Patents by Inventor Alexander McHugh Irvine

Alexander McHugh Irvine 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).

  • Metal complexes of bis-azomethines from hydroxy-aldehydes and alkylene diamines
    Patent number: 4044036
    Abstract: 1:1 metal complexes of bis-azomethines of the formula ##STR1## wherein R denotes an alkylene radical which contains 2-8 C atoms and is optionally interrupted by hetero-atoms, X denotes a H or halogen atom or an alkyl, alkoxy, carboxyl, alkoxy-carbonyl or phenylazo group and Y and Z denote H or halogen atoms, or wherein the substituents Y and Z form a fused benzene ring, if R contains a hetero-atom, Y and Z must not be H atoms, and if R contains 2 C atoms, X, Y and Z must not be H atoms, and a metal are valuable pigments coloring plastics and printing inks in fast yellow to range shades.
    Type: Grant
    Filed: September 9, 1974
    Date of Patent: August 23, 1977
    Assignee: Ciba-Geigy Corporation
    Inventors: Stefan Hari, Alexander McHugh Irvine, James McGeachie McCrae, Laurent Vuitel, Francois L'Eplattenier