: B23H5/06
Filed: 1971-06-28
Abstract: 1334748 Abrasive tools SOC ANON AUTOMOBILES CITROEN 28 June 1971 [3 July 1970] 30107/71 Heading B3D [Also in Division C7] A tool for electro-chemical honing of spherical surfaces comprises an electrode tool 2 having a part-spherical concave face 2a; an abrasive ring 3 having a working surface adjacent the edge of the part-spherical face 2a and lying inside the imaginary sphere defined thereby; a passage 10 through the tool for delivering electrolyte to the work-face; a sensing blower nozzle 8 positioned on the longitudinal axis of the tool for delivering gas under pressure, e.g. compressed air, adjacent the workpiece; and means for measuring the back pressure in the nozzle. In operation the tool 1 is rotated about axis 16 and, as honing takes place, the tool approaches the workpiece, the back-pressure in the nozzle increases, and at a given value back-pressure the tool is retracted. The abrasive face 3 is diamond-faced and insulated from the tool by insulating material 4.
Patent GB-844961-A (GB)
Title: Data storage apparatus
IPC: G11B5/48
Filed: 1957-09-25
Abstract: 844,961. Electric digital-data-storage apparatus. RADIO CORPORATION OF AMERICA. Sept. 25, 1957 [Oct. 15, 1956], No. 30133/57. Class 106 (1). [Also in Group XXXIV] In data storage apparatus comprising a member having a magnetically responsive surface and another member having one or more transducer devices for coupling to the surface, pressurized aeriform fluid is supplied between closely adjacent surfaces of the members whereby one of the members is rotatably supported from the other. As shown, the members comprise a magnetically coated drum 26, Figs. 1 and 3, and sleeve 12 preferably of the same material, e.g. aluminium. The drum is fixed to the armature 32 of an electric drive motor which is separated from the drum by a magnetic shield 36. The sleeve is secured to a base 16 containing a chamber 84, Fig. 3, which receives pressurized fluid from inlet 20. This chamber communicates through channels 86 with thrust bearing space 48 to take the thrust load of the drum 26 and armature 32, and through channels 90, 92 to a radial bearing space to maintain the drum centrally in the sleeve 12; cut-away drum portions provide relief spaces, such as 96, 105, which are coiinected by radial channels to a central axial channel 100 in the drum which communicates via relief space 101 and base channel 104 with exhaust port 22. A further fluid thrust bearing may be provided between the top of armature 32 and end cap 40. In another arrangement, the fluid is used to cool the motor and is exhausted through a port in cap 40. The transducer heads 50, fixed in apertures in sleeve 12, each comprise a plate section 58, Fig. 5, and a cylindrical portion 60 ending in a rectangular recess in which a laminated core 68 is supported, the pole ends being pressed against a gap spacer by springs 71. Windings 54 are brought out through axial opening 62, the recess and opening being filled with resin. Upon initial assembly, after all the transducer heads have been mounted in the sleeve, but before the drum has been inserted, a grinding wheel is inserted into the sleeve bore so as to shape the ends of the cores and portions 60 so that they are substantially flush with the sleeve surface. A specific example is given in which the spacing between the heads and the drum is 0.0005 ins. and air is supplied at 50 pounds/sq. in. In a further embodiment (Figs. 6 and 7, not shown), the drum is mounted horizontally, and separate ports are provided for supplying fluid to the thrust and radial bearing spaces.