What Happened to ASUS Technology Licensing Inc. et al. v. AT&T Inc. et al. (4G/5G Patent Infringement Lawsuit)?
ASUS, through its licensing entities, sued AT&T, Verizon, and T-Mobile in 2023, alleging infringement of its 4G and 5G wireless technology patents. The lawsuit, which also involved network equipment providers Ericsson and Nokia, concluded on August 26, 2026, with a federal jury in Texas ruling in favor of the defendant carriers and equipment makers, finding ASUS's patents invalid and ASUS in breach of its own fair-licensing obligations.
Quick Answer
A federal jury in Texas ruled on August 26, 2026, that AT&T, Verizon, and T-Mobile did not infringe on ASUS's 4G and 5G wireless technology patents. The jury found the three patents asserted by ASUS to be invalid and further determined that ASUS had breached its fair-licensing obligations to the carriers, Ericsson, and Nokia. ASUS had sought $436 million in damages, but the verdict denied these claims, marking a significant victory for the telecommunications companies.
📊Key Facts
📅Complete Timeline13 events
ASUS Files Patent Infringement Lawsuit
ASUS Technology Licensing Inc., Innovative Sonic, Celerity IP LLC, and ASUSTeK Computer Inc. filed a patent infringement lawsuit against AT&T, Verizon, and T-Mobile in the Eastern District of Texas, alleging infringement of 4G and 5G wireless technology patents.
ASUS Sues Samsung Over 4G/5G Patents
Around the same time, ASUS also sued Samsung in the Eastern District of Texas for alleged infringement of its 4G and 5G wireless communication patents, indicating a broader patent enforcement strategy.
Court Provides Claim Construction Guidance
In the case, the court provided guidance on when a claim term rooted in standards terminology would be given its 'plain and ordinary meaning' versus a technical construction.
Unfair Competition and Tortious Interference Suit Filed
Plaintiffs filed a separate suit against the carrier defendants and Ericsson in a Dallas County state court, asserting claims for unfair competition and tortious interference, which was later removed to federal court.
Wilus Sues ASUS Subsidiary Over WiFi 6 SEPs
Wilus brought SEP infringement lawsuits in the Eastern District of Texas against HP, Samsung, and ASUS subsidiary Askey, a WiFi router maker, involving WiFi 6 standard-essential patents.
Patent Infringement Case Stayed
The patent infringement case was stayed pending the resolution of motions to dismiss in a related antitrust case, Celerity IP LLC v. AT&T Corp., highlighting the intertwined legal strategies.
Nokia Launches Global Litigation Against ASUS
Nokia initiated a global litigation campaign against Asus, Acer, and Hisense, targeting products like Asus laptops and smartphones over video coding technology patents.
Injunctions Against ASUS in Nokia Case
The Munich Regional Court granted injunctions against Asus and Acer based on a Nokia patent essential to the H.265 video coding standard, part of Nokia's broader litigation campaign.
Wilus Seeks Injunction Against ASUS Subsidiary
Wilus sought a permanent injunction against ASUS subsidiary Askey's WiFi routers in the Eastern District of Texas, based on admitted infringement of several valid WiFi 6 SEPs.
ASUS and Nokia Settle Video Coding Patent Dispute
ASUS and Nokia reached a licensing agreement, ending their litigation over video coding technology patents and withdrawing pending legal proceedings in Germany and at the UPC.
Motions to Strike Expert Testimony Denied
In the ASUS v. AT&T et al. case, motions to strike and exclude testimony of expert witnesses Dr. Mohamed Helaoui and Dr. Vijay Madisetti were denied.
Motion for Summary Judgment Denied
A sealed motion for summary judgment in the ASUS v. AT&T et al. case was denied by District Judge Rodney Gilstrap.
Jury Rules in Favor of Carriers
A federal jury in Texas ruled for AT&T, Verizon, T-Mobile, Ericsson, and Nokia, finding ASUS's 4G and 5G wireless technology patents invalid and that ASUS breached its fair-licensing obligations. ASUS's claim for $436 million in damages was denied.
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🔍Deep Dive Analysis
The legal battle between ASUS and major U.S. telecommunications carriers AT&T, Verizon, and T-Mobile centered on allegations of patent infringement related to essential 4G and 5G wireless communication technologies. ASUS, through its licensing subsidiaries ASUS Technology Licensing Inc., Innovative Sonic, and Celerity IP LLC, initiated the lawsuit in 2023 in the Eastern District of Texas, a common venue for patent disputes. The core of ASUS's claim was that the carriers' devices infringed upon its standard-essential patents (SEPs) through their use of network equipment supplied by Ericsson and Nokia, which subsequently intervened in the case to defend their products and customers.
ASUS asserted that it had invested significantly in the research and development of cellular standards, accumulating a portfolio of SEPs that are indispensable for implementing 4G and 5G technologies. The company sought $436 million in damages, arguing that the carriers were utilizing its patented innovations without proper licensing. The lawsuit highlighted a recurring tension in the telecommunications industry between patent holders seeking fair compensation for their intellectual property and implementers aiming to avoid what they perceive as excessive licensing fees.
Throughout the litigation, both sides engaged in a complex legal struggle. ASUS accused the carriers of colluding to avoid reasonable licensing fees, while the defendants, including Ericsson and Nokia, countered that ASUS had not invented the technology in dispute and had failed to uphold its own obligations to license its patents on fair, reasonable, and non-discriminatory (FRAND) terms. The case saw various procedural developments, including discussions on claim construction and motions related to parallel antitrust and unfair competition claims filed by ASUS's licensing entity against the carriers.
A pivotal moment arrived on August 26, 2026, when a federal jury in Texas delivered a unanimous verdict. The jury sided with AT&T, Verizon, T-Mobile, Ericsson, and Nokia, concluding that the three patents ASUS accused them of infringing were invalid. Furthermore, the jury found that ASUS itself had breached its fair-licensing obligations to all five companies involved in the defense. This outcome not only denied ASUS the substantial damages it had sought but also underscored the complexities and risks associated with asserting standard-essential patents.
The consequences of this verdict are significant for ASUS, as it closes off a potential revenue stream from these specific patent assertions against the major U.S. carriers. For AT&T, Verizon, and T-Mobile, the ruling represents a successful defense against a substantial patent infringement claim, potentially setting a precedent for similar disputes. While ASUS has been active in other patent litigations, including a settlement with Nokia over video coding technology in June 2026, this particular outcome against the U.S. carriers marks a notable setback in its 4G/5G patent enforcement strategy.
What If...?
Explore alternate histories. What if ASUS Technology Licensing Inc. et al. v. AT&T Inc. et al. (4G/5G Patent Infringement Lawsuit) made different choices?