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→Calculating Expiration
*1981 <= appyear <= 1995, expyear = gyear + 4*R + 5*F
*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.
