3M sues Purell maker over foaming patent

Maplewood-based 3M said the maker of Purell hand sanitizer needs to come clean about the 3M invention used in its foaming products. In a civil lawsuit filed in federal court, 3M accuses GOJO Industries Inc. of violating a 3M patent for the foaming, antimicrobial sanitizer. 3M's suit claims that GOJO - which owns the Purell brand - uses 3M's work in certain formulations of Purell Instant...