Also listed on Desa IP, LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded Dec 23, 2021 (The Toronto-Dominion Bank).
Term ends Nov 18, 2026 · High confidence
20-year base term ended Oct 18, 2026
Held by Heathco LLC
Filed Oct 18, 2006 as application 11/550,564 · Granted Oct 11, 2011
Base term plus 31 days of patent term adjustment (USPTO delay)
Today
2006
2026
Clock starts
Oct 18, 2006
Oct 18, 2006
Term ends
Nov 18, 2026
Nov 18, 2026
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
31
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 31 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 Oct 18, 2006, when this application, 11/550,564, was filed | Oct 18, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +31 days, USPTO patent term adjustment record | Nov 18, 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Nov 18, 2026 | 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 |
|---|---|---|---|
| Nov 6, 2006 Reel 18483, frame 685 | Raper, William C | Desa IP, LLC | Assignment of Assignor's Interest |
| Oct 25, 2007 Reel 20010, frame 766 | Desa IP, LLC | Heathco LLC | Assignment of Assignor's Interest |
| Jan 11, 2016 Reel 37484, frame 127 | Heathco LLC | LBC Credit Partners III, L.P., as Agent | Security Interest |
| Feb 4, 2016 Reel 37693, frame 533 | Heathco LLC | Wells Fargo Bank, National Association | Patent Security Agreement |
| Oct 28, 2020 Reel 55349, frame 140 | LBC Credit Partners III, L.P., as Agent | Heathco LLC | Release of Security Interest |
| Oct 28, 2021 Reel 57946, frame 154 | Wells Fargo Bank, National Association | Heathco LLC | Release of Security Interest |
| Dec 23, 2021 Reel 58980, frame 186 | Heathco LLC | The Toronto-Dominion Bank | Security Interest |
| Jul 25, 2024 Reel 68235, frame 742 | Globe Electric Company Inc.; Heathco LLC | Alter Domus (US) LLC | Assignment for Security – Patents and Industrial Designs |
| Jul 31, 2024 Reel 68235, frame 716 | Globe Electric Company Inc.; Heathco LLC | Bank Of America, N.a. | Assignment for Security - Patents and Industrial Designs |
| Aug 15, 2024 Reel 68654, frame 433 | Toronto-Dominion Bank | Globe Electric Company Inc.; Heathco, LLC | Release of Security Interest |
| Aug 15, 2024 reel/frame not recorded | Toronto-Dominion Bank | Globe Electric Company Inc. | Release of Security Interest |
| Aug 15, 2024 reel/frame not recorded | Toronto-Dominion Bank | Heathco, LLC | Release of Security 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
Nov 2026
Term ends Nov 18, 2026. No further fees fall due before then
Note
The 31 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
24
later US patents cite this one
That is top 25% 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.