Term ends Apr 22, 2031 · Medium confidence
20-year base term ends Mar 24, 2031
Why Medium: A parent in the chain could not be resolved.
Held by TDK-Lambda Corporation
Filed Nov 8, 2016 as application 15/346,484 · Granted Feb 26, 2019
Base term plus 29 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Mar 24, 2011
Mar 24, 2011
Term ends
Apr 22, 2031
Apr 22, 2031
Granted
Feb 26, 2019
Feb 26, 2019
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
29
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.
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 29 days past its 20-year base term on prosecution delay. 1 of 3 maintenance fees is 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 Mar 24, 2011, when application 13/070,959, the earliest non-provisional in its chain, was filed (this one was filed Nov 8, 2016); a parent in its chain could not be resolved (the next row) | Mar 24, 2031 | High confidence |
| Continuity chain | A parent in the chain could not be resolved | dated from this application's own claim | Medium confidence |
| Patent term adjustment | +29 days, USPTO patent term adjustment record | Apr 22, 2031 | 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 | In force | High confidence |
| Computed term end | The steps above, in order | Apr 22, 2031 | Medium confidence |
This family
| US 8,934,267 | In force Nov 2031 | Nov 2031 |
| US 9,143,047 | In force no later than Mar 2031 | no later than Mar 2031 |
| US 9,520,772 | In force Nov 2031 | Nov 2031 |
| US 10,218,265 | this patent Apr 2031 | Apr 2031 |
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 5, 2016 Reel 40529, frame 43 | He, Jin; Boylan, Jeffrey John | TDK-Lambda Corporation | 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Apr 2031
Term ends Apr 22, 2031.
Note
The 29 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2019 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.