Patents by Inventor Sarah J. Colgan

Sarah J. Colgan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6428625
    Abstract: In the invention pickling process, steel and nickel or chromium alloys are pickled with an acidic pickling solution employing an oxidant, particularly hydrogen peroxide, and in which liquor is recirculated through inlets comprising a nozzle feeding liquor into a diffuser such that liquor is withdrawn from the bath and the volume of liquor flowing through the diffuser is a multiple of flow through the nozzle. Steel or the alloys are pickled with an acidic solution containing iron and free hydrogen peroxide at a concentration of up to 0.1 gpl. The process can operate effectively at a free fluoride concentration of from 20 to 30 gpl and a sulphuric acid concentration of from 80 to 110 gpl. The lifetime of the bath before it needs to be replaced can be lengthened by the process compared with using an air agitation system.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: August 6, 2002
    Assignee: Solvay (Societe Anonyme)
    Inventors: Sarah J. Colgan, Neil J. Sanders
  • Patent number: 6210491
    Abstract: In the invention pickling process, steel and nickel or chromium alloys are pickled with an acidic pickling solution employing an oxidant, particularly hydrogen peroxide, and in which liquor is recirculated through inlets comprising a nozzle feeding liquor into a diffuser such that liquor is withdrawn from the bath and the volume of liquor flowing through the diffuser is a multiple of flow through the nozzle. Steel or the alloys are pickled with an acidic solution containing iron and free hydrogen peroxide at a concentration of up to 0.1 gpl. The process can operate effectively at a free fluoride concentration of from 20 to 30 gpl and a sulphuric acid concentration of from 80 to 110 gpl. The lifetime of the bath before it needs to be replaced can be lengthened by the process compared with using an air agitation system.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: April 3, 2001
    Assignee: Solvay
    Inventors: Sarah J. Colgan, Neil J. Sanders
  • Patent number: 6176937
    Abstract: Aqueous acidic solutions of hydrogen peroxide used for metal surface treatments suffer from an increased decomposition rate of the hydrogen peroxide, caused by the dissolved metals such as iron, copper or titanium. A method is provided wherein stabilization can be achieved by employing a combination of a) a hydroxybenzoic acid, preferably p-hydroxybenzoic acid; b) a hydrotropic sulphonic acid, preferably p-toluene sulphonic acid; and c) a hydrophobic alkaryl sulphonic acid, preferably dodecylbenzene sulphonic acid.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: January 23, 2001
    Assignee: Solvay Interox Limited
    Inventors: Sarah J. Colgan, Neil J. Sanders, Colin F. McDonogh
  • Patent number: 6126755
    Abstract: Aqueous acidic solutions of hydrogen peroxide used for metal surface treatments suffer from an increased decomposition rate of the hydrogen peroxide, caused by the dissolution of metals such as iron, copper, or titanium. Stabilization can be achieved by employing a combination of a) hydroxybenzoic acid, preferably p-hydroxybenzoic acid; b) a hydrotropic sulphonic acid, preferably p-toluene sulphonic acid; and c) a hydrophobic alkaryl sulphonic acid, preferably dodecylbenzene sulphonic acid.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: October 3, 2000
    Assignee: Solvay Interox Limited
    Inventors: Sarah J. Colgan, Neil J. Sanders, Colin F. McDonogh