Paul Allen has rekindled a controversy over patent trolls

DEEP-FRIED beer may sound scrumptious, but is it patentable? Mark Zable, an inventive Texan, thinks it is. To protect his novel production process, which involves encasing the alcohol in batter and dunking it in a fryer, he recently applied for a patent. He wants to profit if others exploit his beery brainwave.

Without patents to protect their creations, inventors would have little incentive to invent. But some Americans fret that patent protection has grown too strong. The system breeds so many lawsuits, they worry, that it throttles the innovation it is supposed to promote. …

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