Term ends Mar 31, 2037 · High confidence
20-year base term ends Mar 31, 2037
Held by Fiberlean Technologies Limited
Filed Apr 2, 2021 as application 17/221,422 · Granted Dec 19, 2023
Base term plus 207 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2017
2037
Clock starts
Mar 31, 2017
Mar 31, 2017
Term ends
Mar 31, 2037
Mar 31, 2037
Granted
Dec 19, 2023
Dec 19, 2023
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
207
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 10,214,859, US 11,732,421.
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.
7
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 207 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 Mar 31, 2017, when application 15/475,487, the earliest non-provisional in its chain, was filed (this one was filed Apr 2, 2021) | Mar 31, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +207 days, USPTO patent term adjustment record | Oct 24, 2037 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,214,859, US 11,732,421) | capped to Mar 31, 2037 | 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 | Mar 31, 2037 | High confidence |
This family
| US 10,214,859 | In force Mar 2037 | Mar 2037 |
| US 10,801,162 | In force Mar 2037 | Mar 2037 |
| US 11,274,399 | Lapsed on the fee record Mar 2026 | Mar 2026 |
| US 11,846,072 | this patent Mar 2037 | Mar 2037 |
| US 11,732,421 | In force Mar 2037 | Mar 2037 |
| US 12,203,223 | In force Mar 2037 | Mar 2037 |
| Application 18/387,681 | Abandoned not computed | not computed |
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 |
|---|---|---|---|
| May 28, 2021 Reel 56380, frame 953 | Svending, Per; Phipps, Jonathan Stuart; Larson, Tom; Selina, Tania; Skuse, David | Fiberlean Technologies Limited | 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
Mar 2037
Term ends Mar 31, 2037. Maintenance fees still fall due before then
Note
The 207 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 10,214,859, US 11,732,421.
Citations
6
later US patents cite this one
That is top 25% 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.