Patents by Inventor Sanford Byrom Smith

Sanford Byrom Smith 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).

  • Solutions of azo dyes derived from 4-4-diamino-2,2-stilbenedisulfonic acid
    Patent number: 4118182
    Abstract: Aqueous dye solution, useful for dyeing cellulosic and leather substrates, consisting essentially of, by weight:(i) 10% to 25% of at least one dye selected from the group ##STR1## wherein M is a water-solubilizing cation; (II) 5% TO 20% OF UREA; AND(iii) 55% to 85% of water.
    Type: Grant
    Filed: August 24, 1977
    Date of Patent: October 3, 1978
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Sanford Byrom Smith
  • Solution of isomer mixture of naphthylazophenylazonaphthyl disulfonate dye
    Patent number: 4002424
    Abstract: Solution of a mixture of isomers of naphthylazophenylazonaphthyl dye containing two sulfonate substituents, the solution comprising said dye, water, triethanolamine, lithium base and urea. The dyes have good solubility and substantivity and are useful among other things, for dyeing cellulosic substrates.
    Type: Grant
    Filed: June 14, 1973
    Date of Patent: January 11, 1977
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Sanford Byrom Smith