Background
Inguran, LLC (doing business as STGenetics) holds U.S. Patent No. 8,206,987, directed to a method for sorting bull sperm cells by DNA content to preselect the sex of offspring — a technology critical to the cattle breeding and dairy industries. In an earlier lawsuit against ABS Global, Inc., Inguran asserted claims for direct patent infringement and won a judgment against ABS. However, Inguran did not assert induced infringement — a theory under which a defendant is liable for encouraging or instructing others to infringe — in that first suit.
Inguran later brought a second lawsuit against ABS, this time asserting induced infringement. The district court dismissed the second suit under the doctrine of res judicata (claim preclusion), ruling that Inguran should have brought the induced infringement claims in the first lawsuit and could not now relitigate claims that could have been raised earlier. Inguran appealed, arguing that induced infringement is a separate cause of action with different operative facts from direct infringement.
The Court’s Holding
The Federal Circuit reversed. The court applied the general rule of claim preclusion: a prior judgment bars relitigation of claims that were actually litigated or that could have been litigated in the prior action based on the same transactional facts. The key question was whether Inguran’s induced infringement claims arose from the same transaction or series of transactions as the earlier direct infringement claims.
The court found that they did not. Direct infringement and induced infringement are legally distinct theories with different operative facts: direct infringement focuses on whether the defendant itself performed the patented method; induced infringement focuses on whether the defendant actively encouraged third parties (such as customers) to infringe. The facts required to prove that ABS’s customers practiced the patented sorting method — and that ABS knowingly encouraged them to do so — differed from the facts about ABS’s own direct use of the method. Because the induced infringement claims were based on materially different facts and were not actually litigated in the first suit, claim preclusion did not bar the second lawsuit. The district court’s dismissal was reversed.
Key Takeaways
- Claim preclusion does not automatically bar a second patent infringement suit based on induced infringement when the first suit was limited to direct infringement — the two theories have different operative facts.
- Direct infringement (defendant infringes directly) and induced infringement (defendant encourages others to infringe) are legally and factually distinct; a judgment on one does not necessarily resolve the other.
- Patent holders who discover evidence of induced infringement — such as a defendant instructing customers to use a patented method — after concluding a direct infringement case may be able to bring a separate action for the induced infringement.
- Litigants and their counsel should carefully assess at the outset of patent litigation whether all viable infringement theories (direct, indirect, contributory) should be raised in the same case to avoid potential preclusion arguments in future suits.
Why It Matters
Inguran v. ABS Global has practical implications for how patent holders structure and sequence their patent infringement litigation. Companies that first sue for direct infringement — focusing on a defendant’s own use of a patented technology — are not necessarily barred from later suing for induced infringement if they discover that the defendant has been actively encouraging its customers or partners to use the patented method. This decision gives patent holders some flexibility to pursue follow-on infringement theories as facts develop, while also serving as a reminder that counsel should evaluate all viable theories at the outset to avoid unnecessary procedural hurdles in subsequent litigation.
For technology companies that both use patented processes themselves and supply equipment or services that enable their customers to use those processes, the ruling signals that settling or defending only the direct infringement claims may not fully extinguish ongoing liability if the inducement theory has different factual bases.