Missed Call LLC v. Twilio Inc. — Transferred to N.D. California in 101 Days
Missed Call, LLC filed a patent infringement suit against Twilio, Inc. in the Western District of Texas, asserting US9531872B2 covering missed call notification technology. The parties jointly agreed to transfer the case to the Northern District of California, resolving the venue question within just 101 days of filing.
Stipulated Texas-to-California venue transfer in missed call notification IP dispute
On October 24, 2023, Missed Call, LLC filed a patent infringement action against Twilio, Inc. in the United States District Court for the Western District of Texas (Case No. 1:23-cv-01294), presided over by Chief Judge Robert Pitman. The plaintiff asserted US9531872B2, a patent covering a communication apparatus and method for providing an indication about a missed call — technology directly relevant to Twilio’s cloud communications and programmable voice platform.
The case closed on February 2, 2024, after just 101 days, when both parties filed a Stipulated Motion to Transfer to the Northern District of California. Chief Judge Pitman granted the agreed motion and ordered the action transferred to the U.S. District Court for the Northern District of California. No merits determination, claim construction, or damages ruling was issued at this stage.
The speed of the agreed transfer — under 101 days — suggests that both parties recognised the Northern District of California as the more appropriate or convenient forum, likely given Twilio’s San Francisco headquarters and the concentration of relevant witnesses and evidence there. The public record does not disclose what, if any, concessions accompanied the stipulation, and the substantive merits of the infringement claims remain entirely unresolved.
Filing to resolution in 101 days
101 days from filing to transfer — resolved venue in under 4 months
What the stipulated transfer to N.D. California means for both parties
Stipulated transfer: both sides agreed to move venue
A stipulated transfer means both plaintiff and defendant jointly requested that the court move the case to a different district. Unlike a contested transfer motion — where a defendant argues the plaintiff’s chosen forum is improper — a stipulation signals mutual agreement on venue. Here, Missed Call, LLC and Twilio agreed to relocate proceedings to the Northern District of California, and Chief Judge Pitman granted that request without opposition.
28 U.S.C. § 1404(a) venue transferN.D. California: Twilio’s home turf and a major patent forum
The Northern District of California is one of the most active patent litigation venues in the United States and the jurisdiction where Twilio is headquartered. Transfer there typically concentrates proceedings near the defendant’s key witnesses, source code, and corporate records. For Missed Call LLC, agreeing to transfer may reflect a strategic concession or a negotiated arrangement. The case now continues on the N.D. California docket under separate case identifiers.
Forum: N.D. CaliforniaTransfer is not dismissal — litigation continues in California
A transfer order does not terminate the underlying infringement claims. The case moves in its entirety — including all filed pleadings, evidence, and deadlines — to the receiving court. Twilio has not been absolved of the infringement allegations, and Missed Call LLC retains its right to pursue the US9531872B2 claims before a California judge. Any prior rulings from the Texas court, however limited, would carry forward as part of the transferred record.
Claims survive transferEarly agreement on venue may signal broader settlement dialogue
When parties stipulate to transfer within 101 days of filing — before claim construction or discovery — it frequently suggests active settlement discussions running in parallel. Both sides incur less litigation cost by agreeing early, and moving to a defendant-friendly forum can be a bargaining chip for the plaintiff. The public record is silent on whether licensing terms were discussed, but the swift, cooperative resolution of the venue question is consistent with an emerging commercial dialogue.
Early cooperation signalFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | Missed Call, LLC | Company | Patent assertion entity — holder of US9531872B2 covering missed call notification systemsSearch in Eureka ↗ |
| Defendant | Twilio, Inc. | Company | Twilio, Inc. — cloud communications platform provider headquartered in San Francisco, CASearch in Eureka ↗ |
| Plaintiff counsel | William P. Ramey , III | Attorney | Counsel for Missed Call, LLCSearch in Eureka ↗ |
| Defendant counsel | Chris R. Schmidt | Attorney | Counsel for Twilio, Inc.Search in Eureka ↗ |
| Defendant counsel | Eric A. Buresh | Attorney | Counsel for Twilio, Inc.Search in Eureka ↗ |
| Presiding judge | Judge Robert Pitman | Chief Judge | Texas Western District Court — Chief JudgeSearch in Eureka ↗ |
Stipulation of dismissal — official text
The court’s order is administrative rather than substantive — it reflects only that the parties jointly consented to transfer and the court approved. No finding on infringement, validity, or claim scope was made. The phrase ‘IT IS ORDERED that this action is TRANSFERRED’ confirms the case moves intact to N.D. California. Twilio’s liability exposure under US9531872B2 is entirely unresolved, and the receiving court will handle all substantive proceedings from this point forward.
