Patents by Inventor David Philip Devonald

David Philip Devonald 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).

  • Preparation process of benzodifuranone dyes
    Patent number: 6013811
    Abstract: A process for the preparation of a polycyclic dye of Formula (1) which comprises steps: i) reaction of a compound of formula (2) with a compound of formula (3) or a derivative thereof to form an intermediate of formula (4) and ii) reaction of the intermediate of formula (4) with an aromatic compound of formula (5): B--H optionally in the presence of an oxidizing agent, wherein: A and B each independently is optionally substituted aryl; and X.sup.1 and X.sup.2 each independently is --H, halo, alkyl, or alkoxy.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: January 11, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: David John Milner, David Philip Devonald