Collateral for a security interest recorded Mar 5, 2026 (Hercules Capital, Inc.).
Term ends Oct 14, 2041 · Medium confidence
20-year base term ends Oct 14, 2041
Why Medium: The disclaimer's references carry disclaimers of their own not yet read (US 12,107,886), so the cap could be lower.
Held by Expel, Inc.
Filed Aug 22, 2024 as application 18/812,602 · Granted Oct 20, 2026
Base term plus 50 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2021
2041
Clock starts
Oct 14, 2021
Oct 14, 2021
Term ends
Oct 14, 2041
Oct 14, 2041
Granted
Oct 20, 2026
Oct 20, 2026
base term
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
50
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
Capped
Terminal disclaimer
Resolved from the filed document, referencing US 11,310,270, US 11,509,689, US 12,107,886.
0 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.
8
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 50 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 0 of 3 maintenance fees are paid so far. Confidence: Medium. 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 Oct 14, 2021, when application 17/501,708, the earliest non-provisional in its chain, was filed (this one was filed Aug 22, 2024) | Oct 14, 2041 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +50 days, USPTO patent term adjustment record | Dec 3, 2041 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 11,310,270, US 11,509,689, US 12,107,886) | capped to Oct 14, 2041 | Medium confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | In force | High confidence |
| Computed term end | The steps above, in order | Oct 14, 2041 | Medium confidence |
This family
| US 11,310,270 | In force Oct 2041 | Oct 2041 |
| US 11,509,689 | In force Oct 2041 | Oct 2041 |
| US 12,107,886 | In force no later than Apr 2042 | no later than Apr 2042 |
| US 12,120,147 | In force Oct 2041 | Oct 2041 |
| US 12,771,721 | this patent Oct 2041 | Oct 2041 |
| US 12,388,870 | In force Oct 2041 | Oct 2041 |
| US 12,531,903 | In force Oct 2041 | Oct 2041 |
| Application 19/421,364 | Pending not computed | not computed |
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 |
|---|---|---|---|
| Aug 23, 2024 Reel 68378, frame 581 | Weber, Elisabeth; Silberman, Peter; Field, Shamus | Expel, Inc. | Assignment of Assignor's Interest |
| Mar 5, 2026 Reel 75041, frame 970 | Expel, Inc. | Hercules Capital, Inc. | Intellectual Property Security Agreement |
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
Oct 2041
Term ends Oct 14, 2041. Maintenance fees still fall due before then
Note
The 50 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Disclaimer cap
This term is capped by a terminal disclaimer resolved from the filed document, referencing US 11,310,270, US 11,509,689, US 12,107,886.
Citations
We have no citation count for this patent yet. That is not the same as never having been cited.
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.