Move on. Quick. Three non-tech founders, after 1yr no funding, patenting in early stage ... you are wasting time. Don't worry about the personal relationship.

Move on. Quick. Three non-tech founders, after 1yr no funding, patenting in early stage ... you are wasting time. Don't worry about the personal relationship. Just stay polite, try to reason your leave, why you have to move on and that you stay available for smaller Q&A. They will try to convince you to stay and to sell the big dream (that's their job) and maybe subtly pressure you by not liking you anymore. But that would be another reason to move on. Or: talk to those of the three you really like and (if your want to keep on working with them) define new rules: find a new idea to pursue, demand equal equity and setup a new company/legal entity with the desired ones.