Patents as Options: Some Estimates of the Value of Holding European Patent Stocks
作者： Ariel Pakes
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摘要: 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 …
参考文章(1)
Sidney G. Winter, Richard R. Nelson, An Evolutionary Theory of Economic Change Social Science Research Network. ,(1982)