Term ends Aug 29, 2033 · High confidence
20-year base term ends Aug 29, 2033
Held by Idemitsu Kosan Co., Ltd.
Filed Dec 26, 2017 as application 15/854,404 · Granted Oct 6, 2026
Base term, 20 years from filing
Today
2013
2033
Clock starts
Aug 29, 2013
Aug 29, 2013
Term ends
Aug 29, 2033
Aug 29, 2033
Granted
Oct 6, 2026
Oct 6, 2026
base term
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
0 of 1
Maintenance fees paid
One maintenance fee can end this term early, the one due 3.5 years from grant; the next one's grace period runs past the term end. This counts it if the record shows it paid.
6
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 is its 20-year base term, with no adjustment for prosecution delay. 0 of 1 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 Aug 29, 2013, when application PCT/JP2013/073187, the earliest non-provisional in its chain, was filed (this one was filed Dec 26, 2017) | Aug 29, 2033 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | 0 of 1 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Aug 29, 2033 | High confidence |
This family
| US 10,014,477 | In force Jun 2034 | Jun 2034 |
| US 12,753,145 | this patent Aug 2033 | Aug 2033 |
| US 11,362,279 | In force no later than Aug 2033 | no later than Aug 2033 |
| US 11,444,246 | In force no later than Aug 2033 | no later than Aug 2033 |
| US 12,790,288 | In force Aug 2033 | Aug 2033 |
5 of 6 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.
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.
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Alerts on its grants, lapses and transfers.
What's changing
Aug 2033
Term ends Aug 29, 2033. Maintenance fees still fall due before then
Citations
We have no citation count for this patent yet. That is not the same as never having been cited.
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.