What year was the high strength synthetic fiber, which was the subject of a lawsuit between DuPont and Kolon Industries, developed?
DuPont v. Kolon Industries: DuPont v. Kolon Industries is an intellectual property lawsuit centering on the allegation that Kolon Industries (of ), a South Korea-based company, stole trade secrets concerning the production and marketing of Kevlar from DuPont, an American chemical company. Kevlar:  Developed by Stephanie Kwolek at DuPont in 1965, this high-strength material was first commercially used in the early 1970s as a replacement for steel in racing tires.
i don't know