Lapsed Mar 27, 2026 on the fee record · Medium confidence
20-year base term ends Feb 8, 2028
Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.
Second maintenance fee unpaid; grace period ended.
Held by KCI Licensing, Inc.
Filed Apr 10, 2015 as application 14/683,412 · Granted Mar 27, 2018
Base term, 20 years from filing, plus 438 days of patent term adjustment (USPTO delay)
Today
Lapsed Mar 27, 2026
2008
2029
Clock starts
Feb 8, 2008
Feb 8, 2008
No longer in force
Mar 27, 2026
Mar 27, 2026
Granted
Mar 27, 2018
Mar 27, 2018
Term would have run to
Apr 21, 2029
Apr 21, 2029
base term
patent term adjustment
after the term ends
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
438
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.
1 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.
11
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 Apr 21, 2029: its 20-year base term plus 438 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 Feb 8, 2008, when application 12/069,262, the earliest non-provisional in its chain, was filed (this one was filed Apr 10, 2015) | Feb 8, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +438 days, USPTO patent term adjustment record | Apr 21, 2029 | 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 | 1 of 2 maintenance fees paid | lapsed Mar 27, 2026 | High confidence |
| Computed term end | The steps above, in order | Mar 27, 2026 | Medium confidence |
This family
| US 8,007,257 | Lapsed on the fee record Aug 2023 | Aug 2023 |
| US 8,535,283 | Lapsed on the fee record Sep 2025 | Sep 2025 |
| US 8,287,507 | In force May 2029 | May 2029 |
| US 8,679,079 | Lapsed on the fee record Mar 2026 | Mar 2026 |
| US 8,986,267 | In force no later than Feb 2028 | no later than Feb 2028 |
| US 9,028,458 | In force Feb 2028 | Feb 2028 |
| US 9,561,312 | Lapsed on the fee record Feb 2025 | Feb 2025 |
| US 9,925,312 | this patent Mar 2026 | Mar 2026 |
8 of 11 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 |
|---|---|---|---|
| Apr 14, 2015 Reel 35407, frame 489 | Heaton, Keith Patrick; Hardman, Ian James | KCI Licensing, Inc. | Assignment of Assignor's Interest |
| Sep 21, 2016 Reel 40098, frame 268 | KCI USA, Inc.; Lifecell Corporation; KCI Licensing, Inc. | Wilmington Trust, National Association, as Collateral Agent | Second Lien Security Agreement |
| Oct 7, 2016 Reel 40291, frame 237 | KCI USA, Inc.; Lifecell Corporation; KCI Licensing, Inc. | Wilmington Trust, National Association, as Collateral Agent | Limited Third Lien Intellectual Property Security Agreement |
| Feb 8, 2017 Reel 41666, frame 320 | Wilmington Trust | KCI USA, Inc. | Release of Security Interest Reel/Frame 040098/0268 |
| Nov 7, 2019 Reel 50966, frame 547 | Wilmington Trust, National Association | KCI USA, Inc.; KCI Licensing, Inc. | Release of Security Interest in Patents |
| Nov 7, 2019 reel/frame not recorded | Wilmington Trust, National Association | KCI USA, Inc. | Release of Security Interest in Patents |
| Nov 7, 2019 reel/frame not recorded | Wilmington Trust, National Association | KCI Licensing, Inc. | Release of Security Interest in Patents |
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 438 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 Mar 27, 2026. We will not guess the cap.
Citations
4
later US patents cite this one
That is above the median of utility patents granted in 2018 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.