Renesas Electronics says the US District Court for the District of Massachusetts has ruled in its favor in a patent infringement lawsuit brought against it in 2013 by a Massachusetts-based firm named Zond.

In July 2013, Zond brought suit against a number of semiconductor companies, including Renesas, alleging that the companies infringed eight of its US patents covering production-related technologies such as plasma discharge.

Renesas and other defendants challenged the patentability of Zond’s remaining patents. By January 2016, all seven patents had been ruled unpatentable by the Patent Trial and Appeal Board (PTAB).

Zond appealed the rulings to the United States Court of Appeals for the Federal Circuit (CAFC), and on January 18, 2017, CAFC upheld the PTAB’s rulings for the remaining patents.

Following the decision concluding unpatentability of the Zond patents, on July 14, United States District Court for the District of Massachusetts entered final judgment in favor of Renesas and Renesas Electronics America.

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