Term ends Dec 23, 2029 · High confidence
20-year base term ends May 14, 2029
Filed Nov 12, 2010 as application 12/945,486 · Granted Mar 12, 2013
Base term plus 223 days of patent term adjustment (USPTO delay)
Today
2009
2029
Clock starts
May 14, 2009
May 14, 2009
Term ends
Dec 23, 2029
Dec 23, 2029
Granted
Mar 12, 2013
Mar 12, 2013
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
223
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
2
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 223 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 May 14, 2009, when application PCT/KR2009/002551, the earliest non-provisional in its chain, was filed (this one was filed Nov 12, 2010) | May 14, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +223 days, USPTO patent term adjustment record | Dec 23, 2029 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 23, 2029 | High confidence |
This family
| US 8,395,144 | this patent Dec 2029 | Dec 2029 |
1 of 2 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 |
|---|---|---|---|
| Nov 15, 2010 Reel 25362, frame 964 | Lee, Eunjung; Lee, Jung-sub; Kim, Tae-hyung; Kim, Kyoung-soo | Doosan Corporation | Assignment of Assignor's Interest |
| Jun 18, 2020 Reel 52971, frame 480 | Doosan Corporation | Doosan Corporation | Change of Address |
| Jun 18, 2020 Reel 52970, frame 277 | Doosan Corporation | Doosan Solus Co., Ltd. | Assignment of Assignor's Interest |
| Jan 4, 2021 Reel 54887, frame 911 | 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 2029
Term ends Dec 23, 2029. No further fees fall due before then
Note
The 223 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is above the median of utility patents granted in 2013 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.