Also listed on Tropos Networks, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Nov 18, 2026 · High confidence
20-year base term ended Aug 16, 2026
Held by Hitachi Energy Ltd.
Filed Aug 16, 2006 as application 11/505,143 · Granted Nov 8, 2011
Base term plus 94 days of patent term adjustment (USPTO delay)
Today
2006
2026
Clock starts
Aug 16, 2006
Aug 16, 2006
Term ends
Nov 18, 2026
Nov 18, 2026
Granted
Nov 8, 2011
Nov 8, 2011
base term
patent term adjustment
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
94
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
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 94 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Aug 16, 2006, when this application, 11/505,143, was filed | Aug 16, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +94 days, USPTO patent term adjustment record | Nov 18, 2026 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Nov 18, 2026 | High confidence |
This family
| US 8,054,784 | this patent Nov 2026 | Nov 2026 |
| Application PCT/US2007/017855 | PCT application no patent term | no patent term |
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 16, 2006 Reel 18186, frame 197 | Ren, Wenge; Srikrishna, Devabhaktuni; Behroozi, Cyrus | Tropos Networks, Inc. | Assignment of Assignor's Interest |
| Nov 30, 2009 Reel 23574, frame 659 | Tropos Networks, Inc. | Silicon Valley Bank | Security Agreement |
| Jul 9, 2012 Reel 28755, frame 797 | Silicon Valley Bank | Tropos Networks, Inc. | Release |
| Dec 8, 2020 Reel 54644, frame 511 | Tropos Networks Inc. | ABB Technology Ltd. | Assignment of Assignor's Interest |
| Dec 9, 2020 Reel 54893, frame 273 | ABB Technology AG | ABB Schweiz AG | Merger |
| Mar 15, 2021 Reel 55589, frame 769 | ABB Schweiz AG | ABB Power Grids Switzerland AG | Assignment of Assignor's Interest |
| Aug 3, 2021 Reel 57685, frame 44 | ABB Technology Ltd. | ABB Technology AG | Merger |
| 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.
What's changing
Nov 2026
Term ends Nov 18, 2026. No further fees fall due before then
Note
The 94 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
15
later US patents cite this one
That is above the median of utility patents granted in 2011 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.