I'm currently in the process of getting a name trademarked for a t-shirt business. I have sold some t-shirts in the past with my brand name but I never had it trademarked because I was unsure if it would be profitable and it really was a hobby. But business has been good and I would like to trademark the name. However, there is another brand that sells t-shirts that is similar in name to mine. For example, if my brand name is Black Heart and there is a t-shirt brand already named Black Heart Logo. Could I be sued for trademark infringement?