Term ends Jan 26, 2039 · High confidence
20-year base term ends Feb 28, 2037
Held by Quantum Cat Co., Ltd.
Filed Mar 15, 2019 as application 16/333,998 · Granted Jan 31, 2023
Base term plus 697 days of patent term adjustment (USPTO delay)
Today
2017
2039
Clock starts
Feb 28, 2017
Feb 28, 2017
Term ends
Jan 26, 2039
Jan 26, 2039
Granted
Jan 31, 2023
Jan 31, 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
697
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.
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 runs 697 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 Feb 28, 2017, when application PCT/KR2017/002203, the earliest non-provisional in its chain, was filed (this one was filed Mar 15, 2019) | Feb 28, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +697 days, USPTO patent term adjustment record | Jan 26, 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 | Jan 26, 2039 | High confidence |
This family
| US 11,565,245 | this patent Jan 2039 | Jan 2039 |
| US 12,251,689 | In force Aug 2037 | Aug 2037 |
2 of 3 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 |
|---|---|---|---|
| Mar 18, 2019 Reel 48629, frame 230 | Choi, Sung Min; Kang, Shin Hyun | Korea Advanced Institute of Science and Technology | Assignment of Assignor's Interest |
| Mar 19, 2019 Reel 48640, frame 742 | Choi, Sung Min; Kang, Shin Hyun | Korea Advanced Institute of Science and Technology | Assignment of Assignor's Interest |
| Jul 18, 2024 Reel 68020, frame 978 | Korea Advanced Institute of Science and Technology | Quantum Cat Co., Ltd. | 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 Jan 26, 2039. Maintenance fees still fall due before then
Note
The 697 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
1
later US patent cites this one
That is below the median 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.