Term ends Apr 14, 2042 · High confidence
20-year base term ends Apr 5, 2041
Held by Notark Corporation
Filed Apr 5, 2021 as application 17/301,488 · Granted Aug 22, 2023
Base term plus 374 days of patent term adjustment (USPTO delay)
Today
2021
2042
Clock starts
Apr 5, 2021
Apr 5, 2021
Term ends
Apr 14, 2042
Apr 14, 2042
Granted
Aug 22, 2023
Aug 22, 2023
base term
patent term adjustment
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
374
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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.
This patent's term runs 374 days past its 20-year base term on 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 Apr 5, 2021, when this application, 17/301,488, was filed | Apr 5, 2041 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +374 days, USPTO patent term adjustment record | Apr 14, 2042 | 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 | Apr 14, 2042 | High confidence |
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 |
|---|---|---|---|
| Oct 29, 2021 Reel 57956, frame 737 | Ding, Ruidong; Tian, Jason; Van Erp, Hannes Hendrik Peter; Reiter, Chad | Kraton Polymers LLC | Assignment of Assignor's Interest |
| Mar 18, 2022 Reel 59864, frame 455 | Kraton Chemical, LLC; Kraton Polymers LLC; Kraton Polymers U.S. LLC | Goldman Sachs Bank USA, as Collateral Agent | Security Interest |
| Nov 17, 2023 Reel 65617, frame 157 | Kraton Polymers LLC | Kraton Corporation | Change of Name |
| Nov 26, 2023 Reel 65660, frame 747 | Kraton Corporation | Notark LLC | Assignment of Assignor's Interest |
| Jun 4, 2024 Reel 67608, frame 978 | Notark LLC | Notark Corporation | Certificate of Conversion |
| Jul 24, 2024 Reel 68671, frame 836 | Goldman Sachs Bank USA, as Collateral Agent | Kraton Chemical, LLC; Kraton Corporation | Release of Security Interest in Patents |
| Jul 24, 2024 reel/frame not recorded | Goldman Sachs Bank USA, as Collateral Agent | Kraton Chemical, LLC | Release of Security Interest in Patents |
| Jul 24, 2024 reel/frame not recorded | Goldman Sachs Bank USA, as Collateral Agent | Kraton Corporation | 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
Apr 2042
Term ends Apr 14, 2042. Maintenance fees still fall due before then
Note
The 374 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
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.