Location System and Method for Assisting Emergency Services in Identifying the Physical Location of an IP Telephony User

US 8,937,951 Lapsed on the fee record

Overview Sources & methods

Lapsed Jan 20, 2019 on the fee record · High confidence

Computed 20-year base term

First maintenance fee unpaid; grace period ended.

Held by Phybridge Inc.

Filed Sep 23, 2011 as application 13/242,168 · Granted Jan 20, 2015

Base term, 20 years from filing

Today

Lapsed Jan 20, 2019

2007 2027

Clock starts
Jul 13, 2007

No longer in force
Jan 20, 2019

Granted
Jan 20, 2015

Term would have run to
Jul 13, 2027

base term after the term ends Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know

None

Term adjustment

No prosecution delay on this record.

No effect

Terminal disclaimer

Resolved from the filed document, referencing US 8,059,631, to Jul 13, 2027. The term already ends on or before that date, so the cap shortened nothing.

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 Jul 13, 2007, when the earliest non-provisional application in its chain was filed (this one was filed Sep 23, 2011)	Jul 13, 2027	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	Disclaimer resolved from the filed document (refs US 8,059,631)	resolves to Jul 13, 2027, no earlier than this term, so no change	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	0 of 3 maintenance fees paid	lapsed Jan 20, 2019	High confidence
Computed term end	The steps above, in order	Jan 20, 2019	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.

Location System and Method for Assisting Emergency Services in Identifying the Physical Location of an IP Telephony User

Lapsed Jan 20, 2019 on the fee record · High confidence

20-year base term ends Jul 13, 2027

How we calculated this date

Sources