Term ends Oct 1, 2029 · High confidence

Computed 20-year base term

Held by Twilio, Inc.

Filed Sep 20, 2017 as application 15/709,905 · Granted Jan 22, 2019

Base term, 20 years from filing

Today

20 years from filing

Term ends Oct 1, 2029

2009 2029

Clock starts
Oct 1, 2009

Term ends
Oct 1, 2029

Granted
Jan 22, 2019

base term 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

None

Term adjustment

No prosecution delay on this record.

None

Terminal disclaimer

No disclaimer on this record.

2 of 2

Maintenance fees paid

Two maintenance fees can end this term early, the ones due 3.5 and 7.5 years from grant; the third one's grace period runs past the term end. This counts the ones the record shows paid.

Family applications on record here

Applications sharing this one's continuity chain whose file history this site holds. The family may have others.

This patent's term is its 20-year base term, with no adjustment for prosecution delay. 2 of 2 maintenance fees are 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 Oct 1, 2009, when application 12/572,258, the earliest non-provisional in its chain, was filed (this one was filed Sep 20, 2017)	Oct 1, 2029	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	None on record	no cap applied	High confidence
Patent term extension	None on file	no change	High confidence
Fee events	2 of 2 maintenance fees paid	In force	High confidence
Computed term end	The steps above, in order	Oct 1, 2029	High confidence

This family

US 8,964,726	In force Nov 2030	Nov 2030
US 9,407,597	In force Oct 2029	Oct 2029
US 9,807,244	In force Oct 2029	Oct 2029
US 10,187,530	this patent Oct 2029	Oct 2029
US 10,455,094	In force Oct 2029	Oct 2029
US 11,005,998	In force Oct 2029	Oct 2029
US 11,632,471	In force Nov 2029	Nov 2029
US 11,665,285	In force Dec 2029	Dec 2029

8 of 12 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
Sep 20, 2017 Reel 43638, frame 145	Lawson, Jeffrey; Wolthuis, John; Cooke, Evan	Twilio, 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

Oct 2029

Term ends Oct 1, 2029. No further fees fall due before then

Citations

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.

In force means the term is running and no lapse is on record. It is not a finding that the patent is valid.

Telephony Web Event System and Method