1 patent is the biggest capital of your company, and you should get 1/3 shares. Your shares are incomplete. I suggest you apply for a patent after the finished product, and then start a company ~
You are not a designer, but you are the founder of R&D, and you have the right to apply for a patent for your R&D achievements. However, you should sign an agreement with R&D personnel before R&D and compensate them for their losses in this respect. Even if you sell it to others, you can only get black money. Once found out, you can sue them for infringement, compensate you for the loss of interests and bear criminal responsibility!
Everything will be pirated. If you want to keep the interests, you have to occupy the market before they come out, and then constantly update and innovate to keep your brand's market position ~ there is no eternal interest, only eternal innovation, otherwise how can there be so many brands in a thing on the market?
Finally, it is important to find someone to cooperate with. You should see clearly and know your partner, otherwise, your biggest opponent is your future partner.