Changes

+ # Number of claims: higher claim number associated with greater patent value and thus more disputes. !!! + # Citations + # Ownership: Individual, listed/unlisted company. + # Patent portfolio size: grouped into 1-100 100-900 >900 + # Relative size of potential disputants: measure of the asymmetry in portfolio size between a patentee and a representative disputant he can expect to face on each patent. Let $<math>Z_{cf}$ </math> be the portfolio size for firm $f$ in technology class $c$, and let $Z_c = \sum_f Z_{cf}$ denote all patents in the class. $Z_f = \sum_c Z_{cf}$ is the portfolio size for firm $f$ $Z_c^* Z_c / n_c$ is the average portfolio size of the $n_c$ firms with patents in class $c$. The relative portfolio size of firm $f$ for patent $ i$ is given by: $R_{if} = Z_f /\sum_c w_{ci} Z_c^*$, where $w_ci = F_{ci}/F_i$ is the fraction of forward citations to patent $i$ that falls into technology class $c$. + # Technology concentration <math display="block">\text{geometric series:}\quad \sum_{i=0}^\infty 2^{-i}=2 </math>