Note that last ranking was based on the number of IP lawyers in the firm. And I'm not sure how up to date those numbers today.

What about rankings based on total revenues, new cases, wins vs losses, % of settlements etc etc

Patents

Duane Morris is recognized as one of the United States' most-active law firms in terms of patent filing and protection. National publications Intellectual Property Today, IP Law & Business, IP Law Bulletin and IP Law360 have all ranked Duane Morris among the leading law firms handling patents and patent-related litigation.