Patents Assigned to L'Exploitation Des
  • Process for producing low-concentration gas mixtures, and apparatus for producing the same
    Patent number: 5054309
    Abstract: This invention relates to a process for producing gas mixtures by a plurality of dilution steps of a high concentration standard gas with a high purity diluent gas. According to the invention, as soon as the high purity diluent gas is generated, no further contaminants such as gaseous impurities are added during the further mixing of diluting steps of the process. Only orifices or needle valves are used in the mixing or diluting lines while mass flow controllers and pressure regulators are placed upstream, at the output of the gas sources and/or downstream, i.e. in the gas-venting lines. The invention particularly applies to trace analysis of gas with Atmospheric Pressure Ionization Mass Spectrometry.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: October 8, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Jacques Mettes, Takako Kimura, Michael Schack
  • Tundish for continuous casting of steel
    Patent number: 5054749
    Abstract: Tundish for continous casting of steel, of the type comprising a permanent refractory, cast on a frame of sheet metal defining the outer wall of the tundish and on which a refractory wear has been laid. In the body of the permanent refractory, there is provided a gas duct which penetrates into the permanent refractory at the level of the upper edge of the tundish and extends to the bottom of the tundish into a gas distribution chamber, which is covered with a surface distributed gas permeable plate. Application to the continuous casting of steels for tundish between casting ladle and ingot molds.
    Type: Grant
    Filed: June 14, 1990
    Date of Patent: October 8, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Francois Weisang, Pierre Charlery-Adele
  • Process and apparatus for the recovery of the heaviest hydrocarbons from a gaseous mixture
    Patent number: 5053067
    Abstract: Part of the hydrogen from the gas treated, which is for example a residual gas from petroleum refinery, is first removed. The remaining mixture is introduced at an intermediate level of a distillation column which includes a head condenser operating at a temperature TF of the order of -40.degree. C. or more. The hydrogen content of said remaining mixture is selected so that the dew point of the residual gas which is removed at the top of the column is slightly higher than the temperature TF. The heavy hydrocarbons are collected at the base of the column.
    Type: Grant
    Filed: March 9, 1990
    Date of Patent: October 1, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Denis Chretien
  • Process and equipment for the heat treatment, before hardening, of metallic pieces by cementation, carbonitridation of heating
    Patent number: 5045126
    Abstract: The invention is exclusively concerned with heat treatments before hardening, of metallic pieces, by cementation, carbonitridation and heating. The process concerns the feeding of a non muffle heat treatment furnace with various components including nitrogen which is produced by an adsorption or selective permeation generator and which has a residual oxygen content of the order of 2%. According to the invention, after the furnace has ceased to be in operation for a substantial period of time, it is reconditioned by injecting purer nitrogen which has a residual oxygen content lower than 0.3% and which is produced by said generator, adjusted at a lower extraction rate.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: September 3, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Alain Comier, Patrice Ollivier, Jean-Marc Viant
  • Method of chemically fixing liquid aqueous sludge by means of a pozzolanic reaction
    Patent number: 5043081
    Abstract: A liquid aqueous sludge is transferred into a cylindrical-conical tank and gitated by blowing in air through a downwardly extending tube. A closed circulation of sludge is established between this main tank and a reagent tank by means of a recycling pump. The reagent tank overflows into the main tank. Chalk is added to the reagent tank and a pozzolanic material is added to the main tank. When the mixture of dilute sludge, chalk and possolanic material is homogeneous, it is transferred to a filter press by means of a further pump. The filter cake is collected for final storage or discharged to set slowly.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: August 27, 1991
    Assignee: Agence Nationale pour la Recuperation et l'Elimination des Dechets
    Inventor: Francois Colin
  • Process and device for regulating a flow of liquid CO.sub.2, and application thereof in a cooling tunnel
    Patent number: 5040374
    Abstract: According to the process, there is maintained in a conduit (3), on the downstream side of a valve (5), up to the vicinity of the point A of injection of the CO.sub.2, an intermediate pressure (PI) higher than the pressure (PT) of the triple point of the CO.sub.2. Application in the treatment of waste waters or the deep freezing of food.
    Type: Grant
    Filed: December 27, 1989
    Date of Patent: August 20, 1991
    Assignee: L'air Liquide, Societe Anonyme pour l'etude et l'Exploitation des Procedes Georges Claude
    Inventor: Patrick Micheau
  • Apparatus for supplying a gas to a gas utilizing network
    Patent number: 5033502
    Abstract: The gas which comes from a source passes through a regulating valve, then through a heat exchanger and is sent to the network through a production duct. The heat exchanger thus acts as a muffler. Application to the supplying of gas from air separation.
