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Patent start date end date project

Patent Maintenance Fee Schedule
https://www.uspto.gov/learning-and-resources/fees-and-payment/uspto-fee-schedule#Patent Maintenance Fee

Fees need to be paid 3.5 ~4, 7.5 ~8, and 11.5 ~12 years after grant
After some time, t, patents are valid from the grant date to 20 years after the application date.
Before t, patents are valid from the application date to 18 years before the grant date.

'''I don’t know what happens when people don’t pay maintenance fees.'''

There is enough information in the patent and feestatus table to create a patentStartdateEnddate table.

Table we want to make:

Table "public.patentstartdateenddate"
Column | Type | Modifiers
--------+-------------------+-----------
patent | character varying |
start | date |
end | date |

Methodology:
Take the patentID from the ''patent'' table.
Check if a fee has been paid within a certain date range using the ''feestatus'' table.
The date range will have to be determined by learning about the rules around maintenance fees.
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