Patents Assigned to L'Exploitation Des
  • Patent number: 6402809
    Abstract: A process and a system for purifying gas, such as air, before cryogenic distillation, in which at least one energy parameter, chosen from the flow rate of the regeneration gas entering and/or leaving at least one adsorber, the duration of the regeneration step and the regeneration temperature of the regeneration gas entering at least one adsorber, is controlled, modified and/or regulated depending on at least one operating condition chosen from the pressure of the gas to be purified entering and/or leaving at least one adsorber, the flow rate of the gas to be purified entering and/or leaving at least one adsorber, the temperature (Ta) of the gas to be purified entering at least one adsorber and the content of impurities contained in the gas to be purified entering at least one adsorber and depending on the thermal profile of the heat front output by at least one adsorber at the end of regeneration.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: June 11, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Christian Monereau, Didier Miniscloux, Alain Combier
  • Patent number: 6398104
    Abstract: Provided is a method of operating an apparatus for inerting a wave soldering installation having a solder bath and a conveying system for producing one or more solder waves comprising an immersion box which is closed on all sides, shaped like a frame, can be immersed in the solder bath and which has porous pipes to distribute nitrogen, the pipes being arranged inside the immersion box in housings being designed such that the porous pipes are arranged therein in such a way that the porous pipes essentially cannot be struck by solder splashes produced during the operation of the wave soldering installation. The method includes supplying the inert gas at a temperature far below the temperature of the solder.
    Type: Grant
    Filed: January 30, 2001
    Date of Patent: June 4, 2002
    Assignee: L'Air Liquide Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Fernand Heine
  • Patent number: 6398547
    Abstract: An oxy-combustion firing configuration, process, and apparatus can reduce the consumption of oxygen and fuel in an oxy-fuel combustion processes. Processes in accordance with the present invention include operation of an automated logic control device which controls an oscillating valve and controller. The valve and controller are used to oscillate the fuel and/or oxygen supplied to individual burners in a furnace. The oscillating parameters, such as frequency, amplitude, duty cycle, and phase difference between individual burners and their stoichiometry ratio are set to initiate preferable oxy-combustion in that furnace. Selective burner placement in the furnace enables the formation of deflagration zones which can provide very intense heating and complete combustion.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: June 4, 2002
    Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, American Air Liquide inc.
    Inventors: Mahendra L. Joshi, Harley Borders, Olivier Charon
  • Patent number: 6397630
    Abstract: A floating structure having an oscillation angle i not more than about 10°, bears an air distilling column with corrugated criss-cross packing. The undulating configuration of the corrugated strips of at least one pack is selected such that d/i<0.6, where d is the axis deviation of the cone spreading the liquid, when each pair of adjacent strips of the pack is inclined at an angle i in its general plane.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: June 4, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Philippe Fraysse, Etienne Werlen
  • Patent number: 6395138
    Abstract: This distributor (1) includes: a primary distributor (3) which delimits a closed volume provided with liquid predistribution openings (8) which open into the column; a device for feeding the primary distributor (3) with liquid under a pressure very much greater than the internal pressure of the column; and a secondary distributor (4) which occupies substantially the entire cross-section of the column, which includes a gas overhead in communication with the internal space of the column and which is subdivided by partitions (13, 17) into a plurality of compartments (16), each of which receives liquid originating from at least one of the said openings (8) of the primary distributor (3), this secondary distributor (4) having a bottom (9) provided with orifices (12) for fine distribution of the liquid over virtually the entire cross-section of the column, the number of these orifices being very much greater than the number of openings (8) of the primary distributor.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: May 28, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Bernard Darredeau, Jean-Yves Lehman
  • Patent number: 6395069
    Abstract: An aqueous solution with a pH of greater than 5, preferably of at least 6.5, can be used in an ion-exchange process, in particular a process for the manufacture of a zeolite. This aqueous solution comprises metal cations, such as zinc, and an agent for complexing the metal cations, such as citric acid or a salt of this acid. The proportion of free cations in solution represents from 0.1% to 99%, preferably from 1 to 30%, of the total amount of the metal in the solution. The invention also relates to a process for the manufacture of zeolites X or A employing such an aqueous solution and the use of the zeolites thus obtained for separating, purifying or converting one or more constituents of a gas stream, such as air, synthesis gases or hydrocarbons, in particular olefins, by employing an adsorption process, in particular a PSA, VSA or TSA.
