Description Usage Format Source References
Dataset of US patents that start at 1980 to 1999 and have been cited at least 20 times, frequency distribution in years is given
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A dataframe of 3245 patents, each of 20 years frequency citation distribution
United State Patents and Trademark Office, 2005
Hall, B. H., Jaffe, A. B. and Tratjenberg, M. (2001) The NBER patent citation data file: Lessons, insights and methodological tools. NBER Working Paper 8498, NBER. http://papers.nber.org/papers/w8498.pdf.
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