When Wei Quan’s hopes for a $6,250 refund from Arcotech Uniexpat Inc. evaporated, he turned to a conversion claim against Craig Piatti, a corporate officer who allegedly “maintained wrongful control of funds owed to Quan” by failing to authorize repayment the company reportedly promised.A Cook County judge granted Piatti’s motion to dismiss the conversion claim (Count 3 of Quan’s complaint …