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Vague Claim Construction Rules Lead to Reversals

BY Lewis R. Clayton
August 01, 2003

Why can't federal trial judges figure out what patents mean? As it held en banc in Cybor Corp. v. FAS Technologies, Inc., 138 F3d 1448 (Fed. Cir. 1998), district court rulings on claim construction ' interpretations of the meaning of patent claims ' are reviewed de novo as questions of law by the U.S. Court of Appeals for the Federal Circuit. A recent study concluded that more than 40% of all claim construction rulings reviewed by the Federal Circuit in 2001 were reversed in whole or part. Andrew T. Zidel, “Patent Claim Construction in the Trial Courts: A Study Showing the Need for Clear Guidance from the Federal Circuit,” 33 Seton Hall L. Rev. 711 (2003). While other studies have reported lower numbers, this percentage is in line with a survey cited in Judge Rader's dissenting opinion in Cybor. Judge Randall R. Rader wrote then that a “reversal rate, hovering near 50%, is the worst possible. Even a rate that was much higher would provide greater certainty.”

Claim construction isn't easy ' particularly for a non-scientist ' and trial judges will never accumulate the patent law experience of judges on the Federal Circuit. Beyond these issues, however, are the Federal Circuit's rules of claim construction too confusing? Does the Federal Circuit tinker too much with lower court rulings, like a senior lawyer who rewrites everything he receives from an associate?

An Example

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