Term ends May 11, 2031 · Low confidence
20-year base term ends Jul 29, 2030
Grace period ended Nov 11, 2026 · no payment on record as of the Nov 10, 2026 fee file · lapse expected
Held by Quantum Bio Solutions Co., Ltd.
Filed Jul 29, 2010 as application 12/846,394 · Granted Nov 11, 2014
Base term plus 286 days of patent term adjustment (USPTO delay)
Today
2010
2031
Clock starts
Jul 29, 2010
Jul 29, 2010
Term ends
May 11, 2031
May 11, 2031
Granted
Nov 11, 2014
Nov 11, 2014
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
286
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
This patent's term runs 286 days past its 20-year base term on prosecution delay. 2 of 3 maintenance fees are paid so far. Confidence: Low: the grace period for its third maintenance fee ended Nov 11, 2026 with no payment on record. 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 Jul 29, 2010, when this application, 12/846,394, was filed | Jul 29, 2030 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +286 days, USPTO patent term adjustment record | May 11, 2031 | 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 | The grace period ended with no payment on record in the fee file | grace period ended Nov 11, 2026 | Low confidence |
| Computed term end | The steps above, in order | May 11, 2031 | Low confidence |
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 |
|---|---|---|---|
| Aug 2, 2010 Reel 24773, frame 555 | Cho, Art Eunsung | Korea University Research and Business Foundation | Assignment of Assignor's Interest |
| Apr 1, 2011 Reel 26062, frame 691 | Korea University Research and Business Foundation | Korea University Holdings Co., Ltd. | Assignment of Assignor's Interest |
| Dec 27, 2011 Reel 27445, frame 740 | Korea University Holdings Co., Ltd. | Quantum Bio Solutions 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.
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Alerts on its grants, lapses and transfers.
What's changing
Nov 11
Grace period ended Nov 11, 2026 with no payment on record. The term ends early once USPTO posts the lapse
May 2031
Term ends May 11, 2031.
Note
The 286 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2014 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.