Maintenance fees coming due

Level 3 Communications, LLC

162 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Dec 6, 2026. Unpaid by Jun 7, 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 11,671,328	Systems and Methods for Network Device Management Using Device Clustering Level 3 Communications, LLC In force Fee due Dec 6, 2026 Lapses if unpaid Jun 7, 2027 Term ends Nov 13, 2039 · High confidence	Level 3 Communications, LLC	In force	Dec 6, 2026	Jun 7, 2027	Term ends Nov 13, 2039	High confidence
US 11,671,405	Dynamic Filter Generation and Distribution Within Computer Networks Level 3 Communications, LLC In force Fee due Dec 6, 2026 Lapses if unpaid Jun 7, 2027 Term ends Nov 13, 2039 · High confidence	Level 3 Communications, LLC	In force	Dec 6, 2026	Jun 7, 2027	Term ends Nov 13, 2039	High confidence
US 9,054,981	System and Methods for Identifying and Remedying Traffic Imbalances and Inequities Between Networks Level 3 Communications, LLC In force Fee due Dec 9, 2026 Lapses if unpaid Jun 9, 2027 Term ends May 16, 2033 · High confidence	Level 3 Communications, LLC	In force	Dec 9, 2026	Jun 9, 2027	Term ends May 16, 2033	High confidence
US 9,054,997	Buffer-Less Virtual Routing Level 3 Communications, LLC In force Fee due Dec 9, 2026 Lapses if unpaid Jun 9, 2027 Term ends Sep 3, 2033 · High confidence	Level 3 Communications, LLC	In force	Dec 9, 2026	Jun 9, 2027	Term ends Sep 3, 2033	High confidence
US 10,320,109	Cable Terminator Level 3 Communications, LLC In force Fee due Dec 11, 2026 Lapses if unpaid Jun 11, 2027 Term ends Aug 8, 2036 · High confidence	Level 3 Communications, LLC	In force	Dec 11, 2026	Jun 11, 2027	Term ends Aug 8, 2036	High confidence
US 10,320,629	Illicit Route Viewing System and Method of Operation Level 3 Communications, LLC In force Fee due Dec 11, 2026 Lapses if unpaid Jun 11, 2027 Term ends Sep 25, 2036 · High confidence	Level 3 Communications, LLC	In force	Dec 11, 2026	Jun 11, 2027	Term ends Sep 25, 2036	High confidence
US 10,320,722	Subscription/Notification of a Conference in a Collaboration Conferencing System Level 3 Communications, LLC In force Fee due Dec 11, 2026 Lapses if unpaid Jun 11, 2027 Term ends Aug 7, 2035 · High confidence	Level 3 Communications, LLC	In force	Dec 11, 2026	Jun 11, 2027	Term ends Aug 7, 2035	High confidence
US 11,677,714	Collecting Passive DNS Traffic to Generate a Virtual Authoritative DNS Server Level 3 Communications, LLC In force Fee due Dec 13, 2026 Lapses if unpaid Jun 14, 2027 Term ends Nov 13, 2041 · High confidence	Level 3 Communications, LLC	In force	Dec 13, 2026	Jun 14, 2027	Term ends Nov 13, 2041	High confidence
US 10,326,839	External Injection of Cloud Based Network Functions into Network Services Level 3 Communications, LLC In force Fee due Dec 18, 2026 Lapses if unpaid Jun 21, 2027 Term ends Feb 12, 2034 · High confidence	Level 3 Communications, LLC	In force	Dec 18, 2026	Jun 21, 2027	Term ends Feb 12, 2034	High confidence
US 10,333,796	Wavelength Regeneration in a Network Level 3 Communications, LLC In force Fee due Dec 25, 2026 Lapses if unpaid Jun 25, 2027 Term ends Mar 25, 2032 · Medium confidence	Level 3 Communications, LLC	In force	Dec 25, 2026	Jun 25, 2027	Term ends Mar 25, 2032	Medium confidence
152 more maintenance fees coming due in the 12 months from Nov 14, 2026 · Pro

10 of 162 patents shown. Soonest fee due date first, then patent number.

Pro members see every patent with a maintenance fee coming due: number, title, status, the due date, and the date it lapses if the fee goes unpaid through the grace period.

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Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.