Collateral for a security interest recorded Dec 5, 2022 (Fifth Third Bank, National Association).
Term ends Apr 14, 2033 · High confidence
20-year base term ends Nov 21, 2031
Held by Quantum Fuel Systems LLC
Filed Nov 3, 2015 as application 14/931,367 · Granted Jan 1, 2019
Base term plus 510 days of patent term adjustment (USPTO delay)
Today
2011
2033
Clock starts
Nov 21, 2011
Nov 21, 2011
Term ends
Apr 14, 2033
Apr 14, 2033
Granted
Jan 1, 2019
Jan 1, 2019
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
510
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 510 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 Nov 21, 2011, when application PCT/US2011/061695, the earliest non-provisional in its chain, was filed (this one was filed Nov 3, 2015) | Nov 21, 2031 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +510 days, USPTO patent term adjustment record | Apr 14, 2033 | 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 | Apr 14, 2033 | High confidence |
This family
| US 9,205,373 | In force Jun 2032 | Jun 2032 |
| US 10,168,002 | this patent Apr 2033 | Apr 2033 |
2 of 3 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 |
|---|---|---|---|
| Nov 11, 2015 Reel 37017, frame 378 | Leavitt, Mark | Quantum Fuel Systems Technologies Worldwide, Inc. | Assignment of Assignor's Interest |
| Nov 14, 2016 Reel 40309, frame 651 | Douglas Acquisitions LLC | Quantum Fuel Systems LLC | Assignment of Assignor's Interest |
| Dec 5, 2022 Reel 61968, frame 526 | Quantum Fuel Systems LLC | Fifth Third Bank, National Association | 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
Apr 2033
Term ends Apr 14, 2033. Maintenance fees still fall due before then
Note
The 510 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
6
later US patents cite this one
That is above the median of utility patents granted in 2019 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.