Term ends no later than Jun 1, 2031 · Medium confidence
20-year base term ends Mar 5, 2031
In force on USPTO's status record and by its fee record. A terminal disclaimer on file may shorten this term, possibly to a date already past; its reference document is unresolved, so the date above is an upper bound and no earlier date is guessed.
Held by Flexgen Power Systems, LLC
Filed Dec 8, 2015 as application 14/962,491 · Granted Dec 19, 2017
Base term plus 88 days of patent term adjustment (USPTO delay)
Today
2011
2031
Clock starts
Mar 5, 2011
Mar 5, 2011
Ends no later than
Jun 1, 2031
Jun 1, 2031
Granted
Dec 19, 2017
Dec 19, 2017
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
88
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Unresolved
Terminal disclaimer
On file, reference document not resolved, so the date above is an upper bound. We do not guess the cap.
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 88 days past its 20-year base term on prosecution delay. A terminal disclaimer is on file with no resolved reference, so no cap is applied and none is guessed. 2 of 3 maintenance fees are paid so far. Confidence: Medium. 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 Mar 5, 2011, when application PCT/CN2011/071548, the earliest non-provisional in its chain, was filed (this one was filed Dec 8, 2015) | Mar 5, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +88 days, USPTO patent term adjustment record | Jun 1, 2031 | High confidence |
| Terminal disclaimer cap | Disclaimer on file (approved), reference document not resolved | no cap applied, and none guessed | Medium 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 | no later than Jun 1, 2031 | Medium confidence |
This family
| US 9,331,497 | In force Aug 2031 | Aug 2031 |
| US 9,847,654 | this patent no later than Jun 2031 | no later than Jun 2031 |
| US 10,536,007 | In force Apr 2031 | Apr 2031 |
3 of 4 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| Jan 27, 2016 Reel 37594, frame 423 | Beaston, Virgil Lee | Powin Energy Corporation | Assignment of Assignor's Interest |
| Oct 28, 2019 Reel 50840, frame 901 | Powin Energy Corporation | Arroyo Energy Investment Partners LLC | Security Interest |
| Oct 30, 2019 reel/frame not recorded | Powin Energy Corporation | Powin Energy Finance LLC | Security Interest |
| Oct 30, 2019 reel/frame not recorded | Powin Energy Corporation | Arroyo Energy Investment Partners LLC | Security Interest |
| Oct 30, 2019 Reel 50926, frame 48 | Powin Energy Corporation | Powin Energy Finance LLC; Arroyo Energy Investment Partners LLC | Security Interest |
| Apr 23, 2021 Reel 56024, frame 524 | Powin Energy Corporation | Powin, LLC | Assignment of Assignor's Interest |
| Jan 3, 2022 Reel 58524, frame 848 | Powin, LLC | HSBC Bank USA, N.A., as Administrative Agent | Security Interest |
| Jan 13, 2022 Reel 58652, frame 252 | Arroyo Energy Investment Partners LLC | Powin Energy Corporation | Release of Security Interest |
| Oct 23, 2023 Reel 65310, frame 290 | HSBC Bank USA, N.A., as Administrative Agent | Powin, LLC | Release of Security Interest |
| Oct 2, 2024 Reel 69102, frame 539 | Powin, LLC | Glas USA LLC, as Collateral Agent | Notice of Security Interest in Intellectual Property |
| Sep 24, 2025 Reel 72946, frame 629 | Powin, LLC | Flexgen Power Systems, LLC | Assignment of Assignor's Interest |
| Oct 10, 2025 Reel 72535, frame 800 | Powin, LLC, et Al, Debtors, via U.S. Bankruptcy Court, District of New Jersey | Flexgen Power Systems, LLC | Release of Security 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.
Free plan: 3 watched companies. Pro: unlimited.
Alerts on its grants, lapses and transfers.
What's changing
Jun 2031
Term ends no later than Jun 1, 2031. Maintenance fees still fall due before then
Note
A terminal disclaimer is on file and its reference is not resolved. No cap is applied and none is guessed
Note
The 88 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Open question
A terminal disclaimer is on file (approved) and its reference document is not resolved. A disclaimer would cap the term earlier than Jun 1, 2031. We will not guess the cap.
Citations
98
later US patents cite this one
That is top 5% 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
This computed term ends no later than the date shown; an unresolved terminal disclaimer may end it earlier. 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.