Patents by Inventor Albert Hullen

Albert Hullen 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 the preparation of 1-amino-8-naphthol-3,6-disulphonic acid (H-acid)
    Patent number: 4325889
    Abstract: The invention relates to a process for the preparation of 1-amino-8-naphthol-3,6-disulphonic acid (H-acid) as the mono-alkali metal salt from napthylamine-trisulphonic acid isomer mixtures by alkaline hydrolysis under pressure. The separation of the H-acid is effected by utilizing an aqueous sulphuric acid which contains naphthalene- and/or nitronaphthalene- and/or naphthylamine- and/or naphthol- and/or aminonaphthol-mono-, -di-and/or-tri-sulphonic acids.
    Type: Grant
    Filed: September 12, 1980
    Date of Patent: April 20, 1982
    Assignee: Bayer Aktiengesellschaft
    Inventors: Horst Behre, Albert Hullen, Bruno Kruger, Guido Steffan