Google Inc faces a federal patent infringement lawsuit by Northeastern University over technology used in its core Web search system, according to legal papers filed last week. The complaint was filed on Nov. 6 in Marshall, in the Eastern District of Texas -- the U.S. court with a history of decisions that are highly favorable to plaintiffs in patent cases -- but the case only came to light over the weekend.

The plaintiffs are Boston-based Northeastern University and Jarg Corp, a start-up founded by a Northeastern University professor that is the exclusive licensee of search technology patented in 1997, a year before Google was incorporated.

A spokesman for Mountain View, California-based Google said it believed the suit was without merit.

"While we have not been served, we are aware of the complaint and believe it to be without merit based upon our initial investigation," Google spokesman Jon Murchison said.

The leading Internet company derives 99 percent of its revenue from online advertising, which is delivered in response to keyword searches Google users perform to find Web links.

Michael Belanger, president and co-founder of Jarg, said in a phone interview that his company had become aware of the infringement several years ago, but lacked the resources to press its case until it found a law firm willing to fund the case on a contingency-fee basis. Northeastern then signed on.

The plaintiffs' attorneys are from the Texas-based global law firm of Vinson & Elkins, which is paying the costs of the case, assisted by local counsel in Marshall and nearby Tyler.