These movies illustrate the mobility of patented U.S. inventors, based on different addresses and their date of patent application. The arc appears in the year that the latter patent was applied for. Of note is the substantial increase in inventor migration to California over the observed years. Michigan’s noncompete brain drain can also be seen, in the increased emigration following the 1985 passage of the Michigan Antitrust Reform Act. Latter years appear light due to the lag between patent application and grant.
Disambiguation of inventors based on R. Lai and D. Doolin, A. D’Amour, A. Yu, Y. Sun, V. Torvik. “Disambiguation and co-authorship networks of the U.S. Patent Inventor Database,” working paper, Fung Institute. For econometric evidence of Michigan brain drain, see M. Marx and J. Singh, “Regional Disadvantage: Non-competes and Brain Drain,” working paper, Fung Institute. Visualizations done by Guan-Cheng Li.