Corrugated Stormwater Chamber Having Sub-Corrugations

US 9,885,171 Lapsed on the fee record

Lapsed Feb 6, 2022 on the fee record · Medium confidence

Computed 20-year base term

Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 9,255,394, US 9,556,576), so the cap could be lower.

First maintenance fee unpaid; grace period ended.

Held by StormTech LLC

Filed Dec 9, 2016 as application 15/373,830 · Granted Feb 6, 2018

Base term, 20 years from filing

Today

Lapsed Feb 6, 2022

2010 2030

Clock starts
Jun 7, 2010

No longer in force
Feb 6, 2022

Granted
Feb 6, 2018

Term would have run to
Jun 7, 2030

base term after the term ends 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

None

Term adjustment

No prosecution delay on this record.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 8,672,583, US 9,255,394, US 9,556,576, US 9,637,907, to Jun 7, 2030. The term already ends on or before that date, so the cap shortened nothing.

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 7, 2010, when the earliest non-provisional application in its chain was filed (this one was filed Dec 9, 2016)	Jun 7, 2030	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	Disclaimer resolved from the filed document (refs US 8,672,583, US 9,255,394, US 9,556,576, US 9,637,907)	resolves to Jun 7, 2030, no earlier than this term, so no change	Medium confidence
Patent term extension	None on file	no change	High confidence
Fee events	0 of 3 maintenance fees paid	lapsed Feb 6, 2022	High confidence
Computed term end	The steps above, in order	Feb 6, 2022	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.

Corrugated Stormwater Chamber Having Sub-Corrugations

Lapsed Feb 6, 2022 on the fee record · Medium confidence

20-year base term ends Jun 7, 2030

How we calculated this date

Sources