As'salamu Alaikum dear brother Syed,
In my opinion, if the trademark is only letters, then it should be ok. But if you have sexual or pagan objects in there, then it wouldn't be allowed not only in Prayer (Salat), but all the time. Also, if the word or letters are not suggestive of anything sinful, then the wear should be ok. Otherwise, it is haram (sinful).
I hope this helps, Insha'Allah.
Take care,
Osama Abdallah