What Happened
Venue rules tell you which districts can hear patent cases. Personal jurisdiction is different—it asks whether the court has power over the defendant at all. For patent owners, there's good news: sending cease-and-desist letters doesn't subject you to jurisdiction wherever the letters are received. That's been the rule since a 1998 case called Red Wing Shoe.
Why It Matters
Imagine you own a patent and you think a company in California is infringing. You send them a letter saying "stop infringing or we'll sue." Can they turn around and sue you in California for a declaratory judgment saying they don't infringe? Generally, no. The Federal Circuit has consistently held that patent enforcement activities alone—letters, demands, even filing suit—don't create personal jurisdiction over the patent owner.
This protects patent owners from being haled into court in every jurisdiction where they send a demand letter. It's based partly on the First Amendment right to petition the government (including courts) without fear of retaliation.
But there are limits. If a patent owner has other contacts with a forum—licensing negotiations, business operations, enforcement activities beyond mere letters—jurisdiction might exist.
What You Should Know
If you're a patent owner, you can generally send demand letters without creating jurisdiction in the recipient's home state. But be thoughtful about it. If you have other contacts there, the analysis changes.
If you're an accused infringer wanting to file a declaratory judgment, don't rely solely on cease-and-desist letters to establish jurisdiction. Look for other contacts—licensing activity, business operations, enforcement against others in the forum.
Jurisdiction is a threshold issue. Get it wrong, and your case gets dismissed before anyone looks at the merits.