Patent Expiration Rules

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Patent Expiration Rules

Based on the fees paid, we can determine the validity of a patent. Each fee is coded and the DaysIncrement variable indicates how many more days a patent is valid for after that fee is paid. The DaysDuration is how many total days the patent has been valid for since it's grant date. DaysDuration is the key variable, for each fee paid, we add DaysIncrement to DaysDuration. The DaysDuration past the grant date is the validity of the patent. (NOTE: does not seem to distinguish counting from filedate or grant date, only seems to do it from grantdate)

ALSO- keep in mind this is in *allpatentsprocessed* DB, not in the *patent* database.


FeeCode Description DaysIncrement DaysDuration
EXP. Patent Expired for Failure to Pay Maintenance Fees. 0 0
EXPX Patent Reinstated After Maintenance Fee Payment Confirmed. 0 0
M1551 Payment of Maintenance Fee, 4th Year, Large Entity. 1460 2920
M1552 Payment of Maintenance Fee, 8th Year, Large Entity. 1460 4380
M1553 Payment of Maintenance Fee, 12th Year, Large Entity. 2920 7300
M1559 Payment of Maintenance Fee under 1.28(c). 0 0
M170 Payment of Maintenance Fee, 4th Year, PL 96-517. 1460 2920
M171 Payment of Maintenance Fee, 8th Year, PL 96-517. 1460 4380
M172 Payment of Maintenance Fee, 12th Year, PL 96-517. 2920 7300
M173 Payment of Maintenance Fee, 4th Year, PL 97-247. 1460 2920
M174 Payment of Maintenance Fee, 8th Year, PL 97-247. 1460 4380
M175 Payment of Maintenance Fee, 12th Year, PL 97-247 2920 7300
M183 Payment of Maintenance Fee, 4th Year, Large Entity. 1460 2920
M184 Payment of Maintenance Fee, 8th Year, Large Entity. 1460 4380
M185 Payment of Maintenance Fee, 12th Year, Large Entity. 2920 7300
M2551 Payment of Maintenance Fee, 4th Yr, Small Entity. 1460 2920
M2552 Payment of Maintenance Fee, 8th Yr, Small Entity. 1460 4380
M2553 Payment of Maintenance Fee, 12th Yr, Small Entity. 2920 7300
M273 Payment of Maintenance Fee, 4th Yr, Small Entity, PL 97-247. 1460 2920
M274 Payment of Maintenance Fee, 8th Yr, Small Entity, PL 97-247. 1460 4380
M275 Payment of Maintenance Fee,12th Yr, Small Entity, PL 97-247. 2920 7300
M283 Payment of Maintenance Fee, 4th Yr, Small Entity. 1460 2920
M284 Payment of Maintenance Fee, 8th Yr, Small Entity. 1460 4380
M285 Payment of Maintenance Fee, 12th Yr, Small Entity. 2920 7300
M3551 Payment of Maintenance Fee, 4th Year, Micro Entity. 1460 2920
M3552 Payment of Maintenance Fee, 8th Year, Micro Entity. 1460 4380
M3553 Payment of Maintenance Fee, 12th Year, Micro Entity. 2920 7300

Building Start and End Table

Created PatentExpirationRules table using the data shown in the table above. Maintfeeevents is a table with all of the USPTO data on fees paid. The earliest grantdate in this dataset is 1981-09-01 and the latest is 2016-06-28. The earliest feedate is 1980-12-19 and the latest feedate is 5000-01-1 (NO THIS IS NOT A TYPO- someone please fix why we have fees being paid in the year 5000). The second latest feedate is 2016-06-13.