It`s a great time to be a patent attorney. Just ask Research In Motion (Nasdaq: RIMM), which had to pay out $612 million in a time-consuming patent battle with NTP -- a company that hires attorneys to litigate patents.

RIM, on the other hand, develops and distributes real and very useful products. Its flagship Blackberry is a ``must have`` for many professionals.

Just when it looked like RIM was clear of major patent litigation, the company has now been hit with another lawsuit. The new plaintiff, Visto, claims that RIM is violating four of its patents. As a result, it wants unspecified damages and an injunction in the U.S.