Term ended Jun 25, 2024 · High confidence
20-year base term ended Jun 25, 2024
USPTO later recorded it as expired for non-payment on Oct 12, 2026.
Held by Hydro-Quebec
Filed Sep 23, 2011 as application 13/243,448 · Granted Sep 9, 2014
Base term, 20 years from filing
Today
Term ended Jun 25, 2024
2004
2026
Clock starts
Jun 25, 2004
Jun 25, 2004
Term ended
Jun 25, 2024
Jun 25, 2024
Granted
Sep 9, 2014
Sep 9, 2014
base term
after the term ends
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
2 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 is its 20-year base term, with no adjustment for prosecution delay. 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 Jun 25, 2004, when application PCT/CA2004/000956, the earliest non-provisional in its chain, was filed (this one was filed Sep 23, 2011) | Jun 25, 2024 | 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 | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | term ended | High confidence |
| USPTO status record | Recorded as expired for non-payment on Oct 12, 2026, after the term ended | no change | High confidence |
| Computed term end | The steps above, in order | Jun 25, 2024 | High confidence |
This family
| US 8,048,561 | In force Dec 2026 | Dec 2026 |
| US 8,828,103 | this patent Jun 2024 | Jun 2024 |
| US 9,768,441 | Term ended Jun 2024 | Jun 2024 |
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 |
|---|---|---|---|
| Sep 23, 2011 Reel 26961, frame 942 | Zaghib, Karim; Guerfi, Abdelbast; Charest, Patrick; Kostecki, Robert; Kinoshita, Kimio; Armand, Michel | Hydro-Quebec | 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.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2014 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.