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The Surprising Efficacy of Inter Partes Patent Re-examination

By Andrew S. Baluch and Stephen B. Maebius
October 30, 2008

In creating inter partes re-examination, Congress hoped to provide a faster, cheaper alternative for resolving questions of patent validity in the U.S. Patent and Trademark Office (“USPTO”), rather than in the courts. As a measure of the procedure's growing popularity and availability, the rate of requests for inter partes re-examination has steadily increased each year, totaling more than 308 since the procedure was created in November 1999 (USPTO Inter Partes Re-examination Filing Data (Sept. 30, 2007). But, while the pace of re-exam requests continues to increase, the end results of completed proceedings have received relatively little attention.

Here, we report the outcomes of all inter partes re-examinations completed as of August 2008. Although this is a small sample size and it is still too early to form any strong conclusions, there are some important results apparent in this sample. Surprisingly, the proceedings displayed a high 73% “kill” rate (complete elimination of all claims targeted by the requesters) ' a rate which is far above that in litigation (33%) and ex parte re-examination (12%) (See Kimberly A. Moore, Judges, Juries, and Patent Cases ' An Empirical Peek Inside the Black Box, 99 Mich. L. Rev. 365 (2000) and Dennis Crouch, Ex Parte Reexamination Statistics II, Patently-O, available at www.patentlyo.com/patent/2008/06/ex-parte-reexam.html (posted Jun. 25, 2008)).

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