Collateral for a security interest recorded Feb 27, 2018 (National Bank of Canada).
Term ends May 26, 2031 · High confidence
20-year base term ends May 26, 2031
Held by Exfo Inc.
Filed Nov 26, 2012 as application 13/699,982 · Granted Nov 5, 2013
Base term, 20 years from filing
Today
2011
2031
Clock starts
May 26, 2011
May 26, 2011
Term ends
May 26, 2031
May 26, 2031
Granted
Nov 5, 2013
Nov 5, 2013
base term
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.
3 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.
5
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. All three maintenance fees are recorded paid; no more fees are due. 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 May 26, 2011, when application PCT/CA2011/000625, the earliest non-provisional in its chain, was filed (this one was filed Nov 26, 2012) | May 26, 2031 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 26, 2031 | High confidence |
This family
| US 8,576,389 | this patent May 2031 | May 2031 |
| US 9,170,173 | In force May 2031 | May 2031 |
| US 9,571,186 | In force May 2031 | May 2031 |
| US 10,014,935 | In force May 2031 | May 2031 |
4 of 5 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 |
|---|---|---|---|
| Nov 26, 2012 Reel 29349, frame 46 | Perron, Stephane; Leblanc, Michel | Exfo Inc. | Assignment of Assignor's Interest |
| Feb 27, 2018 Reel 45470, frame 202 | Exfo Inc. | National Bank of Canada | Security Interest |
| Aug 8, 2025 Reel 72338, frame 500 | Exfo Inc. (a Corporation Resulting from the Amalgamation of 11172239 Canada Inc. and Exfo Inc.); Ontology-Partners Limited | National Bank of Canada | Security 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
May 2031
Term ends May 26, 2031. No further fees fall due before then
Citations
33
later US patents cite this one
That is top 25% of utility patents granted in 2013 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.