Lapsed Jul 9, 2023 on the fee record · High confidence
20-year base term ends Aug 18, 2036
First maintenance fee unpaid; grace period ended.
Held by 8X8, Inc.
Filed Apr 19, 2017 as application 15/491,511 · Granted Jul 9, 2019
Base term, 20 years from filing, plus 77 days of patent term adjustment (USPTO delay)
Today
Lapsed Jul 9, 2023
2016
2036
Clock starts
Aug 18, 2016
Aug 18, 2016
No longer in force
Jul 9, 2023
Jul 9, 2023
Granted
Jul 9, 2019
Jul 9, 2019
Term would have run to
Nov 3, 2036
Nov 3, 2036
base term
patent term adjustment
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
77
Days of term adjustment
Read from the USPTO patent term adjustment record, not recalculated here.
None
Terminal disclaimer
No disclaimer on this record.
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.
42
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 Nov 3, 2036: its 20-year base term plus 77 days of term adjustment for prosecution delay. 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 Aug 18, 2016, when applications 15/240,391 and 15/240,457, the earliest non-provisional applications in its chain, were filed (this one was filed Apr 19, 2017) | Aug 18, 2036 | High confidence |
| Continuity chain | Every parent in the chain resolved | no change | High confidence |
| Patent term adjustment | +77 days, USPTO patent term adjustment record | Nov 3, 2036 | 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 | 0 of 3 maintenance fees paid | lapsed Jul 9, 2023 | High confidence |
| Computed term end | The steps above, in order | Jul 9, 2023 | High confidence |
This family
| US 10,404,759 | In force Feb 2037 | Feb 2037 |
| US 10,135,974 | In force Dec 2036 | Dec 2036 |
| US 10,027,624 | In force Dec 2036 | Dec 2036 |
| US 10,122,682 | In force Aug 2036 | Aug 2036 |
| US 10,057,412 | In force Aug 2036 | Aug 2036 |
| US 10,165,114 | In force Sep 2036 | Sep 2036 |
| US 11,044,365 | In force Nov 2037 | Nov 2037 |
| US 10,348,902 | this patent Jul 2023 | Jul 2023 |
8 of 42 applications in this family shown, earliest filings first. 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 |
|---|---|---|---|
| Apr 24, 2017 Reel 42129, frame 760 | Liu, Zhishen | 8X8, Inc. | Assignment of Assignor's Interest |
| Aug 5, 2022 Reel 61085, frame 861 | 8X8, Inc.; Fuze, Inc. | Wilmington Savings Fund Society, FSB | Intellectual Property Security Agreement |
| Jan 26, 2024 Reel 66383, frame 936 | 8X8, Inc.; Fuze, Inc. | Wilmington Savings Fund Society, FSB | Corrective Assignment to Correct the Property Numbers Section to Remove Application Numbers 11265423, 11252205, 11240370, 11252276, and 11297182 Previously Recorded on Reel 061085 Frame 0861. Assignor(S) Hereby Confirms the Intellectual Property Security Agreement. |
| Aug 5, 2024 Reel 68328, frame 569 | Wilmington Savings Fund Society, FSB | 8X8, Inc.; Fuze, Inc. | Release of Security Interest |
| Aug 5, 2024 reel/frame not recorded | Wilmington Savings Fund Society, FSB | 8X8, Inc. | Release of Security Interest |
| Aug 5, 2024 reel/frame not recorded | Wilmington Savings Fund Society, FSB | Fuze, Inc. | Release of Security 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
Note
The 77 days of patent term adjustment (USPTO delay) are read from the USPTO record, not recalculated by us
Citations
14
later US patents cite this one
That is top 25% 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.