Term ends Apr 16, 2039 · High confidence
20-year base term ends Dec 4, 2038
Held by Terawatt Technology Inc.
Filed Dec 4, 2018 as application 16/209,828 · Granted Jun 1, 2021
Base term plus 133 days of patent term adjustment (USPTO delay)
Today
2018
2039
Clock starts
Dec 4, 2018
Dec 4, 2018
Term ends
Apr 16, 2039
Apr 16, 2039
Granted
Jun 1, 2021
Jun 1, 2021
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
133
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
2
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 133 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is paid so far. 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 4, 2018, when this application, 16/209,828, was filed | Dec 4, 2038 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +133 days, USPTO patent term adjustment record | Apr 16, 2039 | 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 | 1 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 16, 2039 | High confidence |
This family
| US 11,024,877 | this patent Apr 2039 | Apr 2039 |
| US 11,848,413 | In force Jun 2039 | Jun 2039 |
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 30, 2019 Reel 48182, frame 747 | Ogata, Ken; Imoto, Hiroshi | SF Motors, Inc. | Assignment of Assignor's Interest |
| Mar 9, 2019 Reel 48553, frame 755 | SF Motors, Inc. | Chongqing Jinkang New Energy Vehicle Co., Ltd.; SF Motors, Inc. | Assignment of Assignor's Interest |
| Mar 9, 2019 reel/frame not recorded | SF Motors, Inc. | Chongqing Jinkang New Energy Vehicle Co., Ltd. | Assignment of Assignor's Interest |
| Mar 9, 2019 reel/frame not recorded | SF Motors, Inc. | SF Motors, Inc. | Assignment of Assignor's Interest |
| Jan 31, 2020 Reel 51683, frame 451 | SF Motors, Inc. | Terawatt Technology Inc. | Assignment of Assignor's Interest |
| Jan 12, 2021 Reel 54888, frame 609 | Chongqing Jinkang New Energy Automobile Co., Ltd. | SF Motors, 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
Apr 2039
Term ends Apr 16, 2039. Maintenance fees still fall due before then
Note
The 133 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
4
later US patents cite this one
That is above the median of utility patents granted in 2021 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.