Term ends Dec 18, 2040 · High confidence
20-year base term ends Dec 18, 2040
Held by AdvanSix Resins & Chemicals LLC
Filed Jun 18, 2024 as application 18/746,387 · Granted Jul 8, 2025
Base term, 20 years from filing
Today
2020
2040
Clock starts
Dec 18, 2020
Dec 18, 2020
Term ends
Dec 18, 2040
Dec 18, 2040
Granted
Jul 8, 2025
Jul 8, 2025
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 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.
5
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 3 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 Dec 18, 2020, when application 17/127,033, the earliest non-provisional in its chain, was filed (this one was filed Jun 18, 2024) | Dec 18, 2040 | 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 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 18, 2040 | High confidence |
This family
| US 11,542,428 | In force Dec 2040 | Dec 2040 |
| US 11,891,568 | In force Mar 2041 | Mar 2041 |
| US 12,049,589 | In force Dec 2040 | Dec 2040 |
| US 12,351,756 | this patent Dec 2040 | Dec 2040 |
| US 12,577,452 | In force Dec 2040 | Dec 2040 |
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 |
|---|---|---|---|
| Aug 14, 2026 Reel 76163, frame 178 | Advansix Inc.; Advansix Resins & Chemicals LLC | Citizens Bank, N.A., as Administrative Agent | 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.
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Alerts on its grants, lapses and transfers.
What's changing
Dec 2040
Term ends Dec 18, 2040. Maintenance fees still fall due before then
Citations
2
later US patents cite this one
Fewer than half of the utility patents granted in 2025 in our data have been cited yet, so we show the count and do not rank on it.
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.