Abstract
This paper uses the United States Patent and Trademark Office (USPTO) as a data source, combined with the Global Innovation Index (GII), systematically analyzes the technological innovations of the top 20 countries in the world in recent years, comparing the gaps in technological innovation between China and other developed countries. In 2008-2017, we retrieved 66,004 patents granted by Chinese inventors in the United States in the past 10 years, and analyzed the technological innovation level of first-tier cities in China from the perspectives of time distribution, regional distribution, distribution of assignees, and technical fields. The result shows that China's technology innovation output is growing at a high speed, and the proportion of patents in first-tier cities is 61.99%, the average annual growth rate was 25.33%. The innovation output is concentrated in the fields of digital communication and biomedicine.
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