Removing Metal Patents (Class 205/702)
  • Patent number: 8961738
    Abstract: The invention concerns a method for controlling the adhesive bond between an electric-field responsive material and a substrate, which method comprises using an electric field to control the strength and integrity of the adhesive bond. The method may be used, for example, for removing or delaminating a material, which material is responsive to an electric field, from a substrate. The invention further comprises elimination of the application of the electric field and application of the previously removed electric-field-responsive material to the substrate, thereby resuming the strength and integrity of the adhesive bond. The invention includes apparatus for use in the bond controlling process.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: February 24, 2015
    Assignee: Polytechnic Institute of New York University
    Inventors: Victor Barinov, Kalle Levon
  • Publication number: 20140197040
    Abstract: Alkali metals and sulfur may be recovered from alkali monosulfide and polysulfides in an electrolytic process that utilizes an electrolytic cell having an alkali ion conductive membrane. An anolyte solution includes an alkali monosulfide, an alkali polysulfide, or a mixture thereof and a solvent that dissolves elemental sulfur. A catholyte includes molten alkali metal. Applying an electric current oxidizes sulfide and polysulfide in the anolyte compartment, causes alkali metal ions to pass through the alkali ion conductive membrane to the catholyte compartment, and reduces the alkali metal ions in the catholyte compartment. Liquid sulfur separates from the anolyte solution and may be recovered. The electrolytic cell is operated at a temperature where the formed alkali metal and sulfur are molten.
    Type: Application
    Filed: March 14, 2014
    Publication date: July 17, 2014
    Applicant: Ceramatec, Inc.
    Inventors: John Howard Gordon, Javier Alvare
  • Patent number: 8535509
    Abstract: Embodiments include membrane restoration process. A membrane can be restored by replacing an anolyte and a catholyte of a cell with a solution having an organic acid. The cell can include an anode, a cathode and a membrane fouled with a metal. A cheleate can be formed with the metal and the organic acid of the solution and an electric current can be provided between the anode and the cathode of the cell to protect the cell from corrosion while forming the chelate.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: September 17, 2013
    Assignee: Dow Global Technologies LLC
    Inventor: Jianqing Zhou
  • Patent number: 8313635
    Abstract: Bare aluminum baffles are adapted for resist stripping chambers and include an outer aluminum oxide layer, which can be a native aluminum oxide layer or a layer formed by chemically treating a new or used bare aluminum baffle to form a thin outer aluminum oxide layer.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: November 20, 2012
    Assignee: Lam Research Corporation
    Inventors: Fred D. Egley, Michael S. Kang, Anthony L. Chen, Jack Kuo, Hong Shih, Duane Outka, Bruno Morel
  • Patent number: 8298399
    Abstract: A method of microanalyzing ions, which includes: placing in a cavity having an internal volume, a volume of an ionic liquid that is smaller than the internal volume; placing in the cavity a solution containing the ions that are to be analyzed, a solvent of the solution and the ionic liquid being selected so as to be immiscible and so as to enable the ions to be transferred from the solution to the ionic liquid; and detecting a presence of the ions in the ionic liquid with an analyzer that analyzes at least one of cations or anions of the ions in the ionic liquid, in a free state or in a complexed state, the analyzer being in contact with the ionic liquid.
    Type: Grant
    Filed: May 24, 2007
    Date of Patent: October 30, 2012
    Assignee: Commissariat a l'Energie Atomique
    Inventor: Gilles Marchand
  • Patent number: 8241458
    Abstract: The invention concerns a method for controlling the adhesive bond between an electric-field responsive material and a substrate, which method comprises using an electric field to control the strength and integrity of the adhesive bond. The method may be used, for example, for removing or delaminating a material, which material is responsive to an electric field, from a substrate. The invention further comprises elimination of the application of the electric field and application of the previously removed electric-field-responsive material to the substrate, thereby resuming the strength and integrity of the adhesive bond. The invention includes apparatus for use in the bond controlling process.
