Term ends Jul 26, 2031 · High confidence
20-year base term ends Dec 1, 2029
Held by A123 Systems LLC
Filed Dec 1, 2009 as application 12/628,733 · Granted Apr 7, 2015
Base term plus 602 days of patent term adjustment (USPTO delay)
Today
2009
2031
Clock starts
Dec 1, 2009
Dec 1, 2009
Term ends
Jul 26, 2031
Jul 26, 2031
Granted
Apr 7, 2015
Apr 7, 2015
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
602
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.
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 runs 602 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 Dec 1, 2009, when this application, 12/628,733, was filed | Dec 1, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +602 days, USPTO patent term adjustment record | Jul 26, 2031 | 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 | Jul 26, 2031 | High confidence |
This family
| US 8,999,546 | this patent Jul 2031 | Jul 2031 |
| US 8,257,855 | In force Sep 2030 | Sep 2030 |
| US 8,815,429 | In force Aug 2031 | Aug 2031 |
| Application PCT/US2010/020633 | PCT application no patent term | no patent term |
| US 8,409,744 | In force Dec 2029 | Dec 2029 |
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 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 |
| Jun 16, 2017 Reel 42733, frame 817 | Hostler, Jonathan E.; Ijaz, Mujeeb; Butt, Shazad M. | A123 Systems, LLC | Assignment of Assignor's Interest |
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
Jul 2031
Term ends Jul 26, 2031. No further fees fall due before then
Note
The 602 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
32
later US patents cite this one
That is top 25% of utility patents granted in 2015 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.