Pratt & Whitney is stepping up its legal battle against Rolls-Royce over the fan design for the geared turbofan (GTF) by alleging the U.K. engine maker deliberately misled the U.S. Patent and Trademark Office. The claim, contained in a Sept. 27 filing against Rolls-Royce in the U.S. District Court in Connecticut, comes as Airbus and Boeing consider the GTF for upcoming re-engining decisions for the Airbus A320 and Boeing 737. The action follows the filing of an amended complaint by ...

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