US9531872B2 — Missed Call Notification Communication Apparatus
US9531872B2 (application number US13/811195) covers a communication apparatus and associated method for providing an indication about a missed call. The patent sits at the intersection of telephony signalling and notification delivery — a technology domain that underpins modern cloud communications platforms. The claimed invention addresses how a system detects, processes, and communicates missed call events to end users or downstream applications, which is directly relevant to programmable voice and messaging services.
For the CPaaS sector, this patent represents meaningful claim coverage over functionality that is embedded in core product offerings from providers including Twilio, Vonage, and others. Twilio’s programmable voice API — which enables developers to handle call status events including missed or unanswered calls — is precisely the kind of implementation that a broad reading of US9531872B2 could implicate. Any competitor offering similar call event notification infrastructure should assess their exposure to this claim set before the N.D. California court rules on scope.
Should your product team run an FTO against US9531872B2?
If your organisation develops, sells, or integrates cloud communications infrastructure — particularly features that detect unanswered calls and trigger downstream notifications — US9531872B2 is a patent you cannot ignore. The claims cover apparatus and method elements, meaning both hardware-oriented implementations and software-defined notification flows may fall within scope. CPaaS vendors, UCaaS providers, and developers building on Twilio or competing APIs should conduct a freedom-to-operate review before launching or expanding missed call notification features.
PatSnap Eureka’s FTO Search Agent can map your product’s technical features against the independent and dependent claims of US9531872B2, surface prior art that may support invalidity arguments, and flag related continuation or family patents that could extend the assertion risk. Setting up claim change monitoring on this patent will also alert your team if the claim scope is amended during any inter partes review or reexamination that emerges from the N.D. California proceedings.
Run a freedom-to-operate analysis on US9531872B2 to assess your product’s exposure
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What this case signals for the cloud communications IP landscape
A fast, stipulated transfer in a comms patent suit against a major CPaaS provider raises strategic questions for competitors, licensees, and IP portfolio managers.
Twilio’s patent exposure in missed call and notification technology is live
US9531872B2 remains in force and the infringement claims are unresolved. Any company building on Twilio’s APIs — or offering competing missed call notification features — should treat this patent as an active risk vector. The transfer to N.D. California, not dismissal, confirms the plaintiff intends to continue pursuing the claims.
Western District of Texas remains a filing magnet, even when cases transfer out
Missed Call LLC’s initial choice of W.D. Texas follows a well-documented pattern among patent assertion entities. Even when cases ultimately transfer, the initial filing creates procedural leverage. IP teams tracking assertion campaigns should monitor W.D. Texas filings in the communications technology sector as early indicators of broader enforcement waves.
Missed v Twilio — key questions answered
Missed Call, LLC filed a patent infringement action against Twilio, Inc. in the Western District of Texas on October 24, 2023, asserting US9531872B2. The parties filed a Stipulated Motion to Transfer to the Northern District of California, which Chief Judge Robert Pitman granted on February 2, 2024. The case was transferred — not dismissed — and the infringement claims remain unresolved.
US9531872B2 covers a communication apparatus and method for providing an indication about a missed call. It is relevant to Twilio because Twilio’s programmable voice platform enables developers to handle call status events — including missed and unanswered calls — and trigger notifications accordingly. A broad claim construction could implicate these core API features.
The transfer was stipulated — both parties agreed and jointly filed the motion. The court granted it without contest. The Northern District of California is Twilio’s home jurisdiction and a major patent litigation forum. The public record does not disclose the specific reasons the parties agreed, but proximity to Twilio’s witnesses, evidence, and headquarters is a common driver for such transfers.
No. A transfer order is not a dismissal and does not resolve the merits. The infringement claims asserted under US9531872B2 survive the transfer intact and will be adjudicated by the Northern District of California. Twilio has not been found to infringe or not infringe, and no invalidity ruling has been made.
Missed Call, LLC was represented by William P. Ramey III of Ramey LLP, a firm known for patent assertion activity in Texas courts. Twilio was represented by Chris R. Schmidt and Eric A. Buresh of Erise IP PA, a firm with significant patent litigation defence experience. The early stipulated transfer suggests both legal teams moved efficiently on the venue question.
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