The Patent Finder
US

Gate Driver with Level Shift Circuit and Method of Manufacturing Thereof

US 6,638,808 Term ended
OverviewFamilyAssignmentsSources & methods

Term ended Jan 28, 2023 · High confidence

Filed Jan 28, 2003 as application 10/353,722 · Granted Oct 28, 2003
Base term, 20 years from filing
Today
20 years from filing
Term ended Jan 28, 2023
2003 2026
Clock starts
Jan 28, 2003
Term ended
Jan 28, 2023
Granted
Oct 28, 2003
base term after the term ends fee events Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
10
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term is its 20-year base term, with no adjustment for prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. Confidence: High. 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 Jan 28, 2003, when this application, 10/353,722, was filedJan 28, 2023High confidence
Continuity chainEvery parent in the chain resolvedno changeHigh confidence
Patent term adjustmentNone on fileno changeHigh confidence
Terminal disclaimer capNone on recordno cap appliedHigh confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events3 of 3 maintenance fees paidterm endedHigh confidence
Computed term endThe steps above, in orderJan 28, 2023High confidence

This family

US 6,771,056Term ended
Oct 2022
Oct 2022
US 6,670,216Term ended
Oct 2022
Oct 2022
US 6,759,692Term ended
Mar 2023
Mar 2023
US 6,638,808this patent
Jan 2023
Jan 2023
US 7,071,537Term ended
May 2023
May 2023
US 7,005,734Term ended
Jun 2023
Jun 2023
US 8,093,652Term ended
Aug 2023
Aug 2023
US 7,063,975Term ended
Oct 2023
Oct 2023
8 of 10 applications in this family shown, earliest filings first. 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
Jan 28, 2003
Reel 13719, frame 791
Ochi, Sam SeiichiroIxys CorporationAssignment of Assignor's Interest
Mar 31, 2018
Reel 45406, frame 600
Ixys Corporation; Ixys, LLCIxys, LLCMerger and Change of Name
May 1, 2019
Reel 49056, frame 649
Ixys, LLCLittelfuse, Inc.Assignment of Assignor's Interest

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 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited