Patents as Options: Some Estimates of the Value of Holding European Patent Stocks
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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
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美国国家经济研究局创建时间：
1984-04-01
