The Patent Finder
US

High-Efficiency, Low-Power Power Supply Circuit

US 9,225,260 Lapsed on the fee record
OverviewFamilyAssignmentsSources & methods

Lapsed Dec 29, 2019 on the fee record · Medium confidence

Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.

First maintenance fee unpaid; grace period ended.

Held by Ixys, LLC
Filed Aug 8, 2012 as application 13/569,458 · Granted Dec 29, 2015
Base term, 20 years from filing, plus 584 days of patent term adjustment (USPTO delay)
Today
Lapsed Dec 29, 2019
2012 2034
Clock starts
Aug 8, 2012
No longer in force
Dec 29, 2019
Granted
Dec 29, 2015
Term would have run to
Mar 15, 2034
base term patent term adjustment after the term ends 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
584
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
0 of 3
Maintenance fees paid
Three maintenance fees fall due, at 3.5, 7.5 and 11.5 years from grant. This counts the ones the record shows paid.
3
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

Its term would have run to Mar 15, 2034: its 20-year base term plus 584 days of term adjustment for prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. Confidence: Medium. from the record

How we calculated this date

One row per rule, each showing its own input and what it did to the date. A step we could not verify says so instead of resolving itself.
StepInputDate after this stepConfidence
Base term, 20 years from filingClock starts Aug 8, 2012, when this application, 13/569,458, was filedAug 8, 2032High confidence
Continuity chainEvery parent in the chain resolvedno changeHigh confidence
Patent term adjustment+584 days, USPTO patent term adjustment recordMar 15, 2034High confidence
Terminal disclaimer capDisclaimer on file (approved), reference document not resolvedno cap applied, and none guessedMedium confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events0 of 3 maintenance fees paidlapsed Dec 29, 2019High confidence
Computed term endThe steps above, in orderDec 29, 2019Medium confidence

This family

US 9,225,260this patent
Dec 2019
Dec 2019
US 9,054,587In force
Aug 2032
Aug 2032
US 9,571,003Lapsed on the fee record
Feb 2025
Feb 2025
The applications whose file history this site holds. The family may have others.

Assignments

Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.
RecordedAssignorAssigneeConveyance
Aug 8, 2012
Reel 28748, frame 168
Neyman, Leonid A.Ixys CorporationAssignment of Assignor's Interest
Mar 31, 2018
Reel 45406, frame 646
Ixys Corporation; Ixys, LLCIxys, LLCMerger and Change of Name

Sources

Google Patents · The patent document at USPTO · Assignment records at USPTO

USPTO account required: This application in Patent Center · USPTO's maintenance fee lookup

Maintenance fee events come from USPTO's own fee records. Its fee lookup asks for the patent number and the application number.

The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited