Research In Motion Strikes Back

The company countersues in its latest patent wrangle.
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Research In Motion

(RIMM)

is hitting back at

Visto

, its smaller wireless email rival that filed a patent suit against the BlackBerry maker on Friday.

RIM has filed its own suit against Visto in U.S. District Court, seeking to have three of the smaller company's patents invalidated, according to the

The Wall Street Journal

. In its own suit against RIM, Visto charged that RIM was violating its patents on technology related to synchronization and security in wireless email systems.

Representatives for RIM and Visto were not immediately available for comment.

RIM filed its lawsuit in a different venue than did Visto, which sued RIM in the U.S. District Court for the Eastern District of Texas, based in Marshall. RIM sued Visto in Dallas in the U.S. District Court for the Northern District of Texas.

The dispute between RIM and Visto comes just two months after RIM settled an earlier patent suit filed by NTP. RIM paid $612.5 million to settle that dispute. NTP, a patent holding company, has a small stake in Visto.

Shares of RIM closed Wednesday up 49 cents, or less than 1%, to $74.93.