Collateral for a security interest recorded Jul 13, 2026 (Biopharma Credit PLC).
Term ends Feb 25, 2034 · Medium confidence
20-year base term ends Feb 25, 2034
Why Medium: A parent in the chain could not be resolved.
Held by West Affum Holdings Dac
Filed Nov 14, 2015 as application 14/941,591 · Granted Mar 14, 2017
Base term, 20 years from filing
Today
2014
2034
Clock starts
Feb 25, 2014
Feb 25, 2014
Term ends
Feb 25, 2034
Feb 25, 2034
Granted
Mar 14, 2017
Mar 14, 2017
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
20
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 is its 20-year base term, with no adjustment for prosecution delay. 2 of 3 maintenance fees are paid so far. 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 Feb 25, 2014, when application 14/189,789, the earliest non-provisional in its chain, was filed (this one was filed Nov 14, 2015); a parent in its chain could not be resolved (the next row) | Feb 25, 2034 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | None on file | no change | 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 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Feb 25, 2034 | Medium confidence |
This family
| US 9,089,685 | In force Feb 2034 | Feb 2034 |
| Application 14/461,670 | Abandoned not computed | not computed |
| Application 14/743,882 | Abandoned not computed | not computed |
| US 9,592,403 | this patent Feb 2034 | Feb 2034 |
| US 9,757,579 | In force Feb 2034 | Feb 2034 |
| US 9,757,581 | In force Aug 2034 | Aug 2034 |
| US 10,016,614 | In force Feb 2034 | Feb 2034 |
| US 10,500,403 | In force Feb 2034 | Feb 2034 |
8 of 20 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 21, 2015 Reel 37110, frame 220 | Physio-Control Development Co., LLC | West Affum Holdings Corp. | Assignment of Assignor's Interest |
| Nov 21, 2015 Reel 37110, frame 223 | Sullivan, Joseph L. | Physio-Control Development Co., LLC | Assignment of Assignor's Interest |
| Nov 8, 2017 Reel 44413, frame 278 | Physio-Control Development Co., LLC | West Affum Holdings Corp. | Assignment of Assignor's Interest |
| Sep 28, 2020 Reel 53910, frame 783 | West Affum Holdings Corp. | Kennedy Lewis Management LP, as Agent | Intellectual Property Security Agreement |
| Jun 15, 2022 Reel 60389, frame 694 | West Affum Holdings Corp. | West Affum Holdings Dac | Assignment of Assignor's Interest |
| Oct 3, 2023 Reel 65107, frame 149 | Kennedy Lewis Management LP. | West Affum Holdings Corp. | Release of Security Interest |
| Oct 4, 2023 Reel 65116, frame 49 | West Affum Holdings Designated Activity Company | Perceptive Credit Holdings IV, LP | Security Agreement |
| Jul 11, 2026 Reel 75954, frame 207 | Perceptive Credit Holdings IV, LP | West Affum Holdings Designated Activity Company | Release of Security Interest |
| Jul 13, 2026 Reel 76371, frame 740 | West Affum Holdings Designated Activity Company | Biopharma Credit PLC, as Collateral Agent | Patent Security Agreement |
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.
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Alerts on its grants, lapses and transfers.
What's changing
Feb 2034
Term ends Feb 25, 2034. Maintenance fees still fall due before then
Citations
170
later US patents cite this one
That is top 5% of utility patents granted in 2017 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.