SAN FRANCISCO — One Fish, two Fish. One Fish, sue Fish?

Irvine, California-based intellectual property boutique Fish IP Law has sued Fish & Richardson, seeking a ruling that its name and logo don't infringe the IP megafirm's trademarks.

The lawsuit, filed Sept. 15 in the U.S. District Court for the Northern District of California, followed tense correspondence between the two IP-centric firms over the past month after the smaller firm tweaked its name.