Separating patent wheat from chaff: Would the US benefit from adopting patent post-grant review?

•EPO “opposition” (PGR) rates for counterparts of US litigated patents compared to (unlitigated) controls are about 3:1.•Conditional on PGR review, about 70% of these counterparts have patent claims amended or completely revoked.•We estimate possible benefit-to-cost ratios to the US implementing PGR...

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