Lapsed Sep 9, 2026 on the fee record · High confidence
20-year base term ends Jun 13, 2031
Third maintenance fee unpaid; grace period ended.
Held by TDK Corporation
Filed Nov 16, 2012 as application 13/678,715 · Granted Sep 9, 2014
Base term, 20 years from filing, plus 101 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 9, 2026
2011
2031
Clock starts
Jun 13, 2011
Jun 13, 2011
No longer in force
Sep 9, 2026
Sep 9, 2026
Granted
Sep 9, 2014
Sep 9, 2014
Term would have run to
Sep 22, 2031
Sep 22, 2031
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
101
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.
4
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 Sep 22, 2031: its 20-year base term plus 101 days of term adjustment for prosecution delay. 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 Jun 13, 2011, when application 13/159,011, the earliest non-provisional in its chain, was filed (this one was filed Nov 16, 2012) | Jun 13, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +101 days, USPTO patent term adjustment record | Sep 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 | 2 of 3 maintenance fees paid | lapsed Sep 9, 2026 | High confidence |
| Computed term end | The steps above, in order | Sep 9, 2026 | High confidence |
This family
| US 8,929,098 | In force May 2033 | May 2033 |
| US 8,830,700 | this patent Sep 2026 | Sep 2026 |
| US 8,830,701 | Lapsed on the fee record Sep 2026 | Sep 2026 |
| US 8,817,490 | Lapsed on the fee record Aug 2026 | Aug 2026 |
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 |
|---|---|---|---|
| Nov 16, 2012 Reel 29309, frame 878 | Takegami, Eiji | TDK Corporation | Assignment of Assignor's Interest |
| Jul 17, 2013 Reel 30820, frame 995 | TDK Corporation | TDK Corporation | Change of Address |
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
Note
The 101 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 2014 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.