Hitachi is to sue Korean rival LG over plasma patents. The brand’s Plasma Patent Licensing division has filed a lawsuit maintaining that LG has violated seven of its patents. Hitachi is seeking an injunction to prevent LG from selling plasma screens in the US. Hitachi says it has been in discussion with LG about licensing various PDP patents for some time, but as negotiations reached an impasse it had no option but to pursue LG through the courts. The suit has been filed at the US District Court of Eastern Texas. LG says that it has not violated any patents and says it continue to talk to Hitachi in order to resolve the issue.