Another suit alleging patent infringement has been filed against Research in Motion, which operates the BlackBerry wireless email system, reports the New York Times. And again there is a connection to NTP, the company that almost shut down the network last time.

Visto, a privately-held software company in Redwood Shores, Calif., decided to sue, according to the CEO, after a Texas jury ruled in its favor last week in another patent infringement case. NTP owns a stake in Visto from a deal which allowed the California company to license NTP’s wireless email patents.

This time, Visto is vowing to fight to the bitter end. “We’re not seeking a royalty, we’re seeking an injunction,” Visto’s co-founder and senior vice president, Daniel Méndez, told the paper. “Unlike NTP, we are a company with 400 employees and a viable business to protect. That’s what we’re trying to do with these actions.”

That looks to be about the only difference. The loser in the Texas case is looking for a settlement but says it has alternative technology and RIM is saying that the Visto technology is nothing to do with its system. And, of course, you can look for the latest news about this slow-moving legal fight on the little screen in your pocket.