Patents by Inventor Robert P. Huth

Robert P. Huth 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).

  • Edible compositions colored with (2-alkoxy-4-sulfonyl-5-alkyphenyl)azo-1-hydroxynaphthalene sulfonic acids
    Patent number: 4707373
    Abstract: Salts of phenylazonaphthyl sulfonic acids useful as blue-red colorants for textile fabrics, cellulosic fibers and edible compositions are prepared by diazotizing aniline sulfonic acid and coupling the resulting diazo compound to a 1-hydroxynaphthalene mono- or disulfonic acid.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: November 17, 1987
    Assignee: Hilton Davis Co.
    Inventors: Wayne L. Cook, Robert P. Huth
  • (2-alkoxy-4-sulfonyl-5-alkylphenyl)azo-1-hydroxynaphthalene sulfonic acids
    Patent number: 4675389
    Abstract: Physiologically acceptable cation salts of (2-alkoxy-4-sulfonyl-5-alkylphenyl)azo-1-hydroxynaphthalene sulfonic acids useful as blue-red colorants for textile fabrics, cellulosic fibers and edible compositions are prepared by diazotizing 2-alkoxy-4-sulfonyl-5-alkylanilines and coupling the resulting diazo compounds to a 1-hydroxynaphthalene mono- or disulfonic acid.
    Type: Grant
    Filed: June 5, 1984
    Date of Patent: June 23, 1987
    Assignee: The Hilton-Davis Chemical Co.
    Inventors: Wayne L. Cook, Robert P. Huth