Collateral for a security interest recorded Dec 17, 2020 (The Toronto-Dominion Bank).

Term ended Jan 27, 2023 · High confidence

Computed 20-year base term

Held by Shawcor Ltd.

Filed Jan 27, 2003 as application 10/351,350 · Granted May 10, 2005

Base term, 20 years from filing

Today

20 years from filing

Term ended Jan 27, 2023

2003 2026

Clock starts
Jan 27, 2003

Term ended
Jan 27, 2023

Granted
May 10, 2005

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.

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 Jan 27, 2003, when this application, 10/351,350, was filed	Jan 27, 2023	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	Jan 27, 2023	High confidence

This family

US 6,889,716	this patent 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	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 27, 2003 Reel 13708, frame 164	Lundberg, Chris A.; McLeod, David W.; 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

later US patents cite this one

That is top 25% of utility patents granted in 2005 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.

Fiber Reinforced Pipe