Patents by Inventor Nancy E. Akers

Nancy E. Akers 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 Acid Red 151
    Patent number: 4248777
    Abstract: A process for preparing a non-gelling Acid Red 151 is provided. In the diazotization of aminoazobenzene monosulfonic acid in an aqueous mineral acid and the coupling of the diazotized amine with 2-naphthol in an aqueous alkaline solution, the mineral acid and alkali are chosen such that, in addition to forming the salt of the sulfonic acid group of the dye, disodium hydrogen phosphate salts are formed and left in solution in the final coupling mass.
    Type: Grant
    Filed: January 18, 1979
    Date of Patent: February 3, 1981
    Assignee: American Color & Chemical Corp.
    Inventor: Nancy E. Akers