Term ends Jul 11, 2031 · High confidence
20-year base term ends Jul 11, 2031
Held by Enphase Energy, Inc.
Filed Dec 2, 2011 as application 13/309,909 · Granted Jun 4, 2013
Base term, 20 years from filing
Today
2011
2031
Clock starts
Jul 11, 2011
Jul 11, 2011
Term ends
Jul 11, 2031
Jul 11, 2031
Granted
Jun 4, 2013
Jun 4, 2013
base term
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
None
Term adjustment
No prosecution delay on this record.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 8,174,856, to Jul 11, 2031. The term already ends on or before that date, so the cap shortened nothing.
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 is its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 application 13/180,170, the earliest non-provisional in its chain, was filed (this one was filed Dec 2, 2011) | Jul 11, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,174,856) | resolves to Jul 11, 2031, no earlier than this term, so no change | 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 | Jul 11, 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 | In force Sep 2031 | Sep 2031 |
| US 8,456,876 | this patent 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 |
|---|---|---|---|
| Jan 24, 2013 Reel 29689, frame 358 | Chapman, Patrick | 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
Jul 2031
Term ends Jul 11, 2031. No further fees fall due before then
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 8,174,856, ends no earlier than this term, so it caps nothing.
Citations
22
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.