Rocker Grace Slick is suing former bandmate PAUL KANTNER, alleging he's touring under the name JEFFERSON STARSHIP without her permission. Slick and the group's former manager Bill Thompson insist Kantner is violating trademark rights and a 1985 legal settlement he signed by performing as Jefferson Starship. They claim, under the terms of the settlement, Kantner agreed never to use the names `Jefferson' or `Airplane' without consent from Slick, the majority shareholder in Jefferson Starship Inc. Thompson tells Billboard.com the only reason Kantner hasn't been sued by himself and the WHITE RABBIT singer for continuing to tour under variations of the names is because they're "Good Samaritans." The manager says, "(Him) playing small fairs didn't irritate us so much." Thompson explains Kantner upset himself and Slick earlier this year (07) when he agreed to let Microsoft Corp. use the Starship name to promote a new product. The new suit claims Kantner has cost Thompson, Slick and Jefferson Starship Inc. more than $750,000 (GBP384,600) in revenue from using a name not rightfully his. The suit seeks to confiscate his profits and stop him from performing as Jefferson Starship.