    Type: Grant
    Filed: November 1, 2005
    Date of Patent: August 14, 2012
    Assignee: Polytechnic Institute of New York University
    Inventors: Victor Barinov, Robert Dabrowski, Kalle Levon
  • Patent number: 7794582
    Abstract: Disclosed is a method of recovering metal from waste plating stream and using the recovered metal comprising: providing a waste metal plating stream containing metal ions in an aqueous solution; passing the waste metal plating stream containing the metal ions into an electrochemical cell assembly having an inlet for the waste metal plating stream, a plurality of alternating anodes and cathodes porous to the waste metal solution and an exit from the cell; passing the waste metal plating stream through pores of the cathode; passing an electrical current through the anodes and cathodes, thereby depositing a portion of the metal ions onto the cathodes and reducing the amount of the metal ion in the solution from that in the introduced waste metal plating stream; recovering the deposited metal from the cathode; and using the recovered deposited metal as a source of soluble metallic anode to be deposited on to a substrate in a subsequent metal plating process.
    Type: Grant
    Filed: April 2, 2004
    Date of Patent: September 14, 2010
    Assignee: EW Metals LLC
    Inventors: Paul E Cook, Jeries I Bishara
  • Patent number: 7431819
    Abstract: A method for separating a metal-resin joint including the steps of: (1) immersing an article including a metal-resin joint with a counter electrode in an alkaline solution; and (2) applying a voltage over a certain time period between the metal portion of the joint and the counter electrode such that the potential of the metal portion is lower than that of a standard hydrogen electrode.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: October 7, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuo Nanno, Yoichi Izumi
  • Patent number: 7192556
    Abstract: The invention relates to a flow cell, a method for separating carrier-free radionuclides from a liquid or liquefiable target material, and the radiochemical reaction thereof. According to prior art, flow cells are known which require reaction volumes corresponding to the volume of the target material in order to carry out the desired reactions. The inventive flow cell (1) and method enable the reaction volume, and thus the quantity of starting material, to be reduced by a multiple by reducing the cylinder volume (=reaction volume). As the radioactively marked product is present in very small quantities (picomole to nanomole), the HPL-chromatographic separation of the non-reacted starting material is significantly improved. The economic efficiency of the method is increased due to the fact that small quantities of starting material can be used.
    Type: Grant
    Filed: February 6, 2003
    Date of Patent: March 20, 2007
    Assignee: Forschungszentrum Julich GmbH
    Inventors: Kurt Hamacher, Willi Bolten
  • Patent number: 6887368
    Abstract: The basic principles of the method for heavy metals electroextraction from technological solutions and wastewater includes pretreating to remove Chromium-6 and high concentrations of heavy metals and periodically treating in a six-electrode bipolar cylindrical electroreactor made of non-conducting material to achieve lower accepted levels of impurities. Six cylindrical steel electrodes form two triode stacks and are fed with three-phase alternating current of commercial frequency (50-60 Hz), which can be pulsed. Each phase of the three-phase current is connected to three electrodes of one triode stack or in parallel to two triode stacks. The parallel connection of three-phase current to two triode stacks is performed so that the same phase of the three phase current is connected in parallel with each two opposite electrodes of six electrodes located along the periphery, or with two adjacent electrodes. A bipolar stationary aluminum electrode is situated in the inter-electrode space.
    Type: Grant
    Filed: September 25, 2002
    Date of Patent: May 3, 2005
    Assignee: Ural Process Engineering Company, Ltd.
    Inventors: Aron Mikhailovich Khalemsky, Sergei Abramovich Payusov, Leonid Kelner, Jae Jo
  • Publication number: 20040195112
    Abstract: An apparatus and process for recovering metals from aqueous solutions by passing an aqueous solution, which contains dissolved metals, into a space between two elongated electrodes of a treatment chamber. A very high voltage electric field is created in the treatment chamber and is accompanied by a very small trickle current charge to enhance adsorption, polarization, ion exchange or to otherwise agglomerate the dissolved metal, which is then recovered by filtering, adsorbing, exchanging or otherwise separating the metal from the water.
    Type: Application
    Filed: January 6, 2004
    Publication date: October 7, 2004
    Inventors: Edward C. Weakly, Joseph N. Ignat, Henry L. DiCamillo
  • Publication number: 20040137587
    Abstract: The invention pertains to a method of separating multivalent ions and lactate ions from a fermentation broth comprising a multivalent ion lactate salt by using an electrodialysis or electrolysis apparatus, comprising the steps of introducing the broth wherein the multivalent ion concentration is at least 0.1 mole/l, the lactate ion concentration is less than 300 g/l, and less than 10 mole % of the lactate ion are other negatively charged ions, into a first compartment of the electrodialysis or electrolysis apparatus, which compartment is limited by an anion-selective or non-selective membrane and a cathode, and wherein the multivalent ion is converted to obtain a residual stream comprising the hydroxide of the multivalent ion, and the lactate ion is transported through the anion-selective or non-selective membrane into a second compartment limited by the anion-selective or non-selective membrane and an anode, after which the lactate ion is neutralized to lactic acid.
