ABSTRACT
Germany remained preeminent in the Žber Želd until 1935, when Carothers in the United States discovered the nylons; E. I. DuPont in America introduced and began marketing nylon Žbers, protected by a barrage of patents that proved impossible to overcome. Nothing as versatile and practical as the polyamides was available, prompting Bayer to investigate similar polymers not covered by the impenetrable DuPont patents.
