[Paper] Comparative study of 6 patent databases
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Study and comparison of the unique selling propositions (USPs) of free-to-use multinational patent search systems.
by Björn Jürgens (Enterprise Europe Network) and Nigel Clarke (EPO)
Comparative study of 6 patent databases not managed by patent authorities
Google Patents, Lens, Patent Inspiration, Free Patents Online, SureChEMBL and Octimine