Methods and apparatus for mechanically and electronically correcting presentation of entities in a fluid flow

US 6,188,479 Lapsed on the fee record

Overview Sources & methods

Lapsed Feb 13, 2013 on the fee record · From the USPTO record

Computed 20-year base term

Third maintenance fee unpaid; grace period ended.

Named at grant Zellweger Uster, Inc. · find this owner

Filed Feb 21, 1995 as application 08/395,376 · Granted Feb 13, 2001

Base term, 17 years from grant or 20 from filing, whichever is later

Today

Lapsed Feb 13, 2013

1995 2026

Clock starts
Feb 21, 1995

No longer in force
Feb 13, 2013

Granted
Feb 13, 2001

Term would have run to
Feb 13, 2018

base term after the term ends fee events 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.

2 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, the 1995 transition rule	Granted Feb 13, 2001 + 17 years, or clock starts Feb 21, 1995 + 20 years, whichever is later	Feb 13, 2018	High confidence
Continuity chain	Every parent in the chain resolved	no change	High 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	2 of 3 maintenance fees paid	lapsed Feb 13, 2013	High confidence
Computed term end	The steps above, in order	Feb 13, 2013	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.

Methods and apparatus for mechanically and electronically correcting presentation of entities in a fluid flow

Lapsed Feb 13, 2013 on the fee record · From the USPTO record

20-year base term ended Feb 13, 2018

How we calculated this date

Sources