Collateral for a security interest recorded May 7, 2026 (JPMorgan Chase Bank, N.A.).

Term ended Aug 9, 2026 · High confidence

Computed 20-year base term

Held by Chemtrac LLC

Filed Oct 21, 2005 as application 11/255,636 · Granted Dec 4, 2007

Base term plus 292 days of patent term adjustment (USPTO delay)

Today

20 years from filing

Term ended Aug 9, 2026

2005 2026

Clock starts
Oct 21, 2005

Term ended
Aug 9, 2026

Granted
Dec 4, 2007

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

292

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.

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 292 days past its 20-year base term on prosecution delay. All three maintenance fees were paid, so no fee lapse ended it. 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 21, 2005, when this application, 11/255,636, was filed	Oct 21, 2025	High confidence
Continuity chain	Every parent in the chain resolved	no change	High confidence
Patent term adjustment	+292 days, USPTO patent term adjustment record	Aug 9, 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	term ended	High confidence
Computed term end	The steps above, in order	Aug 9, 2026	High confidence

This family

US 7,303,685	this patent Aug 2026	Aug 2026
US 7,413,666	In force 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 29, 2010 Reel 25217, frame 313	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

Note

The 292 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us

Citations

later US patents cite this one

That is below the median of utility patents granted in 2007 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.

Polymer Control System