Lapsed Jun 3, 2026 on the fee record · High confidence
20-year base term ends Oct 30, 2027
Third maintenance fee unpaid; grace period ended.
Filed May 1, 2009 as application 12/312,278 · Granted Jun 3, 2014
Base term, 20 years from filing, plus 778 days of patent term adjustment (USPTO delay)
Today
Lapsed Jun 3, 2026
2007
2029
Clock starts
Oct 30, 2007
Oct 30, 2007
No longer in force
Jun 3, 2026
Jun 3, 2026
Granted
Jun 3, 2014
Jun 3, 2014
Term would have run to
Dec 16, 2029
Dec 16, 2029
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
778
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.
22
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 Dec 16, 2029: its 20-year base term plus 778 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 Oct 30, 2007, when application PCT/KR2007/005393, the earliest non-provisional in its chain, was filed (this one was filed May 1, 2009) | Oct 30, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +778 days, USPTO patent term adjustment record | Dec 16, 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 | 2 of 3 maintenance fees paid | lapsed Jun 3, 2026 | High confidence |
| Computed term end | The steps above, in order | Jun 3, 2026 | High confidence |
This family
| US 7,589,042 | Term ended no later than Aug 2026 | no later than Aug 2026 |
| US 7,645,715 | In force Apr 2027 | Apr 2027 |
| US 7,645,844 | In force Jan 2029 | Jan 2029 |
| US 8,742,043 | this patent 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 |
|---|---|---|---|
| May 1, 2009 Reel 22655, frame 81 | Ok, Myung Ahn; Shin, Dae Ho; Hahn, Jong Sok; Lee, Ho Seong; Kang, Sang Ook; Kim, Sung Kwan | 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
Note
The 778 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.