Term ends Dec 14, 2039 · High confidence
20-year base term ends Sep 19, 2039
Held by Hydra-Stop LLC
Filed Sep 19, 2019 as application 16/576,344 · Granted Feb 15, 2022
Base term plus 86 days of patent term adjustment (USPTO delay)
Today
2019
2039
Clock starts
Sep 19, 2019
Sep 19, 2019
Term ends
Dec 14, 2039
Dec 14, 2039
Granted
Feb 15, 2022
Feb 15, 2022
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
86
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
This patent's term runs 86 days past its 20-year base term on prosecution delay. 1 of 3 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 Sep 19, 2019, when this application, 16/576,344, was filed | Sep 19, 2039 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +86 days, USPTO patent term adjustment record | Dec 14, 2039 | 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 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Dec 14, 2039 | 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 |
|---|---|---|---|
| Dec 6, 2019 Reel 51201, frame 531 | Vazzana, Christopher C.; Nelson, Andrew J. | Hydra-Stop LLC | Assignment of Assignor's Interest |
| Oct 5, 2022 Reel 61320, frame 963 | Hydra-Stop LLC | Cibc Bank USA | Security Interest |
| Jul 21, 2023 Reel 64344, frame 528 | Cibc Bank USA | Hydra-Stop LLC | Release of Security Interest |
| Jul 24, 2023 Reel 64354, frame 386 | Hydra-Stop LLC | Wells Fargo Bank, National Association, as Administrative Agent | Security Interest |
| Oct 3, 2024 Reel 69107, frame 331 | E.J. Brooks Company; Hydra-Stop LLC; Task Force Tips LLC; Reelcraft Industries, Inc.; Innovative Rescue Systems LLC | Wells Fargo Bank, National Association, as Collateral Agent | Patent Security Agreement |
| Oct 3, 2024 Reel 69107, frame 370 | Wells Fargo Bank, National Association, as Administrative Agent | Hydra-Stop LLC | Notice of Release of Security Interest in Patents Recorded on July 24, 2023, at Reel/Frame 064354/0386 |
| Sep 29, 2025 Reel 72978, frame 344 | Wells Fargo Bank, National Association, as Collateral Agent | Hydra-Stop LLC | First Lien Partial Release of Security Interest in Patents, Recorded on October 3, 2024 at Reel 069107 Frame 0331 |
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
Dec 2039
Term ends Dec 14, 2039. Maintenance fees still fall due before then
Note
The 86 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
2
later US patents cite this one
That is above the median of utility patents granted in 2022 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.