Term ends Aug 20, 2033 · High confidence
20-year base term ends Oct 15, 2032
Held by Schlumberger Technology B.V.
Filed Oct 15, 2012 as application 13/652,274 · Granted Jul 14, 2015
Base term plus 309 days of patent term adjustment (USPTO delay)
Today
2012
2033
Clock starts
Oct 15, 2012
Oct 15, 2012
Term ends
Aug 20, 2033
Aug 20, 2033
Granted
Jul 14, 2015
Jul 14, 2015
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
309
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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 309 days past its 20-year base term on prosecution delay. 2 of 3 maintenance fees are 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 15, 2012, when this application, 13/652,274, was filed | Oct 15, 2032 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +309 days, USPTO patent term adjustment record | Aug 20, 2033 | 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 | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Aug 20, 2033 | 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 |
|---|---|---|---|
| Oct 15, 2012 Reel 29131, frame 796 | Wetzel, James Rudolph; Sheline, Evan; Griffiths, Neil | Zeitecs B.V. | Assignment of Assignor's Interest |
| Apr 25, 2018 Reel 45630, frame 310 | Zeitecs B.V. | Schlumberger Technology B.V. | 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
Aug 2033
Term ends Aug 20, 2033. Maintenance fees still fall due before then
Note
The 309 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
57
later US patents cite this one
That is top 10% of utility patents granted in 2015 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.