I am about to conclude my Ph.D. work. The research has led to a possible commercial product which I always pushed. So now, after four years of work, we've filed four patents with three already granted. A year and a half ago, the PI moved to another position, so now I communicate my progess once a month).
I developed the scientific product along with software, electronic hardware, web apps, and so on, not to mention journal papers on the way. The technology is promising and we have businesses interested and willing to invest. Along the way we got a part-time master's business student, who supports us when we have to write proposals and do interview calls and meeting possible business leads. I always join those meetings and often take decision on what should be the way and what is achievable.
Now we are on the verge of legally founding the company and possibly soon begin sales.
My dilemma is finding out what share of the company is fair for me.
The partners in the business would be me, the business student, and my PI. (I think the PI should get a fair share; after all, it was research done in her lab, however I have seen opinions saying this should be no more than 10 percent.)
Of course, on the way, there were master's student with whom I worked and taught them the lab work and tricks and all that I could to have them their work done in timely manner, also I offered them opportunity to be part of startup but they were not interested.
I don't want it to be a quarrel but also don't want to feel exploited. If I leave there is no one on the team who understands how the technology works, or how we can produce with alternative methods (I might be overestimating, but this stuff I did for my PhD and mostly it would be another PhD who could do it. It is countless hours of labwork.) I am a co-inventor along with PI on all the patents filed/granted.
Please help me out in figuring what share of the company I should expect.