Graham, Stuart J. H.; Hall, Bronwyn H.; Harhoff, Dietmar; … - Institute of Business and Economic Research (IBER), … - 2002
matched sample of USPTO and EPO patents, we compare the determinants of opposition and of reexamination. Our results indicate … than thirty times higher than the rate of reexamination at the USPTO. Moreover, opposition leads to a revocation of the … patent in about 41 percent of the cases, and to a restriction of the patent right in another 30 percent of the cases. Re-examination …