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→Calculating Expiration
*1995 < appyear <= 2020, expyear = appyear + 4*R + 8*F
In the rare cases when I don't have data on renewals for a patent filed after 1980, I will assume renewal to full term. The vast majority of these data points will be for patents that haven't yet had to renew (a first/second/third time). Thus they are valid beyond the end of my sample.
