Those are the same exact hinges my basement windows use. I dont know what they are called but they work the same way. Maybe doing a search for that might help. I will look now and post back if I find something.
So I did some searching and eventhough I couldnt find the exact name of them those "hinges" are the same ones used in hopper style basement windows. I dont think "hinge" is the word you should be using as those are not hinges.