Collateral for a security interest recorded Dec 17, 2020 (The Toronto-Dominion Bank).
Term ended Oct 6, 2026 · High confidence
20-year base term ended Oct 6, 2026
Held by Shawcor Ltd.
Filed Dec 11, 2009 as application 12/636,500 · Granted Oct 25, 2011
Base term, 20 years from filing
Today
Term ended Oct 6, 2026
2006
2026
Clock starts
Oct 6, 2006
Oct 6, 2006
Term ended
Oct 6, 2026
Oct 6, 2026
Granted
Oct 25, 2011
Oct 25, 2011
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.
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.
10
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 were paid, so no fee lapse ended it. 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 Oct 6, 2006, when application 11/539,575, the earliest non-provisional in its chain, was filed (this one was filed Dec 11, 2009) | Oct 6, 2026 | 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 | term ended | High confidence |
| Computed term end | The steps above, in order | Oct 6, 2026 | High confidence |
This family
| US 6,889,716 | Term ended Jan 2023 | Jan 2023 |
| Application 11/108,776 | Abandoned not computed | not computed |
| US 7,946,629 | In force Mar 2029 | Mar 2029 |
| US 8,042,252 | this patent Oct 2026 | Oct 2026 |
| US 9,243,727 | In force Mar 2033 | Mar 2033 |
| US 9,726,306 | In force Oct 2034 | Oct 2034 |
| US 9,322,495 | In force Nov 2033 | Nov 2033 |
| US 10,226,823 | In force May 2035 | May 2035 |
8 of 10 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 |
|---|---|---|---|
| Dec 14, 2009 Reel 23650, frame 482 | Conley, Jeffrey Ryan; Bouey, Samuel Glen | Flexpipe Systems Inc. | Assignment of Assignor's Interest |
| Nov 4, 2020 Reel 54305, frame 742 | Flexpipe Systems Inc. | Shawcor Ltd. | Merger |
| Dec 17, 2020 Reel 54678, frame 72 | Shawcor, Ltd. | The Toronto-Dominion Bank | 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.
Citations
7
later US patents cite this one
That is below the median of utility patents granted in 2011 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.