Lapsed Nov 2, 2025 on the fee record · Medium confidence
20-year base term ends May 17, 2030
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 8,231,764), so the cap could be lower.
First maintenance fee unpaid; grace period ended.
Held by Fiberlean Technologies Limited
Filed Aug 30, 2018 as application 16/117,582 · Granted Nov 2, 2021
Base term, 20 years from filing, plus 44 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
Lapsed Nov 2, 2025
2010
2030
Clock starts
May 17, 2010
May 17, 2010
No longer in force
Nov 2, 2025
Nov 2, 2025
Granted
Nov 2, 2021
Nov 2, 2021
Term would have run to
May 17, 2030
May 17, 2030
base term
after the term ends
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
44
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 8,231,764.
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.
9
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to May 17, 2030: its 20-year base term plus 44 days of term adjustment for prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. Confidence: Medium. 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 May 17, 2010, when application PCT/GB2010/000982, the earliest non-provisional in its chain, was filed (this one was filed Aug 30, 2018) | May 17, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +44 days, USPTO patent term adjustment record | Jun 30, 2030 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,231,764) | capped to May 17, 2030 | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 2 maintenance fees paid | lapsed Nov 2, 2025 | High confidence |
| Computed term end | The steps above, in order | Nov 2, 2025 | Medium confidence |
This family
| US 9,127,405 | In force Nov 2030 | Nov 2030 |
| US 8,231,764 | In force no later than May 2030 | no later than May 2030 |
| US 10,100,464 | Lapsed on the fee record Oct 2026 | Oct 2026 |
| US 11,377,791 | Lapsed on the fee record Jul 2026 | Jul 2026 |
| US 11,162,219 | this patent Nov 2025 | Nov 2025 |
| US 11,732,411 | In force May 2030 | May 2030 |
| US 11,970,817 | In force no later than May 2030 | no later than May 2030 |
| Application 18/619,339 | Abandoned not computed | not computed |
8 of 9 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| Jun 14, 2019 Reel 49467, frame 241 | Husband, John Claude; Svending, Per; Skuse, David Robert; Motsi, Tafadzwa | Fiberlean Technologies Limited | Assignment of Assignor's Interest |
| Jun 14, 2019 Reel 49467, frame 271 | Imerys Minerals Limited | Fiberleantm Technologies Limited | Assignment of Assignor's Interest |
| Jun 14, 2019 Reel 49476, frame 96 | Fiberleantm Technologies Limited | Fiberlean Technologies Limited | Change of Name |
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
Note
The 44 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 8,231,764.
Citations
3
later US patents cite this one
That is above the median of utility patents granted in 2021 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.