Jay Walker, the founder of Priceline, is recasting himself as a patent troll in earnest: he has filed 15 lawsuits that name 100 companies, including Google, Zynga, and Sony, over their use of concepts like online scoreboards, GPS navigation, and certain banking methods.

Walker has dabbled in patent trolling before—over the last year, he's brought suits against Microsoft, Facebook, and the interstate Powerball lottery. Now, with Eric Spangenberg, CEO of the IP Navigation Group, and three other law firms at his back, Walker's company, Walker Digital, announced in a press release that it is setting out to lay claim to its rightful brain children.

The lawsuits include one against online game operators, including Activision, Valve, PopCap, and Zynga for allowing "video and computer game enthusiasts to submit their game outcomes to a central online repository so that they can be compared to the results of other players." With regard to Activision, Walker Digital specifically names Battle.net as an infringing property on this count.

Another suit claims companies including Discover and Citigroup infringe on a patent for a "method and device for generating a single-use financial account number." Yet another is going after Apple, Google, and TomTom for "making, using, importing, offering for sale and/or selling navigation instructions providing directions for traveling a route along with photographic representations of locations along a route."

Resorting to lawsuits is "not a step we sought or preferred," Jon Ellenthal, Walker Digital's CEO, said in the press release. "Unfortunately, many of these companies have refused to engage in meaningful negotiations."