Term ended no later than Feb 7, 2025 · Medium confidence
20-year base term ended Feb 7, 2025
Held by A123 Systems LLC
Filed Sep 13, 2010 as application 12/880,558 · Granted Dec 20, 2011
Base term, 20 years from filing
Today
Ended no later than Feb 7, 2025
2005
2026
Clock starts
Feb 7, 2005
Feb 7, 2005
Ended no later than
Feb 7, 2025
Feb 7, 2025
Granted
Dec 20, 2011
Dec 20, 2011
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.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. All three maintenance fees were paid, so no fee lapse ended it. Confidence: Medium. 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 Sep 13, 2010) | 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 | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium 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 | no later than Feb 7, 2025 | Medium confidence |
This family
| US 7,348,101 | Term ended Mar 2025 | Mar 2025 |
| US 7,261,979 | Term ended 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 | this patent 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 |
|---|---|---|---|
| Nov 18, 2011 Reel 27251, frame 860 | 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.
What's changing
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Feb 7, 2025. We will not guess the cap.
Citations
11
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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.