Term ends no later than Jan 8, 2039 · Medium confidence
20-year base term ends Jan 8, 2039
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Terawatt Technology Inc.
Filed Jan 8, 2019 as application 16/243,032 · Granted Oct 4, 2022
Base term, 20 years from filing
Today
2019
2039
Clock starts
Jan 8, 2019
Jan 8, 2019
Ends no later than
Jan 8, 2039
Jan 8, 2039
Granted
Oct 4, 2022
Oct 4, 2022
base term
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
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.
1 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.
3
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. 1 of 3 maintenance fees is paid so far. 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 Jan 8, 2019, when this application, 16/243,032, was filed | Jan 8, 2039 | 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 | 1 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Jan 8, 2039 | Medium confidence |
This family
| US 11,462,804 | this patent no later than Jan 2039 | no later than Jan 2039 |
| Application 16/243,041 | Pending not computed | not computed |
| Application PCT/US2020/012657 | 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 |
|---|---|---|---|
| Jan 8, 2019 Reel 47936, frame 443 | Imoto, Hiroshi; Ogata, Ken; Arai, Juichi; Yang, Yang | Chongqing Jinkang New Energy Automobile Co., Ltd.; SF Motors Inc. | Assignment of Assignor's Interest |
| Jan 8, 2019 reel/frame not recorded | Arai, Juichi; Imoto, Hiroshi; Ogata, Ken; Yang, Yang | Chongqing Jinkang New Energy Automobile Co., Ltd. | Assignment of Assignor's Interest |
| Jan 8, 2019 reel/frame not recorded | Arai, Juichi; Imoto, Hiroshi; Ogata, Ken; Yang, Yang | SF Motors Inc. | Assignment of Assignor's Interest |
| Jun 3, 2020 Reel 52823, frame 463 | Chongqing Jinkang New Energy Automobile Co., Ltd. | SF Motors, Inc. | Assignment of Assignor's Interest |
| Jun 3, 2020 Reel 52827, frame 684 | SF Motors, Inc. | Terawatt Technology Inc. | 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
Jan 2039
Term ends no later than Jan 8, 2039. Maintenance fees still fall due before then
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 Jan 8, 2039. We will not guess the cap.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2022 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.
In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.