Frequent patent defendants say they're hit by frivolous lawsuits all the time. But it's very rare for a judge to find a patent lawsuit to be frivolous enough to grant sanctions and attorney's fees.
It happened last week in Peoria, Illinois. A company called Triune Star owns patent 6,122,521, which covers a camera with a GPS locator in it. But it only covers infrared cameras, a limitiation that the patent examiner insisted on adding in order to grant a patent. Patent was granted in 2000, and lawsuit was filed in September 2007 against telephone manufacturers LG Electronics and Pantech, as well as Disney, which partnered with them to sell "family phones" with GPS locators that parents could use to track their kids. The service ran from mid-2006 to end of 2007 before it was shut down.