168 patents currently held

Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.

The next term ends in Dec 2026. from the record

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

Ending by 2030

Dec 2026

Next term end

161

Patent families

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 20382039204020412042 2043 2044 2045

notable patents fee due within 90 days all others Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

Notable: the highest-ranked patents in this portfolio by citations and family size. Fee due within 90 days: a maintenance fee is due within 90 days of when this page was computed and not yet paid.

Notable patents

Ranked by citations and family size, against patents of the same kind granted the same year. How we rank

Notable

Rectifying-And-Modulating Circuit and Wireless Power Receiver Incorporating the Same US 9,225,196

The most cited patent in this portfolio, cited by 270 later US patents, top 1% of utility patents granted in 2015 in our data. Protection runs to 2033.

Ends Sep 2033 · High confidence Also notable

Control Circuit and Method for a Ripple Regulator System US 8,446,135

Cited by 50 later US patents, top 25% of utility patents granted in 2013 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2032.

Ends Feb 2032 · High confidence Also notable

Self-Discharge Control for an EMI Filter Capacitor US 9,059,585

Cited by 37 later US patents, top 25% of utility patents granted in 2015 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2033.

Ends Jul 2033 · High confidence

Fee deadlines

Maintenance fees fall due 3.5, 7.5 and 11.5 years after grant. A missed fee ends a patent at the end of the six month grace period that follows, not on the due date.

2 fees due Nov 23 to 26, 2026 · next Nov 23
1 fee due Dec 18, 2026
The maintenance fee for High-Side Power Device and Manufacturing Method Thereof (US 10,326,016) comes due Dec 18, 2026. Unpaid by Jun 21, 2027, it lapses early.
1 fee due Jan 28, 2027
The maintenance fee for Bootstrap Circuit and Method for Controlling the Same (US 9,093,914) comes due Jan 28, 2027. Unpaid by Jul 28, 2027, it lapses early.
2 fees due Feb 1 to 11, 2027 · next Feb 1
2 fees due Mar 8 to 19, 2027 · next Mar 8
1 fee due Apr 17, 2027
The maintenance fee for High Resolution Dimmer Circuit (US 11,792,900) comes due Apr 17, 2027. Unpaid by Oct 18, 2027, it lapses early.
2 fees due May 7 to 28, 2027 · next May 7
3 fees due Jun 1 to 29, 2027 · next Jun 1
2 fees due Aug 16 to 23, 2027 · next Aug 16
2 fees due Sep 1 to 15, 2027 · next Sep 1

Which patents, and when each one lapses · Pro

Recent changes

17 of the patents on this record were granted since Aug 16, 2026
5 terms have ended since Aug 16, 2026

What they patent

The 5 largest of its 161 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.

Method for Improving Voltage Identification Transient Response and Voltage Regulator	4 in force	to May 2032
Electronic Device Having Multiple Speakers Controlled by a Single Functional Chip	2 in force	to Jun 2043
Switching Power Converter and Active EMI Filter Circuit Thereof	2 in force	to Jan 2043
High-Side Power Device and Manufacturing Method Thereof	2 in force	to Jun 2036
USB Type-C Cable and Method for Reading/Writing a Chip in a USB Type-C Cable	2 in force	to Dec 2035

Patents held now

Soonest term end first.

Patent	Title	Status	Expires	Confidence
US 7,518,432	Low Noise Multiphase Charge Pump and Control Method Thereof In force Term ends Dec 22, 2026 · High confidence	In force	Term ends Dec 22, 2026	High confidence
US 7,446,431	Multi-Input Single-Output Power Converter and Method Thereof In force Term ends Jan 10, 2027 · High confidence	In force	Term ends Jan 10, 2027	High confidence
US 7,501,805	Circuit and Method for Soft Start from a Residual Voltage In force Term ends Feb 3, 2027 · High confidence	In force	Term ends Feb 3, 2027	High confidence
US 7,474,086	Frequency-On-The-Fly Control Circuit and Method for a Dc/Dc PWM Converter In force Term ends Apr 9, 2027 · High confidence	In force	Term ends Apr 9, 2027	High confidence
US 7,701,190	Control Circuit and Method for a Dc-To-Dc Converter to Improve Transient Response Thereof In force Term ends Apr 13, 2027 · High confidence	In force	Term ends Apr 13, 2027	High confidence
US 7,436,158	Low-Gain Current-Mode Voltage Regulator held by Richtek Technology Corp. and Infineon Technologies AG In force Term ends Apr 16, 2027 · High confidence	In force	Term ends Apr 16, 2027	High confidence
US 7,474,141	Mode Transition Control Method and Circuit for a Charge Pump In force Term ends Aug 22, 2027 · High confidence	In force	Term ends Aug 22, 2027	High confidence
US 7,701,305	Frequency Jittering Control for Varying the Switching Frequency of a Power Supply In force Term ends Sep 17, 2027 · High confidence	In force	Term ends Sep 17, 2027	High confidence
US 7,535,690	Arrangement and Method for an Integrated Protection for a Power System In force Term ends Oct 12, 2027 · High confidence	In force	Term ends Oct 12, 2027	High confidence
US 7,557,553	Power Supply Circuit and Control Method Thereof In force Term ends Dec 21, 2027 · High confidence	In force	Term ends Dec 21, 2027	High confidence

10 of 168 patents shown.

Pro members see all 168.

Pro members: see all 168 patents

Also on record, not counted in the 168: 179 patents ended · 50 applications pending · 79 applications abandoned. List them

Sources and methods

Compiled from USPTO application file histories, grants and recorded assignments, with the company's own names reviewed by hand. How this record was built

Portfolio grouped automatically from ownership conveyances to the names matched to this company, usually every name that begins with its own, so it counts patents an affiliate holds; each list row names the holder of record. Security interests are excluded and ambiguous records are not reviewed by hand.

Fee due within 90 days marks a patent with a maintenance fee due within 90 days of the date this page was computed and not yet recorded paid, so it can end earlier than the bar shows. A fee left unpaid ends the patent at the close of the six month grace period that follows its due date, not on the due date itself. It is not a prediction that the fee will be missed.

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

Export every term end as CSV · Pro

Richtek Technology Corp.