Term ends Dec 15, 2031 · High confidence
20-year base term ends Sep 21, 2029
Held by Gridscale Solutions, LLC
Filed Sep 21, 2009 as application 12/563,495 · Granted Jul 9, 2013
Base term plus 815 days of patent term adjustment (USPTO delay)
Today
2009
2031
Clock starts
Sep 21, 2009
Sep 21, 2009
Term ends
Dec 15, 2031
Dec 15, 2031
Granted
Jul 9, 2013
Jul 9, 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
815
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.
4
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 815 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 Sep 21, 2009, when this application, 12/563,495, was filed | Sep 21, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +815 days, USPTO patent term adjustment record | Dec 15, 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 | Dec 15, 2031 | High confidence |
This family
| US 8,482,947 | this patent Dec 2031 | Dec 2031 |
| Application PCT/US2010/041161 | PCT application no patent term | no patent term |
| US 9,225,256 | In force Nov 2029 | Nov 2029 |
| US 9,806,628 | In force Sep 2029 | Sep 2029 |
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 |
|---|---|---|---|
| Mar 26, 2010 Reel 24145, frame 95 | Chapman, Patrick L., MR.; Kuhn, Brian T., MR.; Balog, Robert S., MR.; Kimball, Jonathan W., MR.; Krein, Philip T., MR.; Gray, Alexander, MR.; Esram, Trishan, MR. | 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 |
| Mar 25, 2026 Reel 74174, frame 532 | Enphase Energy, Inc. | Powerbridge Networks, LLC | Assignment of Assignor's Interest |
| Apr 21, 2026 Reel 74426, frame 830 | Powerbridge Networks, LLC | Gridscale Solutions, LLC | 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.
What's changing
Dec 2031
Term ends Dec 15, 2031. No further fees fall due before then
Note
The 815 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
88
later US patents cite this one
That is top 10% 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.