In UNILOC USA, Inc. v. Microsoft Corp., what did the court hold about the 25% rule?

In UNILOC USA, Inc. v. Microsoft Corp., what did the court hold about the 25% rule?

• A. Admissible
• B. Inadmissible
• C. Admissible with conditions
• D. Not applicable

Answer: (B)

The key idea here is how patent damages are calculated. In patent cases, a reasonable royalty should come from a careful, case‑specific analysis—often framed as a hypothetical negotiation between the patent holder and the infringer, taking into account the patented invention’s value and the various factors that affect value. A fixed rule-of-thumb like a 25% royalty is not a proper way to determine that value because it doesn’t tie the rate to the facts of the case or to how the market would have valued the invention. In UNILOC USA, Inc. v. Microsoft Corp., the court said that using a 25% rule to set damages is inadmissible. It criticized this rule as an unreliable, oversimplified method that can distort the true value of the patented invention and ignores the detailed evidentiary framework (including the hypothetical negotiation and the Georgia-Pacific factors) that should govern royalty damages. Because the 25% rule isn’t a legally sound basis for calculating damages, it cannot be used to support a damages award. So, the holding is that the 25% rule is inadmissible as a method for determining a reasonable royalty in patent damages.

The key idea here is how patent damages are calculated. In patent cases, a reasonable royalty should come from a careful, case‑specific analysis—often framed as a hypothetical negotiation between the patent holder and the infringer, taking into account the patented invention’s value and the various factors that affect value. A fixed rule-of-thumb like a 25% royalty is not a proper way to determine that value because it doesn’t tie the rate to the facts of the case or to how the market would have valued the invention.

In UNILOC USA, Inc. v. Microsoft Corp., the court said that using a 25% rule to set damages is inadmissible. It criticized this rule as an unreliable, oversimplified method that can distort the true value of the patented invention and ignores the detailed evidentiary framework (including the hypothetical negotiation and the Georgia-Pacific factors) that should govern royalty damages. Because the 25% rule isn’t a legally sound basis for calculating damages, it cannot be used to support a damages award.

So, the holding is that the 25% rule is inadmissible as a method for determining a reasonable royalty in patent damages.