Portable Sound Reproducing System and Method

US 8,170,700 Term ended

Overview Sources & methods

Term ended Apr 24, 2021 · Low confidence

Computed 20-year base term

USPTO later recorded it as expired for non-payment on Jun 3, 2024.

Held by Mpman.com, Inc.

Filed Apr 26, 2006 as application 11/411,546 · Granted May 1, 2012

Base term plus 1495 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer

Today

20 years from filing

Term ended Apr 24, 2021

1998 2026

Clock starts
Apr 17, 1998

Term ended
Apr 24, 2021

Granted
May 1, 2012

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

1,495

Days of term adjustment

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

Capped

Terminal disclaimer

Resolved from the filed document, referencing US 7,065,417.

2 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 Apr 17, 1998, when the earliest non-provisional application in its chain was filed (this one was filed Apr 26, 2006); a parent in its chain could not be resolved (the next row)	Apr 17, 2018	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	+1495 days, USPTO patent term adjustment record	May 21, 2022	High confidence
Terminal disclaimer cap	Disclaimer resolved from the filed document (refs US 7,065,417)	capped to Apr 24, 2021	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	2 of 2 maintenance fees paid	term ended	High confidence
USPTO status record	Recorded as expired for non-payment on Jun 3, 2024, after the term ended	no change	High confidence
Further caveats on record	The record names parents not resolved: 09061647, 09061647	Low confidence overall	Low confidence
Computed term end	The steps above, in order	Apr 24, 2021	Low 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.

Portable Sound Reproducing System and Method

Term ended Apr 24, 2021 · Low confidence

20-year base term ended Apr 17, 2018

How we calculated this date

Sources