Lapsed Aug 15, 2025 on the fee record · High confidence
20-year base term ends Jan 30, 2028
Second maintenance fee unpaid; grace period ended.
Held by Chugai Seiyaku Kabushiki Kaisha
Filed Dec 1, 2014 as application 14/556,684 · Granted Aug 15, 2017
Base term, 20 years from filing, plus 387 days of patent term adjustment (USPTO delay)
Today
Lapsed Aug 15, 2025
2008
2029
Clock starts
Jan 30, 2008
Jan 30, 2008
No longer in force
Aug 15, 2025
Aug 15, 2025
Granted
Aug 15, 2017
Aug 15, 2017
Term would have run to
Feb 20, 2029
Feb 20, 2029
base term
patent term adjustment
after the term ends
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
387
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
3
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 Feb 20, 2029: its 20-year base term plus 387 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 Jan 30, 2008, when application PCT/JP2008/051333, the earliest non-provisional in its chain, was filed (this one was filed Dec 1, 2014) | Jan 30, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +387 days, USPTO patent term adjustment record | Feb 20, 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 | 1 of 2 maintenance fees paid | lapsed Aug 15, 2025 | High confidence |
| Computed term end | The steps above, in order | Aug 15, 2025 | High confidence |
This family
| US 8,946,385 | In force Sep 2030 | Sep 2030 |
| US 9,733,245 | this patent Aug 2025 | Aug 2025 |
2 of 3 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 |
|---|---|---|---|
| Aug 4, 2016 Reel 39345, frame 640 | Kawai, Shigeto | Forerunner Pharma Research Co., Ltd. | Assignment of Assignor's Interest |
| Aug 4, 2016 Reel 39345, frame 629 | Forerunner Pharma Research Co., Ltd. | Chugai Seiyaku Kabushiki Kaisha | 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
Note
The 387 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
10
later US patents cite this one
That is above the median of utility patents granted in 2017 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.