Water Combustion Technology - Methods, Processes, Systems and Apparatus for the Combustion of Hydrogen and Oxygen

US 8,161,748 Lapsed on the fee record

Overview Sources & methods

Lapsed Apr 24, 2016 on the fee record · Medium confidence

Computed 20-year base term

Why Medium: A parent in the chain could not be resolved.

First maintenance fee unpaid; grace period ended.

Held by Clearvalue Technologies, Inc.

Filed Mar 1, 2004 as application 10/790,316 · Granted Apr 24, 2012

Base term, 20 years from filing

Today

Lapsed Apr 24, 2016

2003 2026

Clock starts
Apr 10, 2003

No longer in force
Apr 24, 2016

Granted
Apr 24, 2012

Term would have run to
Apr 10, 2023

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.

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 Apr 10, 2003, when the earliest non-provisional application in its chain was filed (this one was filed Mar 1, 2004); a parent in its chain could not be resolved (the next row)	Apr 10, 2023	High confidence
Continuity chain	A parent in the chain could not be resolved	dated from this application's own claim	Medium 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 Apr 24, 2016	High confidence
Computed term end	The steps above, in order	Apr 24, 2016	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.

Water Combustion Technology - Methods, Processes, Systems and Apparatus for the Combustion of Hydrogen and Oxygen

Lapsed Apr 24, 2016 on the fee record · Medium confidence

20-year base term ended Apr 10, 2023

How we calculated this date

Sources