Term ends Feb 19, 2040 · High confidence
20-year base term ends Oct 2, 2039
Held by Delta Electronics, Inc.
Filed May 25, 2021 as application 17/330,270 · Granted Apr 11, 2023
Base term plus 140 days of patent term adjustment (USPTO delay)
Today
2019
2040
Clock starts
Oct 2, 2019
Oct 2, 2019
Term ends
Feb 19, 2040
Feb 19, 2040
Granted
Apr 11, 2023
Apr 11, 2023
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
140
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.
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 runs 140 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 Oct 2, 2019, when application 16/591,451, the earliest non-provisional in its chain, was filed (this one was filed May 25, 2021) | Oct 2, 2039 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +140 days, USPTO patent term adjustment record | Feb 19, 2040 | 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 | Feb 19, 2040 | High confidence |
This family
| US 11,158,451 | In force Oct 2039 | Oct 2039 |
| US 11,626,237 | this patent Feb 2040 | Feb 2040 |
| US 11,881,344 | In force Oct 2039 | Oct 2039 |
| US 12,217,899 | In force Oct 2039 | Oct 2039 |
| Application 18/974,254 | Pending not computed | not computed |
| US 12,695,023 | In force Oct 2039 | Oct 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 |
|---|---|---|---|
| May 25, 2021 Reel 56349, frame 580 | Xiong, Yahong; Jin, Da; Su, Qinghua | Delta Electronics, 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
Feb 2040
Term ends Feb 19, 2040. Maintenance fees still fall due before then
Note
The 140 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 top 25% of utility patents granted in 2023 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.