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You need to be honest with him and tell him things aren't working out and that he was originally brought on as a technical cofounder and he hasn't been working out for that role and he wants to switch to being a business cofounder which is not what you need.

Talk to an attorney about something called the Termination of Service agreement, have him sign this agreement along with the Convention Invention Assignment agreement. You'll need to compensate him some dollar amount for signing the agreement in good faith but it'll be the cleanest way to separate and vitally important moving forward.