Collateral for a security interest recorded Dec 19, 2025 (Wells Fargo Bank, National Association).
Term ends Nov 29, 2036 · High confidence
20-year base term ends Nov 29, 2036
Filed Apr 15, 2023 as application 18/135,132 · Granted Apr 28, 2026
Base term, 20 years from filing
Today
2016
2036
Clock starts
Nov 29, 2016
Nov 29, 2016
Term ends
Nov 29, 2036
Nov 29, 2036
Granted
Apr 28, 2026
Apr 28, 2026
base term
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.
0 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.
4
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. 0 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 Nov 29, 2016, when application PCT/US2016/063916, the earliest non-provisional in its chain, was filed (this one was filed Apr 15, 2023) | Nov 29, 2036 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High 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 | 0 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Nov 29, 2036 | High confidence |
This family
| Application PCT/US2016/063916 | PCT application no patent term | no patent term |
| Application 15/778,778 | Abandoned not computed | not computed |
| Application 18/135,130 | Abandoned not computed | not computed |
| US 12,612,491 | this patent Nov 2036 | Nov 2036 |
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 |
|---|---|---|---|
| Jan 23, 2024 Reel 66210, frame 129 | Polk, James E; Schwier, Chris E; Sen, Ashish; Trask, Craig A; Uzunpinar, Cihan; Wang, Chie-hsiung; Zabcik, J. Marty | Ascend Performance Materials Operations LLC | Assignment of Assignor's Interest |
| Dec 19, 2025 Reel 74007, frame 183 | Ascend Performance Materials Operations LLC | Wells Fargo Bank, National Association | Security Interest |
| Dec 23, 2025 Reel 74056, frame 183 | Ascend Performance Materials Operations LLC | Wilmington Savings Fund Society, FSB | Security 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
Nov 2036
Term ends Nov 29, 2036. Maintenance fees still fall due before then
Citations
We have no citation count for this patent yet. That is not the same as never having been cited.
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.