Also listed on Azuray Technologies, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Oct 22, 2032 · High confidence
20-year base term ends May 3, 2031
Held by Unirac, Inc.
Filed May 3, 2011 as application 13/100,243 · Granted Aug 4, 2015
Base term plus 538 days of patent term adjustment (USPTO delay)
Today
2011
2032
Clock starts
May 3, 2011
May 3, 2011
Term ends
Oct 22, 2032
Oct 22, 2032
Granted
Aug 4, 2015
Aug 4, 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
538
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
3
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 538 days past its 20-year base term on prosecution delay. 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 May 3, 2011, when this application, 13/100,243, was filed | May 3, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +538 days, USPTO patent term adjustment record | Oct 22, 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 | 2 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Oct 22, 2032 | High confidence |
This family
| US 9,101,082 | this patent Oct 2032 | Oct 2032 |
| US 9,763,360 | Lapsed on the fee record Sep 2025 | Sep 2025 |
| US 10,681,829 | In force May 2031 | May 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 31, 2011 Reel 26364, frame 762 | Dorenkamp, James; Pruett, Henry F.; Naiknaware, Ravindranath | Azuray Technologies, Inc. | Assignment of Assignor's Interest |
| Feb 4, 2013 Reel 29871, frame 875 | Azuray Technologies, Inc. | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Feb 26, 2013 Reel 29881, frame 470 | Azuray Technologies, Inc. | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Dec 19, 2014 Reel 34687, frame 232 | Solarbridge Technologies, Inc. | Sunpower Corporation | Assignment of Assignor's Interest |
| Sep 13, 2022 Reel 61422, frame 566 | Sunpower Corporation | Bank of America, N.A., as Agent | Security Interest |
| Feb 14, 2024 Reel 66598, frame 964 | Sunpower Corporation | Glas Americas LLC, as Collateral Agent | Second Lien Patent Security Agreement |
| Apr 1, 2025 Reel 70704, frame 860 | Sunpower Corporation, | Unirac, Inc. | Release of Security Interest |
| May 16, 2025 Reel 71302, frame 904 | Sunpower Corporation; Sunpower Corporation, Systems | Unirac, 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.
What's changing
Oct 2032
Term ends Oct 22, 2032. Maintenance fees still fall due before then
Note
The 538 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
28
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.