After the plaintiff filed a Second Amended Complaint against Fieldpiece Instruments, Inc. (“Defendant”) for patent infringement, the Defendant filed its an answer raising a series of affirmative defenses to Plaintiff’s claims. The Plaintiff then moved to strike several of the Defendant’s affirmative defenses as insufficient or improper under Fed. R. Civ. P. 12(f).
The Plaintiff argued that Defendant’s fourth affirmative defense, which includes “laches, waiver, estoppel, and acquiescence,” is “improper, confusing and fails to give Plaintiff fair notice. As explained by the district court, in support of these four discrete defenses, Defendant’s Answer only provided a single, conclusory sentence: “[Plaintiff] is barred in whole or in part from asserting the [patent-in-suit] against Fieldpiece under the equitable doctrines of laches, waiver, estoppel, and/or acquiescence.”
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