Reuters writes: “BlackBerry-maker Research In Motion and rival Motorola have sued each other over what they say are patent infringements for technology used in their mobile phones.”

“The civil action, filed on Saturday in U.S. District Court for the Northern District of Texas, alleges that Motorola infringed on a number of patents held by RIM.”

In addition, RIM alleges that Motorola “is demanding exorbitant royalties … for patents that Motorola claims are essential to various standards for mobile wireless telecommunications and wireless computing that RIM practices.”

“This includes technology that allows mobile telephone handset users to use Wi-Fi, RIM said. At the same time, Motorola is refusing to acknowledge or pay royalties for certain patents held by RIM, the BlackBerry-maker said.”