Patents by Inventor Ian Donald Maxwell

Ian Donald Maxwell 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).

  • Polyester dispersants
    Patent number: 6787600
    Abstract: A dispersant which comprises a polyamine (eg polyallylamine) or polyimine (eg polyethyleneimine) backbone chain containing side chains of two or more different types of polyester chain wherein at least one type of polyester chain is derivable from one or more hydroxy carboxylic acids all of which contain a C1-8-alkylene group or lactone thereof such as &egr;-caprolactone and/or &dgr;-valerolactone and at least one other type of polyester chain derivable from one or more hydroxy carboxylic acids wherein at least one of the hydroxy carboxylic acids contains a C8-30-alkylene chain (e.g 12-hydroxystearic acid) or a C8-30-alkenylene chain (eg ricinoleic acid) or lactone thereof.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: September 7, 2004
    Assignee: The Lubrizol Corporation
    Inventors: Dean Thetford, Ian Donald Maxwell, Lindsay Anne Slater