Patents by Inventor Edwin D. Harvey

Edwin D. Harvey 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).

  • Basic azo dyestuffs containing a n-picolinium alkylene amino phenyl group
    Patent number: 4217271
    Abstract: Basic azo dyestuffs devoid of sulphonic acid and carboxylic acid groups and of the formula ##STR1## wherein A is an optionally substituted aromatic carboxylic or heterocyclic radical, R is an optionally substituted lower alkyl, aralkyl or cycloalkyl radical, Y is an optionally substituted alkylene radical of 1 to 4 carbon atoms, Z.sup..sym. is a 3- or 4-methylpyridinium group, X is an anion and the ring B may be further substituted, useful for dyeing synthetic polymeric materials especially polymers and copolymers of acrylonitrile.
    Type: Grant
    Filed: March 29, 1978
    Date of Patent: August 12, 1980
    Assignee: Imperial Chemical Industries Limited
    Inventors: Peter Gregory, Edwin D. Harvey