Also listed on Willfire HC, LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Dec 13, 2028 · High confidence
20-year base term ended Feb 22, 2022
Held by Tyco Fire Products LP
Filed Feb 22, 2002 as application 10/081,419 · Granted Oct 11, 2011
Base term plus 2486 days of patent term adjustment (USPTO delay)
Today
2002
2028
Clock starts
Feb 22, 2002
Feb 22, 2002
Term ends
Dec 13, 2028
Dec 13, 2028
Granted
Oct 11, 2011
Oct 11, 2011
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
2,486
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
This patent's term runs 2486 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. Confidence: High. 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 Feb 22, 2002, when this application, 10/081,419, was filed | Feb 22, 2022 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +2486 days, USPTO patent term adjustment record | Dec 13, 2028 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 13, 2028 | High confidence |
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 |
|---|---|---|---|
| May 3, 2002 Reel 12879, frame 350 | Williams, Dwight P. | Williams Fire and Hazard Control, Inc. | Assignment of Assignor's Interest |
| Nov 3, 2011 Reel 27168, frame 118 | Williams Fire and Hazard Control, Inc. | Willfire HC, LLC | Assignment of Assignor's Interest |
| Oct 15, 2013 Reel 31406, frame 665 | 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
Dec 2028
Term ends Dec 13, 2028. No further fees fall due before then
Note
The 2486 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
0
later US patents cite this one
That is below the median of utility patents granted in 2011 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
Computed patent terms end on the dates shown. 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.