Also listed on Ktfreetel Co., Ltd., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 28, 2026 · High confidence
20-year base term ended Sep 7, 2025
Held by KT Corporation
Filed Oct 13, 2009 as application 11/720,923 · Granted Sep 27, 2011
Base term plus 477 days of patent term adjustment (USPTO delay)
Today
2005
2026
Clock starts
Sep 7, 2005
Sep 7, 2005
Term ends
Dec 28, 2026
Dec 28, 2026
Granted
Sep 27, 2011
Sep 27, 2011
base term
patent term adjustment
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
477
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 477 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 Sep 7, 2005, when application PCT/KR2005/002961, the earliest non-provisional in its chain, was filed (this one was filed Oct 13, 2009) | Sep 7, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +477 days, USPTO patent term adjustment record | Dec 28, 2026 | 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 28, 2026 | High confidence |
This family
| US 8,027,368 | this patent Dec 2026 | Dec 2026 |
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 |
|---|---|---|---|
| Jul 20, 2009 Reel 22976, frame 32 | Ktfreetel Co., Ltd. | KT Corporation | Merger |
| Oct 13, 2009 Reel 23363, frame 305 | Lee, Nam-suk; Park, Nam-hoon | Samsung Electronics Co., Ltd.; Electronics and Telecommunications Research Institute; KT Corporation; SK Telecom Co., Ltd.; Ktfreetel Co., Ltd.; Hanaro Telecom, Inc. | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | Samsung Electronics Co., Ltd. | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | Electronics and Telecommunications Research Institute | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | KT Corporation | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | SK Telecom Co., Ltd. | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | Ktfreetel Co., Ltd. | Assignment of Assignor's Interest |
| Oct 13, 2009 reel/frame not recorded | Lee, Nam-suk; Park, Nam-hoon | Hanaro Telecom, Inc. | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Dec 2026
Term ends Dec 28, 2026. No further fees fall due before then
Note
The 477 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
17
later US patents cite this one
That is above the median of utility patents granted in 2011 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.