ST. PAUL, Minn.--(BUSINESS WIRE)--As part of its ongoing program to license to the dental industry 3M\'s patented technology that enables the coloring of ceramic-based dental restorations, and to protect its technology against unlicensed users, 3M has filed a patent infringement lawsuit in Düsseldorf, Germany against Dental Direkt GmbH located in Spenge, Germany. The lawsuit alleges infringement of 3M’s patent rights by Dental Direkt’s zirconia CAD/CAM blocks sold under the brand “DD Bio Z” and
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