Maintenance fees coming due

Richtek Technology Corp.

18 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 11,658,650	Pulse Width Modulation Controller and Control Method Thereof Richtek Technology Corporation In force Fee due Nov 23, 2026 Lapses if unpaid May 24, 2027 Term ends Apr 18, 2042 · High confidence	Richtek Technology Corporation	In force	Nov 23, 2026	May 24, 2027	Term ends Apr 18, 2042	High confidence
US 9,041,307	Method for Brightness Control Richtek Technology Corp. In force Fee due Nov 26, 2026 Lapses if unpaid May 26, 2027 Term ends Jul 30, 2034 · High confidence	Richtek Technology Corp.	In force	Nov 26, 2026	May 26, 2027	Term ends Jul 30, 2034	High confidence
US 10,326,016	High-Side Power Device and Manufacturing Method Thereof Richtek Technology Corporation In force Fee due Dec 18, 2026 Lapses if unpaid Jun 21, 2027 Term ends Jun 24, 2036 · High confidence	Richtek Technology Corporation	In force	Dec 18, 2026	Jun 21, 2027	Term ends Jun 24, 2036	High confidence
US 9,093,914	Bootstrap Circuit and Method for Controlling the Same Richtek Technology Corp. In force Fee due Jan 28, 2027 Lapses if unpaid Jul 28, 2027 Term ends Apr 18, 2034 · High confidence	Richtek Technology Corp.	In force	Jan 28, 2027	Jul 28, 2027	Term ends Apr 18, 2034	High confidence
US 11,716,020	Scc-Based Dc-Dc Power Conversion System Capable of Receiving Switching Control Adjustable by Output Voltage Thereof, and Power Conversion Method Thereof Richtek Technology Corp. In force Fee due Feb 1, 2027 Lapses if unpaid Aug 2, 2027 Term ends Jan 4, 2042 · High confidence	Richtek Technology Corp.	In force	Feb 1, 2027	Aug 2, 2027	Term ends Jan 4, 2042	High confidence
US 9,106,151	Power-Factor-Improving Circuit and Method for an Offline Converter Richtek Technology Corp. In force Fee due Feb 11, 2027 Lapses if unpaid Aug 11, 2027 Term ends Feb 14, 2033 · High confidence	Richtek Technology Corp.	In force	Feb 11, 2027	Aug 11, 2027	Term ends Feb 14, 2033	High confidence
US 9,130,464	Soft-Start Switching Power Converting Apparatus with Pulse- Frequency Modulation Technique Richtek Technology Corp. In force Fee due Mar 8, 2027 Lapses if unpaid Sep 8, 2027 Term ends Jan 11, 2034 · High confidence	Richtek Technology Corp.	In force	Mar 8, 2027	Sep 8, 2027	Term ends Jan 11, 2034	High confidence
US 11,764,682	Buck Converter with Quick Response Mechanism and Method Thereof Richtek Technology Corp. In force Fee due Mar 19, 2027 Lapses if unpaid Sep 20, 2027 Term ends May 26, 2042 · High confidence	Richtek Technology Corp.	In force	Mar 19, 2027	Sep 20, 2027	Term ends May 26, 2042	High confidence
US 11,792,900	High Resolution Dimmer Circuit Richtek Technology Corp. In force Fee due Apr 17, 2027 Lapses if unpaid Oct 18, 2027 Term ends Oct 25, 2042 · High confidence	Richtek Technology Corp.	In force	Apr 17, 2027	Oct 18, 2027	Term ends Oct 25, 2042	High confidence
US 11,811,320	Power Conversion Circuit Having Short-Circuit Detection Function and Short-Circuit Detection Method Thereof Richtek Technology Corporation In force Fee due May 7, 2027 Lapses if unpaid Nov 8, 2027 Term ends Apr 20, 2042 · High confidence	Richtek Technology Corporation	In force	May 7, 2027	Nov 8, 2027	Term ends Apr 20, 2042	High confidence
8 more maintenance fees coming due in the 12 months from Nov 14, 2026 · Pro

10 of 18 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.