Microsoft filed suit on Monday against Barnes & Noble, as well as the makers of its Android-based e-reader and tablet devices, for patent infringement, part of its broader campaign against Google’s mobile operating system.

The software giant alleges its patents cover a range of functions “essential to the user experience”. The company specifically cites the way users tab through various screens on the Nook e-reader and the Nook Color tablet, both of which run Android, to find the information they’re after, as well as the way they interact with documents and e-books.

“The Android platform infringes a number of Microsoft’s patents, and companies manufacturing and shipping Android devices must respect our intellectual property rights,” said Horacio Gutiérrez, Microsoft’s corporate VP and deputy general counsel for intellectual property and licensing, in a press release.