    Type: Grant
    Filed: July 9, 1990
    Date of Patent: July 23, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Maurice Bosquain, Jean-Yves Lehman
  • Process for condensing at least one epoxide on at least one cyclic anhydride in the presence of a catalyst consisting of at least one titanium nitrogenous complex
    Patent number: 5030711
    Abstract: The invention relates to a process for condensing at least one epoxide on at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst consisting of at least one titanium nitrogenous complex of the formula (I) Ti(OR.sup.1).sub.m (OR.sup.2 ).sub.n (OR.sup.2 ).sub.p Lg in which R.sup.1, R.sup.2 and R.sup.3 each independently represents one hydrocarbon group, L represents the remainder of a nitrogenous compound, the sum of m+n+p+q is 4, q is an integer from 1 to 4 and m, n and p are independently each 0 or 1. The process allows for obtaining a perfectly alternating polyester.
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: July 9, 1991
    Assignees: Institut Francais du Petrole, L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, ELF France
    Inventors: Valerie Bagrel, Jacques Garapon, Remi Touet, Catherine Huet, Bernard Damin
  • Process of restructuring a group of finely divided particles
    Patent number: 5030278
    Abstract: Process of restructuring a group of finely divided particles, of granulometries lower than 100 microns, wherein the particles to be restructured are placed in a bath of cryogenic liquid which is inert with respect to the particles, the operation of restructuring is allowed to proceed after which the cryogenic liquid is withdrawn for example by evaporation. Applications to the production of metallic alloys, special polymers, paints, inks, carbon black, special ceramics and pharmaceutical or food products.
    Type: Grant
    Filed: April 12, 1990
    Date of Patent: July 9, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes
    Inventor: Pierre Karinthi
  • Method of forming a helical waveguide using a deposit screen
    Patent number: 5030329
    Abstract: A method for forming a helical waveguide uses a deposit screen such as tape to prevent the deposit of unwanted material between the turns of the helix. The waveguide is formed by electroplating of nickel on a mandrel. The mandrel has raised portions similar to a screw on which the waveguide is formed. The deposit screen is placed in the recessed areas between the raised areas on the mandrel to prevent the mandrel from being plated in these areas. This prevents the turns of the helix from touching each other. The resultant helix is easily removed without damage to the waveguide or mandrel.
    Type: Grant
    Filed: March 17, 1989
    Date of Patent: July 9, 1991
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Rudy H. Haidle, Robert I. Altkorn, Michel E. Marhic
  • Process for condensing at least one epoxide on at least one cyclic anhydride in the presence of a catalyst consisting of at least one titanium complex
    Patent number: 5019643
    Abstract: A process for condensing at least one aliphatic epoxide having at least 8 atoms of carbon in its molecule on at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst consisting of at least one titanium complex of general formula (I) Ti(OR).sub.2 (L).sub.2 in which each R group independently represents one hydrocarbon group with 1 to 10 atoms of carbon and each L group represents a ligand of the diketonic beta type or of the keto-ester beta.
    Type: Grant
    Filed: March 12, 1990
    Date of Patent: May 28, 1991
    Assignees: Institut Francais du Petrole, L'Air Liquide Societe Anonyme pour L'Etude et L'Exploitation des Procedes Georges Claude, ELF France
    Inventors: Valerie Bagrel, Jacques Garapon, Remi Touet, Catherine Huet, Bernard Damin
  • Valve assembly for packing fluid under pressure and packing provided with such assembly
    Patent number: 5018552
    Abstract: The valve assembly for non-returnable packing comprises a valve housing including a main valve and an auxiliary valve the latter being initially kept in opened position through a resilient locking device which is unlocked, at the end of a first filling through a displacement of the main valve beyond its position of normal opening under the action of a long travel filling tap. The auxiliary valve is then forced to rest on its seat by means of a spring with low calibration. Any depression caused by tapping would provoke the opening of the auxiliary valve, while any overpressure resulting from filling would hit the auxiliary valve in a closed position.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: May 28, 1991
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
    Inventors: Jean-Marie Politi, Lennart Franz
  • Process for producing a glass-metal connection
    Patent number: 5004489
    Abstract: The invention concerns glass-metal sealing comprising effecting on a metallic piece, in particular an alloy based on iron and nickel or iron, nickel and cobalt, first of all a decarburization under an atmosphere, at a temperature of between 950.degree. C. and 1,150.degree. C., formed by hydrogen (10 to 99%), water vapor (1 to 8%), with a ratio hydrogen/water vapor higher than five, the possible remainder being nitrogen, then an oxidation under an atmosphere formed by an inert vector gas such as nitrogen, either at a temperature of 600.degree. C. to 800.degree. C. and with a water vapor content of 8% to 2%; or at a temperature of 900.degree. C. to 1,100.degree. C. and with a water vapor content of 4% to 0.5%; then establishing the connection.
