Patent Law Practice Center

The Supreme Court Argument in Microsoft v. i4i: Will the Court Lower the Burden for Proving Patent Invalidity in Infringement Litigation?

The much anticipated oral arguments in Microsoft Corp. v. i4i Ltd. took place at the Supreme Court yesterday, April 18, 2011.  The question on all of our minds is whether the Supreme Court will change the burden of proof for parties alleging patent invalidity in infringement litigation from a clear and convincing standard to a preponderance of the evidence standard?   Did yesterday’s proceedings bring us one step closer to the answer?  Jeanne Gills, Partner at Foley & Lardner and Practice Center Contributor, sent in this alert she wrote with her colleagues wherein they highlight the key points from the oral argument and provide some insight as to what the outcome of this important case may be.

For nearly three decades, the Court of Appeals for the Federal Circuit has required litigants defending a claim of patent infringement to prove invalidity by clear and convincing evidence. On April 18, 2011, the U.S. Supreme Court heard oral argument in Microsoft Corp. v. i4i Ltd. P’ship, No. 10-290, the first case to squarely address whether the presumption of validity codified in the 1952 Patent Act mandates a heightened burden of proof for defendants challenging validity in a patent infringement action, e.g., where the prior art was never considered by USPTO. Microsoft contends that the burden should be no greater than a preponderance of the evidence when the USPTO did not consider the most relevant prior art during patent examination. i4i is one of the most significant patent cases in years, and one of the most significant business cases of the Court’s term. Beyond reducing the burden on accused infringers to prove invalidity in patent litigation, a lowering of the standard of proof could widely impact the value of patents. (more…)