    Type: Application
    Filed: October 28, 2003
    Publication date: July 15, 2004
    Applicant: PURAC BIOCHEM B.V.
    Inventors: Peter Baets, Willem Jacob Groot
  • Patent number: 6620308
    Abstract: An electrochemically disbondable composition is provided having a matrix functionality and an electrolyte functionality wherein the electrolyte functionality is provided by a block copolymer or a graft copolymer. The matrix functionality provides an adhesive bond to a substrate, and the electrolyte functionality provides sufficient ionic conductivity to the composition to support a faradaic reaction at an interface with an electrically conductive surface in contact with the composition, whereby the adhesive bond is weakened at the interface. The composition may be a phase-separated composition having first regions of substantially matrix functionality and second regions of substantially electrolyte functionality. Adhesive and coating compositions and methods of disbonding also are described.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: September 16, 2003
    Assignee: EIC Laboratories, Inc.
    Inventor: Michael D. Gilbert
  • Publication number: 20020143225
    Abstract: The present invention relates generally to the removal of harmful substances from various objects or materials. More specifically, this invention relates to an improved method and apparatus for removing the harmful substances (i.e., toxins), from a variety of materials or objects by utilizing high-voltage electricity in conjunction with large surface charcoal, an electrical wire and water. The device of the present invention comprises a first conductive container which has large surface charcoal placed within it. This first container is then placed into a larger second conductive container which is filled with ordinary water (i.e., tap or faucet water). The electrical wire is immersed in the water filling the second container. Then the second container is sealed with a cover and insulated from the floor with insulating material. Finally, an electric source device generates 10,000 Volts at 1 Pico Ampere (10 micro watts) which is transferred to the purification device of the present invention.
    Type: Application
    Filed: October 29, 2001
    Publication date: October 3, 2002
    Inventor: Takeo Kagitani
  • Publication number: 20020096437
    Abstract: An apparatus electrochemically removes fine metal particles from an oil in water emulsion. The apparatus has a container for accommodating the emulsion. A supply port supplies the emulsion to the container. A plurality of cathode plates and anode plates are located in the container to face each other. The water in the emulsion is electrolyzed when a predetermined direct voltage is applied between the plates. The fine metal particles float with hydrogen generated by the electrolysis. Al(OH)3 attaches to H2 bubbles. A discharge port is located in a lower part of the container for discharging the emulsion from which the fine metal particles, sludge, oil and greese have been removed.
    Type: Application
    Filed: January 24, 2001
    Publication date: July 25, 2002
    Inventors: Yukio Enomoto, Toshiaki Yamamoto, Chen-Lu Yang
  • Patent number: 6391186
    Abstract: An electrochemical process, for removing or modifying ions in solution, incorporates an electrolytic cell comprising a bipolar bed of conductive and non-conductive cell particulate material spaced between two electrodes across which an electrical voltage is applied causing the removal or modification of the ions. A certain minimum of non-conductive particulates in the bed is required to prevent the bed from shunting. The solution contains anions or cations or both, which are to be destroyed, transformed to other species, plated onto the electrode or otherwise modified. The bed acts as a bipolar electrode because it contains both positively and negatively charged sites so that the cations migrate to the negatively charged sites and the anions to the positively charged sites to undergo electrochemical reactions. The electric current in the cell can flow in either direction to achieve the same result so an alternating current is as effective as a direct current.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: May 21, 2002
    Inventor: John E. Stauffer
  • Patent number: 6277265
    Abstract: An apparatus and method for electrocoriolysis, the separation of ionic substances from liquids in the electrodynamic mode. The method maximizes centrifugal forces on a fluid contained in a chamber having oppositely polarized electrodes. A feed fluid is fed into the chamber. Spacing of the electrodes can be minimized for enhancement of the process. A constant voltage can be applied. Centrifugal force and the electric potential across the chamber create enhanced separation. Concentrated solution can be removed from a location in the chamber and depleted solution from another location.
