Background
Personalized Media Communications, LLC (PMC) is a patent holding company that owns a large portfolio of patents relating to digital broadcast and decryption technology, many of which trace back to patent applications filed in the 1980s and 1990s. PMC sued Apple Inc., alleging that Apple FairPlay — the digital rights management (DRM) technology that Apple uses to protect purchased content on iPhones, iPads, Macs, and the iTunes ecosystem — infringed its U.S. Patent No. 8,191,091. After a jury trial in the Eastern District of Texas, the jury found for PMC and awarded over $308 million in reasonable-royalty damages.
However, the district court also conducted a separate bench trial on the equitable defense of prosecution laches — a doctrine that can render a patent unenforceable when the patent applicant engaged in unreasonable and unexplained delay in prosecuting the application through the USPTO. The district court found that PMC had done exactly that: through a strategy of filing hundreds of continuation applications and deliberately managing the prosecution timeline, PMC kept certain patent applications pending for over two decades, allowing the technology landscape to change in ways that made the later-issued claims more valuable and more applicable to products that did not exist when the original applications were filed. The district court found the ‘091 patent unenforceable and vacated the jury’s $308 million award. PMC appealed.
The Court’s Holding
The Federal Circuit affirmed the unenforceability finding and the vacatur of the damages award. The court agreed that PMC’s conduct amounted to an egregious abuse of the patent system. Prosecution laches requires showing two things: first, that the patentee engaged in an unreasonable and unexplained delay in prosecution; and second, that this delay caused material prejudice to a party that relied on the absence of the patent claims during the delay period. The court found both elements present.
On delay, the court credited the district court’s findings that PMC deliberately managed the prosecution of its applications to keep claims pending and available for assertion against commercially successful products that emerged years after the original applications were filed. The sheer volume of continuation applications — hundreds in all — combined with the extended prosecution period spanning decades, supported the conclusion that the delay was unreasonable and not explained by legitimate prosecution activity. On prejudice, the court found that Apple had developed FairPlay and built its entire digital commerce ecosystem during the period of PMC’s prosecution delay, without any notice that such pending claims could be asserted against DRM-dependent businesses. This reliance-based prejudice satisfied the second element of the laches defense.
Key Takeaways
- Prosecution laches can render a patent unenforceable even after a jury has awarded hundreds of millions of dollars in damages — the equitable defense can override an infringement verdict.
- Filing large numbers of continuation applications over extended periods, combined with a strategy of deferring claim prosecution until technology has advanced in commercially favorable ways, can constitute the kind of unreasonable and unexplained delay that supports a prosecution laches finding.
- Prejudice for prosecution laches purposes can be established by showing that potential infringers built significant businesses during the period of delay, relying on the absence of issued claims that the patentee was silently maintaining in pending applications.
- Companies facing patent assertions from holders of very old patent families should investigate the prosecution history for laches defenses, particularly when the asserted claims were kept pending through multiple continuation applications over long periods.
Why It Matters
This case is one of the most financially significant prosecution laches rulings in recent history — a $308 million jury verdict wiped out entirely on equitable grounds. It sends a strong signal to patent assertion entities (PAEs) and others who employ continuation-application strategies to keep claims pending for years or decades while the technology industry develops around them: this conduct has limits, and when it crosses into unreasonable delay that prejudices the public and potential infringers, courts will deny enforcement of the resulting patents.
For technology companies building products and platforms that depend on foundational technologies like DRM, the decision provides some comfort that the patent system’s equitable doctrines can serve as a check against opportunistic assertion of aged claims against established commercial practices. For patent prosecutors, the case is a cautionary tale about the risks of continuation strategies designed more to keep options open for future assertion than to legitimately advance the prosecution of the underlying invention. Prosecution strategy should be driven by the merits of the invention and the applicant’s genuine interest in securing timely protection — not by the opportunity to capture technology that has since been independently developed by the industry.