Term ends Apr 27, 2036 · High confidence
20-year base term ends Apr 27, 2036
Held by Ilsco, LLC
Filed Apr 27, 2016 as application 15/139,416 · Granted Mar 27, 2018
Base term, 20 years from filing
Today
2016
2036
Clock starts
Apr 27, 2016
Apr 27, 2016
Term ends
Apr 27, 2036
Apr 27, 2036
Granted
Mar 27, 2018
Mar 27, 2018
base term
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
None
Term adjustment
No prosecution delay on this record.
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.
This patent's term is its 20-year base term, with no adjustment for 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 Apr 27, 2016, when this application, 15/139,416, was filed | Apr 27, 2036 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | None on file | no change | 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 27, 2036 | 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 |
|---|---|---|---|
| Apr 27, 2016 Reel 38390, frame 773 | Beiler, Michael W.; Besterman, Eric D.; Jackson, Stephen M.; Merritt, Alan; Reed, Philip G.; Shank, Richard L.; Sweeney, Thomas M.; Taylor, Carl J. | Ilsco Corporation | Assignment of Assignor's Interest |
| Apr 27, 2020 Reel 52503, frame 956 | Ilsco Corporation | Ilsco, LLC | Change of Name |
| Apr 30, 2020 Reel 52542, frame 286 | Ilsco, LLC; Surge Suppression, LLC | Antares Capital LP, as Agent | Security Interest |
| Aug 4, 2023 Reel 64493, frame 847 | Ilsco, LLC; Surge Suppression, LLC | Antares Capital LP, as Agent | Release of Security Interest |
| Aug 25, 2023 reel/frame not recorded | Antares Capital LP, as Agent | Ilsco, LLC | Corrective Assignment to Correct the Conveying Party Data and Receiving Party Data Previously Recorded on Reel 064493 Frame 0847. Assignor(S) Hereby Confirms the Release of Security Interest. |
| Aug 25, 2023 reel/frame not recorded | Antares Capital LP, as Agent | Surge Suppression, LLC | Corrective Assignment to Correct the Conveying Party Data and Receiving Party Data Previously Recorded on Reel 064493 Frame 0847. Assignor(S) Hereby Confirms the Release of Security Interest. |
| Aug 25, 2023 Reel 64718, frame 639 | Antares Capital LP, as Agent | Ilsco, LLC; Surge Suppression, LLC | Corrective Assignment to Correct the Conveying Party Data and Receiving Party Data Previously Recorded on Reel 064493 Frame 0847. Assignor(S) Hereby Confirms the 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
Apr 2036
Term ends Apr 27, 2036. Maintenance fees still fall due before then
Citations
9
later US patents cite this one
That is above the median of utility patents granted in 2018 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.