Patents by Inventor Jane Williams

Jane Williams 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).

  • Method for the alkaline bleaching of pulp with a peroxyacid based oxygen bleaching species using an agglomerated bleach activator
    Patent number: 6569286
    Abstract: Wood and non-wood pulp is bleached by: a) adding an aliquot of agglomerate from a bulk solids dispensing means, advantageously a hopper, to a dilute solution of hydrogen peroxide which is desirably agitated to keep the agglomerate in suspension, the agglomerate comprising: a bleach activator, advantageously tetraacetyl ethylene diamine (TAED); a peroxide soluble binder, preferably polyvinyl alcohol (PVOH); a dispersing system comprising a wetting agent which is a low foaming and does not discolour on exposure to temperatures of up to 120° C. and optionally a salt, preferably sodium acetate, which is highly soluble in hydrogen peroxide; and sequestrant which may additionally or alternatively be added directly to the hydrogen peroxide; b) allowing the TAED to substantially completely react with the hydrogen peroxide; c) adjusting the pH of the bleach solution by adding alkali, preferably caustic soda; and d) bleaching the pulp by contacting it with the bleaching solution under alkaline conditions.
    Type: Grant
    Filed: August 8, 2001
    Date of Patent: May 27, 2003
    Assignee: Warwick International Group Limited
    Inventors: John David Withenshaw, Jane Williams, Mark Ardern Chadwick, Neil Anthony Turner
  • Tanning leather
    Patent number: 6540790
    Abstract: Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage.
    Type: Grant
    Filed: April 14, 2000
    Date of Patent: April 1, 2003
    Assignee: Rhodia Consumer Specialties Limited
    Inventors: Gareth Rhys Collins, Christopher Raymond Jones, Robert Eric Talbot, Jane Williams, Mohsen Zakikhani
  • TANNING LEATHER
    Publication number: 20030000024
    Abstract: Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage.
    Type: Application
    Filed: April 14, 2000
    Publication date: January 2, 2003
    Inventors: GARETH RHYS COLLINS, CHRISTOPHER RAYMOND JONES, ROBERT ERIC TALBOT, JANE WILLIAMS, MOHSEN ZAKIKHANI