Patents Assigned to L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes
  • Welding torch with non-consumable electrode and double shielding gas flow and the relevant welding process
    Patent number: 4527038
    Abstract: In order to improve electric arc penetration of an arc welding torch, the angles of convergence .alpha. and .beta. of a sleeve and a nozzle of the torch are selected within an area which is inscribed in a quadrangular figure defined by the coordinates (.alpha., .beta.) with corners, or apices, at the four following points:______________________________________ .alpha. = 17.5 degrees S'.sub.1 : .beta. = 27.5 degrees .alpha. = 7.2 degrees S'.sub.2 : .beta. = 20 degrees .alpha. = 7.5 degrees S'.sub.3 : .beta. = 15 degrees .alpha. = 17.5 degrees S'.sub.4 : .beta. = 7.5 degrees ______________________________________The disclosed arc welding torch is favorably employed in an inert gas welding process.
    Type: Grant
    Filed: February 11, 1983
    Date of Patent: July 2, 1985
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Francis Cuny, Louis Auzary
  • Process of producing metal powders from a molten metal material
    Patent number: 4521244
    Abstract: A cryogenic fluid in the liquid phase is put in contact with a metal material maintained in a closed treating vessel, the cryogenic fluid which contains the solid particles formed is exhausted from the vessel, and the solid particles are separated from the cryogenic fluid and collected. The metal material is heated by induction heating with a high-frequency current and maintained in levitation in the cryogenic liquid. The process is applicable to the production of ultra-fine powders from metals which are only slightly volatile.
    Type: Grant
    Filed: April 24, 1984
    Date of Patent: June 4, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Albert-Gilbert Goursat, Gilles Vernet, Jean-Francis Rimbert, Jean Foulard, Thierry Darle, Jean Bigot
  • Method of carburizing workpiece
    Patent number: 4519853
    Abstract: The method of carburizing steel workpieces comprises loading workpieces to be carburized in a furnace and maintaining them in a carbon enriching atmosphere comprising carbon monoxide, hydrogen and nitrogen. The treatment comprises a first phase carried out at a temperature from 850.degree. C. to 1050.degree. C. followed by a second phase carried out at a temperature from 700.degree. C. to 950.degree. C. During the first phase an atmosphere is used having a carbon potential from about 1.1% to about 1.6% by weight and during the second phase the amount of nitrogen in the atmosphere is increased from two to thirty times so that the carbon potential for the second phase is at least about 0.5% by weight less than the carbon potential for the first phase.
    Type: Grant
    Filed: May 23, 1983
    Date of Patent: May 28, 1985
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Michel Kostelitz, Philippe Queille
  • Process for producing solid metal particles from a bath of metal
    Patent number: 4518421
    Abstract: The process concerns a selective refining of molten metals or alloys contained in a closed treatment container in the form of a bath 10. A solid or liquid cryogenic body 13 is brought into contact with the surface of the bath of metal 10 so as to convert, by evaporation-condensation, the vapors (vz) of the impurity or impurities to be eliminated from the bath into solid particles (pz) entrained by the vapors (vf) of the cryogenic body, and the bath of metal 10 is simultaneously stirred.
    Type: Grant
    Filed: May 1, 1984
    Date of Patent: May 21, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Jean Foulard, Jean F. Rimbert, Gilles Vernet, Albert-Gilbert Goursat
  • Method and installation for separating a composite gas by adsorption
    Patent number: 4512779
    Abstract: In a method comprising an isobaric production phase, a co-current depressurization phase, optionally carried out in a plurality of stages, a counter-current elution phase and a counter-current repressurization phase, optionally carried out in a plurality of stages, the successive balancing phases between two adsorption columns 1, 2, 3, 4 are carried out by passage in an auxiliary column 46, 70 with flow in opposite directions of the gaseous currents corresponding to two successive balancings.
    Type: Grant
    Filed: October 31, 1983
    Date of Patent: April 23, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Leon Hay
  • Cryogenic liquid distributing device
    Patent number: 4506512
    Abstract: The device comprises a reservoir having a double wall 4-5 with an inlet pipe 24 having a valve 31 whose movable valve member 30 is connected to a float 35 and a drawing-off pipe 41 having a valve 45 whose valve member 50 is connected to a control rod 52. The drawing-off valve 45 is placed in the thermal insulation space of the reservoir. Application in the distribution of low and usually intermittent flows of cryogenic liquids and in particular nitrogen or argon for rendering inert pouring jets employed in metallurgy.
