Removing a Sewn on patch from hoodie?

I have a thick carhartt hoodie with my former employers logo on it. There is a small one on the right chest and the entire back has one too. Since I dont work there anymore, I feel dumb wearing it but its so warm and great for winter that I am going to keep it. Does anyone know how to take these patches off without damaging the sweater? Any help is greatly appreciated. Thanks!