Using a limited but effective discovery plan, Carlson Caspers won a very favorable Markman ruling in this dispute related to several 3M patents covering disposable respirators with exhalation valves. 552 F. Supp. 2d 921 (D. Minn. 2008). Carlson Caspers also won summary judgment in 3M’s favor on the defendant’s counterclaim of patent unenforceability. 2008 US Dist LEXIS 60842 (D. Minn. Aug. 8, 2008). The case settled favorably to 3M soon thereafter.