Question: What year was the high strength synthetic fiber, which was the subject of a lawsuit between DuPont and Kolon Industries, developed?
Sentence (from "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.
Relevant evidence: Yes