June 1, 2009 - DuPont Co. has sued rival chemical manufacturer BASF SE for patent infringement, claiming that the German company's products infringe four patents DuPont holds related to an herbicide tolerant technology.
Last month Monsanto Co. (MON) filed a patent-infringement suit against DuPont and its Pioneer Hi-Bred International Inc. unit, alleging that DuPont is illegally using Monsanto's Roundup Ready herbicide-tolerant technologies.