Patents by Inventor David Alan Knowles

David Alan Knowles 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).

  • Herbicidal compositions
    Patent number: 4075005
    Abstract: Herbicidal compositions containing as active ingredients quaternary bipyridylium herbicides and additionally containing as a safety factor, an odorant alkyl carboxylic acid such as valeric acid and butyric acid.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: February 21, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventors: David Alan Knowles, Clive Gilroy Robson