Also listed on Hitachi, Ltd., a Corp. of Japan, an earlier holder on the record. The recorded assignments below show how it moved.
Term ended Nov 1, 2026 · High confidence
20-year base term ended Nov 1, 2026
Held by Hitachi Energy Ltd.
Filed Apr 30, 2009 as application 12/433,580 · Granted May 25, 2010
Base term, 20 years from filing
Today
Term ended Nov 1, 2026
2006
2026
Clock starts
Nov 1, 2006
Nov 1, 2006
Term ended
Nov 1, 2026
Nov 1, 2026
Granted
May 25, 2010
May 25, 2010
base term
after the term ends
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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 7,672,812, to Nov 1, 2026. The term already ends on or before that date, so the cap shortened nothing.
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.
5
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. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. All three maintenance fees were paid, so no fee lapse ended it. 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 Nov 1, 2006, when application 11/555,429, the earliest non-provisional in its chain, was filed (this one was filed Apr 30, 2009) | Nov 1, 2026 | 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 | Disclaimer resolved from the filed document (refs US 7,672,812) | resolves to Nov 1, 2026, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Nov 1, 2026 | High confidence |
This family
| US 7,672,812 | In force Jun 2028 | Jun 2028 |
| US 7,558,703 | Term ended Nov 2026 | Nov 2026 |
| Application PCT/US2007/022543 | PCT application no patent term | no patent term |
| Application PCT/US2007/022551 | PCT application no patent term | no patent term |
| US 7,725,295 | this patent Nov 2026 | Nov 2026 |
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 |
|---|---|---|---|
| Aug 24, 2009 Reel 23136, frame 536 | Stoupis, James; Madwesh, Ajay C.; Lubkeman, David; Mousavi, Mirrasoul | ABB Research Ltd. | Assignment of Assignor's Interest |
| Dec 26, 2019 Reel 51419, frame 309 | ABB Research Ltd. | ABB Schweiz AG | Merger |
| 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 |
| 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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 7,672,812, ends no earlier than this term, so it caps nothing.
Citations
46
later US patents cite this one
That is top 25% 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.