Patent law isn’t just about inventions, it’s also about the judges who interpret the rules. In their law review article Expertise, Ideology, and Dissent, Professors Gugliuzza, Nash, and Rantanen dive into how judges on the Federal Circuit (the court that hears nearly all patent appeals) disagree with one another, and what those disagreements reveal.
The authors analyzed over 9,000 Federal Circuit decisions from 2008 to 2021. Their focus? Dissents–those filed opinions when a judge says, “I don’t agree with the majority.” Dissents are quite common in patent cases at the Federal Circuit level. Why? The authors suggest it’s a mix of ideology, judicial philosophy, and subject-matter expertise.
Here’s one finding from the study that I found interesting: judges with technical backgrounds (think engineers and scientists) are slightly more likely to dissent in all patent cases, but significantly more likely to dissent in patent cases where the majority opinion wasn’t written by a judge with a technical background.
The takeaway? Even in a specialized court, expertise and ideology shape how judges see the law, but their political leaning has less of an effect than the authors predicted. And when they disagree, it’s not just academic, it can influence how patent law evolves.
Link to the paper: