The Patent Finder
US

Priming Protection

US 8,469,675 Lapsed on the fee record
OverviewFamilyAssignmentsSources & methods

Lapsed Jun 25, 2025 on the fee record · Medium confidence

Why Medium: A parent in the chain could not be resolved.

Third maintenance fee unpaid; grace period ended.

Filed Dec 7, 2006 as application 11/608,001 · Granted Jun 25, 2013
Base term, 20 years from filing, plus 1147 days of patent term adjustment (USPTO delay)
Today
Lapsed Jun 25, 2025
2004 2027
Clock starts
Aug 26, 2004
No longer in force
Jun 25, 2025
Granted
Jun 25, 2013
Term would have run to
Oct 17, 2027
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
1,147
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
2 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.
41
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 Oct 17, 2027: its 20-year base term plus 1147 days of term adjustment for prosecution delay. Confidence: Medium. 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 Aug 26, 2004, when application 10/926,513, the earliest non-provisional in its chain, was filed (this one was filed Dec 7, 2006); a parent in its chain could not be resolved (the next row)Aug 26, 2024High confidence
Continuity chainA parent in the chain could not be resolveddated from this application's own claimMedium confidence
Patent term adjustment+1147 days, USPTO patent term adjustment recordOct 17, 2027High confidence
Terminal disclaimer capNone on recordno cap appliedHigh confidence
Patent term extensionNone on fileno changeHigh confidence
Fee events2 of 3 maintenance fees paidlapsed Jun 25, 2025High confidence
Computed term endThe steps above, in orderJun 25, 2025Medium confidence

This family

US 7,874,808Lapsed on the fee record
Jan 2023
Jan 2023
US 8,019,479In force
Nov 2028
Nov 2028
US 8,469,675this patent
Jun 2025
Jun 2025
US 8,480,373In force
Jun 2027
Jun 2027
US 7,854,597Lapsed on the fee record
Dec 2022
Dec 2022
US 7,686,589Term ended
Apr 2025
Apr 2025
US 7,845,913Term ended
Aug 2024
Aug 2024
US 8,602,745In force
Mar 2028
Mar 2028
8 of 41 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
Mar 12, 2007
Reel 19005, frame 709
Stiles, JR., Robert W.; Berthelsen, Lars Hoffmann; Kjaer, Gert; Lungeanu, FlorinPentair Water Pool and S.p.A., Inc.; Danfoss Low Power DrivesAssignment of Assignor's Interest
Mar 12, 2007
reel/frame not recorded
Stiles, JR., Robert W.; Berthelsen, Lars Hoffmann; Kjaer, Gert; Lungeanu, FlorinPentair Water Pool and S.p.A., Inc.Assignment of Assignor's Interest
Mar 12, 2007
reel/frame not recorded
Stiles, JR., Robert W.; Berthelsen, Lars Hoffmann; Kjaer, Gert; Lungeanu, FlorinDanfoss Low Power DrivesAssignment of Assignor's Interest
May 29, 2015
Reel 35796, frame 307
Danfoss Low Power Drives, a Division of Danfoss Drives A/SDanfoss Power Electronics A/SChange of Name
Dec 10, 2019
Reel 51240, frame 490
Stiles, Robert W.; Berthelsen, Lars Hoffmann; Robol, Ronald B.; Yahnker, Christopher; Cox, Everett; Steen, Donald; Murphy, Kevin; Woodcock, Walter J., JR.; Hruby, Daniel J.; Westermann-rasmussen, Peter; Kjaer, Gert; Runarsson, Einar Kjartan; Hansen, Arne Fink; Morando, Alberto; Lungeanu, Florin; Harvest, Nils-olePentair Water Pool and S.p.A., Inc.; Danfoss Drives A/SAssignment of Assignor's Interest
Dec 10, 2019
Reel 51240, frame 555
Danfoss Drives A/SDanfoss Power Electronics A/SChange of Name
Dec 10, 2019
reel/frame not recorded
Cox, Everett; Hruby, Daniel J.; Robol, Ronald B.; Steen, Donald; Stiles, Robert W.; Yahnker, Christopher; Woodcock, Walter J., JR.; Murphy, Kevin; Hansen, Arne Fink; Runarsson, Einar Kjartan; Westermann-rasmussen, Peter; Harvest, Nils-ole; Kjaer, Gert; Lungeanu, Florin; Morando, Alberto; Berthelsen, Lars HoffmannPentair Water Pool and S.p.A., Inc.Assignment of Assignor's Interest
Dec 10, 2019
reel/frame not recorded
Cox, Everett; Hruby, Daniel J.; Robol, Ronald B.; Steen, Donald; Stiles, Robert W.; Yahnker, Christopher; Woodcock, Walter J., JR.; Murphy, Kevin; Hansen, Arne Fink; Runarsson, Einar Kjartan; Westermann-rasmussen, Peter; Harvest, Nils-ole; Kjaer, Gert; Lungeanu, Florin; Morando, Alberto; Berthelsen, Lars HoffmannDanfoss Drives A/SAssignment 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 14, 2026 · includes USPTO assignment & status data published Nov 14, 2026 and grant & fee data published Nov 10, 2026 (weekly) Part of 137 Finder · © 2026 137 Finder LLC · Sources cited