Before your startup signs that joint development agreement with a big corporation, be sure to file proper patent applications.
After the agreement is signed, there is only a “collective you”, so now is the time to document your ownership of the IP that you will bring into the project.
PS: This thought got a good amount of traction on LinkedIn. One commenter rightly added that it’s very important to define in the development agreement what happens with the IP generated within the project. He said “Make i.a. sure that you have access to this IP to be able to market your products (and not to be blocked) in the area of business that is important to your company.”