Term ends May 29, 2028 · High confidence
20-year base term ends May 29, 2028
Filed Nov 17, 2011 as application 13/298,575 · Granted Feb 12, 2013
Base term, 20 years from filing
Today
2008
2028
Clock starts
May 29, 2008
May 29, 2008
Term ends
May 29, 2028
May 29, 2028
Granted
Feb 12, 2013
Feb 12, 2013
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
10
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 is its 20-year base term, with no adjustment for 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 May 29, 2008, when application PCT/US2008/006799, the earliest non-provisional in its chain, was filed (this one was filed Nov 17, 2011) | May 29, 2028 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 | May 29, 2028 | High confidence |
This family
| Application 12/792,307 | Abandoned not computed | not computed |
| US 8,287,743 | In force May 2028 | May 2028 |
| US 8,622,222 | In force May 2028 | May 2028 |
| US 8,372,276 | this patent May 2028 | May 2028 |
| Application 13/396,275 | Abandoned not computed | not computed |
| US 8,840,783 | In force Jul 2028 | Jul 2028 |
| US 9,573,824 | In force May 2028 | May 2028 |
| US 10,507,431 | In force May 2029 | May 2029 |
8 of 10 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| 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) |
| Oct 16, 2026 Reel 76718, frame 189 | Dupont Specialty Materials Singapore Pte. Ltd. | Filmtec Water Singapore Pte. Ltd. | Assignment of Assignor's 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.
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Alerts on its grants, lapses and transfers.
What's changing
May 2028
Term ends May 29, 2028. No further fees fall due before then
Citations
16
later US patents cite this one
That is above the median of utility patents granted in 2013 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.