If a friend and I invent something, it's in both our interests to assign it to a company we own, rather than trying to figure out which "half" he owns and I own

If a friend and I invent something, it's in both our interests to assign it to a company we own, rather than trying to figure out which "half" he owns and I own, or if we own it in joint, or any other a thousand other crazy ways. Or, what rayiner said.