Method and apparatus for optical performance monitoring

US 7,885,541 Lapsed on the fee record

Overview Sources & methods

Lapsed Feb 8, 2023 on the fee record · From the USPTO record

Computed 20-year base term

Third maintenance fee unpaid; grace period ended.

Named at grant Dynamic Method Enterprise Limited · find this owner

Filed Feb 22, 2005 as application 11/064,330 · Granted Feb 8, 2011

Base term, 20 years from filing, plus 644 days of patent term adjustment (USPTO delay)

Today

Lapsed Feb 8, 2023

2005 2026

Clock starts
Feb 22, 2005

No longer in force
Feb 8, 2023

Granted
Feb 8, 2011

Term would have run to
Nov 28, 2026

base term patent term adjustment 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

644

Days of term adjustment

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

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, 20 years from filing	Clock starts Feb 22, 2005, when this application, 11/064,330, was filed	Feb 22, 2025	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+644 days, USPTO patent term adjustment record	Nov 28, 2026	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 8, 2023	High confidence
Computed term end	The steps above, in order	Feb 8, 2023	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.

Method and apparatus for optical performance monitoring

Lapsed Feb 8, 2023 on the fee record · From the USPTO record

20-year base term ended Feb 22, 2025

How we calculated this date

Sources