Term ends Nov 9, 2029 · High confidence
20-year base term ends Sep 21, 2029
Held by Gridscale Solutions, LLC
Filed Jul 8, 2013 as application 13/936,744 · Granted Dec 29, 2015
Base term plus 49 days of patent term adjustment (USPTO delay)
Today
2009
2029
Clock starts
Sep 21, 2009
Sep 21, 2009
Term ends
Nov 9, 2029
Nov 9, 2029
Granted
Dec 29, 2015
Dec 29, 2015
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
49
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 8,482,947, to Nov 9, 2029. 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.
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 49 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: 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 application 12/563,495, the earliest non-provisional in its chain, was filed (this one was filed Jul 8, 2013) | Sep 21, 2029 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +49 days, USPTO patent term adjustment record | Nov 9, 2029 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 8,482,947) | resolves to Nov 9, 2029, 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 | Nov 9, 2029 | High confidence |
This family
| US 8,482,947 | In force Dec 2031 | Dec 2031 |
| Application PCT/US2010/041161 | PCT application no patent term | no patent term |
| US 9,225,256 | this patent 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 |
|---|---|---|---|
| Dec 19, 2014 Reel 34687, frame 232 | Solarbridge Technologies, Inc. | Sunpower Corporation | Assignment of Assignor's Interest |
| Aug 24, 2017 Reel 43384, frame 549 | Chapman, Patrick L.; Balog, Robert S.; Kimball, Jonathan W.; Krein, Philip T.; Gray, Alexander; Esram, Trishan; Kuhn, Brian T. | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Aug 24, 2017 Reel 43384, frame 584 | 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
Nov 2029
Term ends Nov 9, 2029. Maintenance fees still fall due before then
Note
The 49 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 8,482,947, ends no earlier than this term, so it caps nothing.
Citations
20
later US patents cite this one
That is top 25% of utility patents granted in 2015 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.