Patents by Inventor Barrie D. Howarth

Barrie D. Howarth 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).

  • Process for preparing a S-trialkoxy benzene
    Patent number: 4102933
    Abstract: A 1,3,5-trialkoxy benzene having 1-2 carbon atoms in each of the alkoxy-groups is prepared at high overall yields, with minimal formation of hazardous or polluting by-products, by reacting 1,3,5-tribromo benzene with an alkalimetal alcoholate having 1-3 carbon atoms in the molecule in the presence of a copper salt, e.g. cuprous iodide or cupric chloride, and an aprotic solvent such as e.g. dimethylformamide. The product is readily recovered from the reaction mixture in an overall yield as high as 90%.
    Type: Grant
    Filed: July 23, 1976
    Date of Patent: July 25, 1978
    Assignee: Oce-Andeno B.V.
    Inventors: Barrie D. Howarth, Ryszard J. Kobylecki