Also listed on Nginx, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Jun 23, 2038 · High confidence
20-year base term ends Apr 24, 2038
Held by F5 Networks, Inc.
Filed Apr 24, 2018 as application 15/961,799 · Granted Dec 10, 2019
Base term plus 60 days of patent term adjustment (USPTO delay)
Today
2018
2038
Clock starts
Apr 24, 2018
Apr 24, 2018
Term ends
Jun 23, 2038
Jun 23, 2038
Granted
Dec 10, 2019
Dec 10, 2019
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
60
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 60 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 Apr 24, 2018, when this application, 15/961,799, was filed | Apr 24, 2038 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +60 days, USPTO patent term adjustment record | Jun 23, 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 | Jun 23, 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 |
|---|---|---|---|
| Apr 25, 2018 Reel 45634, frame 418 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Assignment of Assignor's Interest |
| Jul 23, 2019 Reel 49967, frame 358 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Corrective Assignment to Correct the Assignee's Registered Office Previously Recorded on Reel 045634 Frame 0418. Assignor(S) Hereby Confirms the Assignee's Registered Office Is Craigmuir Chambers, Road Town, Tortola, British Virgin Islands. |
| Oct 17, 2019 Reel 50753, frame 158 | Nginx, Inc. | F5 Networks, Inc. | Assignment of Assignor's 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
Jun 2038
Term ends Jun 23, 2038. Maintenance fees still fall due before then
Note
The 60 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2019 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.