Microsoft files federal antitrust lawsuit against Interdigital for “abusive licensing practices”
Microsoft files antitrust suit against InterDigital in patent feud — InterDigital Inc has violated U.S. antitrust law by failing to keep its promise to fairly license …
Context & Ripple Effects
This lawsuit is Microsoft's counterpunch in a year-long fight with InterDigital over its phone patents. An April ITC judge ruling found Microsoft phones infringed on two InterDigital patents, and within days of this antitrust filing the full ITC commission cleared the phones entirely — leaving Microsoft with a fresh legal front even as the infringement question flipped in its favor.
The move also fits a pattern: Microsoft had already gone on offense against another handset maker that year, suing Kyocera in an Android patent dispute, so it is simultaneously defending its own devices and attacking how a major patent licensor charges the industry.
First-order effects
- InterDigital now has to defend its entire licensing model — the suit alleges it broke its promise to license essential patents fairly, putting its royalty terms rather than any single device dispute under federal scrutiny.
Second-order effects
- Other handset makers paying InterDigital royalties gain a template: if Microsoft's antitrust argument holds, licensees can challenge FRAND commitments through competition authorities instead of only negotiating rates bilaterally.
Third-order effects
- Standard-essential-patent disputes shift ground from infringement litigation to antitrust litigation over licensing conduct — a structure that pressures every SEP holder whose business depends on portfolio royalties, not just InterDigital.
The trend: Patent fights between platform giants and licensing firms are migrating from who-infringed-whom court battles toward antitrust challenges to royalty-setting power itself.