Also listed on Nginx, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends Sep 30, 2037 · High confidence
20-year base term ends Apr 1, 2039
Held by F5 Networks, Inc.
Filed Apr 1, 2019 as application 16/372,086 · Granted Jun 22, 2021
Base term plus 8 days of patent term adjustment (USPTO delay) · capped by a resolved terminal disclaimer
Today
2019
2039
Clock starts
Apr 1, 2019
Apr 1, 2019
Term ends
Sep 30, 2037
Sep 30, 2037
Granted
Jun 22, 2021
Jun 22, 2021
base term
after the term ends
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
8
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 10,467,151.
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 8 days past its 20-year base term on prosecution delay. A terminal disclaimer resolved from the filed document caps it earlier. 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 1, 2019, when this application, 16/372,086, was filed | Apr 1, 2039 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +8 days, USPTO patent term adjustment record | Apr 9, 2039 | High confidence |
| Terminal disclaimer cap | Disclaimer resolved from the filed document (refs US 10,467,151) | capped to Sep 30, 2037 | 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 | Sep 30, 2037 | 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 3, 2019 Reel 48780, frame 843 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Assignment of Assignor's Interest |
| Jul 23, 2019 Reel 49835, frame 793 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Corrective Assignment to Correct the Receiving Party Address Previously Recorded at Reel: 48780 Frame: 843. Assignor(S) Hereby Confirms the Assignment. |
| 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
Sep 2037
Term ends Sep 30, 2037. Maintenance fees still fall due before then
Note
The 8 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 10,467,151.
Citations
1
later US patent cites this one
That is below the median of utility patents granted in 2021 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.