Maintenance fees coming due
2 maintenance fees come due in the 12 months from Nov 15, 2026, the next on May 21, 2027. Unpaid by Nov 22, 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 11,820,482 | Method and Apparatus for Lighter-Than-Air Airship with Improved Structure and Delivery System In force Fee due May 21, 2027 Lapses if unpaid Nov 22, 2027 · High confidence | H2 Clipper, Inc. | In force | May 21, 2027 | Nov 22, 2027 | High confidence | |
| US 11,851,214 | Improved System, Method and Apparatus for Airship Manufacture Using Robotics In force Fee due Jun 26, 2027 Lapses if unpaid Dec 27, 2027 · High confidence | H2 Clipper, Inc. | In force | Jun 26, 2027 | Dec 27, 2027 | High confidence |
2 of 2 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.