CORRECTED - UPDATE 2-BlackBerry maker, Motorola duel in lawsuits

(Corrects date of RIM filing to Saturday)

(Adds details from lawsuits, background)

By Robert Melnbardis

MONTREAL, Feb 18 (Reuters) - BlackBerry-maker Research In Motion (RIM.TO: Quote, Profile, Research, Stock Buzz) and rival Motorola (MOT.N: Quote, Profile, Research, Stock Buzz) have sued each other over what they say are patent infringements for technology used in their mobile phones.

RIM alleges that Motorola is infringing on the Canadian company's patents and demanding "exorbitant" licensing fees, according to court documents.

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.