Here is an update on recent en banc activity at the Federal Circuit. This week the en banc court will hear arguments in a veterans case. Late last week a supplemental reply brief was filed in that case. As for new petitions for en banc consideration, two were filed in patent cases raising various questions related to the doctrine of equivalents, prosecution history estoppel, vitiation, reasonable royalties, and obviousness. With respect previously-filed petitions, a new response was filed asking the court to reject a petition questioning whether whether a party who is not a patentee may sue for patent infringement. In addition, the court denied four petitions in patent cases raising questions related to mandamus jurisdiction over real-party-in-interest determinations, double patenting, transfer of venue, and claim construction. Here are the details.