    Type: Grant
    Filed: July 23, 1999
    Date of Patent: August 21, 2001
    Assignee: Apogee Corporation
    Inventor: Joseph J. Hanak
  • Patent number: 6258251
    Abstract: An electrolytic cell for the recovery of silver from a photographic fixer solution is of generally cylindrical configuration. The cell has a screw-on lid that carries the disposable cathode of the cell. Inlet and outlet for the solution are at the bottom of the cell. The anode is tubular and extends upwardly from the outlet at the base of the cell towards the lid. The cathode is easily replaced, together with the lid, and flow through and the dimensions of the cell are arranged to avoid entrapment of gas therein.
    Type: Grant
    Filed: July 2, 1999
    Date of Patent: July 10, 2001
    Assignee: Eastman Kodak Company
    Inventors: Bruce S. Gowans, Nicholas J. Dartnell
  • Patent number: 6251258
    Abstract: In an electrolytic bath, an extraction part extracts heavy metal in the internal organs of scallops into an acid solution. A direct current voltage is applied between electrodes, which are provided in the acid solution, to deposit the heavy metal in the acid solution on the electrodes. If the deposit efficiency deteriorates, the polarity applied between the electrodes is reversed from the polarity in the deposition of the heavy metal in a neutral or alkali electrolytic solution. Consequently, the heavy metal is removed from the electrodes. Since arsenic is dissolved in the acid solution, an alkali liquid and a flocculant are added to the acid solution to sediment arsenic.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: June 26, 2001
    Assignee: Hitachi Plant Engineering & Construction Co., Ltd.
    Inventors: Masayuki Kojima, Toshiyuki Hishinuma, Hiroyuki Ichikawa, Hiroshi Asakura, Masataka Kasai
  • Patent number: 6241872
    Abstract: A method and apparatus concentrates, collects and removes heavy metals, other cations, and anions from media permitting generation of electrical fields. The heavy metals and other cations are electrochemically concentrated and precipitated for rapid removal from the aqueous media. The media, which may be aqueous, soils or wastes, is filtered and passed through a cation or anion exchange resin beds. Metals or anions are captured and held in the resin beds. Current is then applied through the resin beds using opposing electrodes of opposite polarity. In the metal removal units, heavy metals and other cations are concentrated around the negative electrode and lifted to a top of the electrode chamber using hydrogen gas lift. The concentrated solution of heavy metals and cations are removed from the chamber above the negative electrode and are circulated to provide additional time for growth and precipitation.
    Type: Grant
    Filed: July 27, 1999
    Date of Patent: June 5, 2001
    Assignee: Compliance Consultants, Inc.
    Inventors: Robert E. Marks, Stephen D. Field, Mary Madden Field
  • Patent number: 6074537
    Abstract: A method and apparatus concentrates, collects and removes heavy metals, other cations, and anions from media permitting generation of electrical fields. The heavy metals and other cations are electrochemically concentrated and precipitated for rapid removal from the aqueous media. The media, which may be aqueous, soils or wastes, is filtered and passed through a cation or anion exchange resin beds. Metals or anions are captured and held in the resin beds. Current is then applied through the resin beds using opposing electrodes of opposite polarity. In the metal removal units, heavy metals and other cations are concentrated around the negative electrode and lifted to a top of the electrode chamber using hydrogen gas lift. The concentrated solution of heavy metals and cations are removed from the chamber above the negative electrode and are circulated to provide additional time for growth and precipitation.
    Type: Grant
    Filed: April 29, 1997
    Date of Patent: June 13, 2000
    Assignee: Compliance Consultants, Inc.
    Inventors: Robert E. Marks, Stephen D. Field, Mary Madden Field
  • Patent number: 6071399
    Abstract: An electrolytic cell comprises a housing (12), means (21) defining a liquid level (25) in said housing (12), a first contact surface (32) positioned above said liquid level (25) for making contact with a removable electrode (20) when positioned in said housing (12). A second contact surface (36) is positioned above said liquid level (25) and electrically isolated from said first contact surface (32) for making contact with said removable electrode (20) when positioned in said housing (12). A method of electrolysis in such a cell comprises supplying electrical power to said electrode (20) at an electrolysing potential (U.sub.P) and controlling the electrolysing potential (U.sub.P) in response to the potential (U.sub.2) sensed at the second contact surface (36). Control of the electrolysis process is possible without influence of any unknown and variable resistance between the first contact surface and the electrode.
