Maintenance fees coming due

Littelfuse, Inc.

125 maintenance fees come due in the 12 months from Nov 14, 2026, the next on Nov 14, 2026. Unpaid by May 14, 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 10,290,457	Inner Cap for High Voltage Fuse Littelfuse, Inc. In force Fee due Nov 14, 2026 Lapses if unpaid May 14, 2027 Term ends Jan 5, 2038 · High confidence	Littelfuse, Inc.	In force	Nov 14, 2026	May 14, 2027	Term ends Jan 5, 2038	High confidence
US 9,048,684	Intelligent High Speed Automatic Transfer Switch Littelfuse, Inc. In force Fee due Dec 2, 2026 Lapses if unpaid Jun 2, 2027 Term ends Dec 12, 2033 · High confidence	Littelfuse, Inc.	In force	Dec 2, 2026	Jun 2, 2027	Term ends Dec 12, 2033	High confidence
US 11,670,440	PPTC Actuator Heater Littelfuse, Inc. In force Fee due Dec 6, 2026 Lapses if unpaid Jun 7, 2027 Term ends Dec 28, 2040 · Medium confidence	Littelfuse, Inc.	In force	Dec 6, 2026	Jun 7, 2027	Term ends Dec 28, 2040	Medium confidence
US 9,053,844	Geometric Configuration or Alignment of Protective Material in a Gap Structure for Electrical Devices Littelfuse, Inc. In force Fee due Dec 9, 2026 Lapses if unpaid Jun 9, 2027 Term ends Jan 15, 2032 · High confidence	Littelfuse, Inc.	In force	Dec 9, 2026	Jun 9, 2027	Term ends Jan 15, 2032	High confidence
US 9,054,587	Non-Isolated Ac-To-Dc Converter Having a Low Charging Current Initial Power Up Mode Littelfuse, Inc. In force Fee due Dec 9, 2026 Lapses if unpaid Jun 9, 2027 Term ends Aug 8, 2032 · High confidence	Littelfuse, Inc.	In force	Dec 9, 2026	Jun 9, 2027	Term ends Aug 8, 2032	High confidence
US 10,319,551	Sealed Fuse Littelfuse, Inc. In force Fee due Dec 11, 2026 Lapses if unpaid Jun 11, 2027 Term ends Oct 12, 2036 · High confidence	Littelfuse, Inc.	In force	Dec 11, 2026	Jun 11, 2027	Term ends Oct 12, 2036	High confidence
US 10,319,669	Packaged Fast Inverse Diode Component For PFC Applications Littelfuse, Inc. In force Fee due Dec 11, 2026 Lapses if unpaid Jun 11, 2027 Term ends Aug 31, 2037 · High confidence	Littelfuse, Inc.	In force	Dec 11, 2026	Jun 11, 2027	Term ends Aug 31, 2037	High confidence
US 11,677,186	Quick Assembly Plug Connector Littelfuse, Inc. In force Fee due Dec 13, 2026 Lapses if unpaid Jun 14, 2027 Term ends Sep 9, 2041 · High confidence	Littelfuse, Inc.	In force	Dec 13, 2026	Jun 14, 2027	Term ends Sep 9, 2041	High confidence
US 10,324,140	Zero Sequence Sensing Apparatus and Method Littelfuse, Inc. In force Fee due Dec 18, 2026 Lapses if unpaid Jun 21, 2027 Term ends Oct 8, 2036 · High confidence	Littelfuse, Inc.	In force	Dec 18, 2026	Jun 21, 2027	Term ends Oct 8, 2036	High confidence
US 10,325,702	Structurally Resilient Positive Temperature Coefficient Material and Method for Making Same Littelfuse, Inc. In force Fee due Dec 18, 2026 Lapses if unpaid Jun 21, 2027 Term ends Nov 5, 2036 · High confidence	Littelfuse, Inc.	In force	Dec 18, 2026	Jun 21, 2027	Term ends Nov 5, 2036	High confidence
115 more maintenance fees coming due in the 12 months from Nov 14, 2026 · Pro

10 of 125 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.