The US Court of Appeals for the Federal Circuit has refused Amgen’s petition for a panel rehearing and a rehearing en banc of its recent ruling that Sandoz’ approved filgrastim and pending pegfilgrastim biosimilars do not infringe a US chromatography purification patent under the doctrine of equivalents.
However, the court agreed to amend its statement that “the doctrine of equivalents applies only in exceptional cases and is...






