Maintenance fees coming due

Epirus, Inc.

4 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Nov 23, 2026. Unpaid by May 24, 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 11,658,410	Apparatus and Method for Synchronizing Power Circuits with Coherent RF Signals to Form a Steered Composite RF Signal Epirus, Inc. In force Fee due Nov 23, 2026 Lapses if unpaid May 24, 2027 Term ends Feb 24, 2041 · High confidence	Epirus, Inc.	In force	Nov 23, 2026	May 24, 2027	Term ends Feb 24, 2041	High confidence
US 11,799,327	Systems and Methods for Wireless Power Delivery Epirus, Inc. In force Fee due Apr 24, 2027 Lapses if unpaid Oct 25, 2027 Term ends Feb 23, 2042 · High confidence	Epirus, Inc.	In force	Apr 24, 2027	Oct 25, 2027	Term ends Feb 23, 2042	High confidence
US 11,811,472	Systems and Methods for Improving Power Efficiency Epirus, Inc. In force Fee due May 7, 2027 Lapses if unpaid Nov 8, 2027 Term ends Jun 29, 2041 · Medium confidence	Epirus, Inc.	In force	May 7, 2027	Nov 8, 2027	Term ends Jun 29, 2041	Medium confidence
US 11,936,347	Systems and Methods for Driving Semiconductor Devices and Sensing Device Parameters Epirus, Inc. In force Fee due Sep 19, 2027 Lapses if unpaid Mar 20, 2028 Term ends Jun 13, 2042 · High confidence	Epirus, Inc.	In force	Sep 19, 2027	Mar 20, 2028	Term ends Jun 13, 2042	High confidence

4 of 4 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.