Term ends Apr 27, 2038 · High confidence
20-year base term ends Dec 20, 2037
Held by Hydra-Stop LLC
Filed Dec 20, 2017 as application 15/848,158 · Granted Apr 14, 2020
Base term plus 128 days of patent term adjustment (USPTO delay)
Today
2017
2038
Clock starts
Dec 20, 2017
Dec 20, 2017
Term ends
Apr 27, 2038
Apr 27, 2038
Granted
Apr 14, 2020
Apr 14, 2020
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
128
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 128 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 Dec 20, 2017, when this application, 15/848,158, was filed | Dec 20, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +128 days, USPTO patent term adjustment record | Apr 27, 2038 | 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 | Apr 27, 2038 | 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 20, 2017 Reel 44446, frame 478 | Nelson, Andrew J.; Vazzana, Christopher C.; Mastny, Carl | Hydra-Stop LLC | Assignment of Assignor's Interest |
| Apr 7, 2022 Reel 59536, frame 101 | Hydra-Stop LLC | Cibc Bank USA | Security 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
Apr 2038
Term ends Apr 27, 2038. Maintenance fees still fall due before then
Note
The 128 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 below the median of utility patents granted in 2020 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.