Also listed on A123 Systems LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Oct 20, 2029 · High confidence
20-year base term ended Apr 3, 2026
Held by Lithium Werks Technology B.V.
Filed Feb 8, 2007 as application 11/672,931 · Granted Dec 4, 2012
Base term plus 1296 days of patent term adjustment (USPTO delay)
Today
2006
2029
Clock starts
Apr 3, 2006
Apr 3, 2006
Term ends
Oct 20, 2029
Oct 20, 2029
Granted
Dec 4, 2012
Dec 4, 2012
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
1,296
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.
41
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 1296 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 Apr 3, 2006, when application 11/396,515, the earliest non-provisional in its chain, was filed (this one was filed Feb 8, 2007) | Apr 3, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +1296 days, USPTO patent term adjustment record | Oct 20, 2029 | 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 | Oct 20, 2029 | High confidence |
This family
| Application 60/505,125 | Provisional application no patent term | no patent term |
| Application 60/559,171 | Provisional application no patent term | no patent term |
| US 7,986,124 | Lapsed on the fee record Jul 2015 | Jul 2015 |
| US 7,867,651 | In force Sep 2029 | Sep 2029 |
| US 7,723,958 | In force Mar 2027 | Mar 2027 |
| US 7,939,201 | In force May 2029 | May 2029 |
| Application PCT/US2006/030579 | PCT application no patent term | no patent term |
| US 7,927,732 | In force Dec 2029 | Dec 2029 |
8 of 41 applications in this family shown, earliest filings first. 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 27, 2007 Reel 19223, frame 106 | Chiang, Yet Ming; Gozdz, Antoni S.; Payne, Martin W. | A123 Systems, Inc. | Assignment of Assignor's Interest |
| May 17, 2007 Reel 19307, frame 234 | Chiang, Yet Ming; Gozdz, Antoni S.; Payne, Martin W. | 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 |
| Apr 26, 2022 Reel 59738, frame 439 | A123 Systems LLC | Lithium Werks Technology B.V. | Assignment of Assignor's Interest |
| Apr 26, 2022 Reel 59738, frame 464 | Lithium Werks Technology B.V. | Lithium Werks Asia II B.V. | Assignment of Assignor's Interest |
| Apr 26, 2022 Reel 59738, frame 500 | Lithium Werks Asia II B.V. | Ril USA, Inc. | Security Interest |
| Apr 26, 2022 Reel 59738, frame 536 | Ril USA, Inc. | Lithium Werks Asia II B.V. | Release of Security Interest |
| Apr 27, 2022 Reel 59741, frame 574 | Lithium Werks Asia II B.V. | Lithium Werks Technology B.V. | 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.
What's changing
Oct 2029
Term ends Oct 20, 2029. No further fees fall due before then
Note
The 1296 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
29
later US patents cite this one
That is top 25% of utility patents granted in 2012 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.