    Type: Grant
    Filed: January 11, 1999
    Date of Patent: June 6, 2000
    Assignee: Agfa-Gevaert
    Inventors: Patrick Van der Bergen, Paul Jansen, William Fobelets
  • Patent number: 5997717
    Abstract: Disclosed herein is electrolyzed functional water produced by the process comprising a step of feeding water containing electrolytes to a first electrolytic cell equipped with an anode, a cathode and an ion-permeable membrane between them to electrolyze it, and a step of electrolyzing the electrolyzed water obtained from the cathodic side of the first electrolytic cell on the anodic side of a second electrolytic cell equipped with an anode, a cathode and an ion-permeable membrane between them. Production processes and production apparatus of the electrolyzed functional water are also disclosed.
    Type: Grant
    Filed: November 7, 1997
    Date of Patent: December 7, 1999
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kohichi Miyashita, Keiji Nagano, Toshikazu Nakamura
  • Patent number: 5954936
    Abstract: The invention provides a method and processing system for removing both anionic and cationic technetium complexes from an aqueous solution by adjusting the pH of the solution to greater than approximately 2, and directing the solution into an integrated resin and electrochemical plating device. The integrated resin and plating device has a resin bed or resin membrane in which is disposed one or more cathodes, and one or more anodes. A potential generator produces at least a 1 volt potential between the cathodes and the anodes. As the solution passes through the resin, the technetium complexes are adsorbed onto it. When a sufficient concentration of technetium complexes is adsorbed, the plating process can atlernatively be driven to plate out the technetium onto the cathodes, or to collect various species in system anolytes/catholytes.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: September 21, 1999
    Assignee: Scientific Ecology Group, Inc.
    Inventors: Thomas Stephen Snyder, David Charles Grant
  • Patent number: 5951844
    Abstract: An apparatus for de-silvering silver-containing solutions comprises an electrolytic cell (10) having an anode (20), a cathode (30) and a reference electrode (45) positioned adjacent the cathode (30), and electrical power supply control means (41) for controlling the supply of electrical power to the anode (20) and the cathode (30). Operation of the cell (10) is controlled potentiostatically while the current exceeds a certain threshold value and the current is controlled galvanostatically at that threshold (minimum) value in circumstances in which the potentiostatic control would result in a current below the threshold value.
    Type: Grant
    Filed: April 10, 1997
    Date of Patent: September 14, 1999
    Assignee: Agfa Gevaert
    Inventors: Benedictus Jansen, Werner Van de Wynckel, Frank Michiels
  • Patent number: 5894077
    Abstract: A radioactive waste stream (12) is of high pH and contains a wide variety of different fission products and also organic materials which act as complexants. Technetium and/or ruthenium are removed by first electrolytically oxidising the organic materials at an anodically stable anode (26), and then electrolytically reducing the technetium and/or ruthenium at a porous fluid-permeable cathode (42). The cathode (42) might for example be of lead wool.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: April 13, 1999
    Assignee: AEA Technology plc
    Inventors: Christopher Peter Jones, Paul Antony Harry Fennell, Patrick Alan Fletcher
  • Patent number: 5858199
    Abstract: An apparatus and method for separating and removing ionizable components dissolved in fluids, such as for example, water, by separating said ionizable substances into fractions by the action of electric current and of Coriolis force. Liquid containing ionizable components is continuously fed in and the purified solvent and the solute in a concentrated solution are continuously removed while the liquid is rotated. Compound centrifugal force or Coriolis force causes the concentrated solution to move to a location where it can be effectively and continuously removed as well as causes the depleted liquid to move to a separate location where it also can be effectively and continuously removed. The invention can operate in several modes, the modes being electrolytic and electrostatic. The invention allows for almost universal application to removal of ionizable components and provides a cost effective and energy efficient continuous process to do so.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: January 12, 1999
    Assignee: Apogee Corporation
    Inventor: Joseph J. Hanak
  • Patent number: 5855764
    Abstract: The present invention provides for a method of decreasing the metals content of metal containing petroleum streams by forming a mixture of the petroleum fraction containing those metals and an aqueous electrolysis medium containing electron transfer agent, and passing an electric current through the mixture or through the pretreated aqueous electrolysis medium at a voltage, sufficient to remove the metals such as Ni, V and Fe from the stream (i.e. to produce a petroleum fraction having decreased content of the metals). The cathodic voltage is from 0 V to -3.0 V vs. SCE. The invention provides a method for enhancing the value of petroleum feeds that traditionally have limited use in refineries due to their metals, e.g., Ni and V content.
