Term ends no later than Oct 20, 2031 · Medium confidence
20-year base term ends Jul 14, 2031
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by CertainTeed LLC
Filed Feb 16, 2021 as application 17/176,355 · Granted Apr 25, 2023
Base term plus 98 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Jul 14, 2011
Jul 14, 2011
Ends no later than
Oct 20, 2031
Oct 20, 2031
Granted
Apr 25, 2023
Apr 25, 2023
base term
patent term adjustment
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
98
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
1 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.
4
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 98 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 1 of 2 maintenance fees is paid so far. 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 Jul 14, 2011, when application PCT/GB2011/051328, the earliest non-provisional in its chain, was filed (this one was filed Feb 16, 2021) | Jul 14, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +98 days, USPTO patent term adjustment record | Oct 20, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Oct 20, 2031 | Medium confidence |
This family
| US 9,715,215 | In force May 2033 | May 2033 |
| US 10,928,776 | In force Mar 2033 | Mar 2033 |
| US 11,635,621 | this patent no later than Oct 2031 | no later than Oct 2031 |
3 of 4 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 |
|---|---|---|---|
| Feb 16, 2021 Reel 55270, frame 151 | Christmas, Jamieson; Masiyano, Dackson | Two Trees Photonics Limited | Assignment of Assignor's Interest |
| Feb 16, 2021 Reel 55270, frame 234 | Two Trees Photonics Limited | Dualitas Ltd. | Assignment of Assignor's Interest |
| Feb 6, 2023 Reel 62596, frame 212 | Wilson, Jonathan | CertainTeed Corporation | Nunc Pro Tunc Assignment |
| Feb 6, 2023 Reel 62650, frame 821 | CertainTeed Corporation | CertainTeed LLC | Conversion |
| Feb 6, 2023 Reel 62650, frame 887 | CertainTeed LLC | CertainTeed LLC | Conversion, Reverse Merger, Conversion |
| Apr 7, 2023 Reel 63336, frame 613 | Wilson, Jonathan | CertainTeed Corporation | Corrective Assignment to Correct the Remove Invorrectly Added Application Number Previously Recorded at Reel: 062596 Frame: 0212. Assignor(S) Hereby Confirms the Assignment. |
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
Oct 2031
Term ends no later than Oct 20, 2031. Maintenance fees still fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 98 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Oct 20, 2031. We will not guess the cap.
Citations
2
later US patents cite this one
That is above 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.