Preliminary Injunctive Relief: Theory and Evidence from Patent Litigation

Jean O. Lanjouw, Josh Lerner

NBER Working Paper No. 5689
Issued in July 1996
NBER Program(s):   PR

This paper examines the suggestion that established plaintiffs request preliminary injunctions to engage in predation against less financially healthy firms. We first present a model in which differences in litigation costs drive the use of preliminary injunctions in civil litigation. The hypothesis is tested using a sample of 252 patent suits, which allows us to characterize the litigating parties while controlling for the nature of the dispute. The evidence is consistent with the predation hypothesis. We then explore various implications of the model and the impact of policy reforms.

(3681 K)

Published: "Tilting the Table? The Use of Preliminary Injunctions," Journal of Law and Economics, 44 (October 2001) 573-603.

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