    Type: Grant
    Filed: July 15, 1997
    Date of Patent: January 5, 1999
    Assignee: Exxon Research and Engineering Company
    Inventors: Mark Alan Greaney, William Neergaard Olmstead
  • Patent number: 5823357
    Abstract: The invention provides a method and system for automated sorting or articles such as railroad wheels. After the wheels are inspected and designated as fitting a particular category, the wheels are moved to a transfer car and the wheel and transfer car are moved to a wheel pick up station, where an overhead hoist awaits. As the wheel and transfer car are moved, a hook portion of the hoist is received in the wheel axles hole. The hoist raises the wheel out of the transfer car and then the hoist and wheel move laterally to a wheel drop off station corresponding with the category of the wheel. A shuttle car with an empty wheel receiving slots is below each wheel drop off station. The hoist lowers the wheel into the aligned wheel slot of the appropriate shuttle car for that category of wheel. After the wheel is deposited in the slot, the shuttle car indexes away from the hoist, freeing the wheel and hoist from one another. The hoist is then raised and returned to the wheel pick up station.
    Type: Grant
    Filed: July 11, 1997
    Date of Patent: October 20, 1998
    Assignee: AMSTED Industries Incorporated
    Inventors: Christopher Z. Sieradzki, Jaime F. Pozo
  • Patent number: 5817228
    Abstract: The invention is a method for demetallating petroleum streams by subjecting a hydrocarbon soluble metals-containing petroleum stream and an aqueous electrolysis medium to a sufficient anodic potential at a pH sufficient to produce a treated petroleum stream having a decreased metals content. The invention is useful for enhancing the value of petroleum streams that traditionally have limited use in refineries due to their content of metals, particularly Ni and V.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: October 6, 1998
    Assignee: Exxon Research and Engineering Company
    Inventors: Mark Alan Greaney, Michael Charles Kerby
  • Patent number: 5810995
    Abstract: The casing metal of, for example, a munition containing organic materials is removed or at least perforated by anodic dissolution in a chamber (16) fabricated to contain the explosion should the munition detonate. The contents are then exposed to reaction with anolyte from a plant (17), the anolyte comprising nitric acid and electrochemically regenerable silver II ions.
    Type: Grant
    Filed: October 22, 1996
    Date of Patent: September 22, 1998
    Assignee: AEA Technology plc
    Inventors: Richard James Soilleux, David Frame Steele, Nigel Desmond Evan Warren
  • Patent number: 5804057
    Abstract: Metal salts are removed from solution in an electrolyte by subjecting the solution to electrolysis in a cell having an anode that has an anion exchange membrane closely associated therewith which sequesters the anion of the salt. The cathode may also be provided with a closely associated cation exchange membrane that sequesters, at least partially, the cation of the salt. A metal salt solution can be regenerated by reversing the polarity of the electrodes and conducting an electrolysis using fresh electrolyte.
    Type: Grant
    Filed: June 7, 1996
    Date of Patent: September 8, 1998
    Assignee: Faraday Technology, Inc.
    Inventors: Chengdong Zhou, E. Jennings Taylor, Robert P. Renz, Eric C. Stortz, Jenny J. Sun
  • Patent number: 5783060
    Abstract: The cell controller 18 responds to a number of specific conditions including a flow switch 24 output signal 34 which indicates that fresh solution flows from a reservoir 14 into the metal solution tank 12. The cell will be caused to operate in the plating mode in response to the detection of fresh solution flow, and cell performance can be monitored by comparing an estimate of metal released into the solution based on flow of fresh solution and a measurement of metal recovered. The invention is particularly advantageous for controlling the electrolytic recovery of silver from photographic processing solution.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: July 21, 1998
    Assignee: Metafix Inc.
