In the latest salvo in a legal battle between the two companies in U.S. District Court in Manhattan, DuPont said Invista broke a Patent and Technical Information Agreement under which Invista is not allowed to use DuPont technology to make nylon engineering resins for several years.

The lawsuit said Invista had contacted various DuPont engineering resins customers in recent months, offering for sale its manufactured nylon engineering resin products and informing them of Invista's ability to make nylon engineering resin products.

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