Johnson, Daniel K N; Popp, David - In: RAND Journal of Economics 34 (2003) 1, pp. 96-112
Beginning in November 2000, patent applications filed in the United States are disclosed after 18 months, rather than when the patent is granted. Using U.S. patent data from 1976 to 1996, we find that major inventions are most likely to be affected, as they take longer to go through the...