Catalyst Mixture for the Treatment of Waste Gas

US 11,369,922 Lapsed on the fee record

Overview Sources & methods

Lapsed Jun 28, 2026 on the fee record · Medium confidence

Computed 20-year base term

Why Medium: A terminal disclaimer is on file (approved) with no resolved reference, so the term may end earlier.

First maintenance fee unpaid; grace period ended.

Held by Cppe Carbon Process & Plant Engineering S.A.

Filed Oct 3, 2018 as application 16/091,096 · Granted Jun 28, 2022

Base term, 20 years from filing, plus 322 days of patent term adjustment (USPTO delay)

Today

Lapsed Jun 28, 2026

2017 2038

Clock starts
Apr 4, 2017

No longer in force
Jun 28, 2026

Granted
Jun 28, 2022

Term would have run to
Feb 20, 2038

base term patent term adjustment 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

322

Days of term adjustment

Read from the USPTO patent term adjustment record, not recalculated here.

Unresolved

Terminal disclaimer

On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.

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 Apr 4, 2017, when the earliest non-provisional application in its chain was filed (this one was filed Oct 3, 2018)	Apr 4, 2037	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+322 days, USPTO patent term adjustment record	Feb 20, 2038	High confidence
Terminal disclaimer cap	Disclaimer on file (approved), reference document not resolved	no cap applied, and none guessed	Medium confidence
Patent term extension	None on file	no change	High confidence
Fee events	0 of 3 maintenance fees paid	lapsed Jun 28, 2026	High confidence
Computed term end	The steps above, in order	Jun 28, 2026	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.

Catalyst Mixture for the Treatment of Waste Gas

Lapsed Jun 28, 2026 on the fee record · Medium confidence

20-year base term ends Apr 4, 2037

How we calculated this date

Sources