    Inventors: John La Riviere, Bernard Gravel, Gordon Bathurst
  • Patent number: 5776330
    Abstract: Apparatus and methods for decontaminating surfaces are disclosed. A housing is configured with first and second channels and first and second fluid pathways in fluid communication therewith, respectively. First and second applicators are positioned within respective first and second channels and electrodes are electrically connected with the applicators. Electric current of a first polarity is supplied to a first applicator via the first electrode, and electric current of a second polarity is supplied to a second applicator via the second electrode. Decontaminating a surface comprises supplying a first fluid to a first applicator, supplying a second fluid to a second applicator, generating an electrical potential between the first and second applicators, and contacting the contaminated surface with the first and second applicators.
    Type: Grant
    Filed: May 8, 1996
    Date of Patent: July 7, 1998
    Assignee: Corpex Technologies, Inc.
    Inventor: Thomas F. D'Muhala
  • Patent number: 5770030
    Abstract: Ionizable or polarizable, carrier-free radionuclides may be separated by electrofixation, from a low electric conductivity liquid target material in a flow cell fitted with a permanent electrode arrangement. The target liquid is separated while the fixing voltage is maintained; then the fixed radionuclide is removed again from the electrode, if required by heating, after switching off or reversing the poles of the field, after an optional intermediate rinsing.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: June 23, 1998
    Assignee: Forschungszentrum Jolich GmbH
    Inventors: Kurt Hamacher, Gerrit Blessing
  • Patent number: 5770034
    Abstract: An apparatus for desilvering silver-containing solutions comprises an electrolytic cell (10) having an anode (20), a cathode (30) and a reference electrode (45) positioned adjacent the cathode (30), and electrical power supply control means (41) for controlling the supply of electrical power to the anode (20) and the cathode (30). The power supply control means (41) includes means (60) for adjusting the cathode potential and control means (70) linked to said adjustment means (60) to reduce the cathode potential, at least periodically, as the desilvering process continues. The process leads to better silver adhesion on the cathode occurs, while maintaining good desilvering levels in the solution, and cathode poisoning is minimised.
    Type: Grant
    Filed: July 8, 1996
    Date of Patent: June 23, 1998
    Assignee: Agfa-Gevaert N.V.
    Inventors: Benedictus Jansen, Fernand Ketels, Paul Smet, Werner Van de Wynckel, Michiels Frank
  • Patent number: 5759377
    Abstract: A silver-containing solution is de-silvered in an electrolytic cell having an anode and a cathode. The diffusion limitation current density of the electrolytic cell is estimated by measuring a current flow there-through and silver is deposited on the cathode at a de-silvering current density which is lower than the diffusion limitation current density.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: June 2, 1998
    Assignee: Agfa-Gevaert
    Inventors: Guy Damen, Benny Jansen, Patrick Mertens, Werner Van de Wynckel, Paul Smet, Frank Michiels
  • Patent number: 5753099
    Abstract: In the recovery of an electrically conductive metal from a liquid containing the metal in solution, a cathode member for deposition of the metal by electrolysis, comprises a carrier sheet with a cathode element of the metal to be recovered, on one side of the sheet; the carrier sheet is of a material from which the metal is readily refinable when smelted with the carrier sheet; the cathode member has particular application for removal of the silver content of fixer solution in photography; suitably the sheet is flexible and has a memory of a planar state, such that on being rolled into a cylindrical tubular configuration, it returns to the planar state unless restrained.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: May 19, 1998
    Assignee: Metafix Inc.
    Inventors: Bernard Gravel, Gordon Bathurst, John LaRiviere
  • Patent number: 5752206
    Abstract: Processes for in-situ decontamination and recovery of metal from radioactive-contaminated metal which is contained in process equipment, including ancillary systems of process equipment, comprise two basic steps. In the first step, an acid decontamination solution is circulated through the equipment and in contact with the radioactive-contaminated metal for removing the radioactive contaminants and a first surface portion of the metal from the metal-containing equipment. In the second step, an acid digestion solution is circulated through the equipment for removing at least a second portion of the metal which is substantially free of radioactive contaminants. The present methods are particularly suitable for in-situ decontamination and recovery of nickel from radioactive-contaminated nickel diffusion barriers in the cascade converters of uranium gas diffusion plants.
    Type: Grant
    Filed: April 4, 1996
    Date of Patent: May 12, 1998
    Inventors: Neal A. Frink, Daniel D. Burns, Paul G. Frink, Amy Ciric