All of these things should have been notarized and filed in the state you formed the LLC in. There are records for all of this, and if the IP was in the name of the old LLC, which you were a Member of, he shouldn't have been able to do any of these actions unless he just forged your signature.

Seems odd to me. Find a lawyer, if you have a convincing case they might work pro bono at first if they can foresee a big payoff.