Maintenance fees coming due
3 maintenance fees come due in the 12 months from Nov 15, 2026, the next on Apr 30, 2027. Unpaid by Nov 1, 2027, that one lapses early.
A maintenance fee does not end a patent on its due date. It falls due at 3.5, 7.5
and 11.5 years from grant, and the patent lapses only if the fee is still unpaid at the end of the
six month grace period that follows.
| Patent | Title | Holder | Status | Fee due | Lapses if unpaid | Expires | Confidence |
|---|---|---|---|---|---|---|---|
| US 11,801,599 | Method for Designing Special Function Robots In force Fee due Apr 30, 2027 Lapses if unpaid Nov 1, 2027 · High confidence | Xtend AI Inc. | In force | Apr 30, 2027 | Nov 1, 2027 | High confidence | |
| US 11,815,895 | Method of Offline Operation of an Intelligent, Multi-Function Robot In force Fee due May 14, 2027 Lapses if unpaid Nov 15, 2027 · High confidence | Xtend AI Inc. | In force | May 14, 2027 | Nov 15, 2027 | High confidence | |
| US 11,872,512 | Robot Air Filter In force Fee due Jul 16, 2027 Lapses if unpaid Jan 18, 2028 · High confidence | Xtend AI Inc. | In force | Jul 16, 2027 | Jan 18, 2028 | High confidence |
3 of 3 patents shown. Soonest fee due date first, then patent number.
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.