Term ends Apr 23, 2027 · High confidence
20-year base term ends Apr 23, 2027
Filed Apr 23, 2007 as application 11/738,697 · Granted Jan 12, 2010
Base term, 20 years from filing
Today
2007
2027
Clock starts
Apr 23, 2007
Apr 23, 2007
Term ends
Apr 23, 2027
Apr 23, 2027
Granted
Jan 12, 2010
Jan 12, 2010
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.
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.
22
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. 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 Apr 23, 2007, when this application, 11/738,697, was filed | Apr 23, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Apr 23, 2027 | High confidence |
This family
| US 7,589,042 | Term ended no later than Aug 2026 | no later than Aug 2026 |
| US 7,645,715 | this patent Apr 2027 | Apr 2027 |
| US 7,645,844 | In force Jan 2029 | Jan 2029 |
| US 8,742,043 | Lapsed on the fee record Jun 2026 | Jun 2026 |
| US 7,833,926 | Term ended Nov 2025 | Nov 2025 |
| US 8,067,511 | In force Nov 2029 | Nov 2029 |
| US 7,928,173 | In force Sep 2029 | Sep 2029 |
| US 8,334,354 | In force Feb 2031 | Feb 2031 |
8 of 22 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 18, 2007 Reel 19444, frame 122 | Ok, Myung-ahn; Hahn, Jong-sok; Shin, Dae Ho; Kang, Sang-ook; Kim, Tae Eung | SK Corporation | Assignment of Assignor's Interest |
| Jun 27, 2007 Reel 19486, frame 454 | Ok, Myung-ahn; Hahn, Jong-sok; Shin, Dae Ho; Kang, Sang-ook; Kim, Tae-jin | SK Corporation | Corrective Assignment to Correct the Name of the Conveying Party Previously Recorded at Reel 019444 Frame 0122. |
| Dec 14, 2007 Reel 20249, frame 17 | SK Corporation | SK Energy Co., Ltd. | Assignment of Assignor's Interest |
| Jul 14, 2011 Reel 26619, frame 330 | SK Energy Co., Ltd. | SK Innovation Co., Ltd. | Change of Name |
| Sep 23, 2015 Reel 36635, frame 906 | SK Innovation Co., Ltd. | SABIC SK Nexlene Company Pte. Ltd. | Assignment of Assignor's Interest |
| Apr 11, 2016 Reel 38406, frame 201 | SK Energy Co., Ltd. | SK Innovation Co., Ltd. | Corrective Assignment to Correct the Incorrect Patent Number 7448700 and Replace It with 7488700 Previously Recorded on Reel 026619 Frame 0330. Assignor(S) Hereby Confirms the 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
Apr 2027
Term ends Apr 23, 2027. No further fees fall due before then
Citations
2
later US patents cite this one
That is below the median of utility patents granted in 2010 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.