Patents by Inventor Gert Rainer Kuhnel

Gert Rainer Kuhnel 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).

  • Batchwise dyeing of cellulosic textile material with indigo by the exhaust method
    Patent number: 6004358
    Abstract: The disclosure is a process for batchwise dyeing of cellulosic textile material with indigo by the exhaust method, which comprises applying the reduced indigo to the textile material from an aqueous dyeing liquor which includes a reductant, an alkali and additionally a further dissolved alkali metal salt in a concentration of from 200 to 350 g/l as electrolyte and whose pH has been set to 10.2-11.3, oxidizing the reduced indigo on the fiber back to the pigment while maintaining the high electrolyte concentration, and finishing the dyeing in a conventional manner.
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: December 21, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Rudolf Kruger, Gert Rainer Kuhnel, Georg Schnitzer