Vanessa Blum covers the federal courts in California for The Recorder, an American Lawyer affiliate.

Lawyers for Apple are pursuing an aggressive appellate strategy after losing their bid for sweeping permanent injunctions against Samsung devices a federal jury found violated Apple patents.

In an unusual move, Apple Inc.’s lawyers are asking the U.S. Court of Appeals for the Federal Circuit to bypass review by a three-judge panel and instead have the larger en banc court review the district court’s ruling to clarify what they consider an impossible new standard for obtaining permanent sales bans in patent cases.

The case warrants extraordinary treatment because it raises a “precedent-setting question of exceptional importance,” the company’s attorneys from Morrison & Foerster and Wilmer Cutler Pickering Hale & Dorr told the appeals court in a brief Wednesday.

The question is one that has been flummoxing IP lawyers since San Jose U.S. District Judge Lucy Koh addressed the confusion in an order last week granting a permanent injunction sought by Brocade Communications Systems Inc. against rival A10 Networks Inc. Grewal noted a “curious absence of references to the causal nexus standard” in recent Federal Circuit rulings.

In light of uncertainty in the lower courts, Apple’s lawyers suggest the Federal Circuit should consider the appeal in conjunction with en banc review of a panel decision in a related patent fight between Apple and Samsung.

That decision in Apple v. Samsung, known as Apple II, addressed the standard for a preliminary injunction. Koh’s ruling relied heavily on Apple II and its “causal nexus” standard in weighing Apple’s request for permanent injunctions.

“The two cases would present an ideal vehicle for eliminating the uncertainty regarding when a patentee can prevent a competitor from trespassing on its patented innovations,” Apple’s lawyers wrote.

Resolving the two cases in a coordinated proceeding “would present a unique opportunity to consider the preliminary injunction and permanent injunction standards at the same time,” they wrote.

Last week, Samsung’s lawyers at Quinn Emanuel Urquhart & Sullivan filed an brief in opposition to en banc review of Apple II, saying nothing in the ruling creates a new standard or warrants review by the larger panel.

“To the contrary, the panel merely applied the settled rule that irreparable harm requires ‘a causal nexus between the harm alleged and the infringing conduct,” the Quinn team wrote.