Term ends Sep 1, 2036 · High confidence
20-year base term ends Oct 22, 2035
Held by Hitachi Energy Ltd.
Filed Mar 10, 2017 as application 15/456,431 · Granted Jan 28, 2020
Base term plus 315 days of patent term adjustment (USPTO delay)
Today
2015
2036
Clock starts
Oct 22, 2015
Oct 22, 2015
Term ends
Sep 1, 2036
Sep 1, 2036
Granted
Jan 28, 2020
Jan 28, 2020
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
315
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.
6
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 315 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 22, 2015, when application 14/919,956, the earliest non-provisional in its chain, was filed (this one was filed Mar 10, 2017) | Oct 22, 2035 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +315 days, USPTO patent term adjustment record | Sep 1, 2036 | 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 | Sep 1, 2036 | High confidence |
This family
| Application 62/068,495 | Provisional application no patent term | no patent term |
| US 10,431,375 | In force Aug 2038 | Aug 2038 |
| US 10,543,511 | this patent Sep 2036 | Sep 2036 |
| US 10,832,859 | In force Oct 2035 | Oct 2035 |
| US 10,679,787 | In force Oct 2035 | Oct 2035 |
| US 11,914,057 | In force Oct 2035 | Oct 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 |
|---|---|---|---|
| Dec 10, 2019 Reel 51232, frame 43 | Frimpong, George K.; Prieto Colmenero, Alberto | ABB Schweiz AG | Assignment of Assignor's Interest |
| Dec 10, 2019 Reel 51241, frame 315 | ABB Schweiz AG | ABB Power Grids Switzerland AG | Assignment of Assignor's Interest |
| Mar 6, 2020 Reel 52916, frame 1 | ABB Schweiz AG | ABB Power Grids Switzerland AG | Assignment of Assignor's Interest |
| Dec 31, 2021 Reel 58666, frame 540 | ABB Power Grids Switzerland AG | Hitachi Energy Switzerland AG | Change of Name |
| May 26, 2022 Reel 60026, frame 741 | Pitois, Claire | Hitachi Energy Switzerland AG | Assignment of Assignor's Interest |
| Nov 13, 2023 Reel 65549, frame 576 | Hitachi Energy Switzerland AG | Hitachi Energy Ltd. | 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
Sep 2036
Term ends Sep 1, 2036. Maintenance fees still fall due before then
Note
The 315 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is top 25% of utility patents granted in 2020 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.