Patent indicator data extraction process

Of the 23 technologies listed in Table \ref{table:TLC_transition_points}, 20 were found to have patent data available from during the emergence stage (i.e. excluding incandescent lights, landline telephones, and wireless data transfer). As such only those technologies with patent data available during the emergence stage are considered in the analysis that folNext, the raw patent data time series are transformed by using an inverse hyperbolic sine function and normalised to convert the data into a suitable format for long-term comparisons (see notes on