    Type: Grant
    Filed: January 10, 1984
    Date of Patent: March 26, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Pierre Delacour, Roger Prost
  • Process for producing a biochemical vaccine against Salmonella infection
    Patent number: 4503036
    Abstract: A bacterial vaccine against Salmonella fevers, typhoid and paratyphoid fevers is obtained by fermentation, extraction and purification, vaccinating membrane antigens being extracted by putting the bacterial residue, obtained by centrifuging, in contact with a solvent of the tris (hydroxyalkyl) aminoalkane class, with stirring, at lowered temperature, pH adjusted between 8.4 and 8.6 for a period of at least some 60 hours, then, separated by decanting, followed by purifying the antigens and fractionating by ultrafiltration, and then freeze-drying the vaccinating antigen fraction. Such vaccinating antigen fraction has a molecular weight greater than 50,000, preferably 300,000, and is used to vaccinate humans and animals.
    Type: Grant
    Filed: December 7, 1982
    Date of Patent: March 5, 1985
    Assignee: L'Air Liquide, Societe Anonyme Pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Philippe Girardon, Jean Amen
  • Method and apparatus for in-situ mining by leaching ores containing metal values
    Patent number: 4498705
    Abstract: An oxygenated lixiviant is transported down an injection pipe into the leach zone at the bottom of an injection pipe, the lixiviant leaches the ore and the pregnant lixiviant containing metal compounds is recovered through a recovery pipe. The metal compounds are separated from the lixiviant and the lixiviant is regenerated, reoxygenated and recycled. The pressure of the lixiviant at the downstream end of the injection pipe is substantially equal to the pressure of the lixiviant at the upstream end thereby permitting maximum oxygenation without any degassing.
    Type: Grant
    Filed: March 11, 1983
    Date of Patent: February 12, 1985
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventor: Jacques Roussel
  • Oxy-fuel burners
    Patent number: 4494923
    Abstract: The invention relates to the electric ignition of oxy-fuel burners, as well as to the detection of the flame of these burners.A spark is induced between an electrode and the body of the burner, the said electrode being situated in the area of the recirculation flows having a relative proportion of oxygen and fuel comprised between the lower and upper limits of flammability, close to the said upper limit.The invention is applicable to burners supplied with a gaseous fuel.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: January 22, 1985
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude Et L'Exploitation Des Procedes Georges Claude
    Inventors: Paul Guillaume, Luc Vezin, Bernard Dubi
  • High-frequency arc striking device and auxiliary electrode of an electric welding or cutting arc
    Patent number: 4493969
    Abstract: A high frequency-high voltage generator supplies current, on one hand, to a first arc striking circuit connecting a main electrode to an auxiliary electrode and, on the other hand, to a second arc striking circuit which connects one of the two electrodes to the workpiece to be treated. In this way there is achieved a striking of the arc in two stages. This ensures high reliability regardless of the nature of the material from which the workpiece is made regardless of the protecting gas used, in particular for the TIG welding of light alloys in a helium atmosphere. The device is applicable to an automatic TIG welding.
    Type: Grant
    Filed: November 9, 1983
    Date of Patent: January 15, 1985
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Pierre Legrand, Michel Arnout
  • Ternary fuel having fairly constant acetylene content in the liquid and vapor phase
    Patent number: 4490152
    Abstract: A fuel mixture, which contains by volume 15 to 25% acetylene, 5 to 17% C.sub.3 hydrocarbon, preferably propylene, and the remainder ethylene. This ternary fuel having a fairly constant acetylene content, is suitable in applications pertaining to assembly, flame heat treatment, flame metal spraying and disintegration of inorganic compounds or cements.
    Type: Grant
    Filed: February 25, 1982
    Date of Patent: December 25, 1984
    Assignee: L'Air Liquide-Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Maurice Bruni, George Duboz
  • Method and apparatus for gas liquefaction
    Patent number: 4486210
    Abstract: Method and apparatus for liquefying a gas such as natural gas, utilizing at least one cycle fluid comprising a refrigerating mixture, with at least one first principal cycle fluid under a low pressure in countercurrent heat exchange with the gas which is to be liquefied and with at least one second principal cycle fluid under a high pressure. At least one secondary cycle fluid is obtained by withdrawing a portion in liquid phase from the refrigerating mixture at the high pressure and is expanded to the low pressure and is then added to the first principal cycle fluid.
    Type: Grant
    Filed: August 12, 1983
    Date of Patent: December 4, 1984
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Pierre Gauthier
  • Method and device for injecting a liquefied pressurizing gas into containers
    Patent number: 4485854
    Abstract: Containers 6, adapted to receive a product which does not of itself give off a gas, receive an amount of a liquefied pressurizing gas from a tank 1 provided with an outlet nozzle 3. The containers 6 are aligned on a machine 7 which conveys them, in the direction of the alignment, under the tank 1 which is provided with trunnions 2 and is oriented in such manner as to be pivotable about an axis parallel to the direction of alignment. A control device 8 regulates the angular position of the tank 1. The amount of the liquefied pressurizing gas received in each container depends on the angular position of the tank relative to the vertical position.