    Type: Grant
    Filed: June 19, 2000
    Date of Patent: May 28, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Serge Moreau
  • Patent number: 6393867
    Abstract: In a combined plant consisting of a fluid production apparatus (P) having a main air compressor (44) and a fluid-consuming unit (2), a gas derived from the unit is expanded in a turbine (10, 20, 30, 40, 150) or another device capable of generating mechanical energy which drives a compressor (14, 24, 34, 44, 154° [sic]. Another turbine or device may expand another gas or the same gas derived from the unit so as to drive another compressor.
    Type: Grant
    Filed: February 6, 2001
    Date of Patent: May 28, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Alain Guillard
  • Patent number: 6393864
    Abstract: This reboiler-condenser (1) comprises two exchanger parts (2A, 2B) one placed above the other. The lower part (2A), immersed in the liquid, has supplied vaporization passages (8A). The vapour which leaves therefrom is sent to the inlet of the vaporization passages (8B) of the upper part and liquid is delivered into the stream of vapour which penetrates each of these passages. Application to the vaporization of liquid oxygen by the condensation of nitrogen.
    Type: Grant
    Filed: July 7, 2000
    Date of Patent: May 28, 2002
    Assignee: L'air Liquide, Societe Anonyme pour l'etude et l'Exploitation des Procedes Georges Claude
    Inventor: Bernard Darredeau
  • Patent number: 6391099
    Abstract: An improved scrubbing dust collector and exhaust gas treatment installation are described. The collector (2) includes a tank (21) containing a washing liquid, a scrubbing tower (22) on the upper portion of the tank into which an exhaust gas is introduced, a jetting nozzle (25) on the upper portion of the tower, and at least one netting member (42) located in a lower portion of the tower. The netting may be installed in a frame (40) which has slits therein. A plurality of netting members may be employed and a lower member may have a smaller mesh size than an upper one. The installation includes the scrubbing dust collector (2), a combustor (1) and a separator tower (23). As washing liquid is jetted from the nozzle (25), it passes downward in the scrubbing tower and forms a membrane-like layer on the netting member thereby providing a larger contact area between the exhaust gas and the washing liquid.
    Type: Grant
    Filed: March 22, 2000
    Date of Patent: May 21, 2002
    Assignee: L'air Liquide, Societe Anonyme pour l'etude et l'Exploitation des Procedes Georges Claude
    Inventors: Hidekazu Ina, Hideji Kawanaka
  • Patent number: 6392194
    Abstract: The process includes shielding of at least part of the welding zone with a gas mixture consisting of 1.2 to 1.70% oxygen and the balance being argon.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: May 21, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Jean-Marie Fortain, Philippe Lefebvre, Gerard Plottier
  • Patent number: 6390143
    Abstract: A method of manufacturing of colored, patterned areal textile structures according to which at least four weft threads of different base color are inserted in a specific constant sequence, and a constant cell is formed together with at least one warp thread, and wherein the weft threads are tied off in the cell with the warp thread so that a color cell with a specific color impression is produced.
    Type: Grant
    Filed: July 5, 2000
    Date of Patent: May 21, 2002
    Assignee: Brevitex Etablissement pour l'exploitation de Brevets Textiles
    Inventor: Francisco Speich
  • Patent number: 6389776
    Abstract: Provided are novel gas permeable bricks of a refractory material suitable for use in a hot grid of a regenerative heat exchanger. In accordance with one aspect of the invention, the brick has an inner face and an outer face on opposite sides of the brick. One or more cavities extend from the inner face partially into the brick. A plurality of channels for each of the cavities extend from the outer face to the cavities. The cavities and channels allow a gas to pass through the brick. Also provided is a hot grid suitable for use in a regenerative heat exchanger formed from a plurality of the bricks.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: May 21, 2002
    Assignee: L'Air Liquide Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventors: Marc Bremont, Karin Tynelius-Diez, Nicolas Perrin, Philippe Queille, Joël Pierre, Michel Poteau
  • Patent number: 6385996
    Abstract: In an apparatus for the separation of air by cryogenic distillation, the overhead gas of a mixing column is sent to the passages for warming a bottom reboiler of the low-pressure column of a double column fed with air to be distilled. The production of oxygen in the bottom of the low-pressure column is increased.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: May 14, 2002
    Assignee: L'Air Liquide, Societe Anonyme Aodirectoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Jean Renaud Brugerolle
  • Patent number: 6387157
    Abstract: A mixed gas concentration regulating method and a concentration regulating apparatus, in which the maintenance of the recovery of an easily permeable gas and the restraint of the power expense are compatible.
