Patents by Inventor Jurgen Dammann

Jurgen Dammann 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 nitro-T-acid (8-nitro-naphthalene-1,3,6-trisulphonic acid)
    Patent number: 4377535
    Abstract: A process has been provided for the preparation of nitro-T-acid by nitration of naphthalene-1,3,6-trisulphonic acid from a nitration mixture which has reacted to the extent of at least 80% which naphthalene-1,3,6-trisulphonic acid or a mixture containing the latter. Nitro-T-acid (and T-acid) is an intermediate for the preparation of H-acid which, in turn, is an intermediate for the preparation of dyestuffs.
    Type: Grant
    Filed: December 24, 1980
    Date of Patent: March 22, 1983
    Assignee: Bayer Aktiengesellschaft
    Inventors: Reinhard Kaiser, Horst Behre, Jurgen Dammann, Rolf Putter, Axel Vogel