Carbon Nanotube and Secondary Battery

US 12,609,323 In force

Term ends May 29, 2039 · Medium confidence

Computed 20-year base term

Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 11,923,546), so the cap could be lower.

Held by Toyocolor Co., Ltd.

Filed Jan 23, 2024 as application 18/420,729 · Granted Apr 21, 2026

Base term plus 208 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer

Today

20 years from filing

Term ends May 29, 2039

2019 2039

Clock starts
Jun 17, 2019

Term ends
May 29, 2039

Granted
Apr 21, 2026

base term after the term ends 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

208

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 11,286,164, US 11,923,546.

0 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.

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 Jun 17, 2019, when the earliest non-provisional application in its chain was filed (this one was filed Jan 23, 2024)	Jun 17, 2039	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+208 days, USPTO patent term adjustment record	Jan 11, 2040	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 11,286,164, US 11,923,546)	capped to May 29, 2039	Medium confidence
Patent term extension	None on file	no change	High confidence
Fee events	0 of 3 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	May 29, 2039	Medium confidence

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.

Not on this page: the patent's family, its recorded assignments and its citation count. USPTO's assignment records, linked above, list every recorded assignment.

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.

Carbon Nanotube and Secondary Battery

Term ends May 29, 2039 · Medium confidence

20-year base term ends Jun 17, 2039

How we calculated this date

Sources