I thought my co-founder (who never really tells me what he is working on) had made progress Discovery, will ferret this out in court and without a patent, who

I thought my co-founder (who never really tells me what he is working on) had made progress Discovery, will ferret this out in court and without a patent, who came up with the idea != an equitable consideration in the eyes of the court. If he truly has not done any or little work you may walk away with a larger stake than he is looking for. Exploitation is frowned upon in most courts.