Collateral for a security interest recorded Dec 17, 2020 (The Toronto-Dominion Bank).
Term ends Mar 16, 2029 · High confidence
20-year base term ended Oct 6, 2026
Held by Shawcor Ltd.
Filed Oct 6, 2006 as application 11/539,575 · Granted May 24, 2011
Base term plus 892 days of patent term adjustment (USPTO delay)
Today
2006
2029
Clock starts
Oct 6, 2006
Oct 6, 2006
Term ends
Mar 16, 2029
Mar 16, 2029
Granted
May 24, 2011
May 24, 2011
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
892
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
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 runs 892 days past its 20-year base term on 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 Oct 6, 2006, when this application, 11/539,575, was filed | Oct 6, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +892 days, USPTO patent term adjustment record | Mar 16, 2029 | 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 | Mar 16, 2029 | 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 | this patent Mar 2029 | Mar 2029 |
| US 8,042,252 | Term ended 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 |
|---|---|---|---|
| Jan 19, 2007 Reel 18781, frame 586 | 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.
What's changing
Mar 2029
Term ends Mar 16, 2029. No further fees fall due before then
Note
The 892 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
15
later US patents cite this one
That is above 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.