    Type: Grant
    Filed: February 22, 1990
    Date of Patent: April 2, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Frederic Rotman, Yannick Rancon, Philippe Queille, Michel Olivier
  • Joule-Thomson cooler
    Patent number: 5003783
    Abstract: A closure member (16) of the cooler is controlled by a bulb actuator (18) which defines an auxiliary gas volume (24) located in the cold part of the cooler and connected to a chamber (21) of very much larger volume located in the warm part of the cooler. Application in the cooling of infrared ray detectors.
    Type: Grant
    Filed: March 15, 1990
    Date of Patent: April 2, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Serge Reale
  • Cutting torch for iron and steel metallurgy
    Patent number: 5002261
    Abstract: The invention concerns a cutting torch for iron and steel metallurgy which is provided with two oxygen cutting ducts, ending in two housings, for receiving two cutting inserts, or a heating nozzle and a cutting insert. In this manner, there is obtained a torch which may very rapidly be converted into a cutting torch with high heating capacity and single cutting jet, or into a cutting torch with high cutting speed provided with two cutting inserts.
    Type: Grant
    Filed: January 8, 1990
    Date of Patent: March 26, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Michel Arnout, Didier Lasnier, Eric Dufour
  • Process for manufacturing fatty alcohols
    Patent number: 5001284
    Abstract: In a process for manufacturing fatty alcohols comprising hydrogenating the corresponding fatty acid methyl esters, the hydrogen used for the hydrogenation reaction is regenerated from impure methanol as a by-product of the reaction. The impure methanol recovered from the hydrogenation reactor is conducted to a steam reformer reactor, from whence the regenerated hydrogen is recycled back to the hydrogenation reactor.
    Type: Grant
    Filed: October 12, 1989
    Date of Patent: March 19, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Rene Dupont, Laurent Ferenczi, Guy Simonet
  • Gas mixture and welding method
    Patent number: 4999474
    Abstract: Gas mixture suitable for MAG welding at a high current using a rod filled with non-alloyed or low alloy steels, comprises 20 to 65% argon, 5 to 20% helium, and at least 30% CO.sub.2.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: March 12, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Jean-Pierre Schultz, Jean Soler, Daniel Nicoud
  • Process for condensing at least one epoxide on at least one cyclic anhydride in the presence of a titanium-based catalyst
    Patent number: 4997910
    Abstract: The invention relates to a process for condensing at least one epoxide on at least one cyclic anhydride of a dicarboxylic acid in the presence of a catalyst consisting of at least one titanium peroxidic complex of the peroxo type of the A form ##STR1## Said process allows to obtain a perfectly alternate polyester.
    Type: Grant
    Filed: December 7, 1989
    Date of Patent: March 5, 1991
    Assignees: Institut Francais du Petrole, L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, Elf France
    Inventors: Jacques Garapon, Remi Touet, Catherine Huet, Bernard Damin
  • Process for heat treatment under a gaseous atmosphere containing nitrogen and hydrocarbon
    Patent number: 4992113
    Abstract: Process for the heat treatment of low-alloy steels at temperatures higher than 600.degree. C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon C.sub.x H.sub.y and optionally hydrogen, with a control of the atmosphere. According to the invention, the composition of the residual species CH.sub.4, CO, H.sub.2 O, and the temperature of the gaseous mixture in the furnace are controlled in order to control the carburization and the decarburization of the treated steels.
    Type: Grant
    Filed: August 22, 1990
    Date of Patent: February 12, 1991
    Assignee: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Pascal Baldo, Eric Duchateau
  • Process for producing steel having a low content of nitrogen in a ladle furnace
    Patent number: 4990183
    Abstract: The present invention relates to a process for producing steel in a ladle furnace in which the molten steel is stirred by injection of an inert gas in the lower part of the furnace. According to the invention, the stirring of the bath of steel is effected by the injection of gaseous argon so as to distribute in a homogeneous manner the additives added and the metal temperature in the course of the treatment, while there is simultaneously injected liquid argon above the surface of the bath in the region of intumescence. In this way, substantially any increase in the concentration of nitrogen of the bath of steel in the course of the treatment is avoided. In some cases, and in particular when wires of the type filled with silico-calcium are employed, a reduction in the concentration of nitrogen in the bath of steel is found.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: February 5, 1991
    Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, Liquid Air Corporation
    Inventors: Sara H. Anderson, Noel Lutgen, Jean Foulard