Patents by Inventor Jo Ann Cleverdon

Jo Ann Cleverdon 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).

  • Crown ether complexes of direct yellow 11 and dyestuff containing same
    Patent number: 4502864
    Abstract: Liquid concentrate of Direct Yellow 11 based on the crown ether complexes of tetrasodium direct yellow 11, are described as well as these novel soluble chelates of insoluble tetrasodium complexes of Direct Yellow 11.
    Type: Grant
    Filed: April 25, 1984
    Date of Patent: March 5, 1985
    Assignee: Ciba-Geigy Corporation
    Inventor: Jo Ann Cleverdon