The Patent Finder
US

Membrane Cleaning with Pulsed Airlift Pump

US 8,622,222 In force
OverviewFamilyAssignmentsSources & methods

Term ends May 29, 2028 · High confidence

Filed Jan 6, 2011 as application 12/602,316 · Granted Jan 7, 2014
Base term plus 556 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
20 years from filing
2008 2028
Clock starts
May 29, 2008
Term ends
May 29, 2028
Granted
Jan 7, 2014
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
556
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 8,287,743.
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 runs 556 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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.
StepInputDate after this stepConfidence
Base term, 20 years from filingClock starts May 29, 2008, when application PCT/US2008/006799, the earliest non-provisional in its chain, was filed (this one was filed Jan 6, 2011)May 29, 2028High confidence
Continuity chainEvery parent in the chain resolvedno changeHigh confidence
Patent term adjustment+556 days, USPTO patent term adjustment recordDec 6, 2029High confidence
Terminal disclaimer capDisclaimer resolved from the filed document (refs US 8,287,743)capped to May 29, 2028High confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events3 of 3 maintenance fees paidIn forceHigh confidence
Computed term endThe steps above, in orderMay 29, 2028High confidence

This family

Application 12/792,307Abandoned
not computed
not computed
US 8,287,743In force
May 2028
May 2028
US 8,622,222this patent
May 2028
May 2028
US 8,372,276In force
May 2028
May 2028
Application 13/396,275Abandoned
not computed
not computed
US 8,840,783In force
Jul 2028
Jul 2028
US 9,573,824In force
May 2028
May 2028
US 10,507,431In 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.
RecordedAssignorAssigneeConveyance
Sep 29, 2010
Reel 25063, frame 735
James, Gerin; Zuback, Joseph Edward; Zauner, Peter; Phelps, Roger WilliamSiemens Water Technologies Corp.Assignment of Assignor's Interest
Dec 6, 2010
Reel 25457, frame 89
Zha, Fufang; James, Gerin; Zuback, Joseph Edward; Zauner, Peter; Phelps, Roger WilliamSiemens Water Technologies Corp.Assignment of Assignor's Interest
Apr 12, 2011
Reel 26111, frame 973
Siemens Water Technologies Corp.Siemens Water Technologies Holding Corp.Merger
Apr 15, 2011
Reel 26138, frame 605
Siemens Water Technologies Holding Corp.Siemens Industry, Inc.Merger
Sep 20, 2013
Reel 31249, frame 788
Siemens Industry, Inc.Siemens Water Technologies LLCAssignment 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 LLCCredit Suisse AG, Cayman Islands Branch, as Collateral AgentIntellectual 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 LLCCredit Suisse AG, Cayman Islands Branch, as Collateral AgentIntellectual Property Security Agreement (First Lien)
Feb 7, 2014
Reel 32174, frame 282
Siemens Water Technologies LLCEvoqua Water Technologies LLCChange of Name
Apr 6, 2021
Reel 55845, frame 245
Credit Suisse AG, Cayman Islands Branch, as Collateral AgentSiemens Water Technologies LLCRelease of Security Interest (Reel/Frame 032126/0487)
Apr 6, 2021
Reel 55845, frame 311
Credit Suisse AG, Cayman Islands Branch, as Collateral AgentSiemens Water Technologies LLCRelease 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.

The Patent Finder CompaniesExpirationsCalculatorWatchlistPricing MethodologyCorrectionsLegalPrivacysupport@thepatentfinder.com Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited