The accused patent troll MPHJ Technology Investments is trying a different tack in its battle with Vermont Attorney General William Sorrell, bringing a new federal lawsuit to block the AG from pursuing state consumer protection claims against the company.

MPHJ sued Sorrell in U.S. district court in Burlington on Monday, seeking a declaratory judgment that Vermont’s laws protecting consumers from bad faith assertions of patent infringement are invalid and preempted by the U.S. Constitution. The move comes two weeks after lawyers at Farney Daniels failed in their latest bid to defeat Sorrell’s original lawsuit, which claims that MPHJ tried to shake down Vermont businesses with bogus infringement claims.

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