282 patents currently held
2 more in force are now held by other companies
Held is read from USPTO's recorded assignments; a transfer never recorded there does not appear.
The next term ends in Mar 2027. from the record
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
24
Ending by 2030
Mar 2027
Next term end
172
Patent families
When these terms end
Held patents by the year their term ends
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
Ends no later than Dec 2039 · Low confidence
Also notable
Ends Nov 2038 · High confidence
Also notable
Ends Oct 2030 · High confidence
Mode Operation Detection for Control of a Power Converter with an Active Clamp Switch
US 11,632,054
Cited by 16 later US patents, top 5% of utility patents granted in 2023 in our data. Protection runs to 2039. A terminal disclaimer is on file and its reference is not resolved, so no cap is applied and the date may move earlier, never later.
Communications Using an Inductive Coupling
US 10,574,302
Cited by 40 later US patents, top 5% of utility patents granted in 2020 in our data. Protection runs to 2038.
Method and Apparatus for Implementing a Power Converter Input Terminal Voltage Discharge Circuit
US 8,115,457
Cited by 41 later US patents, top 25% of utility patents granted in 2012 in our data, and renewed at 3 of 3 maintenance windows. Protection runs to 2030.
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.
- 3 fees due Nov 16 to 21, 2026 · next Nov 16
- 3 fees due Dec 18 to 23, 2026 · next Dec 18
- 4 fees due Jan 4 to 23, 2027 · next Jan 4
- 4 fees due Feb 8 to 20, 2027 · next Feb 8
- 5 fees due Mar 3 to 29, 2027 · next Mar 3
- 9 fees due Apr 1 to 30, 2027 · next Apr 1
- 6 fees due May 3 to 26, 2027 · next May 3
- 3 fees due Jun 3 to 19, 2027 · next Jun 3
- 3 fees due Jul 26 to 30, 2027 · next Jul 26
- 6 fees due Aug 4 to 25, 2027 · next Aug 4
- 7 fees due Sep 1 to 26, 2027 · next Sep 1
- 5 fees due Oct 5 to 28, 2027 · next Oct 5
- 4 fees due Nov 3 to 7, 2027 · next Nov 3
Recent changes
- 4 of the patents on this record were granted since Aug 16, 2026
- 4 terms have ended since Aug 16, 2026
What they patent
The 5 largest of its 172 families, grouped by real patent family and labeled by the earliest filing in each. No technology classification is inferred from titles.
| Cascode Circuit Employing a Depletion-Mode, Gan-Based Fet | 9 in force | to Mar 2034 |
| Clamp for a Hybrid Switch | 6 in force | to Aug 2036 |
| Magnetically Coupled Galvanically Isolated Communication Using Lead Frame | 6 in force | to Jun 2033 |
| Protective Insulator for Hfet Devices | 5 in force | to Apr 2036 |
| Techniques for Controlling a Power Converter Using Multiple Controllers | 5 in force | to Nov 2033 |
Patents held now
Soonest term end first.
| Patent | Title | Status | Expires | Confidence |
|---|---|---|---|---|
| US 7,696,540 | Structure and Method for a Fast Recovery Rectifier Structure In force · High confidence | In force | High confidence | |
| US 7,501,670 | Cascode Circuit Employing a Depletion-Mode, Gan-Based Fet In force · High confidence | In force | High confidence | |
| US 7,468,536 | Gate Metal Routing for Transistor with Checkerboarded Layout In force · High confidence | In force | High confidence | |
| US 7,518,885 | A Control Circuit with Multiple Operation Modes In force · High confidence | In force | High confidence | |
| US 7,602,228 | Half-Bridge Circuits Employing Normally on Switches and Methods of Preventing Unintended Current Flow Therein In force · High confidence | In force | High confidence | |
| US 7,471,530 | Method and Apparatus to Reduce Audio Frequencies in a Switching Power Supply In force · High confidence | In force | High confidence | |
| US 7,576,528 | Method and Appartus for a Control Circuit Responsive to an Impedance Coupled to a Control Circuit Terminal In force · High confidence | In force | High confidence | |
| US 7,567,066 | Integrated Switch with Internally Adjusted Conduction Time In force · High confidence | In force | High confidence | |
| US 7,557,406 | Segmented Pillar Layout for a High-Voltage Vertical Transistor In force · High confidence | In force | High confidence | |
| US 7,875,962 | Package for a Power Semiconductor Device In force · High confidence | In force | High confidence |
Also on record, not counted in the 282: 2 patents in force now held by others · 531 patents ended · 41 applications pending · 67 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.