Collateral for a security interest recorded Dec 9, 2024 (Windsail Capital Fund, L.P.).
Term ends Feb 22, 2027 · High confidence
20-year base term ended Nov 28, 2025
Held by Fastcap Ultracapacitors LLC
Filed Nov 28, 2005 as application 11/164,510 · Granted Dec 23, 2008
Base term plus 451 days of patent term adjustment (USPTO delay)
Today
2005
2027
Clock starts
Nov 28, 2005
Nov 28, 2005
Term ends
Feb 22, 2027
Feb 22, 2027
Granted
Dec 23, 2008
Dec 23, 2008
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
451
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
3 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.
This patent's term runs 451 days past its 20-year base term on prosecution delay. All three maintenance fees are recorded paid; no more fees are due. 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 28, 2005, when this application, 11/164,510, was filed | Nov 28, 2025 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +451 days, USPTO patent term adjustment record | Feb 22, 2027 | 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 | 3 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Feb 22, 2027 | High confidence |
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 |
|---|---|---|---|
| Feb 17, 2011 Reel 25826, frame 827 | Feluch, Paul | Positive Direction, Inc. | Assignment of Assignor's Interest |
| Feb 17, 2011 Reel 25828, frame 540 | Positive Direction, Inc. | Calmena Energy Services Operating Corporation | Merger |
| May 14, 2013 Reel 30416, frame 373 | Calmena Energy Services Operating Corporation | Calmena Energy Services Inc. | Merger |
| May 8, 2014 Reel 32851, frame 185 | Calmena Energy Services Inc. | Fastcap Exploration Technologies, Inc. | Assignment of Assignor's Interest |
| May 9, 2014 Reel 32863, frame 138 | Fastcap Exploration Technologies, Inc. | Windsail Credit Fund, L.P., as Administrative Agent | Security Interest |
| Apr 25, 2019 Reel 48997, frame 24 | Fastcap Exploration Technologies, Inc. | Fastcap Systems Corporation | Assignment of Assignor's Interest |
| Oct 18, 2022 Reel 62738, frame 152 | Fastcap Systems Corporation | Windsail Credit Fund, L.p. | Security Interest |
| Dec 4, 2024 Reel 69495, frame 394 | Fastcap Systems Corporation | Fastcap Ultracapacitors LLC | Change of Name |
| Dec 4, 2024 Reel 70946, frame 799 | Windsail Capital Fund, L.p. | Fastcap Systems Corporation; BR Chrom LLC | Termination of Security Agreement |
| Dec 4, 2024 reel/frame not recorded | Windsail Capital Fund, L.p. | Fastcap Systems Corporation | Termination of Security Agreement |
| Dec 4, 2024 reel/frame not recorded | Windsail Capital Fund, L.p. | BR Chrom LLC | Termination of Security Agreement |
| Dec 9, 2024 Reel 69547, frame 440 | Fastcap Ultracapacitors LLC | Windsail Capital Fund, L.p. | 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
Feb 2027
Term ends Feb 22, 2027. No further fees fall due before then
Note
The 451 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
70
later US patents cite this one
That is top 10% of utility patents granted in 2008 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.