Lapsed Sep 11, 2020 on the fee record · High confidence
20-year base term ends Mar 10, 2028
Second maintenance fee unpaid; grace period ended.
Filed Mar 10, 2008 as application 12/045,404 · Granted Sep 11, 2012
Base term, 20 years from filing, plus 726 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 11, 2020
2008
2030
Clock starts
Mar 10, 2008
Mar 10, 2008
No longer in force
Sep 11, 2020
Sep 11, 2020
Granted
Sep 11, 2012
Sep 11, 2012
Term would have run to
Mar 6, 2030
Mar 6, 2030
base term
patent term adjustment
after the term ends
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
726
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.
11
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Mar 6, 2030: its 20-year base term plus 726 days of term adjustment for prosecution delay. 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 Mar 10, 2008, when this application, 12/045,404, was filed | Mar 10, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +726 days, USPTO patent term adjustment record | Mar 6, 2030 | 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 | lapsed Sep 11, 2020 | High confidence |
| Computed term end | The steps above, in order | Sep 11, 2020 | High confidence |
This family
| Application 11/803,297 | Abandoned not computed | not computed |
| US 8,685,203 | In force Sep 2031 | Sep 2031 |
| US 7,962,989 | In force Apr 2030 | Apr 2030 |
| US 8,033,378 | In force Nov 2028 | Nov 2028 |
| Application 11/825,684 | Abandoned not computed | not computed |
| Application 11/881,012 | Abandoned not computed | not computed |
| US 7,776,142 | In force Jun 2028 | Jun 2028 |
| US 8,261,687 | this patent Sep 2020 | Sep 2020 |
8 of 11 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 10, 2008 Reel 20625, frame 347 | Kim, Sung-soo; Hwang, Ho-soo | Semes Co., Ltd. | Assignment of Assignor's Interest |
| Oct 13, 2011 Reel 27054, frame 48 | Semes Co., Ltd. | Korea Kumho Petrochemical Co., Ltd. | Change of Name |
| Oct 20, 2011 Reel 27094, frame 479 | Semes Co., Ltd. | Korea Kumho Petrochemical Co., Ltd. | Assignment of Assignor's Interest |
| Oct 25, 2011 Reel 27113, frame 57 | Semes Co., Ltd. | Korea Kumho Petrochemical Co., Ltd. | Corrective Assignment to Correct the Address of the Receiving Party Previously Recorded on Reel 027094 Frame 0479. Assignor(S) Hereby Confirms the 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.
What's changing
Note
The 726 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
3
later US patents cite this one
That is below the median of utility patents granted in 2012 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.