Also listed on Nginx, Inc., an earlier holder on the record. The recorded assignments below show how it moved.
Term ends May 7, 2039 · High confidence
20-year base term ends Sep 5, 2037
Held by F5 Networks, Inc.
Filed Sep 5, 2017 as application 15/695,729 · Granted Apr 20, 2021
Base term plus 609 days of patent term adjustment (USPTO delay)
Today
2017
2039
Clock starts
Sep 5, 2017
Sep 5, 2017
Term ends
May 7, 2039
May 7, 2039
Granted
Apr 20, 2021
Apr 20, 2021
base term
patent term adjustment
fee events
Updated Nov 15, 2026 · includes USPTO assignment & status data published Nov 15, 2026 and grant & fee data published Nov 10, 2026 (weekly) · how we know
609
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 609 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 Sep 5, 2017, when this application, 15/695,729, was filed | Sep 5, 2037 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +609 days, USPTO patent term adjustment record | May 7, 2039 | 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 | May 7, 2039 | 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 |
|---|---|---|---|
| Sep 5, 2017 Reel 43492, frame 599 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Assignment of Assignor's Interest |
| Jul 23, 2019 Reel 49830, frame 290 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx | Corrective Assignment to Correct the Assignee's Registered Office Previously Recorded at Reel: 043492 Frame: 0599. Assignor(S) Hereby Confirms the Assignment. |
| Aug 6, 2019 Reel 49967, frame 620 | Sysoev, Igor; Bartenev, Valentin; Shadrin, Nikolay; Romanov, Maxim | Nginx, Inc. | Corrective Assignment to Correct the Assignee's Name Previously Recorded at Reel: 049830 Frame: 0290. Assignor(S) Hereby Confirms the Corrective 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
May 2039
Term ends May 7, 2039. Maintenance fees still fall due before then
Note
The 609 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
10
later US patents cite this one
That is top 25% 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.