Lapsed Apr 16, 2025 on the fee record · Medium confidence
20-year base term ended Mar 3, 2025
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
Third maintenance fee unpaid; grace period ended.
Held by Covidien LP
Filed Jun 20, 2008 as application 12/143,358 · Granted Apr 16, 2013
Base term, 20 years from filing, plus 1335 days of patent term adjustment (USPTO delay)
Today
Lapsed Apr 16, 2025
2005
2028
Clock starts
Mar 3, 2005
Mar 3, 2005
No longer in force
Apr 16, 2025
Apr 16, 2025
Granted
Apr 16, 2013
Apr 16, 2013
Term would have run to
Oct 28, 2028
Oct 28, 2028
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
1,335
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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.
4
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 Oct 28, 2028: its 20-year base term plus 1335 days of term adjustment for prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 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.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Mar 3, 2005, when application 11/072,682, the earliest non-provisional in its chain, was filed (this one was filed Jun 20, 2008) | Mar 3, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1335 days, USPTO patent term adjustment record | Oct 28, 2028 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | lapsed Apr 16, 2025 | High confidence |
| Computed term end | The steps above, in order | Apr 16, 2025 | Medium confidence |
This family
| US 7,392,075 | In force Nov 2026 | Nov 2026 |
| US 8,423,109 | this patent Apr 2025 | Apr 2025 |
| US 8,818,475 | Term ended Mar 2025 | Mar 2025 |
| US 9,351,674 | Term ended Mar 2025 | Mar 2025 |
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 |
|---|---|---|---|
| Jun 20, 2008 Reel 21129, frame 773 | Baker, Clark R., JR | Nellcor Puritan Bennett Incorporated | Assignment of Assignor's Interest |
| Nov 5, 2012 Reel 29247, frame 329 | Nellcor Puritan Bennett Incorporated | Nellcor Puritan Bennett LLC | Change of Name |
| Nov 14, 2012 Reel 29293, frame 794 | Nellcor Puritan Bennett LLC | Covidien LP | Assignment of Assignor's Interest |
| Nov 18, 2012 Reel 29317, frame 260 | Nellcor Puritan Bennett LLC | Covidien LP | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 1335 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Apr 16, 2025. We will not guess the cap.
Citations
22
later US patents cite this one
That is top 25% of utility patents granted in 2013 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.