Maintenance fees coming due
2 maintenance fees come due in the 12 months from Nov 14, 2026, the next on May 12, 2027. Unpaid by Nov 12, 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 10,473,560 | Pipe Core Sampling and Tapping Apparatus In force Fee due May 12, 2027 Lapses if unpaid Nov 12, 2027 · High confidence | Hydra-Stop LLC | In force | May 12, 2027 | Nov 12, 2027 | High confidence | |
| US 10,619,747 | Expanding Gate Valve Assembly with Pressure Equalization System In force Fee due Oct 14, 2027 Lapses if unpaid Apr 14, 2028 · High confidence | Hydra-Stop LLC | In force | Oct 14, 2027 | Apr 14, 2028 | 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.