Term ended Jun 12, 2025 · High confidence
20-year base term ended Dec 21, 2024
Held by Evoqua Water Technologies LLC
Filed Mar 28, 2008 as application 12/058,177 · Granted Jan 11, 2011
Base term plus 173 days of patent term adjustment (USPTO delay)
Today
Term ended Jun 12, 2025
2004
2026
Clock starts
Dec 21, 2004
Dec 21, 2004
Term ended
Jun 12, 2025
Jun 12, 2025
Granted
Jan 11, 2011
Jan 11, 2011
base term
patent term adjustment
after the term ends
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
173
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.
5
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 173 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 Dec 21, 2004, when application 11/018,421, the earliest non-provisional in its chain, was filed (this one was filed Mar 28, 2008) | Dec 21, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +173 days, USPTO patent term adjustment record | Jun 12, 2025 | 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 | Jun 12, 2025 | High confidence |
This family
| US 7,604,725 | In force Apr 2027 | Apr 2027 |
| US 7,390,399 | Lapsed on the fee record Jun 2016 | Jun 2016 |
| US 7,488,423 | Term ended Dec 2025 | Dec 2025 |
| Application PCT/US2006/026336 | PCT application no patent term | no patent term |
| US 7,867,401 | this patent Jun 2025 | Jun 2025 |
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 15, 2011 Reel 26138, frame 593 | Siemens Water Technologies Holding Corp. | Siemens Industry, Inc. | Merger |
| Jan 1, 2014 Reel 31896, frame 256 | Siemens Industry, Inc. | Siemens Water Technologies LLC | Assignment of Assignor's Interest |
| Jan 24, 2014 Reel 32126, frame 430 | WTG Holdings III Corp.; WTG Holdings II Corp.; Siemens Treated Water Outsourcing Corp.; Siemens Water Technologies LLC | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Intellectual Property Security Agreement (Second Lien) |
| Jan 24, 2014 Reel 32126, frame 487 | WTG Holdings III Corp.; WTG Holdings II Corp.; Siemens Treated Water Outsourcing Corp.; Siemens Water Technologies LLC | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Intellectual Property Security Agreement (First Lien) |
| Feb 7, 2014 Reel 32174, frame 282 | Siemens Water Technologies LLC | Evoqua Water Technologies LLC | Change of Name |
| Apr 6, 2021 Reel 55845, frame 245 | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Siemens Water Technologies LLC | Release of Security Interest (Reel/Frame 032126/0487) |
| Apr 6, 2021 Reel 55845, frame 311 | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Siemens Water Technologies LLC | Release of Security Interest (Reel/Frame 032126/0430) |
| Apr 7, 2021 Reel 55848, frame 689 | Evoqua Water Technologies LLC; Neptune Benson, Inc. | JPMorgan Chase Bank, N.A., as Collateral Agent | Security Interest |
| May 26, 2023 Reel 63787, frame 943 | JPMorgan Chase Bank N.A., as Collateral Agent | Evoqua Water Technologies LLC; Neptune Benson, Inc. | Release of Security Interest |
| May 26, 2023 reel/frame not recorded | JPMorgan Chase Bank N.A., as Collateral Agent | Evoqua Water Technologies LLC | Release of Security Interest |
| May 26, 2023 reel/frame not recorded | JPMorgan Chase Bank N.A., as Collateral Agent | Neptune Benson, Inc. | 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
Note
The 173 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
34
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.