Rolls-Royce in late August filed a complaint alleging infringement by United Technologies (UTC) of the patent for the Rolls-Royce swept fan blade–the same design, claims Rolls, that UTC subsidiary Pratt & Whitney used in its PW1000G PurePower geared turbofan for the Bombardier C Series and Mitsubishi MRJ. The complaint specifically identifies the fan stages on both the PW1000G and Engine Alliance GP7200 engine and alleges that a number of other UTC civil engines......
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