    Type: Grant
    Filed: July 19, 2000
    Date of Patent: May 14, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Naohiko Yamashita
  • Patent number: 6387212
    Abstract: The invention relates to a process for obtaining fibers integral with calcium carbonate particles, in which the fibers to be treated are contacted with carbon dioxide generator means and at least one composition comprising Ca++ ions capable of reacting with the carbon dioxide so as to give “in fine” a precipitation of calcium carbonate “in situ” on the fibers. Preferably, the carbon dioxide generator used is calcium bicarbonate.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: May 14, 2002
    Assignee: L'Air Liquide Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des procedes Georges Claude
    Inventor: Richard Christian
  • Patent number: 6383265
    Abstract: Improved polymer blends, and polymer blend membranes having improved mechanical properties are provided by alteration of the critical solution temperature of the polymer blend spinning solution through the incorporation of organic or inorganic complexing agents.
    Type: Grant
    Filed: August 15, 2001
    Date of Patent: May 7, 2002
    Assignee: L'Air Liquide Societe Anonyme A Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Okan Max Ekiner
  • Patent number: 6383258
    Abstract: A gas separation membrane is formed from a copolyimide produced by copolymerization of monomers which include o-tolidine sulfone, at least one other hydrophilic diamine and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride. One or more additional aromatic dianhydrides can optionally be included. The novel membrane exhibits an excellent combination of high selectivity of gases to be separated from a gas mixture, high permeability and strong solvent resistance to hydrocarbon chemicals. The membrane is therefore useful in separating gases from gas mixtures in which vapor or liquid hydrocarbon contaminants are present, for example in the separation of carbon dioxide from methane and/or nitrogen in the purification of natural gas.
    Type: Grant
    Filed: December 19, 2000
    Date of Patent: May 7, 2002
    Assignee: L'Air Liquide Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: John W. Simmons
  • Patent number: 6380171
    Abstract: The present invention relates to the cloning of human pro-protein converting enzyme 5 (PC5) CDNA isolated from human adrenal gland messenger RNA. Additionally, this invention relates to a method for reducing restenosis occurring at an injured vascular site comprising delivering to the injured site an antisense nucleic acid to suppress the expression of human PC5.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: April 30, 2002
    Assignees: Clinical Research Institute of Montreal, Universite de Montreal, Centre hospitalier de l'Universite de Montreal
    Inventors: Robert Day, Nabil G. Seidah, Rémi Martel, Michel Chrétien, Tim Reudelhuber, Guy LeClerc
  • Patent number: 6378553
    Abstract: The invention relates to a device (1) for distributing fluid under pressure, particularly welding gas, comprising at least one body (1′) provided with at least one manometer (3, 3′) comprising a housing (4) and a connection ferrule (2, 2′), said connection ferrule (2, 2′) being inserted in a recess (5, 5′) provided in the body (1′), characterized in that said body (1′) comprises moreover at least one passage (6, 16) communicating with said recess (5, 51), and in that said connection ferrule (2, 2′) comprises at least one recess (7, 71) and in that at least one connection means (8, 18) is inserted in at least one portion of at least one passage (6, 16) of the body (1′) and in at least one portion of at-least one recess (7, 7′) of the connection ferrule (2, 21), so as to permit the solidarization, at least temporarily, of said manometer (3, 3′) on said body (1′).
    Type: Grant
    Filed: October 19, 1999
    Date of Patent: April 30, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
    Inventor: Gilles Cannet
  • Patent number: 6379430
    Abstract: A process, especially a PSA or TSA process, for purifying a gas containing at least carbon dioxide (CO2) as impurity, in which the carbon dioxide is adsorbed on an adsorbent comprising particles of activated alumina. According to this process, the activated alumina has a specific surface area of between 200 m2/g and 299 m2/g and contains at least 80% aluminum oxide (Al2O3), silicon oxide (SiO2), iron oxide (Fe2O3) and from 0.001% to 7.25% of at least one oxide of at least one alkali or alkaline-earth metal, such as sodium and potassium oxides. According to the invention, the gas stream to be purified is air or a synthesis gas.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: April 30, 2002
    Assignee: L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'exploitation des procedes Georges Claude
    Inventor: Christian Monereau