Term ends no later than Apr 28, 2031 · Medium confidence
20-year base term ends Oct 2, 2029
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Danfoss Power Electronics A/S
Filed Dec 3, 2013 as application 14/095,911 · Granted Aug 8, 2017
Base term plus 573 days of patent term adjustment (USPTO delay)
Today
2009
2031
Clock starts
Oct 2, 2009
Oct 2, 2009
Ends no later than
Apr 28, 2031
Apr 28, 2031
Granted
Aug 8, 2017
Aug 8, 2017
base term
patent term adjustment
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
573
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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.
4
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 573 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 2 of 3 maintenance fees are paid so far. 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.
| Step | Input | Date after this step | Confidence |
|---|---|---|---|
| Base term, 20 years from filing | Clock starts Oct 2, 2009, when application 12/572,774, the earliest non-provisional in its chain, was filed (this one was filed Dec 3, 2013) | Oct 2, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +573 days, USPTO patent term adjustment record | Apr 28, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | no later than Apr 28, 2031 | Medium confidence |
This family
| US 8,313,306 | In force Nov 2030 | Nov 2030 |
| US 8,602,743 | In force Oct 2029 | Oct 2029 |
| US 9,726,184 | this patent no later than Apr 2031 | no later than Apr 2031 |
| US 10,724,263 | In force Jul 2030 | Jul 2030 |
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 |
|---|---|---|---|
| Dec 6, 2019 Reel 51206, frame 733 | Stiles, Robert W., JR.; Berthelsen, Lars Hoffmann | Pentair Water Pool and S.p.A., Inc.; Danfoss Drives A/S | Assignment of Assignor's Interest |
| Dec 6, 2019 Reel 51219, frame 259 | Danfoss Drives A/S | Danfoss Power Electronics A/S | Change of Name |
| Dec 6, 2019 reel/frame not recorded | Stiles, Robert W., JR.; Berthelsen, Lars Hoffmann | Pentair Water Pool and S.p.A., Inc. | Assignment of Assignor's Interest |
| Dec 6, 2019 reel/frame not recorded | Stiles, Robert W., JR.; Berthelsen, Lars Hoffmann | Danfoss Drives A/S | 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
Apr 2031
Term ends no later than Apr 28, 2031. Maintenance fees still fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 573 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Apr 28, 2031. We will not guess the cap.
Citations
6
later US patents cite this one
That is above the median of utility patents granted in 2017 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.