Also listed on Quantum Biosystems Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Mar 1, 2031 · Medium confidence
20-year base term ends Mar 1, 2031
Why Medium: A parent in the chain could not be resolved.
Held by Osaka University
Filed Dec 28, 2018 as application 16/234,908 · Granted Dec 29, 2020
Base term, 20 years from filing
Today
2011
2031
Clock starts
Mar 1, 2011
Mar 1, 2011
Term ends
Mar 1, 2031
Mar 1, 2031
Granted
Dec 29, 2020
Dec 29, 2020
base term
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
4
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. 1 of 2 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 Mar 1, 2011, when application PCT/JP2011/054631, the earliest non-provisional in its chain, was filed (this one was filed Dec 28, 2018); a parent in its chain could not be resolved (the next row) | Mar 1, 2031 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | None on file | no change | 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 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Mar 1, 2031 | Medium confidence |
This family
| US 9,194,838 | In force Oct 2032 | Oct 2032 |
| US 10,202,644 | In force Mar 2031 | Mar 2031 |
| US 10,876,159 | this patent Mar 2031 | Mar 2031 |
3 of 4 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 |
|---|---|---|---|
| Dec 31, 2018 Reel 47876, frame 676 | Taniguchi, Masateru; Tsutsui, Makusu; Yokota, Kazumichi; Kawai, Tomoji | Osaka University | Assignment of Assignor's Interest |
| Dec 31, 2018 Reel 47876, frame 678 | Osaka University | Quantum Biosystems Inc. | Assignment of Assignor's Interest |
| Jul 6, 2021 Reel 56761, frame 222 | Quantum Biosystems Inc. | Osaka University | 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
Mar 2031
Term ends Mar 1, 2031. Maintenance fees still fall due before then
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2020 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.