    Type: Grant
    Filed: August 18, 1983
    Date of Patent: December 4, 1984
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Alain Roullet
  • Device for freezing biological products
    Patent number: 4485641
    Abstract: A freezing device for biological products comprises an impeller arranged at the top of a sleeve located above a basin of liquid nitrogen. The impeller causes a rising flow of nitrogen vapors within the sleeve and a descending flow outside it, the impeller and sleeve being arranged within a casing. When cooling is completed, the sleeve is lowered into the basin of liquid nitrogen. The invention is applied to the freezing of biological products stored in tubes, ampoules, phials, or straws arranged at the base of the sleeve.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: December 4, 1984
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Nicole Angelier, Francois Colomb
  • Method and apparatus for the protection of molten metal flows in furnaces
    Patent number: 4480770
    Abstract: This invention relates to the protection of the teeming flow or stream of molten metal contained in a vessel and passing through a plate-type valve or cut-off device of the kind comprising a stationary plate and a displaceable plate that is provided with at least one output nozzle. A gas which is substantially inert with respect to the metal and has a pressure slightly higher than atmospheric pressure is fed into the aforesaid device, and this gas surrounds the metal while the latter passes through the said device, in such manner as to isolate the same from the ambient air by an uninterrupted protective gaseous barrier.
    Type: Grant
    Filed: August 19, 1981
    Date of Patent: November 6, 1984
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Albert-Gilbert Goursat, Thierry Hersant, Jacques Nicolas
  • Gasification of coal
    Patent number: 4479540
    Abstract: This invention relates to the gasification of coal. An oxygen jet having a pointed flame is engendered in situ, so as to strike the coal with a sheath of steam. The resultant fuel gas is drawn off while flowing in counterflow with the jet of oxygen and is brought to the surface through the same bore which had served the purpose of supplying oxygen. The invention is particularly applicable to the underground gasification of coal in situ.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: October 30, 1984
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventor: Maurice Grenier
  • Atmospheric heaters
    Patent number: 4479359
    Abstract: The invention relates to an atmospheric heater particularly for cryogenic fluids. Examples of cryogenic fluids which can be heated are liquified nitrogen and liquified oxygen.
    Type: Grant
    Filed: February 6, 1984
    Date of Patent: October 30, 1984
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventor: Pierre Pelloux-Gervais
  • Cleaning or stripping of coated objects
    Patent number: 4474199
    Abstract: The present invention relates to the cleaning or stripping of coated objects. The coating is dissolved in a receiver tank rendered inert by means of nitrogen, by a solvent and the mixture of solvent and coating product is transferred into a thickening tank swamped by a heated nitrogen flow. The nitrogen-solvent mixture is separated by cooling and condensation of the solvents extracted. The invention is applied to the stripping of objects coated with paints and varnish.
    Type: Grant
    Filed: November 9, 1982
    Date of Patent: October 2, 1984
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Bernd Blaudszun
  • Preparation and use of high porosity silicocalcareous mass
    Patent number: 4467040
    Abstract: A high porosity silicocalcareous mass is obtained by using in at least partial replacement of the usual silica, amorphous ultrafine synthetic silica particles having a specific surface between 150 and 300 m.sup.2 per gram, and a high absorption capacity, and optionally adding nonreactive synthetic fibers of either inorganic or organic origin to the mixture containing the particles. The high-porosity silicocalcareous mass can be used as a lining material for containers, which are intended for storing liquified or dissolved gases and also as an insulation material, such as sound insulation in building construction.
    Type: Grant
    Filed: May 11, 1982
    Date of Patent: August 21, 1984
    Assignee: L'Air Liquide - Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Maurice Bruni, Georges Delode, Rolland Perraudin
  • Silicocalcareous mass with high porosity and its preparation
    Patent number: 4467041
    Abstract: A silicocalcareous mass with high porosity is obtained by using, in at least partial replacement of the usual silica, ultrafine synthetic silica with a large specific surface of 200 to 500 m.sup.2 per gram to a paste of lime and silica, and possibly adding nonreactive synthetic fibers of organic or inorganic origin. The silicocalcareous mass with high porosity can be used in the field of lining materials for containers intended to store dissolved gases and in the field of insulation materials.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: August 21, 1984
    Assignee: L'Air Liquide - Societe Anonyme pour l'Etude et l'Exploitation des Procedes George Claude
    Inventors: Maurice Bruni, Georges Delode, Rolland Perraudin