Defendants in patent cases often seem to throw in somewhat obscure affirmative defenses with little or no factual support. "Unclean hands" is a classic example. Defendants will sometimes seem to include defenses like unclean hands and prosecution latches with no real factual support (and, I suspect, not always the best grasp on what those defenses really mean).
Judge Stark issued an opinion today on a motion to strike "unclean hands" and "prosecution laches" defenses offers an example of what happens when a defendant actually does adequately support these defenses.
First, the standard: to succeed on a motion to strike affirmative defenses, the insufficiency must be "clearly apparent":
"[P]ursuant to Rule …