Is this patent alive? Maintenance fees and expiration

Answers: is this patent still in force, have its 3.5/7.5/11.5-year maintenance fees been paid, and when does it expire. Returns events (every fee event: paid, reminder, expired, reinstated), windows {"3.5y", "7.5y", "11.5y": paid|due|expired|n/a}, expired (true once a fee lapsed or the term ended), expiration_reason, and expiration_estimate (term_start + 20 years + PTA, where term_start is the earliest filing date the patent claims benefit from under 35 U.S.C. 120/121/365(c), else its own filing date; estimate: true because terminal disclaimers may shorten it). Window values: paid, due (payable now), grace (overdue, surcharge), expired, upcoming (not yet payable), n/a (design/plant/reissue owe no fees); deadlines carries each window's opens/due/surcharge_until dates and next_fee the first unpaid window (null when the patent is not alive).