Lapsed Apr 3, 2020 on the fee record · High confidence
20-year base term ended May 25, 2025
Second maintenance fee unpaid; grace period ended.
Held by Covidien LP
Filed May 25, 2005 as application 11/136,398 · Granted Apr 3, 2012
Base term, 20 years from filing, plus 205 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 3, 2020
2005
2026
Clock starts
May 25, 2005
May 25, 2005
No longer in force
Apr 3, 2020
Apr 3, 2020
Granted
Apr 3, 2012
Apr 3, 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
205
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,257,421, US 8,267,985, to Dec 16, 2025. The term already ends on or before that date, so the cap shortened nothing.
1 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 205 days of term adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 this application, 11/136,398, was filed | May 25, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +205 days, USPTO patent term adjustment record | Dec 16, 2025 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,257,421, US 8,267,985) | resolves to Dec 16, 2025, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | lapsed Apr 3, 2020 | High confidence |
| Computed term end | The steps above, in order | Apr 3, 2020 | High confidence |
This family
| US 8,398,701 | Lapsed on the fee record Mar 2021 | Mar 2021 |
| US 8,147,534 | this patent 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 |
|---|---|---|---|
| May 25, 2005 Reel 16606, frame 257 | Berez, Aaron Lee; Tran, Quang Quoc | Chestnut Medical Technologies, Inc. | Assignment of Assignor's Interest |
| Nov 2, 2011 Reel 27165, frame 643 | Chestnut Medical Technologies, Inc. | EV3 Inc. | Merger |
| Nov 2, 2011 Reel 27165, frame 656 | EV3 LLC | Tyco Healthcare Group LP | Assignment of Assignor's Interest |
| Nov 2, 2011 Reel 27168, frame 350 | EV3 Inc. | EV3 LLC | Merger |
| 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 205 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,257,421, US 8,267,985, ends no earlier than this term, so it caps nothing.
Citations
262
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.