Term ends Dec 21, 2037 · High confidence
20-year base term ends Dec 21, 2037
Held by Carbon Engineering ULC
Filed Apr 20, 2023 as application 18/137,313 · Granted Jul 1, 2025
Base term, 20 years from filing
Today
2017
2037
Clock starts
Dec 21, 2017
Dec 21, 2017
Term ends
Dec 21, 2037
Dec 21, 2037
Granted
Jul 1, 2025
Jul 1, 2025
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
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 11,655,421, to Dec 21, 2037. The term already ends on or before that date, so the cap shortened nothing.
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.
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 is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 Dec 21, 2017, when application PCT/CA2017/051581, the earliest non-provisional in its chain, was filed (this one was filed Apr 20, 2023) | Dec 21, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 11,655,421) | resolves to Dec 21, 2037, no earlier than this term, so no change | 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 | Dec 21, 2037 | High confidence |
This family
| US 11,655,421 | In force Mar 2040 | Mar 2040 |
| US 12,344,803 | this patent Dec 2037 | Dec 2037 |
| Application 19/250,527 | Pending not computed | not computed |
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 |
|---|---|---|---|
| Jul 20, 2023 Reel 64324, frame 977 | Carbon Engineering Limited Partnership | Carbon Engineering Ltd. | Assignment of Assignor's Interest |
| Jul 20, 2023 Reel 64351, frame 551 | Heidel, Kenton; Murphy, James; Corless, Adrian; Holmes, Geoff; McCahill, Jenny; Stukas, Anna; Ritchie, Jane; Nold, Kevin | Carbon Engineering Limited Partnership | Assignment of Assignor's Interest |
| Feb 28, 2024 Reel 66593, frame 551 | Carbon Engineering Ltd. | Carbon Engineering ULC | 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
Dec 2037
Term ends Dec 21, 2037. Maintenance fees still fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 11,655,421, ends no earlier than this term, so it caps nothing.
Citations
0
later US patents cite this one
Fewer than half of the utility patents granted in 2025 in our data have been cited yet, so we show the count and do not rank on it.
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.