Invalidity searches are essentially efforts to locate prior art that undermines a patent’s legal validity. They are among the most consequential and underappreciated tasks in patent litigation. When a patent is asserted against a defendant, finding prior art that anticipates or renders the patent’s claims obvious can invalidate it entirely, effectively ending the case.

These searches are often treated as routine deliverables, but they define what legal arguments are even available. Complicating factors include tight litigation deadlines (invalidity contentions often due within 45–60 days), language and classification barriers with global prior art databases, and the need for precise claim mapping by domain experts.

Why it Matters

The strategic value is significant. Strong prior art supports invalidity contentions, fuels Inter Partes Review (IPR) petitions at the PTAB, (which cancel claims at rates of 75–80%,) and creates settlement leverage that can resolve cases before costly litigation escalates.

The stakes are correspondingly high. Average U.S. patent litigation costs roughly $2.8 million per side, with damages potentially reaching hundreds of millions. A missed foreign-language reference or weak search can mean the difference between early dismissal and years of exposure. Conversely, a single “killer” prior art reference can transform a losing defense into a winning one.

Ultimately, thoroughness in the search phase is not optional. It is the foundation on which every argument, motion, and negotiation rests, making the cost of a rigorous search trivial compared to the cost of getting it wrong.

Learn More

Global Patent Solutions’ David Odland recently explored this topic in an article published by Legalverse Media. The article, titled “Invalidity Searches: What Is REALLY on the Line?” walks through:

• what invalidity searches are and when they’re used,
• the procedural pressures that make thoroughness non-negotiable (particularly the 45–60-day invalidity contention windows in districts like N.D. Cal. and E.D. Tex.),
• the strategic leverage strong prior art creates in both PTAB proceedings and settlement negotiations, and
• the very real financial and reputational risks, for clients and firms alike, when searches fall short.

Read the full article here.

And if you’d like to chat with David or another member of the Global Patent Solutions team about invalidity or other patent searches, reach out today!