API-patented Blended Winglets. Courtesy, API. Airbus has filed a lawsuit against Boeing affiliate Aviation Partners (API), seeking to invalidate API’s patent on Blended Winglets. The lawsuit, filed in the US District Court for the Western District of Texas, claims that “in written and oral communications with Airbus, API has stated repeatedly … that Airbus’ winglet design falls within the claims of the [Blended Winglets] Patent, and that Airbus must ...

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