Patents by Inventor Alastair Iain Currie Stewart

Alastair Iain Currie Stewart 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).

  • Chemical process for the extraction of 2-hydroxy pyridine derivatives, 2-hydroxyquinoline, and 2-hydroxybenzothiazole
    Patent number: 7186839
    Abstract: A process for extracting from aqueous solution the alkali metal or calcium salt of a halo or haloalkyl substituted 2-hydroxypyridine, or a 2-hydroxyquinoline or 2-hydroxybenzothiazole which comprises contacting an aqueous alkaline or neutral solution of the alkali metal or calcium salt, in which is dissolved an alkali metal fluoride, chloride, bromide, hydroxide, sulphate, sulphite, cyanate, cyanide, thiocyanate, thiosulphate, sulphide, phosphate, hydrogen phosphate, carbonate, bicarbonate, borate, chlorate, hypochlorite, perchlorate, nitrite, chromate, dichromate or permanganate or calcium chloride, bromide, nitrate, nitrite, chlorate, hypochlorite, perchlorate, thiocyanate, thiosulphate, chromate, dichtromate or permanganate, with a partially water-miscible organic solvent so as to transfer aqueous solution of the alkali metal or calcium salt of the 2-hydroxypyridine, 2-hydroxyquinoline or 2-hydroxybenzothiasole into the solvent whilst retaining separate aqueous and solvent phases, and thereafter separating
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: March 6, 2007
    Assignee: Syngenta Limited
    Inventors: Raymond Vincent Heavon Jones, Joanne Emma Murray, Jennifer Ann White, Alastair Iain Currie Stewart, Susan Thomson Hamilton, Alan John Whitton, Julie Forrester
  • Chemical process for the extraction of 2-hydroxy pyridine derivatives, 2-hydroxyquinoline, and 2-hydroxybenzothiazole
    Publication number: 20040099609
    Abstract: A process for extracting from aqueous solution the alkali metal or calcium salt of a halo or haloalkyl substituted 2-hydroxypyridine, or a 2-hydroxyquinoline or 2-hydroxybenzothiazole which comprises contacting an aqueous alkaline or neutral solution of the alkali metal or calcium salt, in which is dissolved an alkali metal fluoride, chloride, bromide, hydroxide, sulphate, sulphite, cyanate, cyanide, thiocyanate, thiosulphate, sulphide, phosphate, hydrogen phosphate, carbonate, bicarbonate, borate, chlorate, hypochlorite, perchlorate, nitrite, chromate, dichromate or permanganate or calcium chloride, bromide, nitrate, nitrite, chlorate, hypochlorite, perchlorate, thiocyanate, thiosulphate, chromate, dichtromate or permanganate, with a partially water-miscible organic solvent so as to transfer aqueous solution of the alkali metal or calcium salt of the 2-hydroxypyridine, 2-hydroxyquinoline or 2-hydroxybenzothiazole into the solvent whilst retaining separate aqueous and solvent phases, and thereafter separating
    Type: Application
    Filed: July 14, 2003
    Publication date: May 27, 2004
    Inventors: Raymond Vincent Heavon Jones, Joanne Emma Murray, Jennifer Ann White, Alastair Iain Currie Stewart, Susan Thomson Hamilton, Alan John Whitton, Julie Forrester