Lapsed Jun 24, 2016 on the fee record · High confidence
20-year base term ended Dec 21, 2024
Second maintenance fee unpaid; grace period ended.
Held by Evoqua Water Technologies LLC
Filed Dec 21, 2004 as application 11/018,421 · Granted Jun 24, 2008
Base term, 20 years from filing, plus 484 days of patent term adjustment (USPTO delay)
Today
Lapsed Jun 24, 2016
2004
2026
Clock starts
Dec 21, 2004
Dec 21, 2004
No longer in force
Jun 24, 2016
Jun 24, 2016
Granted
Jun 24, 2008
Jun 24, 2008
Term would have run to
Apr 19, 2026
Apr 19, 2026
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
484
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
1 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.
Its term would have run to Apr 19, 2026: its 20-year base term plus 484 days of term adjustment for prosecution delay. 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 this application, 11/018,421, was filed | Dec 21, 2024 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +484 days, USPTO patent term adjustment record | Apr 19, 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 | 1 of 3 maintenance fees paid | lapsed Jun 24, 2016 | High confidence |
| Computed term end | The steps above, in order | Jun 24, 2016 | High confidence |
This family
| US 7,604,725 | In force Apr 2027 | Apr 2027 |
| US 7,390,399 | this patent 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 | Term ended 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 |
|---|---|---|---|
| Feb 11, 2005 Reel 15710, frame 173 | Dennis, Richard; Rhodes, Jeffrey; Thomas, Edward; Marcukaitis, James | Usfilter Corporation | Assignment of Assignor's Interest |
| Oct 20, 2006 Reel 18418, frame 212 | Usfilter Corporation | Siemens Water Technologies Holding Corp. | Change of Name |
| 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) |
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 484 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
64
later US patents cite this one
That is top 25% 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.