Lapsed Apr 11, 2021 on the fee record · High confidence
20-year base term ends Oct 21, 2033
First maintenance fee unpaid; grace period ended.
Held by West Corporation
Filed Sep 22, 2015 as application 14/861,435 · Granted Apr 11, 2017
Base term, 20 years from filing
Today
Lapsed Apr 11, 2021
2013
2033
Clock starts
Oct 21, 2013
Oct 21, 2013
No longer in force
Apr 11, 2021
Apr 11, 2021
Granted
Apr 11, 2017
Apr 11, 2017
Term would have run to
Oct 21, 2033
Oct 21, 2033
base term
after the term ends
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.
No effect
Terminal disclaimer
Resolved from the filed document, referencing US 9,143,907, to Oct 21, 2033. The term already ends on or before that date, so the cap shortened nothing.
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.
4
Family applications on record here
Applications sharing this one's continuity chain whose file history this site holds. The family may have others.
Its term would have run to Oct 21, 2033: its 20-year base term, with no adjustment for prosecution delay. A terminal disclaimer is resolved from the filed document, and it ends no earlier than this term, so it shortens nothing. 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 Oct 21, 2013, when application 14/059,012, the earliest non-provisional in its chain, was filed (this one was filed Sep 22, 2015) | Oct 21, 2033 | 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 | Disclaimer resolved from the filed document (refs US 9,143,907) | resolves to Oct 21, 2033, no earlier than this term, so no change | High confidence |
| Patent term extension | None on file | no change | High confidence |
| Fee events | 0 of 3 maintenance fees paid | lapsed Apr 11, 2021 | High confidence |
| Computed term end | The steps above, in order | Apr 11, 2021 | High confidence |
This family
| US 9,143,907 | In force Oct 2033 | Oct 2033 |
| US 9,621,720 | this patent Apr 2021 | Apr 2021 |
| US 9,998,594 | In force Oct 2033 | Oct 2033 |
| US 10,367,937 | In force Oct 2033 | Oct 2033 |
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 |
|---|---|---|---|
| Oct 10, 2017 Reel 44166, frame 901 | West Corporation | Credit Suisse AG, Cayman Islands Branch, as Collateral Agent | Notice of Grant of Security Interest in Patents (First Lien) |
| Nov 25, 2024 Reel 69438, frame 775 | UBS AG, Stamford Branch (as Successor to Credit Suisse AG, Cayman Islands Branch in Its Capacity as Collateral Agent) | Wilmington Trust, National Association, as the Successor Collateral Agent | Omnibus Assignment of Security Interest in Intellectual Property |
| Oct 7, 2026 reel/frame not recorded | Wilmington Trust, National Association | West Corporation | Notice of Partial Release of Security Interest in Patents |
| Oct 7, 2026 reel/frame not recorded | Wilmington Trust, National Association | West Technology Group, LLC | Notice of Partial Release of Security Interest in Patents |
| Oct 7, 2026 Reel 76640, frame 108 | Wilmington Trust, National Association | West Corporation; West Technology Group, LLC | Notice of Partial Release of Security Interest in Patents |
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.
Terminal disclaimer
A terminal disclaimer resolved from the filed document, referencing US 9,143,907, ends no earlier than this term, so it caps nothing.
Citations
2
later US patents cite this one
That is below the median of utility patents granted in 2017 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.