The Patent Finder
US

Oxygen Concentrating Apparatus and Execution Support Method of Home Oxygen Therapy Using the Same

US 8,151,792 Lapsed on the fee record
OverviewFamilyAssignmentsSources & methods

Lapsed Apr 10, 2024 on the fee record · Medium confidence

Why Medium: A parent in the chain could not be resolved.

Third maintenance fee unpaid; grace period ended.

No current holder resolved from the recorded chain.
Filed Jul 16, 2009 as application 12/458,563 · Granted Apr 10, 2012
Base term, 20 years from filing, plus 298 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 10, 2024
2004 2026
Clock starts
Aug 12, 2004
No longer in force
Apr 10, 2024
Granted
Apr 10, 2012
Term would have run to
Jun 6, 2025
base term patent term adjustment 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
298
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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 Jun 6, 2025: its 20-year base term plus 298 days of term adjustment for prosecution delay. 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 12, 2004, when application PCT/JP2004/011865, the earliest non-provisional in its chain, was filed (this one was filed Jul 16, 2009); a parent in its chain could not be resolved (the next row)Aug 12, 2024High confidence
Continuity chainA parent in the chain could not be resolveddated from this application's own claimMedium confidence
Patent term adjustment+298 days, USPTO patent term adjustment recordJun 6, 2025High confidence
Terminal disclaimer capNone on recordno cap appliedHigh confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events2 of 3 maintenance fees paidlapsed Apr 10, 2024High confidence
Computed term endThe steps above, in orderApr 10, 2024Medium confidence

This family

US 7,740,013In force
Sep 2027
Sep 2027
US 8,151,792this patent
Apr 2024
Apr 2024
2 of 3 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 18, 2013
Reel 29660, frame 417
Teijin Pharma LimitedTeijin Pharma LimitedChange of Address
Jan 18, 2013
Reel 29660, frame 489
Teijin Pharma LimitedTeijin LimitedCoporate Split

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