Siliconix Incorporated

9 patents currently held · Updated Nov 15, 2026

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

Recorded under 5 name spellings.

Ending by 2030

Feb 2038

Next term end

When these terms end

5 yrs10 yrs20 yrs

Held patents by the year their term ends

20262027202820292030203120322033203420352036203720382039204020412042204320442045

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.

1 fee due May 19, 2027
The maintenance fee for Power Semiconductor Device with Optimized Field-Plate Design (US 10,483,356) comes due May 19, 2027. Unpaid by Nov 19, 2027, it lapses early.

Which patents, and when each one lapses · Pro

Recent changes

Nothing was recorded against this company's patents in the last 90 days.

Patents held now

Soonest term end first. Each date below is computed on that patent's own page, which shows the rule, the adjustments and the fee history it was derived from.

Showing 1 to 9 of 9

Patent	Title	Status	Expires	Confidence
US 10,483,356	Power Semiconductor Device with Optimized Field-Plate Design In force Term ends Feb 27, 2038 · High confidence	In force	Term ends Feb 27, 2038	High confidence
US 11,189,702	Split gate semiconductor with non-uniform trench oxide In force Term ends Jan 30, 2039 · From the USPTO record	In force	Term ends Jan 30, 2039	From the USPTO record
US 11,295,949	Virtual wafer techniques for fabricating semiconductor devices In force Term ends Apr 1, 2039 · From the USPTO record	In force	Term ends Apr 1, 2039	From the USPTO record
US 11,217,541	Transistors with electrically active chip seal ring and methods of manufacture In force Term ends May 8, 2039 · From the USPTO record	In force	Term ends May 8, 2039	From the USPTO record
US 10,950,699	Termination for vertical trench shielded devices In force Term ends Aug 5, 2039 · From the USPTO record	In force	Term ends Aug 5, 2039	From the USPTO record
US 11,218,144	Semiconductor device with multiple independent gates In force Term ends Sep 12, 2039 · From the USPTO record	In force	Term ends Sep 12, 2039	From the USPTO record
US 12,224,232	Semiconductor package having side wall plating In force Term ends Oct 9, 2040 · From the USPTO record	In force	Term ends Oct 9, 2040	From the USPTO record
US 12,211,704	Semiconductor package having side wall plating In force Term ends Nov 19, 2040 · From the USPTO record	In force	Term ends Nov 19, 2040	From the USPTO record
US 12,635,176	Termination Structure In force Term ends May 14, 2044 · High confidence	In force	Term ends May 14, 2044	High confidence

Also on record, not counted in the 9: 4 lapsed for an unpaid fee · 254 ended at full term. List them

Sources and methods

Compiled from the USPTO record, grants, published applications and recorded assignments, not yet reviewed by hand. How this record was built

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

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Published applications

US patent applications published under this name that have not become patents. An application is published about eighteen months after its earliest filing; one that has not been published is in no public record.

1 pending · 4 no status recorded

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