Maintenance fees coming due
5 maintenance fees come due in the 12 months from Nov 15, 2026, the next on Apr 17, 2027. Unpaid by Oct 18, 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 11,787,148 | Honeycomb Core Sandwich Panels In force Fee due Apr 17, 2027 Lapses if unpaid Oct 18, 2027 · High confidence | Bell Textron Inc. | In force | Apr 17, 2027 | Oct 18, 2027 | High confidence | |
| US 11,827,333 | Object Impact Protection for an Aircraft In force Fee due May 28, 2027 Lapses if unpaid Nov 29, 2027 · High confidence | Bell Textron Inc. | In force | May 28, 2027 | Nov 29, 2027 | High confidence | |
| US 10,526,068 | Tiltrotor Aircraft having Rotary and Non Rotary Flight Modes In force Fee due Jul 7, 2027 Lapses if unpaid Jan 7, 2028 · Medium confidence | Bell Textron Inc. | In force | Jul 7, 2027 | Jan 7, 2028 | Medium confidence | |
| US 11,965,376 | Hinged Door Open Plunger In force Fee due Oct 23, 2027 Lapses if unpaid Apr 24, 2028 · High confidence | Bell Textron Inc. | In force | Oct 23, 2027 | Apr 24, 2028 | High confidence | |
| US 11,975,868 | System and Method of Monitoring Reduced Performance In force Fee due Nov 7, 2027 Lapses if unpaid May 8, 2028 · High confidence | Bell Textron Inc. | In force | Nov 7, 2027 | May 8, 2028 | High confidence |
5 of 5 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.