Maintenance fees coming due
5 maintenance fees come due in the 12 months from Nov 15, 2026, the next on Nov 21, 2026. Unpaid by May 21, 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 10,294,085 | Methods and Apparatus for Constructing Glass Furnace Structures In force Fee due Nov 21, 2026 Lapses if unpaid May 21, 2027 · High confidence | Fosbel, Inc. | In force | Nov 21, 2026 | May 21, 2027 | High confidence | |
| US 10,330,315 | Integral Self-Supporting Composite Refractory Wall Modules for Refractory Structures and Methods of Forming Refractory Structure Walls of the Same In force Fee due Dec 25, 2026 Lapses if unpaid Jun 25, 2027 · High confidence | Fosbel, Inc. | In force | Dec 25, 2026 | Jun 25, 2027 | High confidence | |
| US 10,336,942 | Coke Oven Corbel Structures and Methods of Forming the Same In force Fee due Jan 2, 2027 Lapses if unpaid Jul 2, 2027 · High confidence | Fosbel, Inc. | In force | Jan 2, 2027 | Jul 2, 2027 | High confidence | |
| US 10,364,174 | Glass Furnace Regenerators Formed of One-Piece Load-Bearing Wall Blocks In force Fee due Jan 30, 2027 Lapses if unpaid Jul 30, 2027 · High confidence | Fosbel, Inc. | In force | Jan 30, 2027 | Jul 30, 2027 | High confidence | |
| US 10,407,333 | Methods and Apparatus for Constructing Glass Furnace Structures In force Fee due Mar 10, 2027 Lapses if unpaid Sep 10, 2027 · High confidence | Fosbel, Inc. | In force | Mar 10, 2027 | Sep 10, 2027 | 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.