Here is an update on recent en banc activity at the Federal Circuit in patent cases. Highlights include new petitions filed in five cases raising questions related to the Appointments Clause, marking and notice, and definiteness; one response to a petition raising questions related to collateral estoppel and inter partes review; one request by the Federal Circuit for a response to a petition raising questions related to collateral estoppel and the doctrine of equivalents; and the denial of petitions in three cases (including, notably, Arthrex). Here are the details.