Wireless email vendor Visto took aim Tuesday at a fellow rival to Research In Motion, filing <A HREF="http://news.zdnet.com/2100-1040_22-6033319.html?tag=zdnn.alert">a patent infringement lawsuit</A> against Good Technology. Visto and Good Technology are two of several companies looking to capitalize on the legal problems of RIM, which could see its popular BlackBerry service shut down from its own patent spat with NTP. Visto is charging that Good Technology's products infringe on four patents it holds for sending data wirelessly over a network. The company is seeking a permanent injunction against the GoodLink software that runs Good's system, the same remedy sought by NTP against RIM's wireless software and services.