You don't actually have to build something to file a patent. You just imagine what it might look like. You can do that pretty quickly.

A patent is a finite time period monopoly on the use/practice/sale of an invention. To innovate means to introduce something new. The two concepts aren't the same. E.g. You can patent something economically useless, you can patent something and not build it. As a practical matter its not clear to me if you can or should require patents to be linked to innovations.