Also listed on Willfire HC, LLC, an earlier holder on the record. The recorded assignments below show how it moved.

Term ends no later than Sep 6, 2028 · Low confidence

Computed 20-year base term

In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.

Held by Tyco Fire Products LP

Filed Feb 9, 2007 as application 11/659,934 · Granted Sep 20, 2016

Base term plus 1479 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Ends no later than Sep 6, 2028

2004 2028

Clock starts
Aug 19, 2004

Ends no later than
Sep 6, 2028

Granted
Sep 20, 2016

base term patent term adjustment 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

1,479

Days of term adjustment

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

Unresolved

Terminal disclaimer

On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.

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.

Family applications on record here

Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term runs 1479 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 2 of 2 maintenance fees are paid so far. Confidence: Low. from the record

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 19, 2004, when application PCT/US2004/026762, the earliest non-provisional in its chain, was filed (this one was filed Feb 9, 2007); a parent in its chain could not be resolved (the next row)	Aug 19, 2024	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	+1479 days, USPTO patent term adjustment record	Sep 6, 2028	High confidence
Terminal disclaimer cap	Disclaimer on file (approved), reference document not resolved	no cap applied, and none guessed	Medium confidence
Patent term extension	None on file	no change	High confidence
Fee events	2 of 2 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	no later than Sep 6, 2028	Low confidence

This family

Application 10/568,520	Abandoned not computed	not computed
US 9,446,268	this patent no later than Sep 2028	no later than Sep 2028

2 of 4 applications in this family shown, earliest filings first. The applications whose file history this site holds. The family may have others.

Assignments

Assignment documents as recorded at the USPTO, oldest first, with the reel and frame each was recorded at. A recorded assignment is a filed document, not a statement of current ownership, and the absence of a later one is not evidence that the last one still stands.

Recorded	Assignor	Assignee	Conveyance
Apr 9, 2007 Reel 19220, frame 930	Williams, Dwight P.	Williams Fire and Hazard Control, Inc.	Assignment of Assignor's Interest
Nov 3, 2011 Reel 27171, frame 519	Williams Fire and Hazard Control, Inc.	Willfire HC, LLC	Assignment of Assignor's Interest
Oct 15, 2013 Reel 31407, frame 460	Willfire HC, LLC	Tyco Fire & Security GmbH	Assignment of Assignor's Interest
Sep 27, 2018 Reel 47158, frame 767	Tyco Fire & Security GmbH	Tyco Fire Products LP	Assignment of Assignor's Interest

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.

Free plan: 3 watched companies. Pro: unlimited.

Alerts on its grants, lapses and transfers.

What's changing

Sep 2028

Term ends no later than Sep 6, 2028. No further fees fall due before then

Note

A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed

Note

The 1479 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Open question

A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Sep 6, 2028. We will not guess the cap.

Citations

later US patents cite this one

That is below the median of utility patents granted in 2016 in our data, the only group it is compared against. How we rank

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

This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. Related patents and pending applications may cover overlapping subject matter.

In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.

Extinguishing Flammable Liquid Fire in an Industrial Storage Tank