Term ends Sep 8, 2031 · High confidence
20-year base term ends Jul 11, 2031
Held by Enphase Energy, Inc.
Filed Jul 11, 2011 as application 13/180,168 · Granted Dec 3, 2013
Base term plus 59 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Jul 11, 2011
Jul 11, 2011
Term ends
Sep 8, 2031
Sep 8, 2031
Granted
Dec 3, 2013
Dec 3, 2013
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
59
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.
7
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 59 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 Jul 11, 2011, when this application, 13/180,168, was filed | Jul 11, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +59 days, USPTO patent term adjustment record | Sep 8, 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Sep 8, 2031 | High confidence |
This family
| US 8,174,856 | In force Jul 2031 | Jul 2031 |
| US 8,193,788 | In force Jul 2031 | Jul 2031 |
| US 8,599,587 | this patent Sep 2031 | Sep 2031 |
| US 8,456,876 | In force Jul 2031 | Jul 2031 |
| US 8,461,813 | In force Jul 2031 | Jul 2031 |
| Application PCT/US2012/035544 | PCT application no patent term | no patent term |
| US 9,263,183 | In force Jul 2031 | Jul 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 |
|---|---|---|---|
| May 7, 2012 Reel 28164, frame 288 | Chapman, Patrick; Van Dell, William R | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Sep 2, 2014 Reel 33677, frame 870 | Solarbridge Technologies, Inc. | Silicon Valley Bank | Security Interest |
| Dec 19, 2014 Reel 34681, frame 475 | Silicon Valley Bank | Solarbridge Technologies, Inc. | Release of Security Interest |
| Dec 19, 2014 Reel 34687, frame 232 | Solarbridge Technologies, Inc. | Sunpower Corporation | Assignment of Assignor's Interest |
| Sep 10, 2018 Reel 46964, frame 203 | Sunpower Corporation | Enphase Energy, Inc. | 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 2031
Term ends Sep 8, 2031. No further fees fall due before then
Note
The 59 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
29
later US patents cite this one
That is top 25% 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.