Can one of the patent inventors sign an agreement to obtain 50% ownership of the patent before the applicant applies for a patent?

In addition, a clause can be added to the agreement, that is, the patent is transferred within a certain period of time after the patent is granted, and the patentee is changed from one institution (because the original applicant automatically becomes the patentee after the patent is granted) to two patentees, namely institutions and enterprises. This transfer can only take effect after it is registered in the patent office. Remember.