Patents by Inventor Otto Nothiger

Otto Nothiger 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 continuous level processing of poly-acrylonitrile in the hydrated condition
    Patent number: 3979176
    Abstract: A process is described for the continuous processing of fibers produced in the wet spinning process, particularly for the continuous dyeing and/or optical brightening of polyacrylonitrile tow in the hydrated condition, wherein, for the obtainment of a level processing effect, the wet tow is spread out, preferably by using spreaders such as curved rods or curved rolls, before being impregnated with the processing liquor, to form a ribbon having a maximum thickness of 2 mm. By this process there is obtained over the whole cross-section, evenly processed polyacrylonitrile tow.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: September 7, 1976
    Assignee: Ciba-Geigy Corporation
    Inventors: Leo Kaiser, Otto Nothiger