EAST HARTFORD, Conn. (AP) -- In a continuing battle over engine part designs, jet engine-maker Pratt & Whitney says it has filed a federal lawsuit accusing Rolls Royce of misleading the U.S. Patent and Trademark Office to obtain a patent.
Pratt & Whitney, a subsidiary of United Technologies Corp., said Monday that Rolls-Royce's patent is invalid and unenforceable. It accused Rolls Royce of unlawfully using its patent and taking other actions to harm Pratt & Whitney.
A spokeswoman for Rolls Royce did not immediately return a call seeking comment.
Rolls Royce filed a patent-infringement lawsuit in August against United Technologies over the design of engine parts. It alleged that fan blades in a United Technologies geared turbofan engine infringe on a Rolls-Royce patent.
Pratt & Whitney denies the accusation.
