Also listed on Prad Research and Development Limited, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jan 26, 2029 · High confidence
20-year base term ends Dec 27, 2027
Held by Schlumberger Technology Corporation, Schlumberger Canada Limited, Services Petroliers Schlumberger, Schlumberger Holdings Limited, Schlumberger Technology B.V. and Prad Research and Development Limited
Filed Dec 27, 2007 as application 11/965,150 · Granted Nov 9, 2010
Base term plus 396 days of patent term adjustment (USPTO delay)
Today
2007
2029
Clock starts
Dec 27, 2007
Dec 27, 2007
Term ends
Jan 26, 2029
Jan 26, 2029
Granted
Nov 9, 2010
Nov 9, 2010
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
396
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.
This patent's term runs 396 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 Dec 27, 2007, when this application, 11/965,150, was filed | Dec 27, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +396 days, USPTO patent term adjustment record | Jan 26, 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 | Jan 26, 2029 | High confidence |
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 5, 2008 Reel 20469, frame 849 | Suarez, Yoscel; Le Calvez, Joel | Schlumberger Technology Corporation; Schlumberger Canada Limited; Services Petroliers Schlumberger; Schlumberger Holdings Limited; Schlumberger Technology B.V.; Prad Research and Development Limited | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Schlumberger Technology Corporation | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Schlumberger Canada Limited | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Services Petroliers Schlumberger | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Schlumberger Holdings Limited | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Schlumberger Technology B.V. | Assignment of Assignor's Interest |
| Feb 5, 2008 reel/frame not recorded | Suarez, Yoscel; Le Calvez, Joel | Prad Research and Development Limited | Assignment of Assignor's Interest |
| Apr 3, 2008 Reel 20749, frame 768 | Suarez, Yoscal; Le Calvez, Joel | Schlumberger Technology Corporation | Corrective Assignment to Remove Asignees 2,3,4 and 5, Previously Recorded on Reel 020469 Frame 0849. Assignor(S) Hereby Confirms the Assignment. |
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
Jan 2029
Term ends Jan 26, 2029. No further fees fall due before then
Note
The 396 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
12
later US patents cite this one
That is above the median of utility patents granted in 2010 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.