Microsoft broadened its attack on Google’s Android software, filing patent infringement lawsuits Monday against Barnes & Noble and two manufacturers over the Android-based Nook e-reader.

In the complaint filed in U.S. District Court in Seattle, Microsoft said it is seeking triple damages based on willful patent infringement of five patents, plus legal costs and an injunction against further infringement. Microsoft said it also filed a complaint with the International Trade Commission, which has the power to bar imports of infringing products.