Also listed on Schlumberger Technology B.V., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends May 27, 2035 · High confidence
20-year base term ends Oct 28, 2034
Held by Schlumberger Technology Corporation, Schlumberger Canada Limited, Services Petroliers Schlumberger, Schlumberger Holdings Limited, Prad Research and Development Limited and Schlumberger Technology B.V.
Filed Apr 26, 2016 as application 15/032,241 · Granted May 21, 2019
Base term plus 211 days of patent term adjustment (USPTO delay)
Today
2014
2035
Clock starts
Oct 28, 2014
Oct 28, 2014
Term ends
May 27, 2035
May 27, 2035
Granted
May 21, 2019
May 21, 2019
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
211
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 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.
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 211 days past its 20-year base term on 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 Oct 28, 2014, when application PCT/US2014/062621, the earliest non-provisional in its chain, was filed (this one was filed Apr 26, 2016) | Oct 28, 2034 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +211 days, USPTO patent term adjustment record | May 27, 2035 | 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 27, 2035 | High confidence |
This family
| Application PCT/US2014/062621 | PCT application no patent term | no patent term |
| US 10,295,636 | this patent May 2035 | May 2035 |
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 |
|---|---|---|---|
| Apr 26, 2016 Reel 38386, frame 642 | Song, Yi-qiao; Paulsen, Jeffrey; Ham, Donhee; Ha, Dongwan | Schlumberger Technology Corporation; President and Fellows of Harvard College | Assignment of Assignor's Interest |
| Apr 26, 2016 reel/frame not recorded | Ham, Donhee; Ha, Dongwan; Paulsen, Jeffrey; Song, Yi-qiao | Schlumberger Technology Corporation | Assignment of Assignor's Interest |
| Apr 26, 2016 reel/frame not recorded | Ham, Donhee; Ha, Dongwan; Paulsen, Jeffrey; Song, Yi-qiao | President and Fellows of Harvard College | Assignment of Assignor's Interest |
| Jun 19, 2017 Reel 42888, frame 854 | Song, Yi-qiao; Paulsen, Jeffrey; Ham, Donhee; Ha, Dongwan | Schlumberger Technology Corporation | Corrective Assignment to Correct the First and Second Assignor Execution Dates Previously Recorded on Reel 038386 Frame 0642. Assignor(S) Hereby Confirms the Assignment of Assignors Interest. |
| Jun 27, 2017 Reel 42825, frame 901 | Ha, Dongwan; Ham, Donhee | President and Fellows of Harvard College | Assignment of Assignor's Interest |
| Jul 6, 2017 Reel 43099, frame 205 | Song, Yi-qiao; Paulsen, Jeffrey | Schlumberger Technology Corporation | Corrective Assignment to Correct the Number of Assignors Listed Previously Recorded at Reel: 042888 Frame: 0854. Assignor(S) Hereby Confirms the Assignment. |
| Mar 21, 2019 Reel 48663, frame 488 | Song, Yi-qiao; Paulsen, Jeffrey | Schlumberger Technology Corporation; Schlumberger Canada Limited; Services Petroliers Schlumberger; Schlumberger Holdings Limited; Prad Research and Development Limited; Schlumberger Technology B.V. | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Schlumberger Technology Corporation | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Schlumberger Canada Limited | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Services Petroliers Schlumberger | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Schlumberger Holdings Limited | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Prad Research and Development Limited | Assignment of Assignor's Interest |
| Mar 21, 2019 reel/frame not recorded | Paulsen, Jeffrey; Song, Yi-qiao | Schlumberger Technology B.V. | Assignment of Assignor's Interest |
| Apr 24, 2019 Reel 48991, frame 140 | Harvard University | National Science Foundation | Confirmatory License |
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 27, 2035. Maintenance fees still fall due before then
Note
The 211 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
10
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.