Term ends Feb 8, 2027 · High confidence
20-year base term ends Feb 8, 2027
Held by Eisai, Inc.
Filed Nov 26, 2013 as application 14/091,028 · Granted Aug 23, 2016
Base term plus 4 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2007
2027
Clock starts
Feb 8, 2007
Feb 8, 2007
Term ends
Feb 8, 2027
Feb 8, 2027
Granted
Aug 23, 2016
Aug 23, 2016
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
4
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,623,364.
2 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.
5
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 4 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 2 of 2 maintenance fees are paid so far. 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 Feb 8, 2007, when application 11/672,902, the earliest non-provisional in its chain, was filed (this one was filed Nov 26, 2013) | Feb 8, 2027 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +4 days, USPTO patent term adjustment record | Feb 12, 2027 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,623,364) | capped to Feb 8, 2027 | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Feb 8, 2027 | High confidence |
This family
| US 7,741,450 | In force Feb 2028 | Feb 2028 |
| US 8,318,168 | In force May 2027 | May 2027 |
| US 8,623,364 | Lapsed on the fee record Jan 2026 | Jan 2026 |
| US 9,422,367 | this patent Feb 2027 | Feb 2027 |
| US 10,023,632 | Lapsed on the fee record Jul 2026 | Jul 2026 |
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 21, 2018 Reel 46167, frame 958 | Ebel, Wolfgang | Morphotek, Inc. | Assignment of Assignor's Interest |
| Jun 21, 2018 Reel 46167, frame 803 | Sass, Philip M.; Nicolaides, Nicholas C.; Grasso, Luigi; Li, Jian; Chao, Qimin; Routhier, Eric | Morphotek, Inc. | Assignment of Assignor's Interest |
| Jul 5, 2018 Reel 46498, frame 627 | Morphotek, Inc. | 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
Feb 2027
Term ends Feb 8, 2027. No further fees fall due before then
Note
The 4 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 8,623,364.
Citations
7
later US patents cite this one
That is above the median of utility patents granted in 2016 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.