Term ends May 23, 2032 · High confidence
20-year base term ends Oct 22, 2029
Held by Fuji Electric Co., Ltd.
Filed Oct 22, 2009 as application 12/588,625 · Granted Jul 23, 2013
Base term plus 944 days of patent term adjustment (USPTO delay)
Today
2009
2032
Clock starts
Oct 22, 2009
Oct 22, 2009
Term ends
May 23, 2032
May 23, 2032
Granted
Jul 23, 2013
Jul 23, 2013
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
944
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
5
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 944 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 Oct 22, 2009, when this application, 12/588,625, was filed | Oct 22, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +944 days, USPTO patent term adjustment record | May 23, 2032 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 23, 2032 | High confidence |
This family
| US 8,493,696 | this patent May 2032 | May 2032 |
| US 8,330,295 | In force Apr 2031 | Apr 2031 |
| US 8,369,056 | Lapsed on the fee record Feb 2021 | Feb 2021 |
| US 8,461,807 | Lapsed on the fee record Jun 2021 | Jun 2021 |
| US 8,604,797 | Lapsed on the fee record Dec 2025 | Dec 2025 |
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 |
|---|---|---|---|
| Oct 22, 2009 Reel 23434, frame 497 | Komatsuzaki, Yoshihiro | TDK-Lambda Corporation | Assignment of Assignor's Interest |
| May 27, 2010 Reel 24469, frame 632 | TDK-Lambda Corporation | Fuji Electric Systems Co., Ltd. | Assignment of Assignor's Interest |
| Aug 26, 2011 Reel 26970, frame 872 | Fuji Electric Systems Co., Ltd. (Fes); Fuji Technosurvey Co., Ltd. (Merger by Absorption) | Fuji Electric Co., Ltd. | Merger and Change of Name |
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
May 2032
Term ends May 23, 2032. No further fees fall due before then
Note
The 944 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
14
later US patents cite this one
That is above the median of utility patents granted in 2013 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.