Also listed on TK Holdings Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Mar 25, 2035 · High confidence
20-year base term ends Mar 25, 2035
Filed Sep 26, 2016 as application 15/129,071 · Granted Aug 6, 2019
USPTO first gave this application the number US 10,280,040 and withdrew it before it issued. That number now leads here.
Base term, 20 years from filing
Today
2015
2035
Clock starts
Mar 25, 2015
Mar 25, 2015
Term ends
Mar 25, 2035
Mar 25, 2035
Granted
Aug 6, 2019
Aug 6, 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.
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 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 Mar 25, 2015, when application PCT/EP2015/056451, the earliest non-provisional in its chain, was filed (this one was filed Sep 26, 2016) | Mar 25, 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 | Mar 25, 2035 | High confidence |
This family
| US 10,370,221 | this patent Mar 2035 | Mar 2035 |
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 |
|---|---|---|---|
| Nov 28, 2016 Reel 40423, frame 381 | Steinhauer, Eduard | Thyssenkrupp Elevator AG | Assignment of Assignor's Interest |
| Jun 15, 2020 Reel 52945, frame 233 | Thyssenkrupp Elevator AG | Thyssenkrupp Elevator Innovation and Operations AG | Change of Name |
| Jun 16, 2020 Reel 52963, frame 497 | Thyssenkrupp Elevator Innovation and Operations AG | Thyssenkrupp Elevator Innovation and Operations GmbH | Change of Name |
| Jun 3, 2025 Reel 71478, frame 339 | Thyssenkrupp Elevator Innovation and Operations GmbH | TK Elevator Innovation and Operations GmbH | Change of Name |
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.
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Alerts on its grants, lapses and transfers.
What's changing
Mar 2035
Term ends Mar 25, 2035. Maintenance fees still fall due before then
Citations
18
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.