Lapsed Sep 12, 2025 on the fee record · High confidence
20-year base term ends May 3, 2031
Second maintenance fee unpaid; grace period ended.
Held by Unirac, Inc.
Filed Jul 31, 2015 as application 14/814,585 · Granted Sep 12, 2017
Base term, 20 years from filing, plus 33 days of patent term adjustment (USPTO delay)
Today
Lapsed Sep 12, 2025
2011
2031
Clock starts
May 3, 2011
May 3, 2011
No longer in force
Sep 12, 2025
Sep 12, 2025
Granted
Sep 12, 2017
Sep 12, 2017
Term would have run to
Jun 5, 2031
Jun 5, 2031
base term
patent term adjustment
after the term ends
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
33
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 9,101,082, to Jun 5, 2031. The term already ends on or before that date, so the cap shortened nothing.
1 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.
Its term would have run to Jun 5, 2031: its 20-year base term plus 33 days of term 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. 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 Jul 31, 2015) | May 3, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +33 days, USPTO patent term adjustment record | Jun 5, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 9,101,082) | resolves to Jun 5, 2031, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 1 of 3 maintenance fees paid | lapsed Sep 12, 2025 | High confidence |
| Computed term end | The steps above, in order | Sep 12, 2025 | High confidence |
This family
| US 9,101,082 | In force Oct 2032 | Oct 2032 |
| US 9,763,360 | this patent 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 |
|---|---|---|---|
| Jul 31, 2015 Reel 36223, frame 817 | Dorenkamp, James | Azuray Technologies, Inc. | Assignment of Assignor's Interest |
| Jul 31, 2015 Reel 36223, frame 858 | Dorenkamp, James; Pruett, Henry F.; Naiknaware, Ravindranath | Azuray Technologies, Inc. | Assignment of Assignor's Interest |
| Jul 31, 2015 Reel 36223, frame 895 | Azuray Technologies, Inc. | Solarbridge Technologies, Inc. | Assignment of Assignor's Interest |
| Jul 31, 2015 Reel 36223, frame 930 | 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
Note
The 33 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 9,101,082, 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 2017 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.