Term ends Oct 24, 2029 · High confidence
20-year base term ends Jul 25, 2028
Held by Eisai Inc.
Filed Jul 25, 2008 as application 12/180,408 · Granted Dec 17, 2013
Base term plus 456 days of patent term adjustment (USPTO delay)
Today
2008
2029
Clock starts
Jul 25, 2008
Jul 25, 2008
Term ends
Oct 24, 2029
Oct 24, 2029
Granted
Dec 17, 2013
Dec 17, 2013
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
456
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.
4
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 456 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 Jul 25, 2008, when this application, 12/180,408, was filed | Jul 25, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +456 days, USPTO patent term adjustment record | Oct 24, 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 | Oct 24, 2029 | High confidence |
This family
| US 8,609,640 | this patent Oct 2029 | Oct 2029 |
| US 8,937,056 | In force Jul 2028 | Jul 2028 |
| Application 14/595,746 | Abandoned not computed | not computed |
| US 11,160,783 | In force Jul 2028 | Jul 2028 |
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 11, 2009 Reel 22376, frame 103 | Agoulnik, Sergei; Decosta, Bruce; Du, Hong; Jiang, Yimin; Li, Xiang-yi; Nomoto, Kenichi; Wang, John (Yuan); Zhang, Huiming | Eisai R&D Management Co., Ltd. | Assignment of Assignor's Interest |
| Jul 11, 2013 Reel 30778, frame 406 | Wu, Jiayi | Eisai 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
Oct 2029
Term ends Oct 24, 2029. No further fees fall due before then
Note
The 456 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
1
later US patent cites this one
That is below 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.