Harhoff, Dietmar; Reitzig, Markus - C.E.P.R. Discussion Papers - 2002
We analyse the determinants of opposition to biotechnology and pharmaceutical patents granted by the European Patent … Office between 1978–96. Opposition can be considered an early form of patent validity challenge suit. In our sample, 8.6% of … the patents are attacked in opposition proceedings. Using citation and patent family indicators we show that valuable …