Dielectric cellular electret film and procedure for its manufacture

US 6,852,402 Lapsed on the fee record

Overview Sources & methods

Lapsed Feb 8, 2009 on the fee record · From the USPTO record

Computed 20-year base term

First maintenance fee unpaid; grace period ended.

Named at grant Emfitech Oy · find this owner

Filed Jan 11, 2001 as application 09/759,938 · Granted Feb 8, 2005

Base term, 20 years from filing, plus 47 days of patent term adjustment (USPTO delay)

Today

Lapsed Feb 8, 2009

1995 2026

Clock starts
Aug 11, 1995

No longer in force
Feb 8, 2009

Granted
Feb 8, 2005

Term would have run to
Sep 27, 2015

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

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 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 Aug 11, 1995, when the earliest non-provisional application in its chain was filed (this one was filed Jan 11, 2001); a parent in its chain could not be resolved (the next row)	Aug 11, 2015	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	+47 days, USPTO patent term adjustment record	Sep 27, 2015	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 Feb 8, 2009	High confidence
Computed term end	The steps above, in order	Feb 8, 2009	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.

Dielectric cellular electret film and procedure for its manufacture

Lapsed Feb 8, 2009 on the fee record · From the USPTO record

20-year base term ended Aug 11, 2015

How we calculated this date

Sources