Patents by Inventor Alfred Nagaj

Alfred Nagaj 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 production of spontaneously crimping polyacrylonitrile composite fibres with improved crimp properties
    Patent number: 4013753
    Abstract: The invention relates to a process for the production of spontaneously crimping composite fibres of acrylonitrile polymers wherein the dry-spun-filaments which still contain solvent are stretched to at least three times their original length in a bath of hot water which contains from 12 to 30 % by weight of dimethyl formamide. The stretching operation may be carried out in one or two stages.
    Type: Grant
    Filed: September 30, 1974
    Date of Patent: March 22, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hermann Lohwasser, Alfred Nagaj, Horst Wieden