Patent–CRSP match, 1926-2017
This data provides a patent–CRSP permco match, as used in our working paper paper, Stoffman, N. and Woeppel, M. and Yavuz, M. D., Small Innovators: No Risk, No Return. Available at SSRN: https://ssrn.com/abstract=3291471

The data provides an updated version of data created for the paper Kogan, L., Papanikolaou, D., Seru, A. and Stoffman, N., 2017. Technological innovation, resource allocation, and growth. Quarterly Journal of Economics, 132(2), pp. 665-712.

A detailed description of the data is provided in the paper and the online appendix. If you use these data please cite both of these papers as the data source.

Note that these data include only patents where we have matched the assignee to a firm in CRSP. All other patents are excluded from these data. Complete patent data, currently available for patents granted until 2010, is available here.

Data file and variable definitions



Variable name
Definition
patnum
Patent number
permco
CRSP permco (not permno)
fdate
filing date of patent (mm/dd/yyyy)
idate
issue (grant) date of patent (mm/dd/yyyy)
xi
ξ\xi in millions of nominal dollars. Note that the calculation in this paper differs slightly from what was used in Kogan et al. See the appendix for details.