Term ends Dec 21, 2035 · High confidence
20-year base term ends Dec 24, 2035
Filed Jun 23, 2017 as application 15/539,223 · Granted Feb 9, 2021
Base term plus 179 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2015
2035
Clock starts
Dec 24, 2015
Dec 24, 2015
Term ends
Dec 21, 2035
Dec 21, 2035
Granted
Feb 9, 2021
Feb 9, 2021
base term
after the term ends
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
179
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 9,960,363.
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.
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 runs 179 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 24, 2015, when application PCT/KR2015/014222, the earliest non-provisional in its chain, was filed (this one was filed Jun 23, 2017) | Dec 24, 2035 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +179 days, USPTO patent term adjustment record | Jun 20, 2036 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 9,960,363) | capped to Dec 21, 2035 | 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 | Dec 21, 2035 | High confidence |
This family
| US 10,916,709 | this patent Dec 2035 | Dec 2035 |
| US 11,832,514 | In force Dec 2035 | Dec 2035 |
| US 11,997,924 | In force no later than Dec 2036 | no later than Dec 2036 |
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 |
|---|---|---|---|
| Jun 23, 2017 Reel 42796, frame 574 | Eum, Min-sik; Son, Hojun; Park, Woo Jae; Kim, Tae Hyung; Kim, Jiyi; Beak, Youngmi | Doosan Corporation | Assignment of Assignor's Interest |
| Mar 16, 2020 Reel 52128, frame 274 | Doosan Corporation | Doosan Solus Co., Ltd. | Assignment of Assignor's Interest |
| Dec 29, 2020 Reel 54867, frame 169 | Doosan Solus Co., Ltd. | Solus Advanced Materials Co., Ltd. | Change of Name |
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
Dec 2035
Term ends Dec 21, 2035. Maintenance fees still fall due before then
Note
The 179 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 9,960,363.
Citations
21
later US patents cite this one
That is top 10% 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.