Lapsed Sep 4, 2024 on the fee record · High confidence
20-year base term ended May 25, 2025
Third maintenance fee unpaid; grace period ended.
Held by Covidien LP
Filed Apr 6, 2009 as application 12/419,031 · Granted Sep 4, 2012
Base term, 20 years from filing, plus 574 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Sep 4, 2024
2005
2026
Clock starts
May 25, 2005
May 25, 2005
No longer in force
Sep 4, 2024
Sep 4, 2024
Granted
Sep 4, 2012
Sep 4, 2012
Term would have run to
Dec 16, 2025
Dec 16, 2025
base term
patent term adjustment
after the term ends
fee events
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
574
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,147,534.
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.
50
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 Dec 16, 2025: its 20-year base term plus 574 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts May 25, 2005, when application 11/136,398, the earliest non-provisional in its chain, was filed (this one was filed Apr 6, 2009) | May 25, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +574 days, USPTO patent term adjustment record | Dec 20, 2026 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,147,534) | capped to Dec 16, 2025 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Sep 4, 2024 | High confidence |
| Computed term end | The steps above, in order | Sep 4, 2024 | High confidence |
This family
| US 8,398,701 | Lapsed on the fee record Mar 2021 | Mar 2021 |
| US 8,147,534 | Lapsed on the fee record Apr 2020 | Apr 2020 |
| US 8,267,985 | In force Jan 2027 | Jan 2027 |
| US 8,617,234 | Term ended Jun 2025 | Jun 2025 |
| Application 11/420,025 | Abandoned not computed | not computed |
| Application PCT/US2007/011551 | PCT application no patent term | no patent term |
| Application PCT/US2007/011666 | PCT application no patent term | no patent term |
| US 8,257,421 | this patent Sep 2024 | Sep 2024 |
8 of 50 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.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Nov 10, 2009 Reel 23497, frame 698 | Berez, Aaron Lee; Tran, Quang Quoc | Chestnut Medical Technologies, Inc. | Assignment of Assignor's Interest |
| Nov 28, 2011 Reel 27285, frame 990 | Chestnut Medical Technologies, Inc. | EV3 Inc. | Merger |
| Nov 28, 2011 Reel 27286, frame 495 | EV3 Inc. | EV3 LLC | Merger |
| Nov 28, 2011 Reel 27285, frame 590 | EV3 LLC | Tyco Healthcare Group LP | Assignment of Assignor's Interest |
| May 17, 2013 Reel 30427, frame 385 | Tyco Healthcare Group LP | Covidien LP | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
The 574 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,147,534.
Citations
122
later US patents cite this one
That is top 5% of utility patents granted in 2012 in our data, the only group it is compared against.
How we rank
Every date shows its work: the base term, any term adjustment or extension, any disclaimer cap, and the maintenance fee record, each with a confidence tier. How this record was built
Computed patent terms end on the dates shown. Related patents and pending applications may cover overlapping subject matter.