Also listed on Lxdata Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Dec 26, 2019 (Deutsche Bank Trust Company Americas).
Term ends Apr 1, 2029 · High confidence
20-year base term ends Aug 31, 2027
Held by Weatherford Canada Ltd.
Filed Feb 26, 2009 as application 12/438,979 · Granted Sep 3, 2019
Base term plus 579 days of patent term adjustment (USPTO delay)
Today
2007
2029
Clock starts
Aug 31, 2007
Aug 31, 2007
Term ends
Apr 1, 2029
Apr 1, 2029
Granted
Sep 3, 2019
Sep 3, 2019
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
579
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
2
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 579 days past its 20-year base term on prosecution delay. 1 of 2 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 Aug 31, 2007, when application PCT/CA2007/001545, the earliest non-provisional in its chain, was filed (this one was filed Feb 26, 2009) | Aug 31, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +579 days, USPTO patent term adjustment record | Apr 1, 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 | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 1, 2029 | High confidence |
This family
| US 10,400,579 | this patent Apr 2029 | Apr 2029 |
1 of 2 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 |
|---|---|---|---|
| Feb 26, 2009 Reel 22315, frame 12 | Vincelette, Andre; Lefebvre, Paul; Nadeau, Jean-francois | Lxdata Inc. | Assignment of Assignor's Interest |
| Feb 26, 2009 Reel 22315, frame 40 | Lxsix Photonics Inc. | Lxdata Inc. | Change of Name |
| Jan 13, 2014 Reel 31997, frame 290 | Lxdata Inc. | Weatherford Canada Partnership | Amalgamation-Dissolution-General Conveyance and Assuption Agreement |
| Jul 27, 2017 Reel 43111, frame 828 | Weatherford Canada Partnership | Weatherford Canada Ltd. | Assignment of Assignor's Interest |
| Dec 18, 2019 Reel 51891, frame 89 | Weatherford Technology Holdings LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity Inc.; Precision Energy Services Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Precision Energy Services ULC; Weatherford U.K. Limited | Wells Fargo Bank National Association as Agent | Security Interest |
| Dec 26, 2019 Reel 51419, frame 140 | Weatherford Technology Holdings, LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity, Inc.; Precision Energy Services, Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Precision Energy Services ULC; Weatherford U.K. Limited | Deutsche Bank Trust Company Americas, as Administrative Agent | Security Interest |
| Aug 28, 2020 Reel 54288, frame 302 | Weatherford Technology Holdings, LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity, Inc.; Precision Energy Services, Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Precision Energy Services ULC; Weatherford U.K. Limited | Wilmington Trust, National Association | Security Interest |
| Aug 28, 2020 Reel 53838, frame 323 | Wells Fargo Bank, National Association | Weatherford Technology Holdings, LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity, Inc.; Precision Energy Services, Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Precision Energy Services ULC; Weatherford U.K. Limited | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford Technology Holdings, LLC | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford Netherlands B.V. | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford Norge As | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | High Pressure Integrity, Inc. | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Precision Energy Services, Inc. | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford Canada Ltd. | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford Switzerland Trading and Development GmbH | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Precision Energy Services ULC | Release of Security Interest |
| Aug 28, 2020 reel/frame not recorded | Wells Fargo Bank, National Association | Weatherford U.K. Limited | Release of Security Interest |
| Oct 1, 2021 Reel 57683, frame 423 | Wilmington Trust, National Association | Weatherford Technology Holdings, LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity, Inc.; Precision Energy Services, Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Precision Energy Services ULC; Weatherford U.K. Limited | Release of Security Interest |
| Oct 1, 2021 Reel 57683, frame 706 | Weatherford Technology Holdings, LLC; Weatherford Netherlands B.V.; Weatherford Norge As; High Pressure Integrity, Inc.; Precision Energy Services, Inc.; Weatherford Canada Ltd.; Weatherford Switzerland Trading and Development GmbH; Weatherford U.K. Limited | Wilmington Trust, National Association | Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford Technology Holdings, LLC | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford Netherlands B.V. | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford Norge As | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | High Pressure Integrity, Inc. | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Precision Energy Services, Inc. | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford Canada Ltd. | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford Switzerland Trading and Development GmbH | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Precision Energy Services ULC | Release of Security Interest |
| Oct 1, 2021 reel/frame not recorded | Wilmington Trust, National Association | Weatherford U.K. Limited | Release of Security Interest |
| Apr 26, 2023 Reel 63470, frame 629 | Deutsche Bank Trust Company Americas | Wells Fargo Bank, National Association | Patent Security Interest Assignment Agreement |
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.
What's changing
Apr 2029
Term ends Apr 1, 2029. Maintenance fees still fall due before then
Note
The 579 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
22
later US patents cite this one
That is top 25% 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.