Helical rotor of a progressing cavity pump

US 9,631,619 Lapsed on the fee record

Overview Sources & methods

Lapsed Apr 25, 2021 on the fee record · From the USPTO record

Computed 20-year base term

First maintenance fee unpaid; grace period ended.

Named at grant PCM Technologies · find this owner

Filed Aug 28, 2014 as application 14/471,994 · Granted Apr 25, 2017

Base term, 20 years from filing, plus 295 days of patent term adjustment (USPTO delay)

Today

Lapsed Apr 25, 2021

2014 2035

Clock starts
Aug 28, 2014

No longer in force
Apr 25, 2021

Granted
Apr 25, 2017

Term would have run to
Jun 19, 2035

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

295

Days of term adjustment

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

None

Terminal disclaimer

No disclaimer on this record.

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 Aug 28, 2014, when this application, 14/471,994, was filed	Aug 28, 2034	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+295 days, USPTO patent term adjustment record	Jun 19, 2035	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 3 maintenance fees paid	lapsed Apr 25, 2021	High confidence
Computed term end	The steps above, in order	Apr 25, 2021	From the USPTO record

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.

Helical rotor of a progressing cavity pump

Lapsed Apr 25, 2021 on the fee record · From the USPTO record

20-year base term ends Aug 28, 2034

How we calculated this date

Sources