Term ended Feb 7, 2025 · High confidence
20-year base term ended Feb 7, 2025
Held by A123 Systems LLC
Filed Mar 9, 2005 as application 11/076,556 · Granted Aug 28, 2007
Base term, 20 years from filing
Today
Term ended Feb 7, 2025
2005
2026
Clock starts
Feb 7, 2005
Feb 7, 2005
Term ended
Feb 7, 2025
Feb 7, 2025
Granted
Aug 28, 2007
Aug 28, 2007
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.
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.
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 is its 20-year base term, with no adjustment for prosecution delay. 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 Feb 7, 2005, when application 11/052,971, the earliest non-provisional in its chain, was filed (this one was filed Mar 9, 2005) | Feb 7, 2025 | 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 | 3 of 3 maintenance fees paid | term ended | High confidence |
| Computed term end | The steps above, in order | Feb 7, 2025 | High confidence |
This family
| US 7,348,101 | Term ended Mar 2025 | Mar 2025 |
| US 7,261,979 | this patent Feb 2025 | Feb 2025 |
| US 8,617,745 | In force Jun 2029 | Jun 2029 |
| US 7,799,461 | Term ended no later than Feb 2025 | no later than Feb 2025 |
| US 8,080,338 | Term ended no later than Feb 2025 | no later than Feb 2025 |
| US 9,608,292 | Term ended Jan 2026 | Jan 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 |
|---|---|---|---|
| Apr 5, 2006 Reel 17426, frame 836 | Gozdz, Antoni S.; Chu, Andrew C.; Chiang, Yet-ming; Riley, Gilbert N., JR. | A123 Systems, Inc. | Assignment of Assignor's Interest |
| Aug 17, 2012 Reel 28801, frame 112 | A123 Systems, Inc. | Wanxiang America Corporation | Security Agreement |
| Jun 17, 2013 Reel 30628, frame 494 | Wanxiang America Corporation | A123 Systems, Inc. | Bankruptcy Order Authorizing the Sale of Assets Free and Clear of All Claims, Liens, Liabilities, Rights, Interests and Encumbrances (Releases Wanxiang Security Interest) |
| Jun 18, 2013 Reel 30639, frame 213 | A123 Systems, Inc. | Wanxiang Clean Energy USA Acquisition LLC | Assignment of Assignor's Interest |
| Jun 18, 2013 Reel 30639, frame 244 | Wanxiang Clean Energy USA Acquisition LLC | A123 Systems LLC | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
Citations
60
later US patents cite this one
That is top 25% of utility patents granted in 2007 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.