Term ends Sep 13, 2032 · Medium confidence
20-year base term ends Nov 25, 2031
Why Medium: A parent in the chain could not be resolved.
Held by NHK Spring Co., Ltd.
Filed Nov 2, 2012 as application 13/667,512 · Granted Apr 30, 2019
Base term plus 293 days of patent term adjustment (USPTO delay)
Today
2011
2032
Clock starts
Nov 25, 2011
Nov 25, 2011
Term ends
Sep 13, 2032
Sep 13, 2032
Granted
Apr 30, 2019
Apr 30, 2019
base term
patent term adjustment
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
293
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 9,153,463, to Sep 13, 2032. The term already ends on or before that date, so the cap shortened nothing.
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.
8
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 293 days past its 20-year base term on prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 Nov 25, 2011, when application 13/304,493, the earliest non-provisional in its chain, was filed (this one was filed Nov 2, 2012); a parent in its chain could not be resolved (the next row) | Nov 25, 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 | +293 days, USPTO patent term adjustment record | Sep 13, 2032 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 9,153,463) | resolves to Sep 13, 2032, no earlier than this term, so no change | High 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 | Sep 13, 2032 | Medium confidence |
This family
| US 8,047,611 | Lapsed on the fee record Nov 2023 | Nov 2023 |
| US 7,851,728 | In force Jul 2028 | Jul 2028 |
| US 8,492,649 | Lapsed on the fee record Jul 2021 | Jul 2021 |
| US 8,267,356 | Lapsed on the fee record Sep 2020 | Sep 2020 |
| US 9,153,463 | In force Feb 2033 | Feb 2033 |
| US 10,276,410 | this patent Sep 2032 | Sep 2032 |
6 of 8 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.
| Recorded | Assignor | Assignee | Conveyance |
|---|---|---|---|
| Dec 19, 2012 Reel 29498, frame 863 | Tachikawa, Toshihiro; Miyahara, Junichi; Yonekura, Kazuhiro; Hanamachi, Toshihiko; Takahara, Go; Futakuchiya, Jun; Hashimoto, Daisuke | NHK Spring Co., 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Sep 2032
Term ends Sep 13, 2032. Maintenance fees still fall due before then
Note
The 293 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 9,153,463, ends no earlier than this term, so it caps nothing.
Citations
517
later US patents cite this one
That is top 1% 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.