This morning the Federal Circuit issued four precedential opinions: two in patent cases appealed from the U.S. District Court for the District of Delaware; one in a patent case appealed from the Patent Trial and Appeal Board; and one in an international trade case appealed from the U.S. Court of International Trade. The court also released a nonprecedential order requiring the U.S. District Court for the Western District of Texas to transfer a patent case and an erratum. Here are the introductions to the opinions and order, and a link to the erratum.