Dataphase Systems, Inc. v. C L Systems, Inc.

Summary

The Eighth Circuit, sitting en banc, vacated a preliminary injunction against C L Systems and remanded for further proceedings. The court clarified that preliminary-injunction applications require consideration of four factors: irreparable harm, the balance of harms, likelihood of success on the merits, and the public interest, applied flexibly rather than as a rigid mathematical test.

Holdings

1. A district court must weigh four considerations in every preliminary-injunction application: the threat of irreparable harm to the movant, the balance between that harm and the injury an injunction would inflict on other litigants, the probability of the movant’s success on the merits, and the public interest.
2. The probability-of-success factor does not require the movant in every case to prove a greater-than-fifty-percent mathematical likelihood of prevailing.
3. The district court abused its discretion by granting the preliminary injunction because its findings did not establish irreparable harm or a substantial probability that CLSI’s statements were false or misleading and that Dataphase would prevail at trial.

Questions Presented

1. What standard governs a federal district court’s decision whether to grant or deny a preliminary injunction in the Eighth Circuit?
2. Did the district court abuse its discretion by granting a preliminary injunction without findings of irreparable harm and a substantial probability of success on the merits?

Disposition

vacated