I don't know of a university policy.  From my personal experience, I have had
one such contract.  The PI wanted to make it work and the company would not
back down (actually, the lawyers wouldn't back down!) so the PI changed the
statement of work so that it was so specific, it would not prohibit future
or related work.

Ruth Tallman
Office of Research and Sponsored Programs
Lehigh University
526 Brodhead Ave.
Bethlehem, PA  18015
Phone: 610-758-3024
E-Mail: xxxxxx@lehigh.edu