IPO recently published its list of 2007’s 300 most prolific patentees.*  Chicago-area companies had a large presence on the list.  Here they are, along with each entity’s rank on the list:

*  Hat tip to Patent Docs for identifying the IPO’s list.

Chicago’s Most Prolific Patentees
28 Motorola (631 patents)
47 Boeing (428)
82 ITW (259)
289 Abbott (54)