Kwon, Soonwoo; Lee, Jihong; Lee, Sokbae - 2014
, progress has been made in terms of patent quality as well as distance to the frontier. Chinese patents are of higher quality … economies of Europe and Japan have displayed steady decline in their patent quality. Finally, the US has maintained, and in some … almost 4 million utility patents granted by the US Patent and Trademark Office (USPTO). Our estimation results on patent …