Term ends May 3, 2031 · High confidence
20-year base term ends May 3, 2031
Held by Unirac, Inc.
Filed Aug 22, 2017 as application 15/682,708 · Granted Jun 9, 2020
Base term, 20 years from filing
Today
2011
2031
Clock starts
May 3, 2011
May 3, 2011
Term ends
May 3, 2031
May 3, 2031
Granted
Jun 9, 2020
Jun 9, 2020
base term
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
None
Term adjustment
No prosecution delay on this record.
None
Terminal disclaimer
No disclaimer on this record.
1 of 2
Maintenance fees paid
Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. 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 is its 20-year base term, with no adjustment for prosecution delay. 1 of 2 maintenance fees is 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 application 13/100,243, the earliest non-provisional in its chain, was filed (this one was filed Aug 22, 2017) | May 3, 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 | None on record | no cap applied | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 2 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | May 3, 2031 | High confidence |
This family
| US 9,101,082 | In force Oct 2032 | Oct 2032 |
| US 9,763,360 | Lapsed on the fee record Sep 2025 | Sep 2025 |
| US 10,681,829 | this patent 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 |
|---|---|---|---|
| Aug 22, 2017 Reel 43352, frame 558 | Dorenkamp, James; Pruett, Henry F.; Naiknaware, Ravindranath | Azuray Technologies, Inc. | Assignment of Assignor's Interest |
| Aug 22, 2017 Reel 43352, frame 730 | Azuray Technologies, Inc. | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Aug 22, 2017 Reel 43352, frame 769 | 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
May 2031
Term ends May 3, 2031. Maintenance fees still fall due before then
Citations
4
later US patents cite this one
That is above the median of utility patents granted in 2020 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.