Novel Revamipide Prodrugs, Preparation Method and Use Thereof

US 11,420,963 Lapsed on the fee record

Overview Sources & methods

Lapsed Aug 23, 2026 on the fee record · High confidence

Computed 20-year base term

First maintenance fee unpaid; grace period ended.

Held by Samjin Pharmaceutical Co., Ltd. and Astech. Co., Ltd.

Filed Dec 25, 2014 as application 14/411,390 · Granted Aug 23, 2022

Base term, 20 years from filing

Today

Lapsed Aug 23, 2026

2013 2033

Clock starts
Jun 26, 2013

No longer in force
Aug 23, 2026

Granted
Aug 23, 2022

Term would have run to
Jun 26, 2033

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

None

Term adjustment

No prosecution delay on this record.

None

Terminal disclaimer

No disclaimer on this record.

0 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.

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 26, 2013, when the earliest non-provisional application in its chain was filed (this one was filed Dec 25, 2014)	Jun 26, 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 2 maintenance fees paid	lapsed Aug 23, 2026	High confidence
Computed term end	The steps above, in order	Aug 23, 2026	High 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.

Novel Revamipide Prodrugs, Preparation Method and Use Thereof

Lapsed Aug 23, 2026 on the fee record · High confidence

20-year base term ends Jun 26, 2033

How we calculated this date

Sources