Pulse Width Modulation with Discharge to Suction Bypass

US 10,006,681 Lapsed on the fee record

Lapsed Jun 26, 2022 on the fee record · High confidence

Computed 20-year base term

First maintenance fee unpaid; grace period ended.

Filed Apr 29, 2009 as application 12/447,728 · Granted Jun 26, 2018

Base term, 20 years from filing, plus 2589 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer

Today

Lapsed Jun 26, 2022

2006 2029

Clock starts
Dec 26, 2006

No longer in force
Jun 26, 2022

Granted
Jun 26, 2018

Term would have run to
Jan 4, 2029

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

2,589

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 8,276,395.

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 Dec 26, 2006, when the earliest non-provisional application in its chain was filed (this one was filed Apr 29, 2009)	Dec 26, 2026	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+2589 days, USPTO patent term adjustment record	Jan 27, 2034	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 8,276,395)	capped to Jan 4, 2029	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	0 of 2 maintenance fees paid	lapsed Jun 26, 2022	High confidence
Computed term end	The steps above, in order	Jun 26, 2022	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.

Pulse Width Modulation with Discharge to Suction Bypass

Lapsed Jun 26, 2022 on the fee record · High confidence

20-year base term ends Dec 26, 2026

How we calculated this date

Sources