Also listed on Shawcor Ltd., an earlier holder on the record. The recorded assignments below show how it moved.

Term ends May 29, 2035 · High confidence

Computed 20-year base term

Held by Shawcor Ltd. Shawcor Ltée

Filed May 29, 2015 as application 14/725,645 · Granted Mar 12, 2019

Base term, 20 years from filing

Today

20 years from filing

Term ends May 29, 2035

2015 2035

Clock starts
May 29, 2015

Term ends
May 29, 2035

Granted
Mar 12, 2019

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.

1 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. 1 of 3 maintenance fees is paid so far. 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 29, 2015, when this application, 14/725,645, was filed	May 29, 2035	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	1 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	May 29, 2035	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	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	this patent 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
Jun 8, 2015 Reel 35802, frame 804	Karpachevskyy, Taras	Flexpipe Systems Inc.	Assignment of Assignor's Interest
Jan 23, 2019 Reel 48117, frame 779	Flexpipe Systems Inc.	Shawcor Ltd. Shawcor Ltée	Merger

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 2035

Term ends May 29, 2035.

Citations

later US patents cite this one

That is top 10% of utility patents granted in 2019 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.

Portable Pipe Lathe and Method