Also listed on Elementis SRL, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Oct 7, 2036 · Low confidence
20-year base term ends Oct 7, 2036
Held by Elementis Specialties, Inc.
Filed Jun 8, 2021 as application 17/341,895 · Granted Apr 25, 2023
Base term plus 133 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2016
2036
Clock starts
Oct 7, 2016
Oct 7, 2016
Term ends
Oct 7, 2036
Oct 7, 2036
Granted
Apr 25, 2023
Apr 25, 2023
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
133
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 10,022,691, US 11,052,361.
1 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.
3
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 runs 133 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 1 of 3 maintenance fees is paid so far. Confidence: Low. 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 Oct 7, 2016, when application 15/287,852, the earliest non-provisional in its chain, was filed (this one was filed Jun 8, 2021); a parent in its chain could not be resolved (the next row) | Oct 7, 2036 | 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 | +133 days, USPTO patent term adjustment record | Feb 17, 2037 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,022,691, US 11,052,361) | capped to Oct 7, 2036 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | In force | High confidence |
| Further caveats on record | The record names parents not resolved: 15287852, 15287852 | Low confidence overall | Low confidence |
| Computed term end | The steps above, in order | Oct 7, 2036 | Low confidence |
This family
| US 10,022,691 | In force Oct 2036 | Oct 2036 |
| US 11,052,361 | In force Oct 2036 | Oct 2036 |
| US 11,634,643 | this patent Oct 2036 | Oct 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 |
|---|---|---|---|
| Aug 17, 2021 Reel 57200, frame 979 | Van Vliet, Bart; Heck, James A; Mangnus, Eduardus Maria; Jeurkar, Chitra; De Vries, Jelle; Mulder, Alart | Elementis Specialties, Inc. | 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.
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Alerts on its grants, lapses and transfers.
What's changing
Oct 2036
Term ends Oct 7, 2036. Maintenance fees still fall due before then
Note
The 133 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 10,022,691, US 11,052,361.
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2023 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.