Working Paper: NBER ID: w1340
Authors: Ariel Pakes
Abstract: In many countries holders of patents must pay an annual renewal fee in order to keep their patents in force. This paper uses data on the proportion of patents renewed, and the renewal fees faced by, post World War II cohorts of patents in France, the United Kingdom, and Germany, in conjunction with a model of patent holders' renewal decisions, to estimate the returns earned from holding patents in these countries. Since patents are often applied for at a nearly stage in the innovation process, the model allows agents to be uncertain about the sequence of returns that will be earned if the patent is kept inforce. Formally, then, the paper presents and solves a discrete choice optimal stochastic control model, derives the implications of the model on aggregate behaviour, and then estimates the parameters of the model from aggregate data. The estimates enable a detailed description of the evolution of the distribution of returns earned from holding patents over their life spans,and calculations of both; the annual returns earned from holding the patents still in force (or the patent stocks) in the alternative countries, and the distribution of the discounted value of returns earned from holding the patents in a cohort.
Keywords: patents; renewal fees; economic value; innovation
JEL Codes: O31; O34
Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.
| Cause | Effect |
|---|---|
| Expected discounted value of future returns (G17) | Decision to renew a patent (O38) |
| Current returns (G19) | Expected discounted value of future returns (G17) |
| Renewal fee (Q21) | Decision to renew a patent (O38) |
| Exploration of new uses for patented ideas (O36) | Distribution of returns (D39) |