Also listed on Chestnut Medical Technologies, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 14, 2026 · High confidence
20-year base term ended May 25, 2025
Held by Covidien LP
Filed Feb 29, 2012 as application 13/407,835 · Granted Aug 4, 2015
Base term plus 568 days of patent term adjustment (USPTO delay)
Today
2005
2026
Clock starts
May 25, 2005
May 25, 2005
Term ends
Dec 14, 2026
Dec 14, 2026
Granted
Aug 4, 2015
Aug 4, 2015
base term
patent term adjustment
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
568
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 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. 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.
This patent's term runs 568 days past its 20-year base term on prosecution delay. 2 of 2 maintenance fees are paid so far. 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 Feb 29, 2012) | May 25, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +568 days, USPTO patent term adjustment record | Dec 14, 2026 | High confidence |
| Terminal disclaimer cap | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 14, 2026 | 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 | Lapsed on the fee record 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 |
|---|---|---|---|
| Jul 16, 2019 Reel 49763, frame 342 | Berez, Aaron Lee; Tran, Quang Quoc | Chestnut Medical Technologies, Inc. | Assignment of Assignor's Interest |
| Jul 16, 2019 Reel 49763, frame 435 | Chestnut Medical Technologies, Inc. | EV3 Inc. | Merger |
| Jul 16, 2019 Reel 49763, frame 498 | EV3 Inc. | EV3 LLC | Change of Name |
| Jul 16, 2019 Reel 49763, frame 501 | EV3 LLC | Tyco Healthcare Group LP | Assignment of Assignor's Interest |
| Jul 16, 2019 Reel 49768, frame 254 | 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
Dec 2026
Term ends Dec 14, 2026. No further fees fall due before then
Note
The 568 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
18
later US patents cite this one
That is top 25% of utility patents granted in 2015 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.