Also listed on North American Filtration Holdings LLC, an earlier holder on the record. The recorded assignments below show how it moved.
Collateral for a security interest recorded May 7, 2026 (JPMorgan Chase Bank, N.A.).
Term ends Mar 13, 2027 · High confidence
20-year base term ended Sep 18, 2026
Held by Chemtrac LLC
Filed Sep 18, 2006 as application 11/522,609 · Granted Aug 19, 2008
Base term plus 176 days of patent term adjustment (USPTO delay)
Today
2006
2027
Clock starts
Sep 18, 2006
Sep 18, 2006
Term ends
Mar 13, 2027
Mar 13, 2027
Granted
Aug 19, 2008
Aug 19, 2008
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
176
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.
3
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 176 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 Sep 18, 2006, when this application, 11/522,609, was filed | Sep 18, 2026 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +176 days, USPTO patent term adjustment record | Mar 13, 2027 | 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 | Mar 13, 2027 | High confidence |
This family
| US 7,303,685 | Term ended Aug 2026 | Aug 2026 |
| US 7,413,666 | this patent Mar 2027 | Mar 2027 |
| US 7,430,043 | In force Jun 2027 | Jun 2027 |
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 |
|---|---|---|---|
| Oct 30, 2010 Reel 25217, frame 663 | Bryant, Bob; Clark, John | Chemtrac Systems, Inc. | Assignment of Assignor's Interest |
| Apr 28, 2011 Reel 26191, frame 754 | Chemtrac Systems, Inc. | Chemtrac, Inc. | Assignment of Assignor's Interest |
| Apr 6, 2022 Reel 59509, frame 921 | North American Filtration Holdings LLC; Naf Water Filtration Enterprises LLC; Naf Water Solutions Enterprises LLC; Naf Aquatics Enterprises LLC; Naf Water Filtration LLC; Chemtrac LLC; Naf Aquatics LLC | Live Oak Banking Company | Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | North American Filtration Holdings LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Naf Water Filtration Enterprises LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Naf Aquatics Enterprises LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Naf Aquatics LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Chemtrac LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Naf Water Solutions Enterprises LLC | Release of Security Interest |
| Nov 3, 2025 reel/frame not recorded | Live Oak Banking Company | Naf Water Filtration LLC | Release of Security Interest |
| Nov 3, 2025 Reel 72760, frame 571 | Live Oak Banking Company | North American Filtration Holdings LLC; Naf Water Filtration Enterprises LLC; Naf Aquatics Enterprises LLC; Naf Aquatics LLC; Chemtrac LLC; Naf Water Solutions Enterprises LLC; Naf Water Filtration LLC | Release of Security Interest |
| Nov 26, 2025 Reel 73042, frame 38 | Chemtrac, Inc. | Naf Contrco LLC | Nunc Pro Tunc Assignment |
| Nov 26, 2025 Reel 73042, frame 288 | Naf Contrco LLC | North American Filtration Holdings LLC | Nunc Pro Tunc Assignment |
| Nov 26, 2025 Reel 73042, frame 585 | North American Filtration Holdings LLC | Naf Water Solutions Enterprises LLC | Nunc Pro Tunc Assignment |
| Nov 26, 2025 Reel 73042, frame 830 | Naf Water Solutions Enterprises LLC | Chemtrac LLC | Nunc Pro Tunc Assignment |
| May 7, 2026 Reel 74586, frame 152 | North American Filtration Holdings LLC; Naf Water Filtration Enterprises LLC; Naf Water Filtration LLC; Naf Water Solution Enterprises LLC; Chemtrac LLC; Naf Aquatics LLC | Jpmorgan Chase Bank, N.a. | 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
Mar 2027
Term ends Mar 13, 2027. No further fees fall due before then
Note
The 176 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
8
later US patents cite this one
That is below the median of utility patents granted in 2008 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.